/** Add a VP to the end of the list.
*
* Locates the end of 'first', and links an additional VP 'add' at the end.
*
* @param[in] first VP in linked list. Will add new VP to the end of this list.
* @param[in] add VP to add to list.
*/
void pairadd(VALUE_PAIR **first, VALUE_PAIR *add)
{
VALUE_PAIR *i;
if (!add) return;
VERIFY_VP(add);
if (*first == NULL) {
*first = add;
return;
}
for (i = *first; i->next; i = i->next) {
#ifdef WITH_VERIFY_PTR
VERIFY_VP(i);
/*
* The same VP should never by added multiple times
* to the same list.
*/
fr_assert(i != add);
#endif
}
i->next = add;
}
/** Generate a backtrace for an object
*
* If this is the first entry being inserted
*/
int fr_backtrace_do(fr_bt_marker_t *marker)
{
fr_bt_info_t *bt;
if (!fr_assert(marker->obj) || !fr_assert(marker->cbuff)) return -1;
bt = talloc_zero(NULL, fr_bt_info_t);
if (!bt) return -1;
bt->obj = marker->obj;
bt->count = backtrace(bt->frames, MAX_BT_FRAMES);
fr_cbuff_rp_insert(marker->cbuff, bt);
return 0;
}
/** Remove the current pair
*
* @todo this is really inefficient and should be fixed...
*
* @addtogroup module_safe
*
* @param cursor to remove the current pair from.
* @return
* - #VALUE_PAIR we just replaced.
* - NULL on error.
*/
VALUE_PAIR *fr_cursor_remove(vp_cursor_t *cursor)
{
VALUE_PAIR *vp, **last;
if (!fr_assert(cursor->first)) return NULL; /* cursor must have been initialised */
vp = cursor->current;
if (!vp) return NULL;
last = cursor->first;
while (*last != vp) last = &(*last)->next;
fr_cursor_next(cursor); /* Advance the cursor past the one were about to delete */
*last = vp->next;
vp->next = NULL;
/*
* Fixup cursor->found if we removed the VP it was referring to
*/
if (vp == cursor->found) cursor->found = *last;
/*
* Fixup cursor->last if we removed the VP it was referring to
*/
if (vp == cursor->last) cursor->last = *last;
return vp;
}
/** Generate a backtrace for an object during destruction
*
* If this is the first entry being inserted
*/
static int _fr_do_bt(fr_bt_marker_t *marker)
{
fr_bt_info_t *bt;
if (!fr_assert(marker->obj) || !fr_assert(marker->cbuff)) {
return -1;
}
bt = talloc_zero(marker->cbuff, fr_bt_info_t);
if (!bt) {
return -1;
}
bt->count = backtrace(bt->frames, MAX_BT_FRAMES);
fr_cbuff_rp_insert(marker->cbuff, bt);
return 0;
}
/** Find the pair with the matching DAs
*
*/
VALUE_PAIR *pair_find_by_da(VALUE_PAIR *vp, DICT_ATTR const *da, int8_t tag)
{
vp_cursor_t cursor;
if(!fr_assert(da)) {
return NULL;
}
(void) fr_cursor_init(&cursor, &vp);
return fr_cursor_next_by_da(&cursor, da, tag);
}
/** Merges multiple VALUE_PAIR into the cursor
*
* Add multiple VALUE_PAIR from add to cursor.
*
* @addtogroup module_safe
*
* @param cursor to insert VALUE_PAIRs with
* @param add one or more VALUE_PAIRs (may be NULL, which results in noop).
*/
void fr_cursor_merge(vp_cursor_t *cursor, VALUE_PAIR *add)
{
vp_cursor_t from;
VALUE_PAIR *vp;
if (!add) return;
if (!fr_assert(cursor->first)) return; /* cursor must have been initialised */
for (vp = fr_cursor_init(&from, &add);
vp;
vp = fr_cursor_next(&from)) {
fr_cursor_insert(cursor, vp);
}
}
/** Escape string that may contain binary data, and write it to a new buffer
*
* This is useful in situations where we expect printable strings as input,
* but under some conditions may get binary data. A good example is libldap
* and the arrays of struct berval ldap_get_values_len returns.
