/* $NetBSD: pcap.c,v 1.11 2023/08/17 15:18:12 christos Exp $ */ /* * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the Computer Systems * Engineering Group at Lawrence Berkeley Laboratory. * 4. Neither the name of the University nor of the Laboratory may be used * to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __RCSID("$NetBSD: pcap.c,v 1.11 2023/08/17 15:18:12 christos Exp $"); #ifdef HAVE_CONFIG_H #include #endif #include #ifndef _WIN32 #include #ifndef MSDOS #include #endif #include #include #ifdef HAVE_SYS_SOCKIO_H #include #endif struct mbuf; /* Squelch compiler warnings on some platforms for */ struct rtentry; /* declarations in */ #include #include #endif /* _WIN32 */ #include #include #include #if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__MINGW32__) #include #endif #include #include #include #include "diag-control.h" #ifdef HAVE_OS_PROTO_H #include "os-proto.h" #endif #ifdef MSDOS #include "pcap-dos.h" #endif #include "pcap-int.h" #include "optimize.h" #ifdef HAVE_DAG_API #include "pcap-dag.h" #endif /* HAVE_DAG_API */ #ifdef HAVE_SEPTEL_API #include "pcap-septel.h" #endif /* HAVE_SEPTEL_API */ #ifdef HAVE_SNF_API #include "pcap-snf.h" #endif /* HAVE_SNF_API */ #ifdef HAVE_TC_API #include "pcap-tc.h" #endif /* HAVE_TC_API */ #ifdef PCAP_SUPPORT_LINUX_USBMON #include "pcap-usb-linux.h" #endif #ifdef PCAP_SUPPORT_BT #include "pcap-bt-linux.h" #endif #ifdef PCAP_SUPPORT_BT_MONITOR #include "pcap-bt-monitor-linux.h" #endif #ifdef PCAP_SUPPORT_NETFILTER #include "pcap-netfilter-linux.h" #endif #ifdef PCAP_SUPPORT_NETMAP #include "pcap-netmap.h" #endif #ifdef PCAP_SUPPORT_DBUS #include "pcap-dbus.h" #endif #ifdef PCAP_SUPPORT_RPCAP #include "pcap-rpcap-unix.h" #endif #ifdef PCAP_SUPPORT_RDMASNIFF #include "pcap-rdmasniff.h" #endif #ifdef PCAP_SUPPORT_DPDK #include "pcap-dpdk.h" #endif #ifdef HAVE_AIRPCAP_API #include "pcap-airpcap.h" #endif #ifdef _WIN32 /* * To quote the WSAStartup() documentation: * * The WSAStartup function typically leads to protocol-specific helper * DLLs being loaded. As a result, the WSAStartup function should not * be called from the DllMain function in a application DLL. This can * potentially cause deadlocks. * * and the WSACleanup() documentation: * * The WSACleanup function typically leads to protocol-specific helper * DLLs being unloaded. As a result, the WSACleanup function should not * be called from the DllMain function in a application DLL. This can * potentially cause deadlocks. * * So we don't initialize Winsock in a DllMain() routine. * * pcap_init() should be called to initialize pcap on both UN*X and * Windows; it will initialize Winsock on Windows. (It will also be * initialized as needed if pcap_init() hasn't been called.) */ /* * Start Winsock. * Internal routine. */ static int internal_wsockinit(char *errbuf) { WORD wVersionRequested; WSADATA wsaData; static int err = -1; static int done = 0; int status; if (done) return (err); /* * Versions of Windows that don't support Winsock 2.2 are * too old for us. */ wVersionRequested = MAKEWORD(2, 2); status = WSAStartup(wVersionRequested, &wsaData); done = 1; if (status != 0) { if (errbuf != NULL) { pcap_fmt_errmsg_for_win32_err(errbuf, PCAP_ERRBUF_SIZE, status, "WSAStartup() failed"); } return (err); } atexit ((void(*)(void))WSACleanup); err = 0; return (err); } /* * Exported in case some applications using WinPcap/Npcap called it, * even though it wasn't exported. */ int wsockinit(void) { return (internal_wsockinit(NULL)); } /* * This is the exported function; new programs should call this. * *Newer* programs should call pcap_init(). */ int pcap_wsockinit(void) { return (internal_wsockinit(NULL)); } #endif /* _WIN32 */ /* * Do whatever initialization is needed for libpcap. * * The argument specifies whether we use the local code page or UTF-8 * for strings; on UN*X, we just assume UTF-8 in places where the encoding * would matter, whereas, on Windows, we use the local code page for * PCAP_CHAR_ENC_LOCAL and UTF-8 for PCAP_CHAR_ENC_UTF_8. * * On Windows, we also disable the hack in pcap_create() to deal with * being handed UTF-16 strings, because if the user calls this they're * explicitly declaring that they will either be passing local code * page strings or UTF-8 strings, so we don't need to allow UTF-16LE * strings to be passed. For good measure, on Windows *and* UN*X, * we disable pcap_lookupdev(), to prevent anybody from even * *trying* to pass the result of pcap_lookupdev() - which might be * UTF-16LE on Windows, for ugly compatibility reasons - to pcap_create() * or pcap_open_live() or pcap_open(). * * Returns 0 on success, -1 on error. */ int pcap_new_api; /* pcap_lookupdev() always fails */ int pcap_utf_8_mode; /* Strings should be in UTF-8. */ int pcap_init(unsigned int opts, char *errbuf) { static int initialized; /* * Don't allow multiple calls that set different modes; that * may mean a library is initializing pcap in one mode and * a program using that library, or another library used by * that program, is initializing it in another mode. */ switch (opts) { case PCAP_CHAR_ENC_LOCAL: /* Leave "UTF-8 mode" off. */ if (initialized) { if (pcap_utf_8_mode) { snprintf(errbuf, PCAP_ERRBUF_SIZE, "Multiple pcap_init calls with different character encodings"); return (PCAP_ERROR); } } break; case PCAP_CHAR_ENC_UTF_8: /* Turn on "UTF-8 mode". */ if (initialized) { if (!pcap_utf_8_mode) { snprintf(errbuf, PCAP_ERRBUF_SIZE, "Multiple pcap_init calls with different character encodings"); return (PCAP_ERROR); } } pcap_utf_8_mode = 1; break; default: snprintf(errbuf, PCAP_ERRBUF_SIZE, "Unknown options specified"); return (PCAP_ERROR); } /* * Turn the appropriate mode on for error messages; those routines * are also used in rpcapd, which has no access to pcap's internal * UTF-8 mode flag, so we have to call a routine to set its * UTF-8 mode flag. */ pcap_fmt_set_encoding(opts); if (initialized) { /* * Nothing more to do; for example, on Windows, we've * already initialized Winsock. */ return (0); } #ifdef _WIN32 /* * Now set up Winsock. */ if (internal_wsockinit(errbuf) == -1) { /* Failed. */ return (PCAP_ERROR); } #endif /* * We're done. */ initialized = 1; pcap_new_api = 1; return (0); } /* * String containing the library version. * Not explicitly exported via a header file - the right API to use * is pcap_lib_version() - but some programs included it, so we * provide it. * * We declare it here, right before defining it, to squelch any * warnings we might get from compilers about the lack of a * declaration. */ PCAP_API char pcap_version[]; PCAP_API_DEF char pcap_version[] = PACKAGE_VERSION; static void pcap_set_not_initialized_message(pcap_t *pcap) { if (pcap->activated) { /* A module probably forgot to set the function pointer */ (void)snprintf(pcap->errbuf, sizeof(pcap->errbuf), "This operation isn't properly handled by that device"); return; } /* in case the caller doesn't check for PCAP_ERROR_NOT_ACTIVATED */ (void)snprintf(pcap->errbuf, sizeof(pcap->errbuf), "This handle hasn't been activated yet"); } static int pcap_read_not_initialized(pcap_t *pcap, int cnt _U_, pcap_handler callback _U_, u_char *user _U_) { pcap_set_not_initialized_message(pcap); /* this means 'not initialized' */ return (PCAP_ERROR_NOT_ACTIVATED); } static int pcap_inject_not_initialized(pcap_t *pcap, const void * buf _U_, size_t size _U_) { pcap_set_not_initialized_message(pcap); /* this means 'not initialized' */ return (PCAP_ERROR_NOT_ACTIVATED); } static int pcap_setfilter_not_initialized(pcap_t *pcap, struct bpf_program *fp _U_) { pcap_set_not_initialized_message(pcap); /* this means 'not initialized' */ return (PCAP_ERROR_NOT_ACTIVATED); } static int pcap_setdirection_not_initialized(pcap_t *pcap, pcap_direction_t d _U_) { pcap_set_not_initialized_message(pcap); /* this means 'not initialized' */ return (PCAP_ERROR_NOT_ACTIVATED); } static int pcap_set_datalink_not_initialized(pcap_t *pcap, int dlt _U_) { pcap_set_not_initialized_message(pcap); /* this means 'not initialized' */ return (PCAP_ERROR_NOT_ACTIVATED); } static int pcap_getnonblock_not_initialized(pcap_t *pcap) { pcap_set_not_initialized_message(pcap); /* this means 'not initialized' */ return (PCAP_ERROR_NOT_ACTIVATED); } static int pcap_stats_not_initialized(pcap_t *pcap, struct pcap_stat *ps _U_) { pcap_set_not_initialized_message(pcap); /* this means 'not initialized' */ return (PCAP_ERROR_NOT_ACTIVATED); } #ifdef _WIN32 static struct pcap_stat * pcap_stats_ex_not_initialized(pcap_t *pcap, int *pcap_stat_size _U_) { pcap_set_not_initialized_message(pcap); return (NULL); } static int pcap_setbuff_not_initialized(pcap_t *pcap, int dim _U_) { pcap_set_not_initialized_message(pcap); /* this means 'not initialized' */ return (PCAP_ERROR_NOT_ACTIVATED); } static int pcap_setmode_not_initialized(pcap_t *pcap, int mode _U_) { pcap_set_not_initialized_message(pcap); /* this means 'not initialized' */ return (PCAP_ERROR_NOT_ACTIVATED); } static int pcap_setmintocopy_not_initialized(pcap_t *pcap, int size _U_) { pcap_set_not_initialized_message(pcap); /* this means 'not initialized' */ return (PCAP_ERROR_NOT_ACTIVATED); } static HANDLE pcap_getevent_not_initialized(pcap_t *pcap) { pcap_set_not_initialized_message(pcap); return (INVALID_HANDLE_VALUE); } static int pcap_oid_get_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_, void *data _U_, size_t *lenp _U_) { pcap_set_not_initialized_message(pcap); return (PCAP_ERROR_NOT_ACTIVATED); } static int pcap_oid_set_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_, const void *data _U_, size_t *lenp _U_) { pcap_set_not_initialized_message(pcap); return (PCAP_ERROR_NOT_ACTIVATED); } static u_int pcap_sendqueue_transmit_not_initialized(pcap_t *pcap, pcap_send_queue* queue _U_, int sync _U_) { pcap_set_not_initialized_message(pcap); return (0); } static int pcap_setuserbuffer_not_initialized(pcap_t *pcap, int size _U_) { pcap_set_not_initialized_message(pcap); return (PCAP_ERROR_NOT_ACTIVATED); } static int pcap_live_dump_not_initialized(pcap_t *pcap, char *filename _U_, int maxsize _U_, int maxpacks _U_) { pcap_set_not_initialized_message(pcap); return (PCAP_ERROR_NOT_ACTIVATED); } static int pcap_live_dump_ended_not_initialized(pcap_t *pcap, int sync _U_) { pcap_set_not_initialized_message(pcap); return (PCAP_ERROR_NOT_ACTIVATED); } static PAirpcapHandle pcap_get_airpcap_handle_not_initialized(pcap_t *pcap) { pcap_set_not_initialized_message(pcap); return (NULL); } #endif /* * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't, * a PCAP_ERROR value on an error. */ int pcap_can_set_rfmon(pcap_t *p) { return (p->can_set_rfmon_op(p)); } /* * For systems where rfmon mode is never supported. */ static int pcap_cant_set_rfmon(pcap_t *p _U_) { return (0); } /* * Sets *tstamp_typesp to point to an array 1 or more supported time stamp * types; the return value is the number of supported time stamp types. * The list should be freed by a call to pcap_free_tstamp_types() when * you're done with it. * * A return value of 0 means "you don't get a choice of time stamp type", * in which case *tstamp_typesp is set to null. * * PCAP_ERROR is returned on error. */ int pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp) { if (p->tstamp_type_count == 0) { /* * We don't support multiple time stamp types. * That means the only type we support is PCAP_TSTAMP_HOST; * set up a list containing only that type. */ *tstamp_typesp = (int*)malloc(sizeof(**tstamp_typesp)); if (*tstamp_typesp == NULL) { pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), errno, "malloc"); return (PCAP_ERROR); } **tstamp_typesp = PCAP_TSTAMP_HOST; return (1); } else { *tstamp_typesp = (int*)calloc(sizeof(**tstamp_typesp), p->tstamp_type_count); if (*tstamp_typesp == NULL) { pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), errno, "malloc"); return (PCAP_ERROR); } (void)memcpy(*tstamp_typesp, p->tstamp_type_list, sizeof(**tstamp_typesp) * p->tstamp_type_count); return (p->tstamp_type_count); } } /* * In Windows, you might have a library built with one version of the * C runtime library and an application built with another version of * the C runtime library, which means that the library might use one * version of malloc() and free() and the application might use another * version of malloc() and free(). If so, that means something * allocated by the library cannot be freed by the application, so we * need to have a pcap_free_tstamp_types() routine to free up the list * allocated by pcap_list_tstamp_types(), even though it's just a wrapper * around free(). */ void pcap_free_tstamp_types(int *tstamp_type_list) { free(tstamp_type_list); } /* * Default one-shot callback; overridden for capture types where the * packet data cannot be guaranteed to be available after the callback * returns, so that a copy must be made. */ void pcap_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *pkt) { struct oneshot_userdata *sp = (struct oneshot_userdata *)user; *sp->hdr = *h; *sp->pkt = pkt; } const u_char * pcap_next(pcap_t *p, struct pcap_pkthdr *h) { struct oneshot_userdata s; const u_char *pkt; s.hdr = h; s.pkt = &pkt; s.pd = p; if (pcap_dispatch(p, 1, p->oneshot_callback, (u_char *)&s) <= 0) return (0); return (pkt); } int pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header, const u_char **pkt_data) { struct oneshot_userdata s; s.hdr = &p->pcap_header; s.pkt = pkt_data; s.pd = p; /* Saves a pointer to the packet headers */ *pkt_header= &p->pcap_header; if (p->rfile != NULL) { int status; /* We are on an offline capture */ status = pcap_offline_read(p, 1, p->oneshot_callback, (u_char *)&s); /* * Return codes for pcap_offline_read() are: * - 0: EOF * - -1: error * - >0: OK - result is number of packets read, so * it will be 1 in this case, as we've passed * a maximum packet count of 1 * The first one ('0') conflicts with the return code of * 0 from pcap_read() meaning "no packets arrived before * the timeout expired", so we map it to -2 so you can * distinguish between an EOF from a savefile and a * "no packets arrived before the timeout expired, try * again" from a live capture. */ if (status == 0) return (-2); else return (status); } /* * Return codes for pcap_read() are: * - 0: timeout * - -1: error * - -2: loop was broken out of with pcap_breakloop() * - >0: OK, result is number of packets captured, so * it will be 1 in this case, as we've passed * a maximum packet count of 1 * The first one ('0') conflicts with the return code of 0 from * pcap_offline_read() meaning "end of file". */ return (p->read_op(p, 1, p->oneshot_callback, (u_char *)&s)); } /* * Implementation of a pcap_if_list_t. */ struct pcap_if_list { pcap_if_t *beginning; }; static struct capture_source_type { int (*findalldevs_op)(pcap_if_list_t *, char *); pcap_t *(*create_op)(const char *, char *, int *); } capture_source_types[] = { #ifdef HAVE_DAG_API { dag_findalldevs, dag_create }, #endif #ifdef HAVE_SEPTEL_API { septel_findalldevs, septel_create }, #endif #ifdef HAVE_SNF_API { snf_findalldevs, snf_create }, #endif #ifdef HAVE_TC_API { TcFindAllDevs, TcCreate }, #endif #ifdef PCAP_SUPPORT_BT { bt_findalldevs, bt_create }, #endif #ifdef PCAP_SUPPORT_BT_MONITOR { bt_monitor_findalldevs, bt_monitor_create }, #endif #ifdef PCAP_SUPPORT_LINUX_USBMON { usb_findalldevs, usb_create }, #endif #ifdef PCAP_SUPPORT_NETFILTER { netfilter_findalldevs, netfilter_create }, #endif #ifdef PCAP_SUPPORT_NETMAP { pcap_netmap_findalldevs, pcap_netmap_create }, #endif #ifdef PCAP_SUPPORT_DBUS { dbus_findalldevs, dbus_create }, #endif #ifdef PCAP_SUPPORT_RDMASNIFF { rdmasniff_findalldevs, rdmasniff_create }, #endif #ifdef PCAP_SUPPORT_DPDK { pcap_dpdk_findalldevs, pcap_dpdk_create }, #endif #ifdef HAVE_AIRPCAP_API { airpcap_findalldevs, airpcap_create }, #endif { NULL, NULL } }; /* * Get a list of all capture sources that are up and that we can open. * Returns -1 on error, 0 otherwise. * The list, as returned through "alldevsp", may be null if no interfaces * were up and could be opened. */ int pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf) { size_t i; pcap_if_list_t devlist; /* * Find all the local network interfaces on which we * can capture. */ devlist.beginning = NULL; if (pcap_platform_finddevs(&devlist, errbuf) == -1) { /* * Failed - free all of the entries we were given * before we failed. */ if (devlist.beginning != NULL) pcap_freealldevs(devlist.beginning); *alldevsp = NULL; return (-1); } /* * Ask each of the non-local-network-interface capture * source types what interfaces they have. */ for (i = 0; capture_source_types[i].findalldevs_op != NULL; i++) { if (capture_source_types[i].findalldevs_op(&devlist, errbuf) == -1) { /* * We had an error; free the list we've been * constructing. */ if (devlist.beginning != NULL) pcap_freealldevs(devlist.beginning); *alldevsp = NULL; return (-1); } } /* * Return the first entry of the list of all devices. */ *alldevsp = devlist.beginning; return (0); } static struct sockaddr * dup_sockaddr(struct sockaddr *sa, size_t sa_length) { struct sockaddr *newsa; if ((newsa = malloc(sa_length)) == NULL) return (NULL); return (memcpy(newsa, sa, sa_length)); } /* * Construct a "figure of merit" for an interface, for use when sorting * the list of interfaces, in which interfaces that are up are superior * to interfaces that aren't up, interfaces that are up and running are * superior to interfaces that are up but not running, and non-loopback * interfaces that are up and running are superior to loopback interfaces, * and interfaces with the same flags have a figure of merit that's higher * the lower the instance number. * * The goal is to try to put the interfaces most likely to be useful for * capture at the beginning of the list. * * The figure of merit, which is lower the "better" the interface is, * has the uppermost bit set if the interface isn't running, the bit * below that set if the interface isn't up, the bit below that * set if the interface is a loopback interface, and the bit below * that set if it's the "any" interface. * * Note: we don't sort by unit number because 1) not all interfaces have * a unit number (systemd, for example, might assign interface names * based on the interface's MAC address or on the physical location of * the adapter's connector), and 2) if the name does end with a simple * unit number, it's not a global property of the interface, it's only * useful as a sort key for device names with the same prefix, so xyz0 * shouldn't necessarily sort before abc2. This means that interfaces * with the same figure of merit will be sorted by the order in which * the mechanism from which we're getting the interfaces supplies them. */ static u_int get_figure_of_merit(pcap_if_t *dev) { u_int n; n = 0; if (!(dev->flags & PCAP_IF_RUNNING)) n |= 0x80000000; if (!(dev->flags & PCAP_IF_UP)) n |= 0x40000000; /* * Give non-wireless interfaces that aren't disconnected a better * figure of merit than interfaces that are disconnected, as * "disconnected" should indicate that the interface isn't * plugged into a network and thus won't give you any traffic. * * For wireless interfaces, it means "associated with a network", * which we presume not to necessarily prevent capture, as you * might run the adapter in some flavor of monitor mode. */ if (!(dev->flags & PCAP_IF_WIRELESS) && (dev->flags & PCAP_IF_CONNECTION_STATUS) == PCAP_IF_CONNECTION_STATUS_DISCONNECTED) n |= 0x20000000; /* * Sort loopback devices after non-loopback devices, *except* for * disconnected devices. */ if (dev->flags & PCAP_IF_LOOPBACK) n |= 0x10000000; /* * Sort the "any" device before loopback and disconnected devices, * but after all other devices. */ if (strcmp(dev->name, "any") == 0) n |= 0x08000000; return (n); } #ifndef _WIN32 /* * Try to get a description for a given device. * Returns a mallocated description if it could and NULL if it couldn't. * * XXX - on FreeBSDs that support it, should it get the sysctl named * "dev.{adapter family name}.{adapter unit}.%desc" to get a description * of the adapter? Note that "dev.an.0.%desc" is "Aironet PC4500/PC4800" * with my Cisco 350 card, so the name isn't entirely descriptive. The * "dev.an.0.%pnpinfo" has a better description, although one might argue * that the problem is really a driver bug - if it can find out that it's * a Cisco 340 or 350, rather than an old Aironet card, it should use * that in the description. * * Do NetBSD, DragonflyBSD, or OpenBSD support this as well? FreeBSD * and OpenBSD let you get a description, but it's not generated by the OS, * it's set with another ioctl that ifconfig supports; we use that to get * a description in FreeBSD and OpenBSD, but if there is no such * description available, it still might be nice to get some description * string based on the device type or something such as that. * * In macOS, the System Configuration framework can apparently return * names in 10.4 and later. * * It also appears that freedesktop.org's HAL offers an "info.product" * string, but the HAL specification says it "should not be used in any * UI" and "subsystem/capability specific properties" should be used * instead and, in any case, I think HAL is being deprecated in * favor of other stuff such as DeviceKit. DeviceKit doesn't appear * to have any obvious product information for devices, but maybe * I haven't looked hard enough. * * Using the System Configuration framework, or HAL, or DeviceKit, or * whatever, would require that libpcap applications be linked with * the frameworks/libraries in question. That shouldn't be a problem * for programs linking with the shared version of libpcap (unless * you're running on AIX - which I think is the only UN*X that doesn't * support linking a shared library with other libraries on which it * depends, and having an executable linked only with the first shared * library automatically pick up the other libraries when started - * and using HAL or whatever). Programs linked with the static * version of libpcap would have to use pcap-config with the --static * flag in order to get the right linker flags in order to pick up * the additional libraries/frameworks; those programs need that anyway * for libpcap 1.1 and beyond on Linux, as, by default, it requires * -lnl. * * Do any other UN*Xes, or desktop environments support getting a * description? */ static char * #ifdef SIOCGIFDESCR get_if_description(const char *name) { char *description = NULL; int s; struct ifreq ifrdesc; #ifndef IFDESCRSIZE size_t descrlen = 64; #else size_t descrlen = IFDESCRSIZE; #endif /* IFDESCRSIZE */ /* * Get the description for the interface. */ memset(&ifrdesc, 0, sizeof ifrdesc); pcap_strlcpy(ifrdesc.ifr_name, name, sizeof ifrdesc.ifr_name); s = socket(AF_INET, SOCK_DGRAM, 0); if (s >= 0) { #ifdef __FreeBSD__ /* * On FreeBSD, if the buffer isn't big enough for the * description, the ioctl succeeds, but the description * isn't copied, ifr_buffer.length is set to the description * length, and ifr_buffer.buffer is set to NULL. */ for (;;) { free(description); if ((description = malloc(descrlen)) != NULL) { ifrdesc.ifr_buffer.buffer = description; ifrdesc.ifr_buffer.length = descrlen; if (ioctl(s, SIOCGIFDESCR, &ifrdesc) == 0) { if (ifrdesc.ifr_buffer.buffer == description) break; else descrlen = ifrdesc.ifr_buffer.length; } else { /* * Failed to get interface description. */ free(description); description = NULL; break; } } else break; } #else /* __FreeBSD__ */ /* * The only other OS that currently supports * SIOCGIFDESCR is OpenBSD, and it has no way * to get the description length - it's clamped * to a maximum of IFDESCRSIZE. */ if ((description = malloc(descrlen)) != NULL) { ifrdesc.ifr_data = (caddr_t)description; if (ioctl(s, SIOCGIFDESCR, &ifrdesc) != 0) { /* * Failed to get interface description. */ free(description); description = NULL; } } #endif /* __FreeBSD__ */ close(s); if (description != NULL && description[0] == '\0') { /* * Description is empty, so discard it. */ free(description); description = NULL; } } #ifdef __FreeBSD__ /* * For FreeBSD, if we didn't get a description, and this is * a device with a name of the form usbusN, label it as a USB * bus. */ if (description == NULL) { if (strncmp(name, "usbus", 5) == 0) { /* * OK, it begins with "usbus". */ long busnum; char *p; errno = 0; busnum = strtol(name + 5, &p, 10); if (errno == 0 && p != name + 5 && *p == '\0' && busnum >= 0 && busnum <= INT_MAX) { /* * OK, it's a valid number that's not * bigger than INT_MAX. Construct * a description from it. * (If that fails, we don't worry about * it, we just return NULL.) */ if (pcap_asprintf(&description, "USB bus number %ld", busnum) == -1) { /* Failed. */ description = NULL; } } } } #endif return (description); #else /* SIOCGIFDESCR */ get_if_description(const char *name _U_) { return (NULL); #endif /* SIOCGIFDESCR */ } /* * Look for a given device in the specified list of devices. * * If we find it, return a pointer to its entry. * * If we don't find it, attempt to add an entry for it, with the specified * IFF_ flags and description, and, if that succeeds, return a pointer to * the new entry, otherwise return NULL and set errbuf to an error message. */ pcap_if_t * find_or_add_if(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 if_flags, get_if_flags_func get_flags_func, char *errbuf) { bpf_u_int32 pcap_flags; /* * Convert IFF_ flags to pcap flags. */ pcap_flags = 0; #ifdef IFF_LOOPBACK if (if_flags & IFF_LOOPBACK) pcap_flags |= PCAP_IF_LOOPBACK; #else /* * We don't have IFF_LOOPBACK, so look at the device name to * see if it looks like a loopback device. */ if (name[0] == 'l' && name[1] == 'o' && (PCAP_ISDIGIT(name[2]) || name[2] == '\0')) pcap_flags |= PCAP_IF_LOOPBACK; #endif #ifdef IFF_UP if (if_flags & IFF_UP) pcap_flags |= PCAP_IF_UP; #endif #ifdef IFF_RUNNING if (if_flags & IFF_RUNNING) pcap_flags |= PCAP_IF_RUNNING; #endif /* * Attempt to find an entry for this device; if we don't find one, * attempt to add one. */ return (find_or_add_dev(devlistp, name, pcap_flags, get_flags_func, get_if_description(name), errbuf)); } /* * Look for a given device in the specified list of devices. * * If we find it, then, if the specified address isn't null, add it to * the list of addresses for the device and return 0. * * If we don't find it, attempt to add an entry for it, with the specified * IFF_ flags and description, and, if that succeeds, add the specified * address to its list of addresses if that address is non-null, and * return 0, otherwise return -1 and set errbuf to an error message. * * (We can get called with a null address because we might get a list * of interface name/address combinations from the underlying OS, with * the address being absent in some cases, rather than a list of * interfaces with each interface having a list of addresses, so this * call may be the only call made to add to the list, and we want to * add interfaces even if they have no addresses.) */ int add_addr_to_if(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 if_flags, get_if_flags_func get_flags_func, struct sockaddr *addr, size_t addr_size, struct sockaddr *netmask, size_t