+/*
+ * Copy arg vector into a new buffer, concatenating arguments with spaces.
+ */
+static char *
+copy_argv(register char **argv)
+{
+ register char **p;
+ register u_int len = 0;
+ char *buf;
+ char *src, *dst;
+
+ p = argv;
+ if (*p == NULL)
+ return 0;
+
+ while (*p)
+ len += strlen(*p++) + 1;
+
+ buf = (char *)malloc(len);
+ if (buf == NULL)
+ error("copy_argv: malloc");
+
+ p = argv;
+ dst = buf;
+ while ((src = *p++) != NULL) {
+ while ((*dst++ = *src++) != '\0')
+ ;
+ dst[-1] = ' ';
+ }
+ dst[-1] = '\0';
+
+ return buf;
+}
+
+/*
+ * On Windows, we need to open the file in binary mode, so that
+ * we get all the bytes specified by the size we get from "fstat()".
+ * On UNIX, that's not necessary. O_BINARY is defined on Windows;
+ * we define it as 0 if it's not defined, so it does nothing.
+ */
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+static char *
+read_infile(char *fname)
+{
+ register int i, fd, cc;
+ register char *cp;
+ our_statb buf;
+
+ fd = open(fname, O_RDONLY|O_BINARY);
+ if (fd < 0)
+ error("can't open %s: %s", fname, pcap_strerror(errno));
+
+ if (our_fstat(fd, &buf) < 0)
+ error("can't stat %s: %s", fname, pcap_strerror(errno));
+
+ /*
+ * Reject files whose size doesn't fit into an int; a filter
+ * *that* large will probably be too big.
+ */
+ if (buf.st_size > INT_MAX)
+ error("%s is too large", fname);
+
+ cp = malloc((u_int)buf.st_size + 1);
+ if (cp == NULL)
+ error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
+ fname, pcap_strerror(errno));
+ cc = read(fd, cp, (u_int)buf.st_size);
+ if (cc < 0)
+ error("read %s: %s", fname, pcap_strerror(errno));
+ if (cc != buf.st_size)
+ error("short read %s (%d != %d)", fname, (int) cc,
+ (int)buf.st_size);
+
+ close(fd);
+ /* replace "# comment" with spaces */
+ for (i = 0; i < cc; i++) {
+ if (cp[i] == '#')
+ while (i < cc && cp[i] != '\n')
+ cp[i++] = ' ';
+ }
+ cp[cc] = '\0';
+ return (cp);
+}
+
+#ifdef HAVE_PCAP_FINDALLDEVS
+static long
+parse_interface_number(const char *device)
+{
+ long devnum;
+ char *end;
+
+ devnum = strtol(device, &end, 10);
+ if (device != end && *end == '\0') {
+ /*
+ * It's all-numeric, but is it a valid number?
+ */
+ if (devnum <= 0) {
+ /*
+ * No, it's not an ordinal.
+ */
+ error("Invalid adapter index");
+ }
+ return (devnum);
+ } else {
+ /*
+ * It's not all-numeric; return -1, so our caller
+ * knows that.
+ */
+ return (-1);
+ }
+}
+
+static char *
+find_interface_by_number(long devnum)
+{
+ pcap_if_t *dev, *devlist;
+ long i;
+ char ebuf[PCAP_ERRBUF_SIZE];
+ char *device;
+
+ if (pcap_findalldevs(&devlist, ebuf) < 0)
+ error("%s", ebuf);
+ /*
+ * Look for the devnum-th entry in the list of devices (1-based).
+ */
+ for (i = 0, dev = devlist; i < devnum-1 && dev != NULL;
+ i++, dev = dev->next)
+ ;
+ if (dev == NULL)
+ error("Invalid adapter index");
+ device = strdup(dev->name);
+ pcap_freealldevs(devlist);
+ return (device);
+}
+#endif
+
+static pcap_t *
+open_interface(const char *device, netdissect_options *ndo, char *ebuf)
+{
+ pcap_t *pc;
+#ifdef HAVE_PCAP_CREATE
+ int status;
+ char *cp;
+#endif
+
+#ifdef HAVE_PCAP_CREATE
+ pc = pcap_create(device, ebuf);
+ if (pc == NULL) {
+ /*
+ * If this failed with "No such device", that means
+ * the interface doesn't exist; return NULL, so that
+ * the caller can see whether the device name is
+ * actually an interface index.
