+#else /* HAVE_FORK && HAVE_VFORK */
+static void
+compress_savefile(const char *filename)
+{
+ fprintf(stderr,
+ "compress_savefile failed. Functionality not implemented under your system\n");
+}
+#endif /* HAVE_FORK && HAVE_VFORK */
+
+static void
+dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
+{
+ struct dump_info *dump_info;
+
+ ++packets_captured;
+
+ ++infodelay;
+
+ dump_info = (struct dump_info *)user;
+
+ /*
+ * XXX - this won't force the file to rotate on the specified time
+ * boundary, but it will rotate on the first packet received after the
+ * specified Gflag number of seconds. Note: if a Gflag time boundary
+ * and a Cflag size boundary coincide, the time rotation will occur
+ * first thereby cancelling the Cflag boundary (since the file should
+ * be 0).
+ */
+ if (Gflag != 0) {
+ /* Check if it is time to rotate */
+ time_t t;
+
+ /* Get the current time */
+ if ((t = time(NULL)) == (time_t)-1) {
+ error("dump_and_trunc_packet: can't get current_time: %s",
+ pcap_strerror(errno));
+ }
+
+
+ /* If the time is greater than the specified window, rotate */
+ if (t - Gflag_time >= Gflag) {
+#ifdef HAVE_CAPSICUM
+ FILE *fp;
+ int fd;
+#endif
+
+ /* Update the Gflag_time */
+ Gflag_time = t;
+ /* Update Gflag_count */
+ Gflag_count++;
+ /*
+ * Close the current file and open a new one.
+ */
+ pcap_dump_close(dump_info->p);
+
+ /*
+ * Compress the file we just closed, if the user asked for it
+ */
+ if (zflag != NULL)
+ compress_savefile(dump_info->CurrentFileName);
+
+ /*
+ * Check to see if we've exceeded the Wflag (when
+ * not using Cflag).
+ */
+ if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
+ (void)fprintf(stderr, "Maximum file limit reached: %d\n",
+ Wflag);
+ exit(0);
+ /* NOTREACHED */
+ }
+ if (dump_info->CurrentFileName != NULL)
+ free(dump_info->CurrentFileName);
+ /* Allocate space for max filename + \0. */
+ dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
+ if (dump_info->CurrentFileName == NULL)
+ error("dump_packet_and_trunc: malloc");
+ /*
+ * Gflag was set otherwise we wouldn't be here. Reset the count
+ * so multiple files would end with 1,2,3 in the filename.
+ * The counting is handled with the -C flow after this.
+ */
+ Cflag_count = 0;
+
+ /*
+ * This is always the first file in the Cflag
+ * rotation: e.g. 0
+ * We also don't need numbering if Cflag is not set.
+ */
+ if (Cflag != 0)
+ MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
+ WflagChars);
+ else
+ MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
+
+#ifdef HAVE_LIBCAP_NG
+ capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
+ capng_apply(CAPNG_SELECT_BOTH);
+#endif /* HAVE_LIBCAP_NG */
+#ifdef HAVE_CAPSICUM
+ fd = openat(dump_info->dirfd,
+ dump_info->CurrentFileName,
+ O_CREAT | O_WRONLY | O_TRUNC, 0644);
+ if (fd < 0) {
+ error("unable to open file %s",
+ dump_info->CurrentFileName);
+ }
+ fp = fdopen(fd, "w");
+ if (fp == NULL) {
+ error("unable to fdopen file %s",
+ dump_info->CurrentFileName);
+ }
+ dump_info->p = pcap_dump_fopen(dump_info->pd, fp);
+#else /* !HAVE_CAPSICUM */
+ dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
+#endif
+#ifdef HAVE_LIBCAP_NG
+ capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
+ capng_apply(CAPNG_SELECT_BOTH);
+#endif /* HAVE_LIBCAP_NG */
+ if (dump_info->p == NULL)
+ error("%s", pcap_geterr(pd));
+#ifdef HAVE_CAPSICUM
+ set_dumper_capsicum_rights(dump_info->p);
+#endif
+ }
+ }
+
+ /*
+ * XXX - this won't prevent capture files from getting
+ * larger than Cflag - the last packet written to the
+ * file could put it over Cflag.