*
* @param[in] ctx To allocate new buffer in.
* @param[in] in String to escape.
* @param[in] inlen Length of string. Should be >= 0 if the data may contain
* embedded \0s. Must be >= 0 if data may not be \0 terminated.
* If < 0 inlen will be calculated using strlen.
* @param[in] quote the quotation character.
* @return new buffer holding the escaped string.
*/
char *fr_aprints(TALLOC_CTX *ctx, char const *in, ssize_t inlen, char quote)
{
size_t len, ret;
char *out;
len = fr_prints_len(in, inlen, quote);
out = talloc_array(ctx, char, len);
ret = fr_prints(out, len, in, inlen, quote);
/*
* This is a fatal error, but fr_assert is the strongest
* assert we're allowed to use in library functions.
*/
if (!fr_assert(ret == (len - 1))) {
talloc_free(out);
return NULL;
}
return out;
}
/** Write an error to the library errorbuff detailing the mismatch
*
* Retrieve output with fr_strerror();
*
* @todo add thread specific talloc contexts.
*
* @param ctx a hack until we have thread specific talloc contexts.
* @param failed pair of attributes which didn't match.
*/
void pairvalidate_debug(TALLOC_CTX *ctx, VALUE_PAIR const *failed[2])
{
VALUE_PAIR const *filter = failed[0];
VALUE_PAIR const *list = failed[1];
char *value, *str;
(void) fr_strerror(); /* Clear any existing messages */
if (!fr_assert(!(!filter && !list))) return;
if (!list) {
if (!filter) return;
fr_strerror_printf("Attribute \"%s\" not found in list", filter->da->name);
return;
}
if (!filter || (filter->da != list->da)) {
fr_strerror_printf("Attribute \"%s\" not found in filter", list->da->name);
return;
}
if (!TAG_EQ(filter->tag, list->tag)) {
fr_strerror_printf("Attribute \"%s\" tag \"%i\" didn't match filter tag \"%i\"",
list->da->name, list->tag, filter->tag);
return;
}
value = vp_aprints_value(ctx, list, '"');
str = vp_aprints(ctx, filter, '"');
fr_strerror_printf("Attribute value \"%s\" didn't match filter: %s", value, str);
talloc_free(str);
talloc_free(value);
return;
}
int main(int argc, char *argv[])
{
rs_t *conf;
fr_pcap_t *in = NULL, *in_p;
fr_pcap_t **in_head = ∈
fr_pcap_t *out = NULL;
int ret = 1; /* Exit status */
int limit = -1; /* How many packets to sniff */
char errbuf[PCAP_ERRBUF_SIZE]; /* Error buffer */
int port = 1812;
char buffer[1024];
int opt;
FR_TOKEN parsecode;
char const *radius_dir = RADIUS_DIR;
rs_stats_t stats;
fr_debug_flag = 2;
log_dst = stdout;
talloc_set_log_stderr();
conf = talloc_zero(NULL, rs_t);
if (!fr_assert(conf)) {
exit (1);
}
/*
* We don't really want probes taking down machines
*/
#ifdef HAVE_TALLOC_SET_MEMLIMIT
talloc_set_memlimit(conf, 52428800); /* 50 MB */
#endif
/*
* Get options
*/
while ((opt = getopt(argc, argv, "c:d:DFf:hi:I:p:qr:s:Svw:xXW:P:O:")) != EOF) {
switch (opt) {
case 'c':
limit = atoi(optarg);
if (limit <= 0) {
fprintf(stderr, "radsniff: Invalid number of packets \"%s\"", optarg);
exit(1);
}
break;
