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[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 #ifdef HAVE_CONFIG_H
28 #include <config.h>
29 #endif
30
31 #include <stdio.h>
32 #include <string.h>
33 #include <stdlib.h>
34 #include <unistd.h>
35 #include <fcntl.h>
36 #include <errno.h>
37 #include <sys/time.h>
38 #include <sys/socket.h>
39 #include <netinet/in.h>
40 #include <arpa/inet.h>
41 #include "pcap-int.h"
42
43 #include "pcap-sita.h"
44
45 /* non-configureable manifests follow */
46
47 #define IOP_SNIFFER_PORT 49152 /* TCP port on the IOP used for 'distributed pcap' usage */
48 #define MAX_LINE_SIZE 255 /* max size of a buffer/line in /etc/hosts we allow */
49 #define MAX_CHASSIS 8 /* number of chassis in an ACN site */
50 #define MAX_GEOSLOT 8 /* max number of access units in an ACN site */
51
52 #define FIND 0
53 #define LIVE 1
54
55 typedef struct iface {
56 struct iface *next; /* a pointer to the next interface */
57 char *name; /* this interface's name */
58 char *IOPname; /* this interface's name on an IOP */
59 uint32_t iftype; /* the type of interface (DLT values) */
60 } iface_t;
61
62 typedef struct unit {
63 char *ip; /* this unit's IP address (as extracted from /etc/hosts) */
64 int fd; /* the connection to this unit (if it exists) */
65 int find_fd; /* a big kludge to avoid my programming limitations since I could have this unit open for findalldevs purposes */
66 int first_time; /* 0 = just opened via acn_open_live(), ie. the first time, NZ = nth time */
67 struct sockaddr_in *serv_addr; /* the address control block for comms to this unit */
68 int chassis;
69 int geoslot;
70 iface_t *iface; /* a pointer to a linked list of interface structures */
71 char *imsg; /* a pointer to an inbound message */
72 int len; /* the current size of the inbound message */
73 } unit_t;
74
75 static unit_t units[MAX_CHASSIS+1][MAX_GEOSLOT+1]; /* we use indexes of 1 through 8, but we reserve/waste index 0 */
76 static fd_set readfds; /* a place to store the file descriptors for the connections to the IOPs */
77 static int max_fs;
78
79 pcap_if_t *acn_if_list; /* pcap's list of available interfaces */
80
81 static void dump_interface_list(void) {
82 pcap_if_t *iff;
83 pcap_addr_t *addr;
84 int longest_name_len = 0;
85 char *n, *d, *f;
86 int if_number = 0;
87
88 iff = acn_if_list;
89 while (iff) {
90 if (iff->name && (strlen(iff->name) > longest_name_len)) longest_name_len = strlen(iff->name);
91 iff = iff->next;
92 }
93 iff = acn_if_list;
94 printf("Interface List:\n");
95 while (iff) {
96 n = (iff->name) ? iff->name : "";
97 d = (iff->description) ? iff->description : "";
98 f = (iff->flags == PCAP_IF_LOOPBACK) ? "L" : "";
99 printf("%3d: %*s %s '%s'\n", if_number++, longest_name_len, n, f, d);
100 addr = iff->addresses;
101 while (addr) {
102 printf("%*s ", (5 + longest_name_len), ""); /* add some indentation */
103 printf("%15s ", (addr->addr) ? inet_ntoa(((struct sockaddr_in *)addr->addr)->sin_addr) : "");
104 printf("%15s ", (addr->netmask) ? inet_ntoa(((struct sockaddr_in *)addr->netmask)->sin_addr) : "");
105 printf("%15s ", (addr->broadaddr) ? inet_ntoa(((struct sockaddr_in *)addr->broadaddr)->sin_addr) : "");
106 printf("%15s ", (addr->dstaddr) ? inet_ntoa(((struct sockaddr_in *)addr->dstaddr)->sin_addr) : "");
107 printf("\n");
108 addr = addr->next;
109 }
110 iff = iff->next;
111 }
112 }
113
114 static void dump(unsigned char *ptr, int i, int indent) {
115 fprintf(stderr, "%*s", indent, " ");
116 for (; i > 0; i--) {
117 fprintf(stderr, "%2.2x ", *ptr++);
118 }
119 fprintf(stderr, "\n");
120 }
121
122 static void dump_interface_list_p(void) {
123 pcap_if_t *iff;
124 pcap_addr_t *addr;
125 int if_number = 0;
126
127 iff = acn_if_list;
128 printf("Interface Pointer @ %p is %p:\n", &acn_if_list, iff);
129 while (iff) {
130 printf("%3d: %p %p next: %p\n", if_number++, iff->name, iff->description, iff->next);
