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Support filtering filtering E1 SS7 traffic on MTP2 layer Annex A.
[libpcap] / pcap-sita.c
1 /*
2 * pcap-sita.c: Packet capture interface additions for SITA ACN devices
3 *
4 * Copyright (c) 2007 Fulko Hew, SITA INC Canada, Inc <fulko.hew@sita.aero>
5 *
6 * License: BSD
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 * 3. The names of the authors may not be used to endorse or promote
19 * products derived from this software without specific prior
20 * written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
25 */
26
27 /* $Id: pcap-sita.c */
28
29 #ifdef HAVE_CONFIG_H
30 #include "config.h"
31 #endif
32
33 #include <stdio.h>
34 #include <string.h>
35 #include <stdlib.h>
36 #include <unistd.h>
37 #include <fcntl.h>
38 #include <errno.h>
39 #include <sys/time.h>
40 #include <sys/socket.h>
41 #include <netinet/in.h>
42 #include <arpa/inet.h>
43 #include "pcap-int.h"
44
45 #include "pcap-sita.h"
46
47 /* non-configureable manifests follow */
48
49 #define IOP_SNIFFER_PORT 49152 /* TCP port on the IOP used for 'distributed pcap' usage */
50 #define MAX_LINE_SIZE 255 /* max size of a buffer/line in /etc/hosts we allow */
51 #define MAX_CHASSIS 8 /* number of chassis in an ACN site */
52 #define MAX_GEOSLOT 8 /* max number of access units in an ACN site */
53
54 #define FIND 0
55 #define LIVE 1
56
57 typedef struct iface {
58 struct iface *next; /* a pointer to the next interface */
59 char *name; /* this interface's name on Wireshark */
60 char *IOPname; /* this interface's name on an IOP */
61 uint32_t iftype; /* the type of interface (DLT values) */
62 } iface_t;
63
64 typedef struct unit {
65 char *ip; /* this unit's IP address (as extracted from /etc/hosts) */
66 int fd; /* the connection to this unit (if it exists) */
67 int find_fd; /* a big kludge to avoid my programming limitations since I could have this unit open for findalldevs purposes */
68 int first_time; /* 0 = just opened via acn_open_live(), ie. the first time, NZ = nth time */
69 struct sockaddr_in *serv_addr; /* the address control block for comms to this unit */
70 int chassis;
71 int geoslot;
72 iface_t *iface; /* a pointer to a linked list of interface structures */
73 char *imsg; /* a pointer to an inbound message */
74 int len; /* the current size of the inbound message */
75 } unit_t;
76
77 static char *errorString;
78 static unit_t units[MAX_CHASSIS+1][MAX_GEOSLOT+1]; /* we use indexes of 1 through 8, but we reserve/waste index 0 */
79 static fd_set readfds; /* a place to store the file descriptors for the connections to the IOPs */
80 static fd_set working_set;
81 static int max_fs;
82 static char static_buf[32];
83
84 pcap_if_t *acn_if_list; /* pcap's list of available interfaces */
85
86 static void dump_interface_list(void) {
87 pcap_if_t *iff;
88 pcap_addr_t *addr;
89 int longest_name_len = 0;
90 char *n, *d, *f;
91 int if_number = 0;
92
93 iff = acn_if_list;
94 while (iff) {
95 if (iff->name && (strlen(iff->name) > longest_name_len)) longest_name_len = strlen(iff->name);
96 iff = iff->next;
97 }
98 iff = acn_if_list;
99 printf("Interface List:\n");
100 while (iff) {
101 n = (iff->name) ? iff->name : "";
102 d = (iff->description) ? iff->description : "";
103 f = (iff->flags == PCAP_IF_LOOPBACK) ? "L" : "";
104 printf("%3d: %*s %s '%s'\n", if_number++, longest_name_len, n, f, d);
105 addr = iff->addresses;
106 while (addr) {
107 printf("%*s ", (5 + longest_name_len), ""); /* add some indentation */
108 printf("%15s ", (addr->addr) ? inet_ntoa(((struct sockaddr_in *)addr->addr)->sin_addr) : "");
109 printf("%15s ", (addr->netmask) ? inet_ntoa(((struct sockaddr_in *)addr->netmask)->sin_addr) : "");
110 printf("%15s ", (addr->broadaddr) ? inet_ntoa(((struct sockaddr_in *)addr->broadaddr)->sin_addr) : "");
111 printf("%15s ", (addr->dstaddr) ? inet_ntoa(((struct sockaddr_in *)addr->dstaddr)->sin_addr) : "");
112 printf("\n");
113 addr = addr->next;
114 }
115 iff = iff->next;
116 }
117 }
118
119 static void dump(unsigned char *ptr, int i, int indent) {
120 fprintf(stderr, "%*s", indent, " ");
121 for (; i > 0; i--) {
122 fprintf(stderr, "%2.2x ", *ptr++);
123 }
124 fprintf(stderr, "\n");
125 }
126
127 static void dump_interface_list_p(void) {
128 pcap_if_t *iff;
129 pcap_addr_t *addr;
130 int if_number = 0;
131
132 iff = acn_if_list;
133 printf("Interface Pointer @ %p is %p:\n", &acn_if_list, iff);
134 while (iff) {