case 'd':
radius_dir = optarg;
break;
case 'D':
{
pcap_if_t *all_devices = NULL;
pcap_if_t *dev_p;
if (pcap_findalldevs(&all_devices, errbuf) < 0) {
ERROR("Error getting available capture devices: %s", errbuf);
goto finish;
}
int i = 1;
for (dev_p = all_devices;
dev_p;
dev_p = dev_p->next) {
INFO("%i.%s", i++, dev_p->name);
}
ret = 0;
goto finish;
}
case 'F':
conf->from_stdin = true;
conf->to_stdout = true;
break;
case 'f':
conf->pcap_filter = optarg;
break;
case 'h':
usage(0);
break;
case 'i':
*in_head = fr_pcap_init(conf, optarg, PCAP_INTERFACE_IN);
if (!*in_head) {
goto finish;
}
in_head = &(*in_head)->next;
conf->from_dev = true;
break;
case 'I':
*in_head = fr_pcap_init(conf, optarg, PCAP_FILE_IN);
if (!*in_head) {
goto finish;
}
in_head = &(*in_head)->next;
conf->from_file = true;
break;
case 'p':
port = atoi(optarg);
break;
case 'q':
if (fr_debug_flag > 0) {
fr_debug_flag--;
}
break;
case 'r':
conf->radius_filter = optarg;
break;
case 's':
conf->radius_secret = optarg;
break;
case 'S':
conf->do_sort = true;
break;
case 'v':
#ifdef HAVE_COLLECTDC_H
INFO("%s, %s, collectdclient version %s", radsniff_version, pcap_lib_version(),
lcc_version_string());
#else
INFO("%s %s", radsniff_version, pcap_lib_version());
#endif
exit(0);
break;
case 'w':
out = fr_pcap_init(conf, optarg, PCAP_FILE_OUT);
conf->to_file = true;
break;
case 'x':
case 'X':
fr_debug_flag++;
break;
case 'W':
conf->stats.interval = atoi(optarg);
if (conf->stats.interval <= 0) {
ERROR("Stats interval must be > 0");
usage(64);
}
break;
case 'T':
conf->stats.timeout = atoi(optarg);
if (conf->stats.timeout <= 0) {
ERROR("Timeout value must be > 0");
usage(64);
}
break;
#ifdef HAVE_COLLECTDC_H
case 'P':
conf->stats.prefix = optarg;
break;
case 'O':
conf->stats.collectd = optarg;
conf->stats.out = RS_STATS_OUT_COLLECTD;
break;
#endif
default:
usage(64);
}
}
/* What's the point in specifying -F ?! */
if (conf->from_stdin && conf->from_file && conf->to_file) {
usage(64);
}
/* Can't read from both... */
if (conf->from_file && conf->from_dev) {
usage(64);
}
/* Reading from file overrides stdin */
if (conf->from_stdin && (conf->from_file || conf->from_dev)) {
conf->from_stdin = false;
}
/* Writing to file overrides stdout */
if (conf->to_file && conf->to_stdout) {
conf->to_stdout = false;
}
if (conf->to_stdout) {
out = fr_pcap_init(conf, "stdout", PCAP_STDIO_OUT);
if (!out) {
goto finish;
}
}
if (conf->from_stdin) {
*in_head = fr_pcap_init(conf, "stdin", PCAP_STDIO_IN);
if (!*in_head) {
goto finish;
}
in_head = &(*in_head)->next;
}
if (!conf->radius_secret) {
conf->radius_secret = RS_DEFAULT_SECRET;
}
if (conf->stats.interval && !conf->stats.out) {
conf->stats.out = RS_STATS_OUT_STDIO;
}
if (conf->stats.timeout == 0) {
conf->stats.timeout = RS_DEFAULT_TIMEOUT;
}
/*
* If were writing pcap data stdout we *really* don't want to send
* logging there as well.