netmask_size, struct sockaddr *broadaddr, size_t broadaddr_size, struct sockaddr *dstaddr, size_t dstaddr_size, char *errbuf) { pcap_if_t *curdev; /* * Check whether the device exists and, if not, add it. */ curdev = find_or_add_if(devlistp, name, if_flags, get_flags_func, errbuf); if (curdev == NULL) { /* * Error - give up. */ return (-1); } if (addr == NULL) { /* * There's no address to add; this entry just meant * "here's a new interface". */ return (0); } /* * "curdev" is an entry for this interface, and we have an * address for it; add an entry for that address to the * interface's list of addresses. */ return (add_addr_to_dev(curdev, addr, addr_size, netmask, netmask_size, broadaddr, broadaddr_size, dstaddr, dstaddr_size, errbuf)); } #endif /* _WIN32 */ /* * Add an entry to the list of addresses for an interface. * "curdev" is the entry for that interface. */ int add_addr_to_dev(pcap_if_t *curdev, struct sockaddr *addr, size_t addr_size, struct sockaddr *netmask, size_t netmask_size, struct sockaddr *broadaddr, size_t broadaddr_size, struct sockaddr *dstaddr, size_t dstaddr_size, char *errbuf) { pcap_addr_t *curaddr, *prevaddr, *nextaddr; /* * Allocate the new entry and fill it in. */ curaddr = (pcap_addr_t *)malloc(sizeof(pcap_addr_t)); if (curaddr == NULL) { pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, errno, "malloc"); return (-1); } curaddr->next = NULL; if (addr != NULL && addr_size != 0) { curaddr->addr = (struct sockaddr *)dup_sockaddr(addr, addr_size); if (curaddr->addr == NULL) { pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, errno, "malloc"); free(curaddr); return (-1); } } else curaddr->addr = NULL; if (netmask != NULL && netmask_size != 0) { curaddr->netmask = (struct sockaddr *)dup_sockaddr(netmask, netmask_size); if (curaddr->netmask == NULL) { pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, errno, "malloc"); if (curaddr->addr != NULL) free(curaddr->addr); free(curaddr); return (-1); } } else curaddr->netmask = NULL; if (broadaddr != NULL && broadaddr_size != 0) { curaddr->broadaddr = (struct sockaddr *)dup_sockaddr(broadaddr, broadaddr_size); if (curaddr->broadaddr == NULL) { pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, errno, "malloc"); if (curaddr->netmask != NULL) free(curaddr->netmask); if (curaddr->addr != NULL) free(curaddr->addr); free(curaddr); return (-1); } } else curaddr->broadaddr = NULL; if (dstaddr != NULL && dstaddr_size != 0) { curaddr->dstaddr = (struct sockaddr *)dup_sockaddr(dstaddr, dstaddr_size); if (curaddr->dstaddr == NULL) { pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, errno, "malloc"); if (curaddr->broadaddr != NULL) free(curaddr->broadaddr); if (curaddr->netmask != NULL) free(curaddr->netmask); if (curaddr->addr != NULL) free(curaddr->addr); free(curaddr); return (-1); } } else curaddr->dstaddr = NULL; /* * Find the end of the list of addresses. */ for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) { nextaddr = prevaddr->next; if (nextaddr == NULL) { /* * This is the end of the list. */ break; } } if (prevaddr == NULL) { /* * The list was empty; this is the first member. */ curdev->addresses = curaddr; } else { /* * "prevaddr" is the last member of the list; append * this member to it. */ prevaddr->next = curaddr; } return (0); } /* * Look for a given device in the specified list of devices. * * If we find it, return 0 and set *curdev_ret to point to it. * * If we don't find it, attempt to add an entry for it, with the specified * flags and description, and, if that succeeds, return 0, otherwise * return -1 and set errbuf to an error message. */ pcap_if_t * find_or_add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags, get_if_flags_func get_flags_func, const char *description, char *errbuf) { pcap_if_t *curdev; /* * Is there already an entry in the list for this device? */ curdev = find_dev(devlistp, name); if (curdev != NULL) { /* * Yes, return it. */ return (curdev); } /* * No, we didn't find it. */ /* * Try to get additional flags for the device. */ if ((*get_flags_func)(name, &flags, errbuf) == -1) { /* * Failed. */ return (NULL); } /* * Now, try to add it to the list of devices. */ return (add_dev(devlistp, name, flags, description, errbuf)); } /* * Look for a given device in the specified list of devices, and return * the entry for it if we find it or NULL if we don't. */ pcap_if_t * find_dev(pcap_if_list_t *devlistp, const char *name) { pcap_if_t *curdev; /* * Is there an entry in the list for this device? */ for (curdev = devlistp->beginning; curdev != NULL; curdev = curdev->next) { if (strcmp(name, curdev->name) == 0) { /* * We found it, so, yes, there is. No need to * add it. Provide the entry we found to our * caller. */ return (curdev); } } /* * No. */ return (NULL); } /* * Attempt to add an entry for a device, with the specified flags * and description, and, if that succeeds, return 0 and return a pointer * to the new entry, otherwise return NULL and set errbuf to an error * message. * * If we weren't given a description, try to get one. */ pcap_if_t * add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags, const char *description, char *errbuf) { pcap_if_t *curdev, *prevdev, *nextdev; u_int this_figure_of_merit, nextdev_figure_of_merit; curdev = malloc(sizeof(pcap_if_t)); if (curdev == NULL) { pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, errno, "malloc"); return (NULL); } /* * Fill in the entry. */ curdev->next = NULL; curdev->name = strdup(name); if (curdev->name == NULL) { pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, errno, "malloc"); free(curdev); return (NULL); } if (description == NULL) { /* * We weren't handed a description for the interface. */ curdev->description = NULL; } else { /* * We were handed a description; make a copy. */ curdev->description = strdup(description); if (curdev->description == NULL) { pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, errno, "malloc"); free(curdev->name); free(curdev); return (NULL); } } curdev->addresses = NULL; /* list starts out as empty */ curdev->flags = flags; /* * Add it to the list, in the appropriate location. * First, get the "figure of merit" for this interface. */ this_figure_of_merit = get_figure_of_merit(curdev); /* * Now look for the last interface with an figure of merit * less than or equal to the new interface's figure of merit. * * We start with "prevdev" being NULL, meaning we're before * the first element in the list. */ prevdev = NULL; for (;;) { /* * Get the interface after this one. */ if (prevdev == NULL) { /* * The next element is the first element. */ nextdev = devlistp->beginning; } else nextdev = prevdev->next; /* * Are we at the end of the list? */ if (nextdev == NULL) { /* * Yes - we have to put the new entry after "prevdev". */ break; } /* * Is the new interface's figure of merit less * than the next interface's figure of merit, * meaning that the new interface is better * than the next interface? */ nextdev_figure_of_merit = get_figure_of_merit(nextdev); if (this_figure_of_merit < nextdev_figure_of_merit) { /* * Yes - we should put the new entry * before "nextdev", i.e. after "prevdev". */ break; } prevdev = nextdev; } /* * Insert before "nextdev". */ curdev->next = nextdev; /* * Insert after "prevdev" - unless "prevdev" is null, * in which case this is the first interface. */ if (prevdev == NULL) { /* * This is the first interface. Make it * the first element in the list of devices. */ devlistp->beginning = curdev; } else prevdev->next = curdev; return (curdev); } /* * Free a list of interfaces. */ void pcap_freealldevs(pcap_if_t *alldevs) { pcap_if_t *curdev, *nextdev; pcap_addr_t *curaddr, *nextaddr; for (curdev = alldevs; curdev != NULL; curdev = nextdev) { nextdev = curdev->next; /* * Free all addresses. */ for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) { nextaddr = curaddr->next; if (curaddr->addr) free(curaddr->addr); if (curaddr->netmask) free(curaddr->netmask); if (curaddr->broadaddr) free(curaddr->broadaddr); if (curaddr->dstaddr) free(curaddr->dstaddr); free(curaddr); } /* * Free the name string. */ free(curdev->name); /* * Free the description string, if any. */ if (curdev->description != NULL) free(curdev->description); /* * Free the interface. */ free(curdev); } } /* * pcap-npf.c has its own pcap_lookupdev(), for compatibility reasons, as * it actually returns the names of all interfaces, with a NUL separator * between them; some callers may depend on that. * * MS-DOS has its own pcap_lookupdev(), but that might be useful only * as an optimization. * * In all other cases, we just use pcap_findalldevs() to get a list of * devices, and pick from that list. */ #if !defined(HAVE_PACKET32) && !defined(MSDOS) /* * Return the name of a network interface attached to the system, or NULL * if none can be found. The interface must be configured up; the * lowest unit number is preferred; loopback is ignored. */ char * pcap_lookupdev(char *errbuf) { pcap_if_t *alldevs; #ifdef _WIN32 /* * Windows - use the same size as the old WinPcap 3.1 code. * XXX - this is probably bigger than it needs to be. */ #define IF_NAMESIZE 8192 #else /* * UN*X - use the system's interface name size. * XXX - that might not be large enough for capture devices * that aren't regular network interfaces. */ /* for old BSD systems, including bsdi3 */ #ifndef IF_NAMESIZE #define IF_NAMESIZE IFNAMSIZ #endif #endif static char device[IF_NAMESIZE + 1]; char *ret; /* * We disable this in "new API" mode, because 1) in WinPcap/Npcap, * it may return UTF-16 strings, for backwards-compatibility * reasons, and we're also disabling the hack to make that work, * for not-going-past-the-end-of-a-string reasons, and 2) we * want its behavior to be consistent. * * In addition, it's not thread-safe, so we've marked it as * deprecated. */ if (pcap_new_api) { snprintf(errbuf, PCAP_ERRBUF_SIZE, "pcap_lookupdev() is deprecated and is not supported in programs calling pcap_init()"); return (NULL); } if (pcap_findalldevs(&alldevs, errbuf) == -1) return (NULL); if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) { /* * There are no devices on the list, or the first device * on the list is a loopback device, which means there * are no non-loopback devices on the list. This means * we can't return any device. * * XXX - why not return a loopback device? If we can't * capture on it, it won't be on the list, and if it's * on the list, there aren't any non-loopback devices, * so why not just supply it as the default device? */ (void)pcap_strlcpy(errbuf, "no suitable device found", PCAP_ERRBUF_SIZE); ret = NULL; } else { /* * Return the name of the first device on the list. */ (void)pcap_strlcpy(device, alldevs->name, sizeof(device)); ret = device; } pcap_freealldevs(alldevs); return (ret); } #endif /* !defined(HAVE_PACKET32) && !defined(MSDOS) */ #if !defined(_WIN32) && !defined(MSDOS) /* * We don't just fetch the entire list of devices, search for the * particular device, and use its first IPv4 address, as that's too * much work to get just one device's netmask. * * If we had an API to get attributes for a given device, we could * use that. */ int pcap_lookupnet(const char *device, bpf_u_int32 *netp, bpf_u_int32 *maskp, char *errbuf) { register int fd; register struct sockaddr_in *sin4; struct ifreq ifr; /* * The pseudo-device "any" listens on all interfaces and therefore * has the network address and -mask "0.0.0.0" therefore catching * all traffic. Using NULL for the interface is the same as "any". */ if (!device || strcmp(device, "any") == 0 #ifdef HAVE_DAG_API || strstr(device, "dag") != NULL #endif #ifdef HAVE_SEPTEL_API || strstr(device, "septel") != NULL #endif #ifdef PCAP_SUPPORT_BT || strstr(device, "bluetooth") != NULL #endif #ifdef PCAP_SUPPORT_LINUX_USBMON || strstr(device, "usbmon") != NULL #endif #ifdef HAVE_SNF_API || strstr(device, "snf") != NULL #endif #ifdef PCAP_SUPPORT_NETMAP || strncmp(device, "netmap:", 7) == 0 || strncmp(device, "vale", 4) == 0 #endif #ifdef PCAP_SUPPORT_DPDK || strncmp(device, "dpdk:", 5) == 0 #endif ) { *netp = *maskp = 0; return 0; } fd = socket(AF_INET, SOCK_DGRAM, 0); if (fd < 0) { pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, errno, "socket"); return (-1); } memset(&ifr, 0, sizeof(ifr)); #ifdef linux /* XXX Work around Linux kernel bug */ ifr.ifr_addr.sa_family = AF_INET; #endif (void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) { if (errno == EADDRNOTAVAIL) { (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: no IPv4 address assigned", device); } else { pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, errno, "SIOCGIFADDR: %s", device); } (void)close(fd); return (-1); } sin4 = (struct sockaddr_in *)&ifr.ifr_addr; *netp = sin4->sin_addr.s_addr; memset(&ifr, 0, sizeof(ifr)); #ifdef linux /* XXX Work around Linux kernel bug */ ifr.ifr_addr.sa_family = AF_INET; #endif (void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) { pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, errno, "SIOCGIFNETMASK: %s", device); (void)close(fd); return (-1); } (void)close(fd); *maskp = sin4->sin_addr.s_addr; if (*maskp == 0) { if (IN_CLASSA(*netp)) *maskp = IN_CLASSA_NET; else if (IN_CLASSB(*netp)) *maskp = IN_CLASSB_NET; else if (IN_CLASSC(*netp)) *maskp = IN_CLASSC_NET; else { (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "inet class for 0x%x unknown", *netp); return (-1); } } *netp &= *maskp; return (0); } #endif /* !defined(_WIN32) && !defined(MSDOS) */ #ifdef ENABLE_REMOTE #include "pcap-rpcap.h" /* * Extract a substring from a string. */ static char * get_substring(const char *p, size_t len, char *ebuf) { char *token; token = malloc(len + 1); if (token == NULL) { pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, errno, "malloc"); return (NULL); } memcpy(token, p, len); token[len] = '\0'; return (token); } /* * Parse a capture source that might be a URL. * * If the source is not a URL, *schemep, *userinfop, *hostp, and *portp * are set to NULL, *pathp is set to point to the source, and 0 is * returned. * * If source is a URL, and the URL refers to a local device (a special * case of rpcap:), *schemep, *userinfop, *hostp, and *portp are set * to NULL, *pathp is set to point to the device name, and 0 is returned. * * If source is a URL, and it's not a special case that refers to a local * device, and the parse succeeds: * * *schemep is set to point to an allocated string containing the scheme; * * if user information is present in the URL, *userinfop is set to point * to an allocated string containing the user information, otherwise * it's set to NULL; * * if host information is present in the URL, *hostp is set to point * to an allocated string containing the host information, otherwise * it's set to NULL; * * if a port number is present in the URL, *portp is set to point * to an allocated string containing the port number, otherwise * it's set to NULL; * * *pathp is set to point to an allocated string containing the * path; * * and 0 is returned. * * If the parse fails, ebuf is set to an error string, and -1 is returned. */ static int pcap_parse_source(const char *source, char **schemep, char **userinfop, char **hostp, char **portp, char **pathp, char *ebuf) { char *colonp; size_t scheme_len; char *scheme; const char *endp; size_t authority_len; char *authority; char *parsep, *atsignp, *bracketp; char *userinfo, *host, *port, *path; /* * Start out returning nothing. */ *schemep = NULL; *userinfop = NULL; *hostp = NULL; *portp = NULL; *pathp = NULL; /* * RFC 3986 says: * * URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ] * * hier-part = "//" authority path-abempty * / path-absolute * / path-rootless * / path-empty * * authority = [ userinfo "@" ] host [ ":" port ] * * userinfo = *( unreserved / pct-encoded / sub-delims / ":" ) * * Step 1: look for the ":" at the end of the scheme. * A colon in the source is *NOT* sufficient to indicate that * this is a URL, as interface names on some platforms might * include colons (e.g., I think some Solaris interfaces * might). */ colonp = strchr(source, ':'); if (colonp == NULL) { /* * The source is the device to open. * Return a NULL pointer for the scheme, user information, * host, and port, and return the device as the path. */ *pathp = strdup(source); if (*pathp == NULL) { pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, errno, "malloc"); return (-1); } return (0); } /* * All schemes must have "//" after them, i.e. we only support * hier-part = "//" authority path-abempty, not * hier-part = path-absolute * hier-part = path-rootless * hier-part = path-empty * * We need that in order to distinguish between a local device * name that happens to contain a colon and a URI. */ if (strncmp(colonp + 1, "//", 2) != 0) { /* * The source is the device to open. * Return a NULL pointer for the scheme, user information, * host, and port, and return the device as the path. */ *pathp = strdup(source); if (*pathp == NULL) { pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, errno, "malloc"); return (-1); } return (0); } /* * XXX - check whether the purported scheme could be a scheme? */ /* * OK, this looks like a URL. * Get the scheme. */ scheme_len = colonp - source; scheme = malloc(scheme_len + 1); if (scheme == NULL) { pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, errno, "malloc"); return (-1); } memcpy(scheme, source, scheme_len); scheme[scheme_len] = '\0'; /* * Treat file: specially - take everything after file:// as * the pathname. */ if (pcap_strcasecmp(scheme, "file") == 0) { *pathp = strdup(colonp + 3); if (*pathp == NULL) { pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, errno, "malloc"); free(scheme); return (-1); } *schemep = scheme; return (0); } /* * The WinPcap documentation says you can specify a local * interface with "rpcap://{device}"; we special-case * that here. If the scheme is "rpcap", and there are * no slashes past the "//", we just return the device. * * XXX - %-escaping? */ if ((pcap_strcasecmp(scheme, "rpcap") == 0 || pcap_strcasecmp(scheme, "rpcaps") == 0) && strchr(colonp + 3, '/') == NULL) { /* * Local device. * * Return a NULL pointer for the scheme, user information, * host, and port, and return the device as the path. */ free(scheme); *pathp = strdup(colonp + 3); if (*pathp == NULL) { pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, errno, "malloc"); return (-1); } return (0); } /* * OK, now start parsing the authority. * Get token, terminated with / or terminated at the end of * the string. */ authority_len = strcspn(colonp + 3, "/"); authority = get_substring(colonp + 3, authority_len, ebuf); if (authority == NULL) { /* * Error. */ free(scheme); return (-1); } endp = colonp + 3 + authority_len; /* * Now carve the authority field into its components. */ parsep = authority; /* * Is there a userinfo field? */ atsignp = strchr(parsep, '@'); if (atsignp != NULL) { /* * Yes. */ size_t userinfo_len; userinfo_len = atsignp - parsep; userinfo = get_substring(parsep, userinfo_len, ebuf); if (userinfo == NULL) { /* * Error. */ free(authority); free(scheme); return (-1); } parsep = atsignp + 1; } else { /* * No. */ userinfo = NULL; } /* * Is there a host field? */ if (*parsep == '\0') { /* * No; there's no host field or port field. */ host = NULL; port = NULL; } else { /* * Yes. */ size_t host_len; /* * Is it an IP-literal? */ if (*parsep == '[') { /* * Yes. * Treat verything up to the closing square * bracket as the IP-Literal; we don't worry * about whether it's a valid IPv6address or * IPvFuture (or an IPv4address, for that * matter, just in case we get handed a * URL with an IPv4 IP-Literal, of the sort * that pcap_createsrcstr() used to generate, * and that pcap_parsesrcstr(), in the original * WinPcap code, accepted). */ bracketp = strchr(parsep, ']'); if (bracketp == NULL) { /* * There's no closing square bracket. */ snprintf(ebuf, PCAP_ERRBUF_SIZE, "IP-literal in URL doesn't end with ]"); free(userinfo); free(authority); free(scheme); return (-1); } if (*(bracketp + 1) != '\0' && *(bracketp + 1) != ':') { /* * There's extra crud after the * closing square bracketn. */ snprintf(ebuf, PCAP_ERRBUF_SIZE, "Extra text after IP-literal in URL"); free(userinfo); free(authority); free(scheme); return (-1); } host_len = (bracketp - 1) - parsep; host = get_substring(parsep + 1, host_len, ebuf); if (host == NULL) { /* * Error. */ free(userinfo); free(authority); free(scheme); return (-1); } parsep = bracketp + 1; } else { /* * No. * Treat everything up to a : or the end of * the string as the host. */ host_len = strcspn(parsep, ":"); host = get_substring(parsep, host_len, ebuf); if (host == NULL) { /* * Error. */ free(userinfo); free(authority); free(scheme); return (-1); } parsep = parsep + host_len; } /* * Is there a port field? */ if (*parsep == ':') { /* * Yes. It's the rest of the authority field. */ size_t port_len; parsep++; port_len = strlen(parsep); port = get_substring(parsep, port_len, ebuf); if (port == NULL) { /* * Error. */ free(host); free(userinfo); free(authority); free(scheme); return (-1); } } else { /* * No. */ port = NULL; } } free(authority); /* * Everything else is the path. Strip off the leading /. */ if (*endp == '\0') path = strdup(""); else path = strdup(endp + 1); if (path == NULL) { pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, errno, "malloc"); free(port); free(host); free(userinfo); free(scheme); return (-1); } *schemep = scheme; *userinfop = userinfo; *hostp = host; *portp = port; *pathp = path; return (0); } int pcap_createsrcstr_ex(char *source, int type, const char *host, const char *port, const char *name, unsigned char uses_ssl, char *errbuf) { switch (type) { case PCAP_SRC_FILE: pcap_strlcpy(source, PCAP_SRC_FILE_STRING, PCAP_BUF_SIZE); if (name != NULL && *name != '\0') { pcap_strlcat(source, name, PCAP_BUF_SIZE); return (0); } else { snprintf(errbuf, PCAP_ERRBUF_SIZE, "The file name cannot be NULL."); return (-1); } case PCAP_SRC_IFREMOTE: pcap_strlcpy(source, (uses_ssl ? "rpcaps://" : PCAP_SRC_IF_STRING), PCAP_BUF_SIZE); if (host != NULL && *host != '\0') { if (strchr(host, ':') != NULL) { /* * The host name contains a colon, so it's * probably an IPv6 address, and needs to * be included in square brackets. */ pcap_strlcat(source, "[", PCAP_BUF_SIZE); pcap_strlcat(source, host, PCAP_BUF_SIZE); pcap_strlcat(source, "]", PCAP_BUF_SIZE); } else pcap_strlcat(source, host, PCAP_BUF_SIZE); if (port != NULL && *port != '\0') { pcap_strlcat(source, ":", PCAP_BUF_SIZE); pcap_strlcat(source, port, PCAP_BUF_SIZE); } pcap_strlcat(source, "/", PCAP_BUF_SIZE); } else { snprintf(errbuf, PCAP_ERRBUF_SIZE, "The host name cannot be NULL."); return (-1); } if (name != NULL && *name != '\0') pcap_strlcat(source, name, PCAP_BUF_SIZE); return (0); case PCAP_SRC_IFLOCAL: pcap_strlcpy(source, PCAP_SRC_IF_STRING, PCAP_BUF_SIZE); if (name != NULL && *name != '\0') pcap_strlcat(source, name, PCAP_BUF_SIZE); return (0); default: snprintf(errbuf, PCAP_ERRBUF_SIZE, "The interface type is not valid."); return (-1); } } int pcap_createsrcstr(char *source, int type, const char *host, const char *port, const char *name, char *errbuf) { return (pcap_createsrcstr_ex(source, type, host, port, name, 0, errbuf)); } int pcap_parsesrcstr_ex(const char *source, int *type, char *host, char *port, char *name, unsigned char *uses_ssl, char *errbuf) { char *scheme, *tmpuserinfo, *tmphost, *tmpport, *tmppath; /* Initialization stuff */ if (host) *host = '\0'; if (port) *port = '\0'; if (name) *name = '\0'; if (uses_ssl) *uses_ssl = 0; /* Parse the source string */ if (pcap_parse_source(source, &scheme, &tmpuserinfo, &tmphost, &tmpport, &tmppath, errbuf) == -1) { /* * Fail. */ return (-1); } if (scheme == NULL) { /* * Local device. */ if (name && tmppath) pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE); if (type) *type = PCAP_SRC_IFLOCAL; free(tmppath); free(tmpport); free(tmphost); free(tmpuserinfo); return (0); } int is_rpcap = 0; if (strcmp(scheme, "rpcaps") == 0) { is_rpcap = 1; if (uses_ssl) *uses_ssl = 1; } else if (strcmp(scheme, "rpcap") == 0) { is_rpcap = 1; } if (is_rpcap) { /* * rpcap[s]:// * * pcap_parse_source() has already handled the case of * rpcap[s]://device */ if (host && tmphost) { if (tmpuserinfo) snprintf(host, PCAP_BUF_SIZE, "%s@%s", tmpuserinfo, tmphost); else pcap_strlcpy(host, tmphost, PCAP_BUF_SIZE); } if (port && tmpport) pcap_strlcpy(port, tmpport, PCAP_BUF_SIZE); if (name && tmppath) pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE); if (type) *type = PCAP_SRC_IFREMOTE; free(tmppath); free(tmpport); free(tmphost); free(tmpuserinfo); free(scheme); return (0); } if (strcmp(scheme, "file") == 0) { /* * file:// */ if (name && tmppath) pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE); if (type) *type = PCAP_SRC_FILE; free(tmppath); free(tmpport); free(tmphost); free(tmpuserinfo); free(scheme); return (0); } /* * Neither rpcap: nor file:; just treat the entire string * as a local device. */ if (name) pcap_strlcpy(name, source, PCAP_BUF_SIZE); if (type) *type = PCAP_SRC_IFLOCAL; free(tmppath); free(tmpport); free(tmphost); free(tmpuserinfo); free(scheme); return (0); } int pcap_parsesrcstr(const char *source, int *type, char *host, char *port, char *name, char *errbuf) { return (pcap_parsesrcstr_ex(source, type, host, port, name, NULL, errbuf)); } #endif pcap_t * pcap_create(const char *device, char *errbuf) { size_t i; int is_theirs; pcap_t *p; char *device_str; /* * A null device name is equivalent to the "any" device - * which might not be supported on this platform, but * this means that you'll get a "not supported" error * rather than, say, a crash when we try to dereference * the null pointer. */ if (device == NULL) device_str = strdup("any"); else { #ifdef _WIN32 /* * On Windows, for backwards compatibility reasons, * pcap_lookupdev() returns a pointer to a sequence of * pairs of UTF-16LE device names and local code page * description strings. * * This means that if a program uses pcap_lookupdev() * to get a default device, and hands that to an API * that opens devices, we'll get handed a UTF-16LE * string, not a string in the local code page. * * To work around that, we check whether the string * looks as if it might be a UTF-16LE string and, if * so, convert it back to the local code page's * extended ASCII. * * We disable that check in "new API" mode, because: * * 1) You *cannot* reliably detect whether a * string is UTF-16LE or not; "a" could either * be a one-character ASCII string or the first * character of a UTF-16LE string. * * 2) Doing that test can run past the end of * the string, if it's a 1-character ASCII * string * * This particular version of this heuristic dates * back to WinPcap 4.1.1; PacketOpenAdapter() does * uses the same heuristic, with the exact same * vulnerability. * * That's why we disable this in "new API" mode. * We keep it around in legacy mode for backwards * compatibility. */ if (!pcap_new_api && device[0] != '\0' && device[1] == '\0') { size_t length; length = wcslen((wchar_t *)device); device_str = (char *)malloc(length + 1); if (device_str == NULL) { pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, errno, "malloc"); return (NULL); } snprintf(device_str, length + 1, "%ws", (const wchar_t *)device); } else #endif device_str = strdup(device); } if (device_str == NULL) { pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, errno, "malloc"); return (NULL); } /* * Try each of the non-local-network-interface capture * source types until we find one that works for this * device or run out of types. */ for (i = 0; capture_source_types[i].create_op != NULL; i++) { is_theirs = 0; p = capture_source_types[i].create_op(device_str, errbuf, &is_theirs); if (is_theirs) { /* * The device name refers to a device of the * type in question; either it succeeded, * in which case p refers to a pcap_t to * later activate for the device, or it * failed, in which case p is null and we * should return that to report the failure * to create. */ if (p == NULL) { /* * We assume the caller filled in errbuf. */ free(device_str); return (NULL); } p->opt.device = device_str; return (p); } } /* * OK, try it as a regular network interface. */ p = pcap_create_interface(device_str, errbuf); if (p == NULL) { /* * We assume the caller filled in errbuf. */ free(device_str); return (NULL); } p->opt.device = device_str; return (p); } /* * Set nonblocking mode on an unactivated pcap_t; this sets a flag * checked by pcap_activate(), which sets the mode after calling * the activate routine. */ static int pcap_setnonblock_unactivated(pcap_t *p, int nonblock) { p->opt.nonblock = nonblock; return (0); } static void initialize_ops(pcap_t *p) { /* * Set operation pointers for operations that only work on * an activated pcap_t to point to a routine that returns * a "this isn't activated" error. */ p->read_op = pcap_read_not_initialized; p->inject_op = pcap_inject_not_initialized; p->setfilter_op = pcap_setfilter_not_initialized; p->setdirection_op = pcap_setdirection_not_initialized; p->set_datalink_op = pcap_set_datalink_not_initialized; p->getnonblock_op = pcap_getnonblock_not_initialized; p->stats_op = pcap_stats_not_initialized; #ifdef _WIN32 p->stats_ex_op = pcap_stats_ex_not_initialized; p->setbuff_op = pcap_setbuff_not_initialized; p->setmode_op = pcap_setmode_not_initialized; p->setmintocopy_op = pcap_setmintocopy_not_initialized; p->getevent_op = pcap_getevent_not_initialized; p->oid_get_request_op = pcap_oid_get_request_not_initialized; p->oid_set_request_op = pcap_oid_set_request_not_initialized; p->sendqueue_transmit_op = pcap_sendqueue_transmit_not_initialized; p->setuserbuffer_op = pcap_setuserbuffer_not_initialized; p->live_dump_op = pcap_live_dump_not_initialized; p->live_dump_ended_op = pcap_live_dump_ended_not_initialized; p->get_airpcap_handle_op = pcap_get_airpcap_handle_not_initialized; #endif /* * Default cleanup operation - implementations can override * this, but should call pcap_cleanup_live_common() after * doing their own additional cleanup. */ p->cleanup_op = pcap_cleanup_live_common; /* * In most cases, the standard one-shot callback can * be used for pcap_next()/pcap_next_ex(). */ p->oneshot_callback = pcap_oneshot; /* * Default breakloop operation - implementations can override * this, but should call pcap_breakloop_common() before doing * their own logic. */ p->breakloop_op = pcap_breakloop_common; } static pcap_t * pcap_alloc_pcap_t(char *ebuf, size_t total_size, size_t private_offset) { char *chunk; pcap_t *p; /* * total_size is the size of a structure containing a pcap_t * followed by a private structure. */ chunk = calloc(total_size, 1); if (chunk == NULL) { pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, errno, "malloc"); return (NULL); } /* * Get a pointer to the pcap_t at the beginning. */ p = (pcap_t *)chunk; #ifdef _WIN32 p->handle = INVALID_HANDLE_VALUE; /* not opened yet */ #else /* _WIN32 */ p->fd = -1; /* not opened yet */ #ifndef MSDOS p->selectable_fd = -1; p->required_select_timeout = NULL; #endif /* MSDOS */ #endif /* _WIN32 */ /* * private_offset is the offset, in bytes, of the private * data from the beginning of the structure. * * Set the pointer to the private data; that's private_offset * bytes past the pcap_t. */ p->priv = (void *)(chunk + private_offset); return (p); } pcap_t * pcap_create_common(char *ebuf, size_t total_size, size_t private_offset) { pcap_t *p; p = pcap_alloc_pcap_t(ebuf, total_size, private_offset); if (p == NULL) return (NULL); /* * Default to "can't set rfmon mode"; if it's supported by * a platform, the create routine that called us can set * the op to its routine to check whether a particular * device supports it. */ p->can_set_rfmon_op = pcap_cant_set_rfmon; /* * If pcap_setnonblock() is called on a not-yet-activated * pcap_t, default to setting a flag and turning * on non-blocking mode when activated. */ p->setnonblock_op = pcap_setnonblock_unactivated; initialize_ops(p); /* put in some defaults*/ p->snapshot = 0; /* max packet size unspecified */ p->opt.timeout = 0; /* no timeout specified */ p->opt.buffer_size = 0; /* use the platform's default */ p->opt.promisc = 0; p->opt.rfmon = 0; p->opt.immediate = 0; p->opt.tstamp_type = -1; /* default to not setting time stamp type */ p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO; /* * Platform-dependent options. */ #ifdef __linux__ p->opt.protocol = 0; #endif #ifdef _WIN32 p->opt.nocapture_local = 0; #endif /* * Start out with no BPF code generation flags set. */ p->bpf_codegen_flags = 0; return (p); } int pcap_check_activated(pcap_t *p) { if (p->activated) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform " " operation on activated capture"); return (-1); } return (0); } int pcap_set_snaplen(pcap_t *p, int snaplen) { if (pcap_check_activated(p)) return (PCAP_ERROR_ACTIVATED); p->snapshot = snaplen; return (0); } int pcap_set_promisc(pcap_t *p, int promisc) { if (pcap_check_activated(p)) return (PCAP_ERROR_ACTIVATED); p->opt.promisc = promisc; return (0); } int pcap_set_rfmon(pcap_t *p, int rfmon) { if (pcap_check_activated(p)) return (PCAP_ERROR_ACTIVATED); p->opt.rfmon = rfmon; return (0); } int pcap_set_timeout(pcap_t *p, int timeout_ms) { if (pcap_check_activated(p)) return (PCAP_ERROR_ACTIVATED); p->opt.timeout = timeout_ms; return (0); } int pcap_set_tstamp_type(pcap_t *p, int tstamp_type) { int i; if (pcap_check_activated(p)) return (PCAP_ERROR_ACTIVATED); /* * The argument should have been u_int, but that's too late * to change now - it's an API. */ if (tstamp_type < 0) return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP); /* * If p->tstamp_type_count is 0, we only support PCAP_TSTAMP_HOST; * the default time stamp type is PCAP_TSTAMP_HOST. */ if (p->tstamp_type_count == 0) { if (tstamp_type == PCAP_TSTAMP_HOST) { p->opt.tstamp_type = tstamp_type; return (0); } } else { /* * Check whether we claim to support this type of time stamp. */ for (i = 0; i < p->tstamp_type_count; i++) { if (p->tstamp_type_list[i] == (u_int)tstamp_type) { /* * Yes. */ p->opt.tstamp_type = tstamp_type; return (0); } } } /* * We don't support this type of time stamp. */ return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP); } int pcap_set_immediate_mode(pcap_t *p, int immediate) { if (pcap_check_activated(p)) return (PCAP_ERROR_ACTIVATED); p->opt.immediate = immediate; return (0); } int pcap_set_buffer_size(pcap_t *p, int buffer_size) { if (pcap_check_activated(p)) return (PCAP_ERROR_ACTIVATED); if (buffer_size <= 0) { /* * Silently ignore invalid values. */ return (0); } p->opt.buffer_size = buffer_size; return (0); } int pcap_set_tstamp_precision(pcap_t *p, int tstamp_precision) { int i; if (pcap_check_activated(p)) return (PCAP_ERROR_ACTIVATED); /* * The argument should have been u_int, but that's too late * to change now - it's an API. */ if (tstamp_precision < 0) return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP); /* * If p->tstamp_precision_count is 0, we only support setting * the time stamp precision to microsecond precision; every * pcap module *MUST* support microsecond precision, even if * it does so by converting the native precision to * microseconds. */ if (p->tstamp_precision_count == 0) { if (tstamp_precision == PCAP_TSTAMP_PRECISION_MICRO) { p->opt.tstamp_precision = tstamp_precision; return (0); } } else { /* * Check whether we claim to support this precision of * time stamp. */ for (i = 0; i < p->tstamp_precision_count; i++) { if (p->tstamp_precision_list[i] == (u_int)tstamp_precision) { /* * Yes. */ p->opt.tstamp_precision = tstamp_precision; return (0); } } } /* * We don't support this time stamp precision. */ return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP); } int pcap_get_tstamp_precision(pcap_t *p) { return (p->opt.tstamp_precision); } int pcap_activate(pcap_t *p) { int status; /* * Catch attempts to re-activate an already-activated * pcap_t; this should, for example, catch code that * calls pcap_open_live() followed by pcap_activate(), * as some code that showed up in a Stack Exchange * question did. */ if (pcap_check_activated(p)) return (PCAP_ERROR_ACTIVATED); status = p->activate_op(p); if (status >= 0) { /* * If somebody requested non-blocking mode before * calling pcap_activate(), turn it on now. */ if (p->opt.nonblock) { status = p->setnonblock_op(p, 1); if (status < 0) { /* * Failed. Undo everything done by * the activate operation. */ p->cleanup_op(p); initialize_ops(p); return (status); } } p->activated = 1; } else { if (p->errbuf[0] == '\0') { /* * No error message supplied by the activate routine; * for the benefit of programs that don't specially * handle errors other than PCAP_ERROR, return the * error message corresponding to the status. */ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s", pcap_statustostr(status)); } /* * Undo any operation pointer setting, etc. done by * the activate operation. */ initialize_ops(p); } return (status); } pcap_t * pcap_open_live(const char *device, int snaplen, int promisc, int to_ms, char *errbuf) { pcap_t *p; int status; #ifdef ENABLE_REMOTE char host[PCAP_BUF_SIZE + 1]; char port[PCAP_BUF_SIZE + 1]; char name[PCAP_BUF_SIZE + 1]; int srctype; /* * A null device name is equivalent to the "any" device - * which might not be supported on this platform, but * this means that you'll get a "not supported" error * rather than, say, a crash when we try to dereference * the null pointer. */ if (device == NULL) device = "any"; /* * Retrofit - we have to make older applications compatible with * remote capture. * So we're calling pcap_open_remote() from here; this is a very * dirty hack. * Obviously, we cannot exploit all the new features; for instance, * we cannot send authentication, we cannot use a UDP data connection, * and so on. */ if (pcap_parsesrcstr(device, &srctype, host, port, name, errbuf)) return (NULL); if (srctype == PCAP_SRC_IFREMOTE) { /* * Although we already have host, port and iface, we prefer * to pass only 'device' to pcap_open_rpcap(), so that it has * to call pcap_parsesrcstr() again. * This is less optimized, but much clearer. */ return (pcap_open_rpcap(device, snaplen, promisc ? PCAP_OPENFLAG_PROMISCUOUS : 0, to_ms, NULL, errbuf)); } if (srctype == PCAP_SRC_FILE) { snprintf(errbuf, PCAP_ERRBUF_SIZE, "unknown URL scheme \"file\""); return (NULL); } if (srctype == PCAP_SRC_IFLOCAL) { /* * If it starts with rpcap://, that refers to a local device * (no host part in the URL). Remove the rpcap://, and * fall through to the regular open path. */ if (strncmp(device, PCAP_SRC_IF_STRING, strlen(PCAP_SRC_IF_STRING)) == 0) { size_t len = strlen(device) - strlen(PCAP_SRC_IF_STRING) + 1; if (len > 0) device += strlen(PCAP_SRC_IF_STRING); } } #endif /* ENABLE_REMOTE */ p = pcap_create(device, errbuf); if (p == NULL) return (NULL); status = pcap_set_snaplen(p, snaplen); if (status < 0) goto fail; status = pcap_set_promisc(p, promisc); if (status < 0) goto fail; status = pcap_set_timeout(p, to_ms); if (status < 0) goto fail; /* * Mark this as opened with pcap_open_live(), so that, for * example, we show the full list of DLT_ values, rather * than just the ones that are compatible with capturing * when not in monitor mode. That allows existing applications * to work the way they used to work, but allows new applications * that know about the new open API to, for example, find out the * DLT_ values that they can select without changing whether * the adapter is in monitor mode or not. */ p->oldstyle = 1; status = pcap_activate(p); if (status < 0) goto fail; return (p); fail: if (status == PCAP_ERROR) { /* * Another buffer is a bit cumbersome, but it avoids * -Wformat-truncation. */ char trimbuf[PCAP_ERRBUF_SIZE - 5]; /* 2 bytes shorter */ pcap_strlcpy(trimbuf, p->errbuf, sizeof(trimbuf)); snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %.*s", device, PCAP_ERRBUF_SIZE - 3, trimbuf); } else if (status == PCAP_ERROR_NO_SUCH_DEVICE || status == PCAP_ERROR_PERM_DENIED || status == PCAP_ERROR_PROMISC_PERM_DENIED) { /* * Only show the additional message if it's not * empty. */ if (p->errbuf[0] != '\0') { /* * Idem. */ char trimbuf[PCAP_ERRBUF_SIZE - 8]; /* 2 bytes shorter */ pcap_strlcpy(trimbuf, p->errbuf, sizeof(trimbuf)); snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%.