135 printf("%3d: %p %p next: %p\n", if_number++, iff->name, iff->description, iff->next);
136 dump((unsigned char *)iff, sizeof(pcap_if_t), 5);
137 addr = iff->addresses;
138 while (addr) {
139 printf(" %p %p %p %p, next: %p\n", addr->addr, addr->netmask, addr->broadaddr, addr->dstaddr, addr->next);
140 dump((unsigned char *)addr, sizeof(pcap_addr_t), 10);
141 addr = addr->next;
142 }
143 iff = iff->next;
144 }
145 }
146
147 static void dump_unit_table(void) {
148 int chassis, geoslot;
149 iface_t *p;
150
151 printf("%c:%c %s %s\n", 'C', 'S', "fd", "IP Address");
152 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
153 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
154 if (units[chassis][geoslot].ip != NULL)
155 printf("%d:%d %2d %s\n", chassis, geoslot, units[chassis][geoslot].fd, units[chassis][geoslot].ip);
156 p = units[chassis][geoslot].iface;
157 while (p) {
158 char *n = (p->name) ? p->name : "";
159 char *i = (p->IOPname) ? p->IOPname : "";
160 p = p->next;
161 printf(" %12s -> %12s\n", i, n);
162 }
163 }
164 }
165 }
166
167 static int find_unit_by_fd(int fd, int *chassis, int *geoslot, unit_t **unit_ptr) {
168 int c, s;
169
170 for (c = 0; c <= MAX_CHASSIS; c++) {
171 for (s = 0; s <= MAX_GEOSLOT; s++) {
172 if (units[c][s].fd == fd || units[c][s].find_fd == fd) {
173 if (chassis) *chassis = c;
174 if (geoslot) *geoslot = s;
175 if (unit_ptr) *unit_ptr = &units[c][s];
176 return 1;
177 }
178 }
179 }
180 return 0;
181 }
182
183 static int read_client_nbytes(int fd, int count, unsigned char *buf) {
184 unit_t *u;
185 int chassis, geoslot;
186 int len;
187
188 find_unit_by_fd(fd, &chassis, &geoslot, &u);
189 while (count) {
190 if ((len = recv(fd, buf, count, 0)) <= 0) return -1; /* read in whatever data was sent to us */
191 count -= len;
192 buf += len;
193 } /* till we have everything we are looking for */
194 return 0;
195 }
196
197 static void empty_unit_iface(unit_t *u) {
198 iface_t *p, *cur;
199
200 cur = u->iface;
201 while (cur) { /* loop over all the interface entries */
202 if (cur->name) free(cur->name); /* throwing away the contents if they exist */
203 if (cur->IOPname) free(cur->IOPname);
204 p = cur->next;
205 free(cur); /* then throw away the structure itself */
206 cur = p;
207 }
208 u->iface = 0; /* and finally remember that there are no remaining structure */
209 }
210
211 static void empty_unit(int chassis, int geoslot) {
212 unit_t *u = &units[chassis][geoslot];
213
214 empty_unit_iface(u);
215 if (u->imsg) { /* then if an inbound message buffer exists */
216 u->imsg = (char *)realloc(u->imsg, 1); /* and re-allocate the old large buffer into a new small one */
217 if (u->imsg == NULL) { /* oops, realloc call failed */
218 fprintf(stderr, "Warning...call to realloc() failed, value of errno is %d\n", errno);
219
220 }
221 }
222
223 static void empty_unit_table(void) {
224 int chassis, geoslot;
225
226 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
227 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
228 if (units[chassis][geoslot].ip != NULL) {
229 free(units[chassis][geoslot].ip); /* get rid of the malloc'ed space that holds the IP address */
230 units[chassis][geoslot].ip = 0; /* then set the pointer to NULL */
231 }
232 empty_unit(chassis, geoslot);
233 }
234 }
235 }
236
237 static char *find_nth_interface_name(int n) {
238 int chassis, geoslot;
239 iface_t *p;
240 char *last_name = 0;
241
242 if (n < 0) n = 0; /* ensure we are working with a valid number */
243 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */
244 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
245 if (units[chassis][geoslot].ip != NULL) {
246 p = units[chassis][geoslot].iface;
247 while (p) { /* and all interfaces... */
248 if (p->IOPname) last_name = p->name; /* remembering the last name found */
249 if (n-- == 0) return last_name; /* and if we hit the instance requested */
250 p = p->next;
251 }
252 }
253 }
254 }
255 /* if we couldn't fine the selected entry */
256 if (last_name) return last_name; /* ... but we did have at least one entry... return the last entry found */
257 return ""; /* ... but if there wasn't any entry... return an empty string instead */
258 }
259
260 int acn_parse_hosts_file(char *errbuf) { /* returns: -1 = error, 0 = OK */
261 FILE *fp;
262 char buf[MAX_LINE_SIZE];
263 char *ptr, *ptr2;
264 int pos;
265 int chassis, geoslot;
266 unit_t *u;
267
268 empty_unit_table();