*/
log_dst = conf->to_stdout ? stderr : stdout;
#if !defined(HAVE_PCAP_FOPEN_OFFLINE) || !defined(HAVE_PCAP_DUMP_FOPEN)
if (conf->from_stdin || conf->to_stdout) {
ERROR("PCAP streams not supported");
goto finish;
}
#endif
if (!conf->pcap_filter) {
snprintf(buffer, sizeof(buffer), "udp port %d or %d or %d",
port, port + 1, 3799);
conf->pcap_filter = buffer;
}
if (dict_init(radius_dir, RADIUS_DICTIONARY) < 0) {
fr_perror("radsniff");
ret = 64;
goto finish;
}
fr_strerror(); /* Clear out any non-fatal errors */
if (conf->radius_filter) {
parsecode = userparse(NULL, conf->radius_filter, &filter_vps);
if (parsecode == T_OP_INVALID) {
ERROR("Invalid RADIUS filter \"%s\" (%s)", conf->radius_filter, fr_strerror());
ret = 64;
goto finish;
}
if (!filter_vps) {
ERROR("Empty RADIUS filter \"%s\"", conf->radius_filter);
ret = 64;
goto finish;
}
filter_tree = rbtree_create((rbcmp) fr_packet_cmp, _rb_rad_free, 0);
if (!filter_tree) {
ERROR("Failed creating filter tree");
ret = 64;
goto finish;
}
}
/*
* Setup the request tree
*/
request_tree = rbtree_create((rbcmp) fr_packet_cmp, _rb_rad_free, 0);
if (!request_tree) {
ERROR("Failed creating request tree");
goto finish;
}
/*
* Allocate a null packet for decrypting attributes in CoA requests
*/
nullpacket = rad_alloc(conf, 0);
if (!nullpacket) {
ERROR("Out of memory");
goto finish;
}
/*
* Get the default capture device
*/
if (!conf->from_stdin && !conf->from_file && !conf->from_dev) {
pcap_if_t *all_devices; /* List of all devices libpcap can listen on */
pcap_if_t *dev_p;
if (pcap_findalldevs(&all_devices, errbuf) < 0) {
ERROR("Error getting available capture devices: %s", errbuf);
goto finish;
}
if (!all_devices) {
ERROR("No capture files specified and no live interfaces available");
ret = 64;
goto finish;
}
for (dev_p = all_devices;
dev_p;
dev_p = dev_p->next) {
/* Don't use the any devices, it's horribly broken */
if (!strcmp(dev_p->name, "any")) continue;
*in_head = fr_pcap_init(conf, dev_p->name, PCAP_INTERFACE_IN);
in_head = &(*in_head)->next;
}
conf->from_auto = true;
conf->from_dev = true;
INFO("Defaulting to capture on all interfaces");
}
/*
* Print captures values which will be used
*/
if (fr_debug_flag > 2) {
DEBUG1("Sniffing with options:");
if (conf->from_dev) {
char *buff = fr_pcap_device_names(conf, in, ' ');
DEBUG1(" Device(s) : [%s]", buff);
talloc_free(buff);
}
if (conf->to_file || conf->to_stdout) {
DEBUG1(" Writing to : [%s]", out->name);
}
if (limit > 0) {
DEBUG1(" Capture limit (packets) : [%d]", limit);
}
DEBUG1(" PCAP filter : [%s]", conf->pcap_filter);
DEBUG1(" RADIUS secret : [%s]", conf->radius_secret);
if (filter_vps){
DEBUG1(" RADIUS filter :");
vp_printlist(log_dst, filter_vps);
}
}
/*
* Open our interface to collectd
*/
#ifdef HAVE_COLLECTDC_H
if (conf->stats.out == RS_STATS_OUT_COLLECTD) {
size_t i;
rs_stats_tmpl_t *tmpl, **next;
if (rs_stats_collectd_open(conf) < 0) {
exit(1);
}
next = &conf->stats.tmpl;
for (i = 0; i < (sizeof(rs_useful_codes) / sizeof(*rs_useful_codes)); i++) {
tmpl = rs_stats_collectd_init_latency(conf, next, conf, "radius_pkt_ex",
&stats.exchange[rs_useful_codes[i]],
rs_useful_codes[i]);
if (!tmpl) {
goto tmpl_error;
}
next = &(tmpl->next);
tmpl = rs_stats_collectd_init_counter(conf, next, conf, "radius_pkt",
&stats.gauge.type[rs_useful_codes[i]],
rs_useful_codes[i]);
if (!tmpl) {
tmpl_error:
ERROR("Error allocating memory for stats template");
goto finish;
}
next = &(tmpl->next);
}
}
#endif
/*
* This actually opens the capture interfaces/files (we just allocated the memory earlier)
*/
{
fr_pcap_t *prev = NULL;
for (in_p = in;
in_p;
in_p = in_p->next) {
if (fr_pcap_open(in_p) < 0) {
if (!conf->from_auto) {
ERROR("Failed opening pcap handle for %s", in_p->name);
goto finish;
}
DEBUG("Failed opening pcap handle: %s", fr_strerror());
/* Unlink it from the list */
if (prev) {
prev->next = in_p->next;
talloc_free(in_p);
in_p = prev;
} else {
in = in_p->next;
talloc_free(in_p);
in_p = in;
}
goto next;
}
if (conf->pcap_filter) {
if (fr_pcap_apply_filter(in_p, conf->pcap_filter) < 0) {
ERROR("Failed applying filter");
goto finish;
}
}
next:
prev = in_p;
}
}
/*
* Open our output interface (if we have one);
*/
if (out) {
if (fr_pcap_open(out) < 0) {
ERROR("Failed opening pcap output");
goto finish;
}
}
/*
* Setup and enter the main event loop. Who needs libev when you can roll your own...