+ */
+ if (strstr(ebuf, "No such device") != NULL)
+ return (NULL);
+ error("%s", ebuf);
+ }
+#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
+ if (Jflag)
+ show_tstamp_types_and_exit(pc, device);
+#endif
+#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
+ status = pcap_set_tstamp_precision(pc, ndo->ndo_tstamp_precision);
+ if (status != 0)
+ error("%s: Can't set %ssecond time stamp precision: %s",
+ device,
+ tstamp_precision_to_string(ndo->ndo_tstamp_precision),
+ pcap_statustostr(status));
+#endif
+
+#ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
+ if (immediate_mode) {
+ status = pcap_set_immediate_mode(pc, 1);
+ if (status != 0)
+ error("%s: Can't set immediate mode: %s",
+ device,
+ pcap_statustostr(status));
+ }
+#endif
+ /*
+ * Is this an interface that supports monitor mode?
+ */
+ if (pcap_can_set_rfmon(pc) == 1)
+ supports_monitor_mode = 1;
+ else
+ supports_monitor_mode = 0;
+ status = pcap_set_snaplen(pc, ndo->ndo_snaplen);
+ if (status != 0)
+ error("%s: Can't set snapshot length: %s",
+ device, pcap_statustostr(status));
+ status = pcap_set_promisc(pc, !pflag);
+ if (status != 0)
+ error("%s: Can't set promiscuous mode: %s",
+ device, pcap_statustostr(status));
+ if (Iflag) {
+ status = pcap_set_rfmon(pc, 1);
+ if (status != 0)
+ error("%s: Can't set monitor mode: %s",
+ device, pcap_statustostr(status));
+ }
+ status = pcap_set_timeout(pc, 1000);
+ if (status != 0)
+ error("%s: pcap_set_timeout failed: %s",
+ device, pcap_statustostr(status));
+ if (Bflag != 0) {
+ status = pcap_set_buffer_size(pc, Bflag);
+ if (status != 0)
+ error("%s: Can't set buffer size: %s",
+ device, pcap_statustostr(status));
+ }
+#ifdef HAVE_PCAP_SET_TSTAMP_TYPE
+ if (jflag != -1) {
+ status = pcap_set_tstamp_type(pc, jflag);
+ if (status < 0)
+ error("%s: Can't set time stamp type: %s",
+ device, pcap_statustostr(status));
+ else if (status > 0)
+ warning("When trying to set timestamp type '%s' on %s: %s",
+ pcap_tstamp_type_val_to_name(jflag), device,
+ pcap_statustostr(status));
+ }
+#endif
+ status = pcap_activate(pc);
+ if (status < 0) {
+ /*
+ * pcap_activate() failed.
+ */
+ cp = pcap_geterr(pc);
+ if (status == PCAP_ERROR)
+ error("%s", cp);
+ else if (status == PCAP_ERROR_NO_SUCH_DEVICE) {
+ /*
+ * Return an error for our caller to handle.
+ */
+ snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s\n(%s)",
+ device, pcap_statustostr(status), cp);
+ pcap_close(pc);
+ return (NULL);
+ } else if (status == PCAP_ERROR_PERM_DENIED && *cp != '\0')
+ error("%s: %s\n(%s)", device,
+ pcap_statustostr(status), cp);
+ else
+ error("%s: %s", device,
+ pcap_statustostr(status));
+ } else if (status > 0) {
+ /*
+ * pcap_activate() succeeded, but it's warning us
+ * of a problem it had.
+ */
+ cp = pcap_geterr(pc);
+ if (status == PCAP_WARNING)
+ warning("%s", cp);
+ else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
+ *cp != '\0')
+ warning("%s: %s\n(%s)", device,
+ pcap_statustostr(status), cp);
+ else
+ warning("%s: %s", device,
+ pcap_statustostr(status));
+ }
+#ifdef HAVE_PCAP_SETDIRECTION
+ if (Qflag != -1) {
+ status = pcap_setdirection(pc, Qflag);
+ if (status != 0)
+ error("%s: pcap_setdirection() failed: %s",
+ device, pcap_geterr(pc));
+ }
+#endif /* HAVE_PCAP_SETDIRECTION */
+#else /* HAVE_PCAP_CREATE */
+ *ebuf = '\0';
+ pc = pcap_open_live(device, ndo->ndo_snaplen, !pflag, 1000, ebuf);
+ if (pc == NULL) {
+ /*
+ * If this failed with "No such device", that means
+ * the interface doesn't exist; return NULL, so that
+ * the caller can see whether the device name is
+ * actually an interface index.
+ */
+ if (strstr(ebuf, "No such device") != NULL)
+ return (NULL);
+ error("%s", ebuf);
+ }
+ if (*ebuf)
+ warning("%s", ebuf);
+#endif /* HAVE_PCAP_CREATE */
+
+ return (pc);
+}
+
projects / tcpdump / blobdiff