269 if ((fp = fopen("/etc/hosts", "r")) == NULL) { /* try to open the hosts file and if it fails */
270 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot open '/etc/hosts' for reading."); /* return the nohostsfile error response */
271 return -1;
272 }
273 while (fgets(buf, MAX_LINE_SIZE-1, fp)) { /* while looping over the file */
274
275 pos = strcspn(buf, "#\n\r"); /* find the first comment character or EOL */
276 *(buf + pos) = '\0'; /* and clobber it and anything that follows it */
277
278 pos = strspn(buf, " \t"); /* then find the first non-white space */
279 if (pos == strlen(buf)) /* if there is nothing but white space on the line */
280 continue; /* ignore that empty line */
281 ptr = buf + pos; /* and skip over any of that leading whitespace */
282
283 if ((ptr2 = strstr(ptr, "_I_")) == NULL) /* skip any lines that don't have names that look like they belong to IOPs */
284 continue;
285 if (*(ptr2 + 4) != '_') /* and skip other lines that have names that don't look like ACN components */
286 continue;
287 *(ptr + strcspn(ptr, " \t")) = '\0'; /* null terminate the IP address so its a standalone string */
288
289 chassis = *(ptr2 + 3) - '0'; /* extract the chassis number */
290 geoslot = *(ptr2 + 5) - '0'; /* and geo-slot number */
291 if (chassis < 1 || chassis > MAX_CHASSIS ||
292 geoslot < 1 || geoslot > MAX_GEOSLOT) { /* if the chassis and/or slot numbers appear to be bad... */
293 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Invalid ACN name in '/etc/hosts'."); /* warn the user */
294 continue; /* and ignore the entry */
295 }
296 if ((ptr2 = (char *)malloc(strlen(ptr) + 1)) == NULL) {
297 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
298 continue;
299 }
300 strcpy(ptr2, ptr); /* copy the IP address into our malloc'ed memory */
301 u = &units[chassis][geoslot];
302 u->ip = ptr2; /* and remember the whole shebang */
303 u->chassis = chassis;
304 u->geoslot = geoslot;
305 }
306 fclose(fp);
307 if (*errbuf) return -1;
308 else return 0;
309 }
310
311 static int open_with_IOP(unit_t *u, int flag) {
312 int sockfd;
313 char *ip;
314
315 if (u->serv_addr == NULL) {
316 u->serv_addr = malloc(sizeof(struct sockaddr_in));
317
318 /* since we called malloc(), lets check to see if we actually got the memory */
319 if (u->serv_addr == NULL) { /* oops, we didn't get the memory requested */
320 fprintf(stderr, "malloc() request for u->serv_addr failed, value of errno is: %d\n", errno);
321 return 0;
322 }
323
324 }
325 ip = u->ip;
326 /* bzero() is deprecated, replaced with memset() */
327 memset((char *)u->serv_addr, 0, sizeof(struct sockaddr_in));
328 u->serv_addr->sin_family = AF_INET;
329 u->serv_addr->sin_addr.s_addr = inet_addr(ip);
330 u->serv_addr->sin_port = htons(IOP_SNIFFER_PORT);
331
332 if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
333 fprintf(stderr, "pcap can't open a socket for connecting to IOP at %s\n", ip);
334 return 0;
335 }
336 if (connect(sockfd, (struct sockaddr *)u->serv_addr, sizeof(struct sockaddr_in)) < 0) {
337 fprintf(stderr, "pcap can't connect to IOP at %s\n", ip);
338 return 0;
339 }
340 if (flag == LIVE) u->fd = sockfd;
341 else u->find_fd = sockfd;
342 u->first_time = 0;
343 return sockfd; /* return the non-zero file descriptor as a 'success' indicator */
344 }
345
346 static void close_with_IOP(int chassis, int geoslot, int flag) {
347 int *id;
348
349 if (flag == LIVE) id = &units[chassis][geoslot].fd;
350 else id = &units[chassis][geoslot].find_fd;
351
352 if (*id) { /* this was the last time, so... if we are connected... */
353 close(*id); /* disconnect us */
354 *id = 0; /* and forget that the descriptor exists because we are not open */
355 }
356 }
357
358 static void pcap_cleanup_acn(pcap_t *handle) {
359 int chassis, geoslot;
360 unit_t *u;
361
362 if (find_unit_by_fd(handle->fd, &chassis, &geoslot, &u) == 0)
363 return;
364 close_with_IOP(chassis, geoslot, LIVE);
365 if (u)
366 u->first_time = 0;
367 pcap_cleanup_live_common(handle);
368 }
369
370 static void send_to_fd(int fd, int len, unsigned char *str) {
371 int nwritten;
372 int chassis, geoslot;
373
374 while (len > 0) {
375 if ((nwritten = write(fd, str, len)) <= 0) {
376 find_unit_by_fd(fd, &chassis, &geoslot, NULL);
377 if (units[chassis][geoslot].fd == fd) close_with_IOP(chassis, geoslot, LIVE);
378 else if (units[chassis][geoslot].find_fd == fd) close_with_IOP(chassis, geoslot, FIND);
379 empty_unit(chassis, geoslot);
380 return;
381 }