*/
{
struct timeval now;
fr_event_list_t *events;
rs_update_t update;
char *buff;
memset(&stats, 0, sizeof(stats));
memset(&update, 0, sizeof(update));
events = fr_event_list_create(conf, _rs_event_status);
if (!events) {
ERROR();
goto finish;
}
for (in_p = in;
in_p;
in_p = in_p->next) {
rs_event_t *event;
event = talloc_zero(events, rs_event_t);
event->conf = conf;
event->in = in_p;
event->out = out;
event->stats = &stats;
if (!fr_event_fd_insert(events, 0, in_p->fd, rs_got_packet, event)) {
ERROR("Failed inserting file descriptor");
goto finish;
}
}
buff = fr_pcap_device_names(conf, in, ' ');
INFO("Sniffing on (%s)", buff);
talloc_free(buff);
gettimeofday(&now, NULL);
start_pcap = now;
/*
* Insert our stats processor
*/
if (conf->stats.interval) {
update.list = events;
update.conf = conf;
update.stats = &stats;
update.in = in;
now.tv_sec += conf->stats.interval;
now.tv_usec = 0;
fr_event_insert(events, rs_stats_process, (void *) &update, &now, NULL);
}
ret = fr_event_loop(events); /* Enter the main event loop */
}
INFO("Done sniffing");
finish:
if (filter_tree) {
rbtree_free(filter_tree);
}
INFO("Exiting...");
/*
* Free all the things! This also closes all the sockets and file descriptors
*/
talloc_free(conf);
return ret;
}
/** Open a PCAP handle abstraction
*
* This opens interfaces for capture or injection, or files/streams for reading/writing.
* @param pcap created with fr_pcap_init.
* @return 0 on success, -1 on error.
*/
int fr_pcap_open(fr_pcap_t *pcap)
{
switch (pcap->type) {
case PCAP_INTERFACE_OUT:
case PCAP_INTERFACE_IN:
{
#if defined(HAVE_PCAP_CREATE) && defined(HAVE_PCAP_ACTIVATE)
pcap->handle = pcap_create(pcap->name, pcap->errbuf);
if (!pcap->handle) {
fr_strerror_printf("%s", pcap->errbuf);
return -1;
}
if (pcap_set_snaplen(pcap->handle, SNAPLEN) != 0) {
create_error:
fr_strerror_printf("%s", pcap_geterr(pcap->handle));
pcap_close(pcap->handle);
pcap->handle = NULL;
return -1;
}
if (pcap_set_timeout(pcap->handle, PCAP_NONBLOCK_TIMEOUT) != 0) {
goto create_error;
}
if (pcap_set_promisc(pcap->handle, pcap->promiscuous) != 0) {
goto create_error;
}
if (pcap_set_buffer_size(pcap->handle, SNAPLEN *
(pcap->buffer_pkts ? pcap->buffer_pkts : PCAP_BUFFER_DEFAULT)) != 0) {
goto create_error;
}
if (pcap_activate(pcap->handle) != 0) {
goto create_error;
}
#else
/*
* Alternative functions for libpcap < 1.0
*/
pcap->handle = pcap_open_live(pcap->name, SNAPLEN, pcap->promiscuous, PCAP_NONBLOCK_TIMEOUT,
pcap->errbuf);
if (!pcap->handle) {
fr_strerror_printf("%s", pcap->errbuf);
return -1;
}
#endif
/*
* Despite accepting an errbuff, pcap_setnonblock doesn't seem to write
* error message there in newer versions.