*s)", device, pcap_statustostr(status), PCAP_ERRBUF_SIZE - 6, trimbuf); } else { snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", device, pcap_statustostr(status)); } } else { snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", device, pcap_statustostr(status)); } pcap_close(p); return (NULL); } pcap_t * pcap_open_offline_common(char *ebuf, size_t total_size, size_t private_offset) { pcap_t *p; p = pcap_alloc_pcap_t(ebuf, total_size, private_offset); if (p == NULL) return (NULL); p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO; return (p); } int pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user) { return (p->read_op(p, cnt, callback, user)); } int pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user) { register int n; for (;;) { if (p->rfile != NULL) { /* * 0 means EOF, so don't loop if we get 0. */ n = pcap_offline_read(p, cnt, callback, user); } else { /* * XXX keep reading until we get something * (or an error occurs) */ do { n = p->read_op(p, cnt, callback, user); } while (n == 0); } if (n <= 0) return (n); if (!PACKET_COUNT_IS_UNLIMITED(cnt)) { cnt -= n; if (cnt <= 0) return (0); } } } /* * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate. */ void pcap_breakloop(pcap_t *p) { p->breakloop_op(p); } int pcap_datalink(pcap_t *p) { if (!p->activated) return (PCAP_ERROR_NOT_ACTIVATED); return (p->linktype); } int pcap_datalink_ext(pcap_t *p) { if (!p->activated) return (PCAP_ERROR_NOT_ACTIVATED); return (p->linktype_ext); } int pcap_list_datalinks(pcap_t *p, int **dlt_buffer) { if (!p->activated) return (PCAP_ERROR_NOT_ACTIVATED); if (p->dlt_count == 0) { /* * We couldn't fetch the list of DLTs, which means * this platform doesn't support changing the * DLT for an interface. Return a list of DLTs * containing only the DLT this device supports. */ *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer)); if (*dlt_buffer == NULL) { pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), errno, "malloc"); return (PCAP_ERROR); } **dlt_buffer = p->linktype; return (1); } else { *dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count); if (*dlt_buffer == NULL) { pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), errno, "malloc"); return (PCAP_ERROR); } (void)memcpy(*dlt_buffer, p->dlt_list, sizeof(**dlt_buffer) * p->dlt_count); return (p->dlt_count); } } /* * In Windows, you might have a library built with one version of the * C runtime library and an application built with another version of * the C runtime library, which means that the library might use one * version of malloc() and free() and the application might use another * version of malloc() and free(). If so, that means something * allocated by the library cannot be freed by the application, so we * need to have a pcap_free_datalinks() routine to free up the list * allocated by pcap_list_datalinks(), even though it's just a wrapper * around free(). */ void pcap_free_datalinks(int *dlt_list) { free(dlt_list); } int pcap_set_datalink(pcap_t *p, int dlt) { int i; const char *dlt_name; if (dlt < 0) goto unsupported; if (p->dlt_count == 0 || p->set_datalink_op == NULL) { /* * We couldn't fetch the list of DLTs, or we don't * have a "set datalink" operation, which means * this platform doesn't support changing the * DLT for an interface. Check whether the new * DLT is the one this interface supports. */ if (p->linktype != dlt) goto unsupported; /* * It is, so there's nothing we need to do here. */ return (0); } for (i = 0; i < p->dlt_count; i++) if (p->dlt_list[i] == (u_int)dlt) break; if (i >= p->dlt_count) goto unsupported; if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB && dlt == DLT_DOCSIS) { /* * This is presumably an Ethernet device, as the first * link-layer type it offers is DLT_EN10MB, and the only * other type it offers is DLT_DOCSIS. That means that * we can't tell the driver to supply DOCSIS link-layer * headers - we're just pretending that's what we're * getting, as, presumably, we're capturing on a dedicated * link to a Cisco Cable Modem Termination System, and * it's putting raw DOCSIS frames on the wire inside low-level * Ethernet framing. */ p->linktype = dlt; return (0); } if (p->set_datalink_op(p, dlt) == -1) return (-1); p->linktype = dlt; return (0); unsupported: dlt_name = pcap_datalink_val_to_name(dlt); if (dlt_name != NULL) { (void) snprintf(p->errbuf, sizeof(p->errbuf), "%s is not one of the DLTs supported by this device", dlt_name); } else { (void) snprintf(p->errbuf, sizeof(p->errbuf), "DLT %d is not one of the DLTs supported by this device", dlt); } return (-1); } /* * This array is designed for mapping upper and lower case letter * together for a case independent comparison. The mappings are * based upon ascii character sequences. */ static const u_char charmap[] = { (u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003', (u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007', (u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013', (u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017', (u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023', (u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027', (u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033', (u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037', (u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043', (u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047', (u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053', (u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057', (u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063', (u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067', (u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073', (u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077', (u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143', (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133', (u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137', (u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143', (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147', (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153', (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157', (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163', (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167', (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173', (u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177', (u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203', (u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207', (u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213', (u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217', (u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223', (u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227', (u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233', (u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237', (u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243', (u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247', (u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253', (u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257', (u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263', (u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267', (u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273', (u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277', (u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343', (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333', (u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337', (u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343', (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347', (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353', (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357', (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363', (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367', (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373', (u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377', }; int pcap_strcasecmp(const char *s1, const char *s2) { register const u_char *cm = charmap, *us1 = (const u_char *)s1, *us2 = (const u_char *)s2; while (cm[*us1] == cm[*us2++]) if (*us1++ == '\0') return(0); return (cm[*us1] - cm[*--us2]); } struct dlt_choice { const char *name; const char *description; int dlt; }; #define DLT_CHOICE(code, description) { #code, description, DLT_ ## code } #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 } static struct dlt_choice dlt_choices[] = { DLT_CHOICE(NULL, "BSD loopback"), DLT_CHOICE(EN10MB, "Ethernet"), DLT_CHOICE(IEEE802, "Token ring"), DLT_CHOICE(ARCNET, "BSD ARCNET"), DLT_CHOICE(SLIP, "SLIP"), DLT_CHOICE(PPP, "PPP"), DLT_CHOICE(FDDI, "FDDI"), DLT_CHOICE(ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"), DLT_CHOICE(RAW, "Raw IP"), DLT_CHOICE(SLIP_BSDOS, "BSD/OS SLIP"), DLT_CHOICE(PPP_BSDOS, "BSD/OS PPP"), DLT_CHOICE(ATM_CLIP, "Linux Classical IP over ATM"), DLT_CHOICE(PPP_SERIAL, "PPP over serial"), DLT_CHOICE(PPP_ETHER, "PPPoE"), DLT_CHOICE(SYMANTEC_FIREWALL, "Symantec Firewall"), DLT_CHOICE(C_HDLC, "Cisco HDLC"), DLT_CHOICE(IEEE802_11, "802.11"), DLT_CHOICE(FRELAY, "Frame Relay"), DLT_CHOICE(LOOP, "OpenBSD loopback"), DLT_CHOICE(ENC, "OpenBSD encapsulated IP"), DLT_CHOICE(LINUX_SLL, "Linux cooked v1"), DLT_CHOICE(LTALK, "Localtalk"), DLT_CHOICE(PFLOG, "OpenBSD pflog file"), DLT_CHOICE(PFSYNC, "Packet filter state syncing"), DLT_CHOICE(PRISM_HEADER, "802.11 plus Prism header"), DLT_CHOICE(IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"), DLT_CHOICE(SUNATM, "Sun raw ATM"), DLT_CHOICE(IEEE802_11_RADIO, "802.11 plus radiotap header"), DLT_CHOICE(ARCNET_LINUX, "Linux ARCNET"), DLT_CHOICE(JUNIPER_MLPPP, "Juniper Multi-Link PPP"), DLT_CHOICE(JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"), DLT_CHOICE(JUNIPER_ES, "Juniper Encryption Services PIC"), DLT_CHOICE(JUNIPER_GGSN, "Juniper GGSN PIC"), DLT_CHOICE(JUNIPER_MFR, "Juniper FRF.16 Frame Relay"), DLT_CHOICE(JUNIPER_ATM2, "Juniper ATM2 PIC"), DLT_CHOICE(JUNIPER_SERVICES, "Juniper Advanced Services PIC"), DLT_CHOICE(JUNIPER_ATM1, "Juniper ATM1 PIC"), DLT_CHOICE(APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"), DLT_CHOICE(MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"), DLT_CHOICE(MTP2, "SS7 MTP2"), DLT_CHOICE(MTP3, "SS7 MTP3"), DLT_CHOICE(SCCP, "SS7 SCCP"), DLT_CHOICE(DOCSIS, "DOCSIS"), DLT_CHOICE(LINUX_IRDA, "Linux IrDA"), DLT_CHOICE(IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"), DLT_CHOICE(JUNIPER_MONITOR, "Juniper Passive Monitor PIC"), DLT_CHOICE(BACNET_MS_TP, "BACnet MS/TP"), DLT_CHOICE(PPP_PPPD, "PPP for pppd, with direction flag"), DLT_CHOICE(JUNIPER_PPPOE, "Juniper PPPoE"), DLT_CHOICE(JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"), DLT_CHOICE(GPRS_LLC, "GPRS LLC"), DLT_CHOICE(GPF_T, "GPF-T"), DLT_CHOICE(GPF_F, "GPF-F"), DLT_CHOICE(JUNIPER_PIC_PEER, "Juniper PIC Peer"), DLT_CHOICE(ERF_ETH, "Ethernet with Endace ERF header"), DLT_CHOICE(ERF_POS, "Packet-over-SONET with Endace ERF header"), DLT_CHOICE(LINUX_LAPD, "Linux vISDN LAPD"), DLT_CHOICE(JUNIPER_ETHER, "Juniper Ethernet"), DLT_CHOICE(JUNIPER_PPP, "Juniper PPP"), DLT_CHOICE(JUNIPER_FRELAY, "Juniper Frame Relay"), DLT_CHOICE(JUNIPER_CHDLC, "Juniper C-HDLC"), DLT_CHOICE(MFR, "FRF.16 Frame Relay"), DLT_CHOICE(JUNIPER_VP, "Juniper Voice PIC"), DLT_CHOICE(A429, "Arinc 429"), DLT_CHOICE(A653_ICM, "Arinc 653 Interpartition Communication"), DLT_CHOICE(USB_FREEBSD, "USB with FreeBSD header"), DLT_CHOICE(BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"), DLT_CHOICE(IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"), DLT_CHOICE(USB_LINUX, "USB with Linux header"), DLT_CHOICE(CAN20B, "Controller Area Network (CAN) v. 2.0B"), DLT_CHOICE(IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"), DLT_CHOICE(PPI, "Per-Packet Information"), DLT_CHOICE(IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"), DLT_CHOICE(JUNIPER_ISM, "Juniper Integrated Service Module"), DLT_CHOICE(IEEE802_15_4, "IEEE 802.15.4 with FCS"), DLT_CHOICE(SITA, "SITA pseudo-header"), DLT_CHOICE(ERF, "Endace ERF header"), DLT_CHOICE(RAIF1, "Ethernet with u10 Networks pseudo-header"), DLT_CHOICE(IPMB_KONTRON, "IPMB with Kontron pseudo-header"), DLT_CHOICE(JUNIPER_ST, "Juniper Secure Tunnel"), DLT_CHOICE(BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"), DLT_CHOICE(AX25_KISS, "AX.25 with KISS header"), DLT_CHOICE(IPMB_LINUX, "IPMB with Linux/Pigeon Point pseudo-header"), DLT_CHOICE(IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"), DLT_CHOICE(MPLS, "MPLS with label as link-layer header"), DLT_CHOICE(LINUX_EVDEV, "Linux evdev events"), DLT_CHOICE(USB_LINUX_MMAPPED, "USB with padded Linux header"), DLT_CHOICE(DECT, "DECT"), DLT_CHOICE(AOS, "AOS Space Data Link protocol"), DLT_CHOICE(WIHART, "Wireless HART"), DLT_CHOICE(FC_2, "Fibre Channel FC-2"), DLT_CHOICE(FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"), DLT_CHOICE(IPNET, "Solaris ipnet"), DLT_CHOICE(CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"), DLT_CHOICE(IPV4, "Raw IPv4"), DLT_CHOICE(IPV6, "Raw IPv6"), DLT_CHOICE(IEEE802_15_4_NOFCS, "IEEE 802.15.4 without FCS"), DLT_CHOICE(DBUS, "D-Bus"), DLT_CHOICE(JUNIPER_VS, "Juniper Virtual Server"), DLT_CHOICE(JUNIPER_SRX_E2E, "Juniper SRX E2E"), DLT_CHOICE(JUNIPER_FIBRECHANNEL, "Juniper Fibre Channel"), DLT_CHOICE(DVB_CI, "DVB-CI"), DLT_CHOICE(MUX27010, "MUX27010"), DLT_CHOICE(STANAG_5066_D_PDU, "STANAG 5066 D_PDUs"), DLT_CHOICE(JUNIPER_ATM_CEMIC, "Juniper ATM CEMIC"), DLT_CHOICE(NFLOG, "Linux netfilter log messages"), DLT_CHOICE(NETANALYZER, "Ethernet with Hilscher netANALYZER pseudo-header"), DLT_CHOICE(NETANALYZER_TRANSPARENT, "Ethernet with Hilscher netANALYZER pseudo-header and with preamble and SFD"), DLT_CHOICE(IPOIB, "RFC 4391 IP-over-Infiniband"), DLT_CHOICE(MPEG_2_TS, "MPEG-2 transport stream"), DLT_CHOICE(NG40, "ng40 protocol tester Iub/Iur"), DLT_CHOICE(NFC_LLCP, "NFC