382 len -= nwritten;
383 str += nwritten;
384 }
385 }
386
387 static void acn_freealldevs(void) {
388
389 pcap_if_t *iff, *next_iff;
390 pcap_addr_t *addr, *next_addr;
391
392 for (iff = acn_if_list; iff != NULL; iff = next_iff) {
393 next_iff = iff->next;
394 for (addr = iff->addresses; addr != NULL; addr = next_addr) {
395 next_addr = addr->next;
396 if (addr->addr) free(addr->addr);
397 if (addr->netmask) free(addr->netmask);
398 if (addr->broadaddr) free(addr->broadaddr);
399 if (addr->dstaddr) free(addr->dstaddr);
400 free(addr);
401 }
402 if (iff->name) free(iff->name);
403 if (iff->description) free(iff->description);
404 free(iff);
405 }
406 }
407
408 static char *nonUnified_port_num(unit_t *u, int IOPportnum) {
409
410 sprintf(static_buf, "%d_%d", u->chassis, u->geoslot);
411 return static_buf;
412 }
413
414 static char *unified_port_num(unit_t *u, int IOPportnum) {
415 int portnum;
416
417 portnum = ((u->chassis - 1) * 64) + ((u->geoslot - 1) * 8) + IOPportnum + 1;
418 sprintf(static_buf, "%d", portnum);
419 return static_buf;
420 }
421
422 static char *translate_IOP_to_pcap_name(unit_t *u, char *IOPname, bpf_u_int32 iftype) {
423 iface_t *iface_ptr, *iface;
424 char *name;
425 char buf[32];
426 char *proto;
427 char *port;
428 int IOPportnum = 0;
429
430 iface = malloc(sizeof(iface_t)); /* get memory for a structure */
431 if (iface == NULL) { /* oops, we didn't get the memory requested */
432 fprintf(stderr, "Error...couldn't allocate memory for interface structure...value of errno is: %d\n", errno);
433 return NULL;
434 }
435 memset((char *)iface, 0, sizeof(iface_t)); /* bzero is deprecated(), replaced with memset() */
436
437 iface->iftype = iftype; /* remember the interface type of this interface */
438
439 name = malloc(strlen(IOPname) + 1); /* get memory for the IOP's name */
440 if (name == NULL) { /* oops, we didn't get the memory requested */
441 fprintf(stderr, "Error...couldn't allocate memory for IOPname...value of errno is: %d\n", errno);
442 return NULL;
443 }
444
445 strcpy(name, IOPname); /* and copy it in */
446 iface->IOPname = name; /* and stick it into the structure */
447
448 if (strncmp(IOPname, "lo", 2) == 0) {
449 IOPportnum = atoi(&IOPname[2]);
450 switch (iftype) {
451 case DLT_EN10MB: proto = "lo"; port = nonUnified_port_num(u, IOPportnum); break;
452 default: proto = "???"; port = unified_port_num(u, IOPportnum); break;
453 }
454 } else if (strncmp(IOPname, "eth", 3) == 0) {
455 IOPportnum = atoi(&IOPname[3]);
456 switch (iftype) {
457 case DLT_EN10MB: proto = "eth"; port = nonUnified_port_num(u, IOPportnum); break;
458 default: proto = "???"; port = unified_port_num(u, IOPportnum); break;
459 }
460 } else if (strncmp(IOPname, "wan", 3) == 0) {
461 IOPportnum = atoi(&IOPname[3]);
462 switch (iftype) {
463 case DLT_SITA: proto = "wan"; port = unified_port_num(u, IOPportnum); break;
464 default: proto = "???"; port = unified_port_num(u, IOPportnum); break;
465 }
466 }
467
468 sprintf(buf, "%s_%s", proto, port); /* compose the user's name for that IOP port name */
469 name = malloc(strlen(buf) + 1); /* get memory for that name */
470 if (name == NULL) { /* oops, we didn't get the memory requested */
471 fprintf(stderr, "Error...couldn't allocate memory for IOP port name...value of errno is: %d\n", errno);
472 return NULL;
473 }
474
475 strcpy(name, buf); /* and copy it in */
476 iface->name = name; /* and stick it into the structure */
477
478 if (u->iface == 0) { /* if this is the first name */
479 u->iface = iface; /* stick this entry at the head of the list */
480 } else {
481 iface_ptr = u->iface;
482 while (iface_ptr->next) { /* othewise scan the list */
483 iface_ptr = iface_ptr->next; /* till we're at the last entry */
484 }
485 iface_ptr->next = iface; /* then tack this entry on the end of the list */
486 }
487 return iface->name;
488 }
489
490 static int if_sort(char *s1, char *s2) {
491 char *s1_p2, *s2_p2;
492 char str1[MAX_LINE_SIZE], str2[MAX_LINE_SIZE];
493 int s1_p1_len, s2_p1_len;
494 int retval;
495
496 if ((s1_p2 = strchr(s1, '_'))) { /* if an underscore is found... */
497 s1_p1_len = s1_p2 - s1; /* the prefix length is the difference in pointers */
498 s1_p2++; /* the suffix actually starts _after_ the underscore */
499 } else { /* otherwise... */
500 s1_p1_len = strlen(s1); /* the prefix length is the length of the string itself */
501 s1_p2 = 0; /* and there is no suffix */
502 }