*/
if (pcap_setnonblock(pcap->handle, true, pcap->errbuf) != 0) {
fr_strerror_printf("%s", *pcap->errbuf != '\0' ?
pcap->errbuf : pcap_geterr(pcap->handle));
pcap_close(pcap->handle);
pcap->handle = NULL;
return -1;
}
pcap->fd = pcap_get_selectable_fd(pcap->handle);
pcap->link_layer = pcap_datalink(pcap->handle);
#ifndef __linux__
{
int value = 1;
if (ioctl(pcap->fd, BIOCIMMEDIATE, &value) < 0) {
fr_strerror_printf("Failed setting BIOCIMMEDIATE: %s", fr_syserror(errno));
}
}
#endif
}
break;
case PCAP_FILE_IN:
pcap->handle = pcap_open_offline(pcap->name, pcap->errbuf);
if (!pcap->handle) {
fr_strerror_printf("%s", pcap->errbuf);
return -1;
}
pcap->fd = pcap_get_selectable_fd(pcap->handle);
pcap->link_layer = pcap_datalink(pcap->handle);
break;
case PCAP_FILE_OUT:
if (pcap->link_layer < 0) {
pcap->link_layer = DLT_EN10MB;
}
pcap->handle = pcap_open_dead(pcap->link_layer, SNAPLEN);
if (!pcap->handle) {
fr_strerror_printf("Unknown error occurred opening dead PCAP handle");
return -1;
}
pcap->dumper = pcap_dump_open(pcap->handle, pcap->name);
if (!pcap->dumper) {
fr_strerror_printf("%s", pcap_geterr(pcap->handle));
return -1;
}
break;
#ifdef HAVE_PCAP_FOPEN_OFFLINE
case PCAP_STDIO_IN:
pcap->handle = pcap_fopen_offline(stdin, pcap->errbuf);
if (!pcap->handle) {
fr_strerror_printf("%s", pcap->errbuf);
return -1;
}
pcap->fd = pcap_get_selectable_fd(pcap->handle);
pcap->link_layer = pcap_datalink(pcap->handle);
break;
#else
case PCAP_STDIO_IN:
fr_strerror_printf("This version of libpcap does not support reading pcap data from streams");
return -1;
#endif
#ifdef HAVE_PCAP_DUMP_FOPEN
case PCAP_STDIO_OUT:
pcap->handle = pcap_open_dead(DLT_EN10MB, SNAPLEN);
pcap->dumper = pcap_dump_fopen(pcap->handle, stdout);
if (!pcap->dumper) {
fr_strerror_printf("%s", pcap_geterr(pcap->handle));
return -1;
}
break;
#else
case PCAP_STDIO_OUT:
fr_strerror_printf("This version of libpcap does not support writing pcap data to streams");
return -1;
#endif
case PCAP_INVALID:
default:
fr_assert(0);
fr_strerror_printf("Bad handle type (%i)", pcap->type);
return -1;
}
return 0;
}
/** Insert a single VALUE_PAIR at the end of the list
*
* @note Will not advance cursor position to new attribute, but will set cursor
* to this attribute, if it's the first one in the list.
*
* Insert a VALUE_PAIR at the end of the list.
*
* @addtogroup module_safe
*
* @param cursor to operate on.
* @param vp to insert.