LLCP PDUs with pseudo-header"), DLT_CHOICE(INFINIBAND, "InfiniBand"), DLT_CHOICE(SCTP, "SCTP"), DLT_CHOICE(USBPCAP, "USB with USBPcap header"), DLT_CHOICE(RTAC_SERIAL, "Schweitzer Engineering Laboratories RTAC packets"), DLT_CHOICE(BLUETOOTH_LE_LL, "Bluetooth Low Energy air interface"), DLT_CHOICE(NETLINK, "Linux netlink"), DLT_CHOICE(BLUETOOTH_LINUX_MONITOR, "Bluetooth Linux Monitor"), DLT_CHOICE(BLUETOOTH_BREDR_BB, "Bluetooth Basic Rate/Enhanced Data Rate baseband packets"), DLT_CHOICE(BLUETOOTH_LE_LL_WITH_PHDR, "Bluetooth Low Energy air interface with pseudo-header"), DLT_CHOICE(PROFIBUS_DL, "PROFIBUS data link layer"), DLT_CHOICE(PKTAP, "Apple DLT_PKTAP"), DLT_CHOICE(EPON, "Ethernet with 802.3 Clause 65 EPON preamble"), DLT_CHOICE(IPMI_HPM_2, "IPMI trace packets"), DLT_CHOICE(ZWAVE_R1_R2, "Z-Wave RF profile R1 and R2 packets"), DLT_CHOICE(ZWAVE_R3, "Z-Wave RF profile R3 packets"), DLT_CHOICE(WATTSTOPPER_DLM, "WattStopper Digital Lighting Management (DLM) and Legrand Nitoo Open protocol"), DLT_CHOICE(ISO_14443, "ISO 14443 messages"), DLT_CHOICE(RDS, "IEC 62106 Radio Data System groups"), DLT_CHOICE(USB_DARWIN, "USB with Darwin header"), DLT_CHOICE(OPENFLOW, "OpenBSD DLT_OPENFLOW"), DLT_CHOICE(SDLC, "IBM SDLC frames"), DLT_CHOICE(TI_LLN_SNIFFER, "TI LLN sniffer frames"), DLT_CHOICE(VSOCK, "Linux vsock"), DLT_CHOICE(NORDIC_BLE, "Nordic Semiconductor Bluetooth LE sniffer frames"), DLT_CHOICE(DOCSIS31_XRA31, "Excentis XRA-31 DOCSIS 3.1 RF sniffer frames"), DLT_CHOICE(ETHERNET_MPACKET, "802.3br mPackets"), DLT_CHOICE(DISPLAYPORT_AUX, "DisplayPort AUX channel monitoring data"), DLT_CHOICE(LINUX_SLL2, "Linux cooked v2"), DLT_CHOICE(OPENVIZSLA, "OpenVizsla USB"), DLT_CHOICE(EBHSCR, "Elektrobit High Speed Capture and Replay (EBHSCR)"), DLT_CHOICE(VPP_DISPATCH, "VPP graph dispatch tracer"), DLT_CHOICE(DSA_TAG_BRCM, "Broadcom tag"), DLT_CHOICE(DSA_TAG_BRCM_PREPEND, "Broadcom tag (prepended)"), DLT_CHOICE(IEEE802_15_4_TAP, "IEEE 802.15.4 with pseudo-header"), DLT_CHOICE(DSA_TAG_DSA, "Marvell DSA"), DLT_CHOICE(DSA_TAG_EDSA, "Marvell EDSA"), DLT_CHOICE(ELEE, "ELEE lawful intercept packets"), DLT_CHOICE(Z_WAVE_SERIAL, "Z-Wave serial frames between host and chip"), DLT_CHOICE(USB_2_0, "USB 2.0/1.1/1.0 as transmitted over the cable"), DLT_CHOICE(ATSC_ALP, "ATSC Link-Layer Protocol packets"), DLT_CHOICE_SENTINEL }; int pcap_datalink_name_to_val(const char *name) { int i; for (i = 0; dlt_choices[i].name != NULL; i++) { if (pcap_strcasecmp(dlt_choices[i].name, name) == 0) return (dlt_choices[i].dlt); } return (-1); } const char * pcap_datalink_val_to_name(int dlt) { int i; for (i = 0; dlt_choices[i].name != NULL; i++) { if (dlt_choices[i].dlt == dlt) return (dlt_choices[i].name); } return (NULL); } const char * pcap_datalink_val_to_description(int dlt) { int i; for (i = 0; dlt_choices[i].name != NULL; i++) { if (dlt_choices[i].dlt == dlt) return (dlt_choices[i].description); } return (NULL); } const char * pcap_datalink_val_to_description_or_dlt(int dlt) { static char unkbuf[40]; const char *description; description = pcap_datalink_val_to_description(dlt); if (description != NULL) { return description; } else { (void)snprintf(unkbuf, sizeof(unkbuf), "DLT %d", dlt); return unkbuf; } } struct tstamp_type_choice { const char *name; const char *description; int type; }; static struct tstamp_type_choice tstamp_type_choices[] = { { "host", "Host", PCAP_TSTAMP_HOST }, { "host_lowprec", "Host, low precision", PCAP_TSTAMP_HOST_LOWPREC }, { "host_hiprec", "Host, high precision", PCAP_TSTAMP_HOST_HIPREC }, { "adapter", "Adapter", PCAP_TSTAMP_ADAPTER }, { "adapter_unsynced", "Adapter, not synced with system time", PCAP_TSTAMP_ADAPTER_UNSYNCED }, { "host_hiprec_unsynced", "Host, high precision, not synced with system time", PCAP_TSTAMP_HOST_HIPREC_UNSYNCED }, { NULL, NULL, 0 } }; int pcap_tstamp_type_name_to_val(const char *name) { int i; for (i = 0; tstamp_type_choices[i].name != NULL; i++) { if (pcap_strcasecmp(tstamp_type_choices[i].name, name) == 0) return (tstamp_type_choices[i].type); } return (PCAP_ERROR); } const char * pcap_tstamp_type_val_to_name(int tstamp_type) { int i; for (i = 0; tstamp_type_choices[i].name != NULL; i++) { if (tstamp_type_choices[i].type == tstamp_type) return (tstamp_type_choices[i].name); } return (NULL); } const char * pcap_tstamp_type_val_to_description(int tstamp_type) { int i; for (i = 0; tstamp_type_choices[i].name != NULL; i++) { if (tstamp_type_choices[i].type == tstamp_type) return (tstamp_type_choices[i].description); } return (NULL); } int pcap_snapshot(pcap_t *p) { if (!p->activated) return (PCAP_ERROR_NOT_ACTIVATED); return (p->snapshot); } int pcap_is_swapped(pcap_t *p) { if (!p->activated) return (PCAP_ERROR_NOT_ACTIVATED); return (p->swapped); } int pcap_major_version(pcap_t *p) { if (!p->activated) return (PCAP_ERROR_NOT_ACTIVATED); return (p->version_major); } int pcap_minor_version(pcap_t *p) { if (!p->activated) return (PCAP_ERROR_NOT_ACTIVATED); return (p->version_minor); } int pcap_bufsize(pcap_t *p) { if (!p->activated) return (PCAP_ERROR_NOT_ACTIVATED); return (p->bufsize); } FILE * pcap_file(pcap_t *p) { return (p->rfile); } #ifdef _WIN32 int pcap_fileno(pcap_t *p) { if (p->handle != INVALID_HANDLE_VALUE) { /* * This is a bogus and now-deprecated API; we * squelch the narrowing warning for the cast * from HANDLE to intptr_t. If Windows programmmers * need to get at the HANDLE for a pcap_t, *if* * there is one, they should request such a * routine (and be prepared for it to return * INVALID_HANDLE_VALUE). */ DIAG_OFF_NARROWING return ((int)(intptr_t)p->handle); DIAG_ON_NARROWING } else return (PCAP_ERROR); } #else /* _WIN32 */ int pcap_fileno(pcap_t *p) { return (p->fd); } #endif /* _WIN32 */ #if !defined(_WIN32) && !defined(MSDOS) int pcap_get_selectable_fd(pcap_t *p) { return (p->selectable_fd); } const struct timeval * pcap_get_required_select_timeout(pcap_t *p) { return (p->required_select_timeout); } #endif void pcap_perror(pcap_t *p, const char *prefix) { fprintf(stderr, "%s: %s\n", prefix, p->errbuf); } char * pcap_geterr(pcap_t *p) { return (p->errbuf); } int pcap_getnonblock(pcap_t *p, char *errbuf) { int ret; ret = p->getnonblock_op(p); if (ret == -1) { /* * The get nonblock operation sets p->errbuf; this * function *shouldn't* have had a separate errbuf * argument, as it didn't need one, but I goofed * when adding it. * * We copy the error message to errbuf, so callers * can find it in either place. */ pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE); } return (ret); } /* * Get the current non-blocking mode setting, under the assumption that * it's just the standard POSIX non-blocking flag. */ #if !defined(_WIN32) && !defined(MSDOS) int pcap_getnonblock_fd(pcap_t *p) { int fdflags; fdflags = fcntl(p->fd, F_GETFL, 0); if (fdflags == -1) { pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, errno, "F_GETFL"); return (-1); } if (fdflags & O_NONBLOCK) return (1); else return (0); } #endif int pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf) { int ret; ret = p->setnonblock_op(p, nonblock); if (ret == -1) { /* * The set nonblock operation sets p->errbuf; this * function *shouldn't* have had a separate errbuf * argument, as it didn't need one, but I goofed * when adding it. * * We copy the error message to errbuf, so callers * can find it in either place. */ pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE); } return (ret); } #if !defined(_WIN32) && !defined(MSDOS) /* * Set non-blocking mode, under the assumption that it's just the * standard POSIX non-blocking flag. (This can be called by the * per-platform non-blocking-mode routine if that routine also * needs to do some additional work.) */ int pcap_setnonblock_fd(pcap_t *p, int nonblock) { int fdflags; fdflags = fcntl(p->fd, F_GETFL, 0); if (fdflags == -1) { pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, errno, "F_GETFL"); return (-1); } if (nonblock) fdflags |= O_NONBLOCK; else fdflags &= ~O_NONBLOCK; if (fcntl(p->fd, F_SETFL, fdflags) == -1) { pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, errno, "F_SETFL"); return (-1); } return (0); } #endif /* * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values. */ const char * pcap_statustostr(int errnum) { static char ebuf[15+10+1]; switch (errnum) { case PCAP_WARNING: return("Generic warning"); case PCAP_WARNING_TSTAMP_TYPE_NOTSUP: return ("That type of time stamp is not supported by that device"); case PCAP_WARNING_PROMISC_NOTSUP: return ("That device doesn't support promiscuous mode"); case PCAP_ERROR: return("Generic error"); case PCAP_ERROR_BREAK: return("Loop terminated by pcap_breakloop"); case PCAP_ERROR_NOT_ACTIVATED: return("The pcap_t has not been activated"); case PCAP_ERROR_ACTIVATED: return ("The setting can't be changed after the pcap_t is activated"); case PCAP_ERROR_NO_SUCH_DEVICE: return ("No such device exists"); case PCAP_ERROR_RFMON_NOTSUP: return ("That device doesn't support monitor mode"); case PCAP_ERROR_NOT_RFMON: return ("That operation is supported only in monitor mode"); case PCAP_ERROR_PERM_DENIED: return ("You don't have permission to perform this capture on that device"); case PCAP_ERROR_IFACE_NOT_UP: return ("That device is not up"); case PCAP_ERROR_CANTSET_TSTAMP_TYPE: return ("That device doesn't support setting the time stamp type"); case PCAP_ERROR_PROMISC_PERM_DENIED: return ("You don't have permission to capture in promiscuous mode on that device"); case PCAP_ERROR_TSTAMP_PRECISION_NOTSUP: return ("That device doesn't support that time stamp precision"); } (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum); return(ebuf); } /* * Not all systems have strerror(). */ const char * pcap_strerror(int errnum) { #ifdef HAVE_STRERROR #ifdef _WIN32 static char errbuf[PCAP_ERRBUF_SIZE]; errno_t err = strerror_s(errbuf, PCAP_ERRBUF_SIZE, errnum); if (err != 0) /* err = 0 if successful */ pcap_strlcpy(errbuf, "strerror_s() error", PCAP_ERRBUF_SIZE); return (errbuf); #else return (strerror(errnum)); #endif /* _WIN32 */ #else extern int sys_nerr; extern const char *const sys_errlist[]; static char errbuf[PCAP_ERRBUF_SIZE]; if ((unsigned int)errnum < sys_nerr) return ((char *)sys_errlist[errnum]); (void)snprintf(errbuf, sizeof errbuf, "Unknown error: %d", errnum); return (errbuf); #endif } int pcap_setfilter(pcap_t *p, struct bpf_program *fp) { return (p->setfilter_op(p, fp)); } /* * Set direction flag, which controls whether we accept only incoming * packets, only outgoing packets, or both. * Note that, depending on the platform, some or all direction arguments * might not be supported. */ int pcap_setdirection(pcap_t *p, pcap_direction_t d) { if (p->setdirection_op == NULL) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Setting direction is not supported on this device"); return (-1); } else { switch (d) { case PCAP_D_IN: case PCAP_D_OUT: case PCAP_D_INOUT: /* * Valid direction. */ return (p->setdirection_op(p, d)); default: /* * Invalid direction. */ snprintf(p->errbuf, sizeof(p->errbuf), "Invalid direction"); return (-1); } } } int pcap_stats(pcap_t *p, struct pcap_stat *ps) { return (p->stats_op(p, ps)); } #ifdef _WIN32 struct pcap_stat * pcap_stats_ex(pcap_t *p, int *pcap_stat_size) { return (p->stats_ex_op(p, pcap_stat_size)); } int pcap_setbuff(pcap_t *p, int dim) { return (p->setbuff_op(p, dim)); } int pcap_setmode(pcap_t *p, int mode) { return (p->setmode_op(p, mode)); } int pcap_setmintocopy(pcap_t *p, int size) { return (p->setmintocopy_op(p, size)); } HANDLE pcap_getevent(pcap_t *p) { return (p->getevent_op(p)); } int pcap_oid_get_request(pcap_t *p, bpf_u_int32 oid, void *data, size_t *lenp) { return (p->oid_get_request_op(p, oid, data, lenp)); } int pcap_oid_set_request(pcap_t *p, bpf_u_int32 oid, const void *data, size_t *lenp) { return (p->oid_set_request_op(p, oid, data, lenp)); } pcap_send_queue * pcap_sendqueue_alloc(u_int memsize) { pcap_send_queue *tqueue; /* Allocate the queue */ tqueue = (pcap_send_queue *)malloc(sizeof(pcap_send_queue)); if (tqueue == NULL){ return (NULL); } /* Allocate the buffer */ tqueue->buffer = (char *)malloc(memsize); if (tqueue->buffer == NULL) { free(tqueue); return (NULL); } tqueue->maxlen = memsize; tqueue->len = 0; return (tqueue); } void pcap_sendqueue_destroy(pcap_send_queue *queue) { free(queue->buffer); free(queue); } int pcap_sendqueue_queue(pcap_send_queue *queue, const struct pcap_pkthdr *pkt_header, const u_char *pkt_data) { if (queue->len + sizeof(struct pcap_pkthdr) + pkt_header->caplen > queue->maxlen){ return (-1); } /* Copy the pcap_pkthdr header*/ memcpy(queue->buffer + queue->len, pkt_header, sizeof(struct pcap_pkthdr)); queue->len += sizeof(struct pcap_pkthdr); /* copy the packet */ memcpy(queue->buffer + queue->len, pkt_data, pkt_header->caplen); queue->len += pkt_header->caplen; return (0); } u_int pcap_sendqueue_transmit(pcap_t *p, pcap_send_queue *queue, int sync) { return (p->sendqueue_transmit_op(p, queue, sync)); } int pcap_setuserbuffer(pcap_t *p, int size) { return (p->setuserbuffer_op(p, size)); } int pcap_live_dump(pcap_t *p, char *filename, int maxsize, int maxpacks) { return (p->live_dump_op(p, filename, maxsize, maxpacks)); } int pcap_live_dump_ended(pcap_t *p, int sync) { return (p->live_dump_ended_op(p, sync)); } PAirpcapHandle pcap_get_airpcap_handle(pcap_t *p) { PAirpcapHandle handle; handle = p->get_airpcap_handle_op(p); if (handle == NULL) { (void)snprintf(p->errbuf, sizeof(p->errbuf), "This isn't an AirPcap device"); } return (handle); } #endif /* * On some platforms, we need to clean up promiscuous