503 if ((s2_p2 = strchr(s2, '_'))) { /* now do the same for the second string */
504 s2_p1_len = s2_p2 - s2;
505 s2_p2++;
506 } else {
507 s2_p1_len = strlen(s2);
508 s2_p2 = 0;
509 }
510 strncpy(str1, s1, (s1_p1_len > sizeof(str1)) ? s1_p1_len : sizeof(str1)); *(str1 + s1_p1_len) = 0;
511 strncpy(str2, s2, (s2_p1_len > sizeof(str2)) ? s2_p1_len : sizeof(str2)); *(str2 + s2_p1_len) = 0;
512 retval = strcmp(str1, str2);
513 if (retval != 0) return retval; /* if they are not identical, then we can quit now and return the indication */
514 return strcmp(s1_p2, s2_p2); /* otherwise we return the result of comparing the 2nd half of the string */
515 }
516
517 static void sort_if_table(void) {
518 pcap_if_t *p1, *p2, *prev, *temp;
519 int has_swapped;
520
521 if (!acn_if_list) return; /* nothing to do if the list is empty */
522
523 while (1) {
524 p1 = acn_if_list; /* start at the head of the list */
525 prev = 0;
526 has_swapped = 0;
527 while ((p2 = p1->next)) {
528 if (if_sort(p1->name, p2->name) > 0) {
529 if (prev) { /* we are swapping things that are _not_ at the head of the list */
530 temp = p2->next;
531 prev->next = p2;
532 p2->next = p1;
533 p1->next = temp;
534 } else { /* special treatment if we are swapping with the head of the list */
535 temp = p2->next;
536 acn_if_list= p2;
537 p2->next = p1;
538 p1->next = temp;
539 }
540 p1 = p2;
541 prev = p1;
542 has_swapped = 1;
543 }
544 prev = p1;
545 p1 = p1->next;
546 }
547 if (has_swapped == 0)
548 return;
549 }
550 return;
551 }
552
553 static int process_client_data (char *errbuf) { /* returns: -1 = error, 0 = OK */
554 int chassis, geoslot;
555 unit_t *u;
556 pcap_if_t *iff, *prev_iff;
557 pcap_addr_t *addr, *prev_addr;
558 char *ptr;
559 int address_count;
560 struct sockaddr_in *s;
561 char *newname;
562 bpf_u_int32 interfaceType;
563 unsigned char flags;
564
565 prev_iff = 0;
566 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
567 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { /* now loop over all the devices */
568 u = &units[chassis][geoslot];
569 empty_unit_iface(u);
570 ptr = u->imsg; /* point to the start of the msg for this IOP */
571 while (ptr < (u->imsg + u->len)) {
572 if ((iff = malloc(sizeof(pcap_if_t))) == NULL) {
573 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
574 return -1;
575 }
576 memset((char *)iff, 0, sizeof(pcap_if_t)); /* bzero() is deprecated, replaced with memset() */
577 if (acn_if_list == 0) acn_if_list = iff; /* remember the head of the list */
578 if (prev_iff) prev_iff->next = iff; /* insert a forward link */
579
580 if (*ptr) { /* if there is a count for the name */
581 if ((iff->name = malloc(*ptr + 1)) == NULL) { /* get that amount of space */
582 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
583 return -1;
584 }
585 memcpy(iff->name, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */
586 *(iff->name + *ptr) = 0; /* and null terminate the string */
587 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */
588 }
589 ptr++;
590
591 if (*ptr) { /* if there is a count for the description */
592 if ((iff->description = malloc(*ptr + 1)) == NULL) { /* get that amount of space */
593 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
594 return -1;
595 }
596 memcpy(iff->description, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */
597 *(iff->description + *ptr) = 0; /* and null terminate the string */
598 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */
599 }
600 ptr++;
601
602 interfaceType = ntohl(*(bpf_u_int32 *)ptr);
603 ptr += 4; /* skip over the interface type */
604
605 flags = *ptr++;
606 if (flags) iff->flags = PCAP_IF_LOOPBACK; /* if this is a loopback style interface, lets mark it as such */
607
608 address_count = *ptr++;
609
610 prev_addr = 0;
611 while (address_count--) {
612 if ((addr = malloc(sizeof(pcap_addr_t))) == NULL) {
613 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
614 return -1;
615 }
616 + memset((char *)addr, 0, sizeof(pcap_addr_t)); /* bzero() is deprecated, replaced with memset() */
617 if (iff->addresses == 0) iff->addresses = addr;
618 if (prev_addr) prev_addr->next = addr; /* insert a forward link */
619 if (*ptr) { /* if there is a count for the address */
620 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { /* get that amount of space */
621 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
622 return -1;
623 }
624 memset((char *)s, 0, sizeof(struct sockaddr_in)); /* bzero() is deprecated, replaced with memset() */