+ */
+ if (Cflag != 0) {
+ long size = pcap_dump_ftell(dump_info->p);
+
+ if (size == -1)
+ error("ftell fails on output file");
+ if (size > Cflag) {
+#ifdef HAVE_CAPSICUM
+ FILE *fp;
+ int fd;
+#endif
+
+ /*
+ * Close the current file and open a new one.
+ */
+ pcap_dump_close(dump_info->p);
+
+ /*
+ * Compress the file we just closed, if the user
+ * asked for it.
+ */
+ if (zflag != NULL)
+ compress_savefile(dump_info->CurrentFileName);
+
+ Cflag_count++;
+ if (Wflag > 0) {
+ if (Cflag_count >= Wflag)
+ Cflag_count = 0;
+ }
+ if (dump_info->CurrentFileName != NULL)
+ free(dump_info->CurrentFileName);
+ dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
+ if (dump_info->CurrentFileName == NULL)
+ error("dump_packet_and_trunc: malloc");
+ MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
+#ifdef HAVE_LIBCAP_NG
+ capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
+ capng_apply(CAPNG_SELECT_BOTH);
+#endif /* HAVE_LIBCAP_NG */
+#ifdef HAVE_CAPSICUM
+ fd = openat(dump_info->dirfd, dump_info->CurrentFileName,
+ O_CREAT | O_WRONLY | O_TRUNC, 0644);
+ if (fd < 0) {
+ error("unable to open file %s",
+ dump_info->CurrentFileName);
+ }
+ fp = fdopen(fd, "w");
+ if (fp == NULL) {
+ error("unable to fdopen file %s",
+ dump_info->CurrentFileName);
+ }
+ dump_info->p = pcap_dump_fopen(dump_info->pd, fp);
+#else /* !HAVE_CAPSICUM */
+ dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
+#endif
+#ifdef HAVE_LIBCAP_NG
+ capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
+ capng_apply(CAPNG_SELECT_BOTH);
+#endif /* HAVE_LIBCAP_NG */
+ if (dump_info->p == NULL)
+ error("%s", pcap_geterr(pd));
+#ifdef HAVE_CAPSICUM
+ set_dumper_capsicum_rights(dump_info->p);
+#endif
+ }
+ }
+
+ pcap_dump((u_char *)dump_info->p, h, sp);
+#ifdef HAVE_PCAP_DUMP_FLUSH
+ if (Uflag)
+ pcap_dump_flush(dump_info->p);
+#endif
+
+ --infodelay;
+ if (infoprint)
+ info(0);
+}
+
+static void
+dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
+{
+ ++packets_captured;
+
+ ++infodelay;
+
+ pcap_dump(user, h, sp);
+#ifdef HAVE_PCAP_DUMP_FLUSH
+ if (Uflag)
+ pcap_dump_flush((pcap_dumper_t *)user);
+#endif
+
+ --infodelay;
+ if (infoprint)
+ info(0);
+}
+
+static void
+print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
+{
+ ++packets_captured;
+
+ ++infodelay;
+
+ pretty_print_packet((netdissect_options *)user, h, sp, packets_captured);
+
+ --infodelay;
+ if (infoprint)
+ info(0);
+}
+
+#ifdef _WIN32
+ /*
+ * XXX - there should really be libpcap calls to get the version
+ * number as a string (the string would be generated from #defines
+ * at run time, so that it's not generated from string constants
+ * in the library, as, on many UNIX systems, those constants would
+ * be statically linked into the application executable image, and
+ * would thus reflect the version of libpcap on the system on
+ * which the application was *linked*, not the system on which it's
+ * *running*.
+ *
+ * That routine should be documented, unlike the "version[]"
+ * string, so that UNIX vendors providing their own libpcaps
+ * don't omit it (as a couple of vendors have...).
+ *
+ * Packet.dll should perhaps also export a routine to return the
+ * version number of the Packet.dll code, to supply the
+ * "Wpcap_version" information on Windows.
+ */
+ char WDversion[]="current-git.tcpdump.org";
+#if !defined(HAVE_GENERATED_VERSION)
+ char version[]="current-git.tcpdump.org";
+#endif
+ char pcap_version[]="current-git.tcpdump.org";
+ char Wpcap_version[]="3.1";
+#endif
+
+#ifdef SIGNAL_REQ_INFO
+RETSIGTYPE requestinfo(int signo _U_)
+{
+ if (infodelay)
+ ++infoprint;
+ else
+ info(0);
+}
+#endif
projects / tcpdump / blobdiff