or monitor mode * when we close a device - and we want that to happen even if the * application just exits without explicitl closing devices. * On those platforms, we need to register a "close all the pcaps" * routine to be called when we exit, and need to maintain a list of * pcaps that need to be closed to clean up modes. * * XXX - not thread-safe. */ /* * List of pcaps on which we've done something that needs to be * cleaned up. * If there are any such pcaps, we arrange to call "pcap_close_all()" * when we exit, and have it close all of them. */ static struct pcap *pcaps_to_close; /* * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to * be called on exit. */ static int did_atexit; static void pcap_close_all(void) { struct pcap *handle; while ((handle = pcaps_to_close) != NULL) { pcap_close(handle); /* * If a pcap module adds a pcap_t to the "close all" * list by calling pcap_add_to_pcaps_to_close(), it * must have a cleanup routine that removes it from the * list, by calling pcap_remove_from_pcaps_to_close(), * and must make that cleanup routine the cleanup_op * for the pcap_t. * * That means that, after pcap_close() - which calls * the cleanup_op for the pcap_t - the pcap_t must * have been removed from the list, so pcaps_to_close * must not be equal to handle. * * We check for that, and abort if handle is still * at the head of the list, to prevent infinite loops. */ if (pcaps_to_close == handle) abort(); } } int pcap_do_addexit(pcap_t *p) { /* * If we haven't already done so, arrange to have * "pcap_close_all()" called when we exit. */ if (!did_atexit) { if (atexit(pcap_close_all) != 0) { /* * "atexit()" failed; let our caller know. */ pcap_strlcpy(p->errbuf, "atexit failed", PCAP_ERRBUF_SIZE); return (0); } did_atexit = 1; } return (1); } void pcap_add_to_pcaps_to_close(pcap_t *p) { p->next = pcaps_to_close; pcaps_to_close = p; } void pcap_remove_from_pcaps_to_close(pcap_t *p) { pcap_t *pc, *prevpc; for (pc = pcaps_to_close, prevpc = NULL; pc != NULL; prevpc = pc, pc = pc->next) { if (pc == p) { /* * Found it. Remove it from the list. */ if (prevpc == NULL) { /* * It was at the head of the list. */ pcaps_to_close = pc->next; } else { /* * It was in the middle of the list. */ prevpc->next = pc->next; } break; } } } void pcap_breakloop_common(pcap_t *p) { p->break_loop = 1; } void pcap_cleanup_live_common(pcap_t *p) { if (p->opt.device != NULL) { free(p->opt.device); p->opt.device = NULL; } if (p->buffer != NULL) { free(p->buffer); p->buffer = NULL; } if (p->dlt_list != NULL) { free(p->dlt_list); p->dlt_list = NULL; p->dlt_count = 0; } if (p->tstamp_type_list != NULL) { free(p->tstamp_type_list); p->tstamp_type_list = NULL; p->tstamp_type_count = 0; } if (p->tstamp_precision_list != NULL) { free(p->tstamp_precision_list); p->tstamp_precision_list = NULL; p->tstamp_precision_count = 0; } pcap_freecode(&p->fcode); #if !defined(_WIN32) && !defined(MSDOS) if (p->fd >= 0) { close(p->fd); p->fd = -1; } p->selectable_fd = -1; #endif } /* * API compatible with WinPcap's "send a packet" routine - returns -1 * on error, 0 otherwise. * * XXX - what if we get a short write? */ int pcap_sendpacket(pcap_t *p, const u_char *buf, int size) { if (size <= 0) { pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, errno, "The number of bytes to be sent must be positive"); return (PCAP_ERROR); } if (p->inject_op(p, buf, size) == -1) return (-1); return (0); } /* * API compatible with OpenBSD's "send a packet" routine - returns -1 on * error, number of bytes written otherwise. */ int pcap_inject(pcap_t *p, const void *buf, size_t size) { /* * We return the number of bytes written, so the number of * bytes to write must fit in an int. */ if (size > INT_MAX) { pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, errno, "More than %d bytes cannot be injected", INT_MAX); return (PCAP_ERROR); } if (size == 0) { pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, errno, "The number of bytes to be injected must not be zero"); return (PCAP_ERROR); } return (p->inject_op(p, buf, size)); } void pcap_close(pcap_t *p) { p->cleanup_op(p); free(p); } /* * Helpers for safely loading code at run time. * Currently Windows-only. */ #ifdef _WIN32 // // This wrapper around loadlibrary appends the system folder (usually // C:\Windows\System32) to the relative path of the DLL, so that the DLL // is always loaded from an absolute path (it's no longer possible to // load modules from the application folder). // This solves the DLL Hijacking issue discovered in August 2010: // // https://blog.rapid7.com/2010/08/23/exploiting-dll-hijacking-flaws/ // https://blog.rapid7.com/2010/08/23/application-dll-load-hijacking/ // (the purported Rapid7 blog post link in the first of those two links // is broken; the second of those links works.) // // If any links there are broken from all the content shuffling Rapid& // did, see archived versions of the posts at their original homes, at // // https://web.archive.org/web/20110122175058/http://blog.metasploit.com/2010/08/exploiting-dll-hijacking-flaws.html // https://web.archive.org/web/20100828112111/http://blog.rapid7.com/?p=5325 // pcap_code_handle_t pcap_load_code(const char *name) { /* * XXX - should this work in UTF-16LE rather than in the local * ANSI code page? */ CHAR path[MAX_PATH]; CHAR fullFileName[MAX_PATH]; UINT res; HMODULE hModule = NULL; do { res = GetSystemDirectoryA(path, MAX_PATH); if (res == 0) { // // some bad failure occurred; // break; } if (res > MAX_PATH) { // // the buffer was not big enough // SetLastError(ERROR_INSUFFICIENT_BUFFER); break; } if (res + 1 + strlen(name) + 1 < MAX_PATH) { memcpy(fullFileName, path, res * sizeof(TCHAR)); fullFileName[res] = '\\'; memcpy(&fullFileName[res + 1], name, (strlen(name) + 1) * sizeof(TCHAR)); hModule = LoadLibraryA(fullFileName); } else SetLastError(ERROR_INSUFFICIENT_BUFFER); } while(FALSE); return hModule; } pcap_funcptr_t pcap_find_function(pcap_code_handle_t code, const char *func) { return (GetProcAddress(code, func)); } #endif /* * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw * data for the packet, check whether the packet passes the filter. * Returns the return value of the filter program, which will be zero if * the packet doesn't pass and non-zero if the packet does pass. */ int pcap_offline_filter(const struct bpf_program *fp, const struct pcap_pkthdr *h, const u_char *pkt) { const struct bpf_insn *fcode = fp->bf_insns; if (fcode != NULL) return (pcap_filter(fcode, pkt, h->len, h->caplen)); else return (0); } static int pcap_can_set_rfmon_dead(pcap_t *p) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Rfmon mode doesn't apply on a pcap_open_dead pcap_t"); return (PCAP_ERROR); } static int pcap_read_dead(pcap_t *p, int cnt _U_, pcap_handler callback _U_, u_char *user _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Packets aren't available from a pcap_open_dead pcap_t"); return (-1); } static void pcap_breakloop_dead(pcap_t *p _U_) { /* * A "dead" pcap_t is just a placeholder to use in order to * compile a filter to BPF code or to open a savefile for * writing. It doesn't support any operations, including * capturing or reading packets, so there will never be a * get-packets loop in progress to break out *of*. * * As such, this routine doesn't need to do anything. */ } static int pcap_inject_dead(pcap_t *p, const void *buf _U_, size_t size _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Packets can't be sent on a pcap_open_dead pcap_t"); return (-1); } static int pcap_setfilter_dead(pcap_t *p, struct bpf_program *fp _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "A filter cannot be set on a pcap_open_dead pcap_t"); return (-1); } static int pcap_setdirection_dead(pcap_t *p, pcap_direction_t d _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "The packet direction cannot be set on a pcap_open_dead pcap_t"); return (-1); } static int pcap_set_datalink_dead(pcap_t *p, int dlt _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "The link-layer header type cannot be set on a pcap_open_dead pcap_t"); return (-1); } static int pcap_getnonblock_dead(pcap_t *p) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "A pcap_open_dead pcap_t does not have a non-blocking mode setting"); return (-1); } static int pcap_setnonblock_dead(pcap_t *p, int nonblock _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "A pcap_open_dead pcap_t does not have a non-blocking mode setting"); return (-1); } static int pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Statistics aren't available from a pcap_open_dead pcap_t"); return (-1); } #ifdef _WIN32 static struct pcap_stat * pcap_stats_ex_dead(pcap_t *p, int *pcap_stat_size _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Statistics aren't available from a pcap_open_dead pcap_t"); return (NULL); } static int pcap_setbuff_dead(pcap_t *p, int dim _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "The kernel buffer size cannot be set on a pcap_open_dead pcap_t"); return (-1); } static int pcap_setmode_dead(pcap_t *p, int mode _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "impossible to set mode on a pcap_open_dead pcap_t"); return (-1); } static int pcap_setmintocopy_dead(pcap_t *p, int size _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t"); return (-1); } static HANDLE pcap_getevent_dead(pcap_t *p) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "A pcap_open_dead pcap_t has no event handle"); return (INVALID_HANDLE_VALUE); } static int pcap_oid_get_request_dead(pcap_t *p, bpf_u_int32 oid _U_, void *data _U_, size_t *lenp _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "An OID get request cannot be performed on a pcap_open_dead pcap_t"); return (PCAP_ERROR); } static int pcap_oid_set_request_dead(pcap_t *p, bpf_u_int32 oid _U_, const void *data _U_, size_t *lenp _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "An OID set request cannot be performed on a pcap_open_dead pcap_t"); return (PCAP_ERROR); } static u_int pcap_sendqueue_transmit_dead(pcap_t *p, pcap_send_queue *queue _U_, int sync _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Packets cannot be transmitted on a pcap_open_dead pcap_t"); return (0); } static int pcap_setuserbuffer_dead(pcap_t *p, int size _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "The user buffer cannot be set on a pcap_open_dead pcap_t"); return (-1); } static int pcap_live_dump_dead(pcap_t *p, char *filename _U_, int maxsize _U_, int maxpacks _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Live packet dumping cannot be performed on a pcap_open_dead pcap_t"); return (-1); } static int pcap_live_dump_ended_dead(pcap_t *p, int sync _U_) { snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Live packet dumping cannot be performed on a pcap_open_dead pcap_t"); return (-1); } static PAirpcapHandle pcap_get_airpcap_handle_dead(pcap_t *p _U_) { return (NULL); } #endif /* _WIN32 */ static void pcap_cleanup_dead(pcap_t *p _U_) { /* Nothing to do. */ } pcap_t * pcap_open_dead_with_tstamp_precision(int linktype, int snaplen, u_int precision) { pcap_t *p; switch (precision) { case PCAP_TSTAMP_PRECISION_MICRO: case PCAP_TSTAMP_PRECISION_NANO: break; default: /* * This doesn't really matter, but we don't have any way * to report particular errors, so the only failure we * should have is a memory allocation failure. Just * pick microsecond precision. */ precision = PCAP_TSTAMP_PRECISION_MICRO; break; } p = malloc(sizeof(*p)); if (p == NULL) return NULL; memset (p, 0, sizeof(*p)); p->snapshot = snaplen; p->linktype = linktype; p->opt.tstamp_precision = precision; p->can_set_rfmon_op = pcap_can_set_rfmon_dead; p->read_op = pcap_read_dead; p->inject_op = pcap_inject_dead; p->setfilter_op = pcap_setfilter_dead; p->setdirection_op = pcap_setdirection_dead; p->set_datalink_op = pcap_set_datalink_dead; p->getnonblock_op = pcap_getnonblock_dead; p->setnonblock_op = pcap_setnonblock_dead; p->stats_op = pcap_stats_dead; #ifdef _WIN32 p->stats_ex_op = pcap_stats_ex_dead; p->setbuff_op = pcap_setbuff_dead; p->setmode_op = pcap_setmode_dead; p->setmintocopy_op = pcap_setmintocopy_dead; p->getevent_op = pcap_getevent_dead; p->oid_get_request_op = pcap_oid_get_request_dead; p->oid_set_request_op = pcap_oid_set_request_dead; p->sendqueue_transmit_op = pcap_sendqueue_transmit_dead; p->setuserbuffer_op = pcap_setuserbuffer_dead; p->live_dump_op = pcap_live_dump_dead; p->live_dump_ended_op = pcap_live_dump_ended_dead; p->get_airpcap_handle_op = pcap_get_airpcap_handle_dead; #endif p->breakloop_op = pcap_breakloop_dead; p->cleanup_op = pcap_cleanup_dead; /* * A "dead" pcap_t never requires special BPF code generation. */ p->bpf_codegen_flags = 0; p->activated = 1; return (p); } pcap_t * pcap_open_dead(int linktype, int snaplen) { return (pcap_open_dead_with_tstamp_precision(linktype, snaplen, PCAP_TSTAMP_PRECISION_MICRO)); } #ifdef YYDEBUG /* * Set the internal "debug printout" flag for the filter expression parser. * The code to print that stuff is present only if YYDEBUG is defined, so * the flag, and the routine to set it, are defined only if YYDEBUG is * defined. * * This is intended for libpcap developers, not for general use. * If you want to set these in a program, you'll have to declare this * routine yourself, with the appropriate DLL import attribute on Windows; * it's not declared in any header file, and won't be declared in any * header file provided by libpcap. */ PCAP_API void pcap_set_parser_debug(int value); PCAP_API_DEF void pcap_set_parser_debug(int value) { pcap_debug = value; } #endif