625 addr->addr = (struct sockaddr *)s;
626 s->sin_family = AF_INET;
627 s->sin_addr.s_addr = *(bpf_u_int32 *)(ptr + 1); /* copy the address in */
628 ptr += *ptr; /* now move the pointer forwards according to the specified length of the address */
629 }
630 ptr++; /* then forwards one more for the 'length of the address' field */
631 if (*ptr) { /* process any netmask */
632 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
633 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
634 return -1;
635 }
636 /* bzero() is deprecated, replaced with memset() */
637 memset((char *)s, 0, sizeof(struct sockaddr_in));
638
639 addr->netmask = (struct sockaddr *)s;
640 s->sin_family = AF_INET;
641 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
642 ptr += *ptr;
643 }
644 ptr++;
645 if (*ptr) { /* process any broadcast address */
646 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
647 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
648 return -1;
649 }
650 /* bzero() is deprecated, replaced with memset() */
651 memset((char *)s, 0, sizeof(struct sockaddr_in));
652
653 addr->broadaddr = (struct sockaddr *)s;
654 s->sin_family = AF_INET;
655 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
656 ptr += *ptr;
657 }
658 ptr++;
659 if (*ptr) { /* process any destination address */
660 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
661 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
662 return -1;
663 }
664 /* bzero() is deprecated, replaced with memset() */
665 memset((char *)s, 0, sizeof(struct sockaddr_in));
666
667 addr->dstaddr = (struct sockaddr *)s;
668 s->sin_family = AF_INET;
669 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
670 ptr += *ptr;
671 }
672 ptr++;
673 prev_addr = addr;
674 }
675 prev_iff = iff;
676
677 newname = translate_IOP_to_pcap_name(u, iff->name, interfaceType); /* add a translation entry and get a point to the mangled name */
678 if ((iff->name = realloc(iff->name, strlen(newname) + 1)) == NULL) { /* we now re-write the name stored in the interface list */
679 snprintf(errbuf, PCAP_ERRBUF_SIZE, "realloc: %s", pcap_strerror(errno));
680 return -1;
681 }
682 strcpy(iff->name, newname); /* to this new name */
683 }
684 }
685 }
686 return 0;
687 }
688
689 static int read_client_data (int fd) {
690 unsigned char buf[256];
691 int chassis, geoslot;
692 unit_t *u;
693 int len;
694
695 find_unit_by_fd(fd, &chassis, &geoslot, &u);
696
697 if ((len = recv(fd, buf, sizeof(buf), 0)) <= 0) return 0; /* read in whatever data was sent to us */
698
699 if ((u->imsg = realloc(u->imsg, (u->len + len))) == NULL) /* extend the buffer for the new data */
700 return 0;
701 memcpy((u->imsg + u->len), buf, len); /* append the new data */
702 u->len += len;
703 return 1;
704 }
705
706 static void wait_for_all_answers(void) {
707 int retval;
708 struct timeval tv;
709 int fd;
710 int chassis, geoslot;
711
712 tv.tv_sec = 2;
713 tv.tv_usec = 0;
714
715 while (1) {
716 int flag = 0;
717 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of descriptors we may be listening to */
718 if (FD_ISSET(fd, &readfds)) flag = 1; /* and see if there are any still set */
719 }
720 if (flag == 0) return; /* we are done, when they are all gone */
721
722 memcpy(&working_set, &readfds, sizeof(readfds)); /* otherwise, we still have to listen for more stuff, till we timeout */
723 retval = select(max_fs + 1, &working_set, NULL, NULL, &tv);
724 if (retval == -1) { /* an error occured !!!!! */
725 return;
726 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */
727 printf("timeout\n");
728 return;
729 } else {
730 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of things to do, and do them */
731 if (FD_ISSET(fd, &working_set)) {
732 if (read_client_data(fd) == 0) { /* if the socket has closed */
733 FD_CLR(fd, &readfds); /* and descriptors we listen to for errors */
734 find_unit_by_fd(fd, &chassis, &geoslot, NULL);
735 close_with_IOP(chassis, geoslot, FIND); /* and close out connection to him */
736 }
737 }
738 }
739 }
740 }
741 }
742
743 static char *get_error_response(int fd, char *errbuf) { /* return a pointer on error, NULL on no error */
744 char byte;
745 int len = 0;
746
747 while (1) {
748 recv(fd, &byte, 1, 0); /* read another byte in */
749 if (errbuf && (len++ < PCAP_ERRBUF_SIZE)) { /* and if there is still room in the buffer */
750 *errbuf++ = byte; /* stick it in */