*/
void fr_cursor_insert(vp_cursor_t *cursor, VALUE_PAIR *vp)
{
VALUE_PAIR *i;
if (!fr_assert(cursor->first)) return; /* cursor must have been initialised */
if (!vp) return;
VERIFY_VP(vp);
/*
* Only allow one VP to by inserted at a time
*/
vp->next = NULL;
/*
* Cursor was initialised with a pointer to a NULL value_pair
*/
if (!*cursor->first) {
*cursor->first = vp;
cursor->current = vp;
return;
}
/*
* We don't yet know where the last VALUE_PAIR is
*
* Assume current is closer to the end of the list and
* use that if available.
*/
if (!cursor->last) cursor->last = cursor->current ? cursor->current : *cursor->first;
VERIFY_VP(cursor->last);
/*
* Wind last to the end of the list.
*/
if (cursor->last->next) {
for (i = cursor->last; i; i = i->next) {
VERIFY_VP(i);
cursor->last = i;
}
}
/*
* Either current was never set, or something iterated to the
* end of the attribute list. In both cases the newly inserted
* VALUE_PAIR should be set as the current VALUE_PAIR.
*/
if (!cursor->current) cursor->current = vp;
/*
* Add the VALUE_PAIR to the end of the list
*/
cursor->last->next = vp;
cursor->last = vp; /* Wind it forward a little more */
/*
* If the next pointer was NULL, and the VALUE_PAIR
* just added has a next pointer value, set the cursor's next
* pointer to the VALUE_PAIR's next pointer.
*/
if (!cursor->next) cursor->next = cursor->current->next;
}
/** Open a PCAP handle abstraction
*
* This opens interfaces for capture or injection, or files/streams for reading/writing.
* @param pcap created with fr_pcap_init.
* @return 0 on success, -1 on error.
*/
int fr_pcap_open(fr_pcap_t *pcap)
{
switch (pcap->type) {
case PCAP_INTERFACE_OUT:
case PCAP_INTERFACE_IN:
pcap->handle = pcap_open_live(pcap->name, SNAPLEN, true, PCAP_NONBLOCK_TIMEOUT,
pcap->errbuf);
if (!pcap->handle) {
fr_strerror_printf("%s", pcap->errbuf);
return -1;
}
pcap->fd = pcap_get_selectable_fd(pcap->handle);
#ifndef __linux__
{
int value = 1;
if (ioctl(pcap->fd, BIOCIMMEDIATE, &value) < 0) {
fr_strerror_printf("Failed setting BIOCIMMEDIATE: %s", fr_syserror(errno));
}
}
#endif
break;
case PCAP_FILE_IN:
pcap->handle = pcap_open_offline(pcap->name, pcap->errbuf);
if (!pcap->handle) {
fr_strerror_printf("%s", pcap->errbuf);
return -1;
}
break;
case PCAP_FILE_OUT:
pcap->handle = pcap_open_dead(DLT_EN10MB, SNAPLEN);
pcap->dumper = pcap_dump_open(pcap->handle, pcap->name);
if (!pcap->dumper) {
fr_strerror_printf("%s", pcap->errbuf);
return -1;
}
break;
#ifdef HAVE_PCAP_FOPEN_OFFLINE
case PCAP_STDIO_IN:
pcap->handle = pcap_fopen_offline(stdin, pcap->errbuf);
if (!pcap->handle) {
fr_strerror_printf("%s", pcap->errbuf);
return -1;
}
break;
#else
case PCAP_STDIO_IN:
fr_strerror_printf("This version of libpcap does not support reading pcap data from streams");
return -1;
#endif
#ifdef HAVE_PCAP_DUMP_FOPEN
case PCAP_STDIO_OUT:
pcap->handle = pcap_open_dead(DLT_EN10MB, SNAPLEN);
pcap->dumper = pcap_dump_fopen(pcap->handle, stdout);
if (!pcap->dumper) {
fr_strerror_printf("%s", pcap_geterr(pcap->handle));
return -1;
}
break;
#else
case PCAP_STDIO_OUT:
fr_strerror_printf("This version of libpcap does not support writing pcap data to streams");
return -1;
#endif
case PCAP_INVALID:
default:
fr_assert(0);
return -1;
}
return 0;
}