751 *errbuf = '\0'; /* ensure the string is null terminated just in case we might exceed the buffer's size */
752 }
753 if (byte == '\0') {
754 if (len > 1) { return errbuf; }
755 else { return NULL; }
756 }
757 }
758 }
759
760 int acn_findalldevs(char *errbuf) { /* returns: -1 = error, 0 = OK */
761 int chassis, geoslot;
762 unit_t *u;
763
764 FD_ZERO(&readfds);
765 max_fs = 0;
766 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
767 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
768 u = &units[chassis][geoslot];
769 if (u->ip && (open_with_IOP(u, FIND))) { /* connect to the remote IOP */
770 send_to_fd(u->find_fd, 1, (unsigned char *)"\0");
771 if (get_error_response(u->find_fd, errbuf))
772 close_with_IOP(chassis, geoslot, FIND);
773 else {
774 if (u->find_fd > max_fs)
775 max_fs = u->find_fd; /* remember the highest number currently in use */
776 FD_SET(u->find_fd, &readfds); /* we are going to want to read this guy's response to */
777 u->len = 0;
778 send_to_fd(u->find_fd, 1, (unsigned char *)"Q"); /* this interface query request */
779 }
780 }
781 }
782 }
783 wait_for_all_answers();
784 if (process_client_data(errbuf))
785 return -1;
786 sort_if_table();
787 return 0;
788 }
789
790 static int pcap_stats_acn(pcap_t *handle, struct pcap_stat *ps) {
791 unsigned char buf[12];
792
793 send_to_fd(handle->fd, 1, (unsigned char *)"S"); /* send the get_stats command to the IOP */
794
795 if (read_client_nbytes(handle->fd, sizeof(buf), buf) == -1) return -1; /* try reading the required bytes */
796
797 ps->ps_recv = ntohl(*(uint32_t *)&buf[0]); /* break the buffer into its three 32 bit components */
798 ps->ps_drop = ntohl(*(uint32_t *)&buf[4]);
799 ps->ps_ifdrop = ntohl(*(uint32_t *)&buf[8]);
800
801 return 0;
802 }
803
804 static int acn_open_live(const char *name, char *errbuf, int *linktype) { /* returns 0 on error, else returns the file descriptor */
805 int chassis, geoslot;
806 unit_t *u;
807 iface_t *p;
808 pcap_if_t *alldevsp;
809
810 pcap_findalldevs_interfaces(&alldevsp, errbuf);
811 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */
812 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
813 u = &units[chassis][geoslot];
814 if (u->ip != NULL) {
815 p = u->iface;
816 while (p) { /* and all interfaces... */
817 if (p->IOPname && p->name && (strcmp(p->name, name) == 0)) { /* and if we found the interface we want... */
818 *linktype = p->iftype;
819 open_with_IOP(u, LIVE); /* start a connection with that IOP */
820 send_to_fd(u->fd, strlen(p->IOPname)+1, (unsigned char *)p->IOPname); /* send the IOP's interface name, and a terminating null */
821 if (get_error_response(u->fd, errbuf)) {
822 return -1;
823 }
824 return u->fd; /* and return that open descriptor */
825 }
826 p = p->next;
827 }
828 }
829 }
830 }
831 return -1; /* if the interface wasn't found, return an error */
832 }
833
834 static void acn_start_monitor(int fd, int snaplen, int timeout, int promiscuous, int direction) {
835 unsigned char buf[8];
836 unit_t *u;
837
838 //printf("acn_start_monitor()\n"); // fulko
839 find_unit_by_fd(fd, NULL, NULL, &u);
840 if (u->first_time == 0) {
841 buf[0] = 'M';
842 *(uint32_t *)&buf[1] = htonl(snaplen);
843 buf[5] = timeout;
844 buf[6] = promiscuous;
845 buf[7] = direction;
846 //printf("acn_start_monitor() first time\n"); // fulko
847 send_to_fd(fd, 8, buf); /* send the start monitor command with its parameters to the IOP */
848 u->first_time = 1;
849 }
850 //printf("acn_start_monitor() complete\n"); // fulko
851 }
852
853 static int pcap_inject_acn(pcap_t *p, const void *buf _U_, size_t size _U_) {
854 strlcpy(p->errbuf, "Sending packets isn't supported on ACN adapters",
855 PCAP_ERRBUF_SIZE);
856 return (-1);
857 }
858
859 static int pcap_setfilter_acn(pcap_t *handle, struct bpf_program *bpf) {
860 int fd = handle->fd;
861 int count;
862 struct bpf_insn *p;
863 uint16_t shortInt;
864 uint32_t longInt;
865
866 send_to_fd(fd, 1, (unsigned char *)"F"); /* BPF filter follows command */
867 count = bpf->bf_len;
868 longInt = htonl(count);
869 send_to_fd(fd, 4, (unsigned char *)&longInt); /* send the instruction sequence count */
870 p = bpf->bf_insns;
871 while (count--) { /* followed by the list of instructions */
872 shortInt = htons(p->code);
873 longInt = htonl(p->k);
874 send_to_fd(fd, 2, (unsigned char *)&shortInt);
875 send_to_fd(fd, 1, (unsigned char *)&p->jt);
876 send_to_fd(fd, 1, (unsigned char *)&p->jf);
877 send_to_fd(fd, 4, (unsigned char *)&longInt);
878 p++;
879 }
880 if (get_error_response(fd, NULL))
881 return -1;
882 return 0;
883 }
884
885 static int pcap_setdirection_acn(pcap_t *handle, pcap_direction_t d) {
886 snprintf(handle->errbuf, sizeof(handle->errbuf),
887 "Setting direction is not supported on ACN adapters");
888 return -1;
889 }
890
891 static int acn_read_n_bytes_with_timeout(pcap_t *handle, int count) {
892 struct timeval tv;
893 int retval, fd;
894 fd_set r_fds;
895 fd_set w_fds;
896 u_char *bp;
897 int len = 0;
898 int offset = 0;
899
900 tv.tv_sec = 5;
901 tv.tv_usec = 0;
902
903 fd = handle->fd;
904 FD_ZERO(&r_fds);
905 FD_SET(fd, &r_fds);
906 memcpy(&w_fds, &r_fds, sizeof(r_fds));
907 bp = handle->bp;
908 while (count) {
909 retval = select(fd + 1, &w_fds, NULL, NULL, &tv);
910 if (retval == -1) { /* an error occured !!!!! */
911 // fprintf(stderr, "error during packet data read\n");
912 return -1; /* but we need to return a good indication to prevent unneccessary popups */
913 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */
914 // fprintf(stderr, "timeout during packet data read\n");
915 return -1;
916 } else {
917 if ((len = recv(fd, (bp + offset), count, 0)) <= 0) {
918 // fprintf(stderr, "premature exit during packet data rx\n");
919 return -1;
920 }
921 count -= len;
922 offset += len;
923 }
924 }
925 return 0;
926 }
927
928 static int pcap_read_acn(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) {
929 #define HEADER_SIZE (4 * 4)
930 unsigned char packet_header[HEADER_SIZE];
931 struct pcap_pkthdr pcap_header;
932
933 //printf("pcap_read_acn()\n"); // fulko
934 acn_start_monitor(handle->fd, handle->snapshot, handle->md.timeout, handle->md.clear_promisc, handle->direction); /* maybe tell him to start monitoring */
935 //printf("pcap_read_acn() after start monitor\n"); // fulko
936
937 handle->bp = packet_header;
938 if (acn_read_n_bytes_with_timeout(handle, HEADER_SIZE) == -1) return 0; /* try to read a packet header in so we can get the sizeof the packet data */
939
940 pcap_header.ts.tv_sec = ntohl(*(uint32_t *)&packet_header[0]); /* tv_sec */
941 pcap_header.ts.tv_usec = ntohl(*(uint32_t *)&packet_header[4]); /* tv_usec */
942 pcap_header.caplen = ntohl(*(uint32_t *)&packet_header[8]); /* caplen */
943 pcap_header.len = ntohl(*(uint32_t *)&packet_header[12]); /* len */
944
945 handle->bp = handle->buffer + handle->offset; /* start off the receive pointer at the right spot */
946 if (acn_read_n_bytes_with_timeout(handle, pcap_header.caplen) == -1) return 0; /* then try to read in the rest of the data */
947
948 callback(user, &pcap_header, handle->bp); /* call the user supplied callback function */
949 return 1;
950 }
951
952 static int pcap_activate_sita(pcap_t *handle) {
953 int fd;
954
955 if (handle->opt.rfmon) {
956 /*
957 * No monitor mode on SITA devices (they're not Wi-Fi
958 * devices).
959 */
960 return PCAP_ERROR_RFMON_NOTSUP;
961 }
962
963 /* Initialize some components of the pcap structure. */
964
965 handle->inject_op = pcap_inject_acn;
966 handle->setfilter_op = pcap_setfilter_acn;
967 handle->setdirection_op = pcap_setdirection_acn;
968 handle->set_datalink_op = NULL; /* can't change data link type */
969 handle->getnonblock_op = pcap_getnonblock_fd;
970 handle->setnonblock_op = pcap_setnonblock_fd;
971 handle->cleanup_op = pcap_cleanup_acn;
972 handle->read_op = pcap_read_acn;
973 handle->stats_op = pcap_stats_acn;
974
975 fd = acn_open_live(handle->opt.source, handle->errbuf,
976 &handle->linktype);
977 if (fd == -1)
978 return PCAP_ERROR;
979 handle->md.clear_promisc = handle->md.promisc;
980 handle->fd = fd;
981 handle->bufsize = handle->snapshot;
982
983 /* Allocate the buffer */
984
985 handle->buffer = malloc(handle->bufsize + handle->offset);
986 if (!handle->buffer) {
987 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
988 "malloc: %s", pcap_strerror(errno));
989 pcap_cleanup_acn(handle);
990 return PCAP_ERROR;
991 }
992
993 /*
994 * "handle->fd" is a socket, so "select()" and "poll()"
995 * should work on it.
996 */
997 handle->selectable_fd = handle->fd;
998
999 return 0;
1000 }
1001
1002 pcap_t *pcap_create_interface(const char *device, char *ebuf) {
1003 pcap_t *p;
1004
1005 p = pcap_create_common(device, ebuf);
1006 if (p == NULL)
1007 return (NULL);
1008
1009 p->activate_op = pcap_activate_sita;
1010 return (p);
1011 }
[mirror] the LIBpcap interface to various kernel packet capture mechanism