131 dump((unsigned char *)iff, sizeof(pcap_if_t), 5);
132 addr = iff->addresses;
133 while (addr) {
134 printf(" %p %p %p %p, next: %p\n", addr->addr, addr->netmask, addr->broadaddr, addr->dstaddr, addr->next);
135 dump((unsigned char *)addr, sizeof(pcap_addr_t), 10);
136 addr = addr->next;
137 }
138 iff = iff->next;
139 }
140 }
141
142 static void dump_unit_table(void) {
143 int chassis, geoslot;
144 iface_t *p;
145
146 printf("%c:%c %s %s\n", 'C', 'S', "fd", "IP Address");
147 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
148 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
149 if (units[chassis][geoslot].ip != NULL)
150 printf("%d:%d %2d %s\n", chassis, geoslot, units[chassis][geoslot].fd, units[chassis][geoslot].ip);
151 p = units[chassis][geoslot].iface;
152 while (p) {
153 char *n = (p->name) ? p->name : "";
154 char *i = (p->IOPname) ? p->IOPname : "";
155 p = p->next;
156 printf(" %12s -> %12s\n", i, n);
157 }
158 }
159 }
160 }
161
162 static int find_unit_by_fd(int fd, int *chassis, int *geoslot, unit_t **unit_ptr) {
163 int c, s;
164
165 for (c = 0; c <= MAX_CHASSIS; c++) {
166 for (s = 0; s <= MAX_GEOSLOT; s++) {
167 if (units[c][s].fd == fd || units[c][s].find_fd == fd) {
168 if (chassis) *chassis = c;
169 if (geoslot) *geoslot = s;
170 if (unit_ptr) *unit_ptr = &units[c][s];
171 return 1;
172 }
173 }
174 }
175 return 0;
176 }
177
178 static int read_client_nbytes(int fd, int count, unsigned char *buf) {
179 unit_t *u;
180 int chassis, geoslot;
181 int len;
182
183 find_unit_by_fd(fd, &chassis, &geoslot, &u);
184 while (count) {
185 if ((len = recv(fd, buf, count, 0)) <= 0) return -1; /* read in whatever data was sent to us */
186 count -= len;
187 buf += len;
188 } /* till we have everything we are looking for */
189 return 0;
190 }
191
192 static void empty_unit_iface(unit_t *u) {
193 iface_t *p, *cur;
194
195 cur = u->iface;
196 while (cur) { /* loop over all the interface entries */
197 if (cur->name) free(cur->name); /* throwing away the contents if they exist */
198 if (cur->IOPname) free(cur->IOPname);
199 p = cur->next;
200 free(cur); /* then throw away the structure itself */
201 cur = p;
202 }
203 u->iface = 0; /* and finally remember that there are no remaining structure */
204 }
205
206 static void empty_unit(int chassis, int geoslot) {
207 unit_t *u = &units[chassis][geoslot];
208
209 empty_unit_iface(u);
210 if (u->imsg) { /* then if an inbound message buffer exists */
211 void *bigger_buffer;
212
213 bigger_buffer = (char *)realloc(u->imsg, 1); /* and re-allocate the old large buffer into a new small one */
214 if (bigger_buffer == NULL) { /* oops, realloc call failed */
215 fprintf(stderr, "Warning...call to realloc() failed, value of errno is %d\n", errno);
216 return;
217 }
218 u->imsg = bigger_buffer;
219 }
220 }
221
222 static void empty_unit_table(void) {
223 int chassis, geoslot;
224
225 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
226 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
227 if (units[chassis][geoslot].ip != NULL) {
228 free(units[chassis][geoslot].ip); /* get rid of the malloc'ed space that holds the IP address */
229 units[chassis][geoslot].ip = 0; /* then set the pointer to NULL */
230 }
231 empty_unit(chassis, geoslot);
232 }
233 }
234 }
235
236 static char *find_nth_interface_name(int n) {
237 int chassis, geoslot;
238 iface_t *p;
239 char *last_name = 0;
240
241 if (n < 0) n = 0; /* ensure we are working with a valid number */
242 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */
243 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
244 if (units[chassis][geoslot].ip != NULL) {
245 p = units[chassis][geoslot].iface;
246 while (p) { /* and all interfaces... */
247 if (p->IOPname) last_name = p->name; /* remembering the last name found */
248 if (n-- == 0) return last_name; /* and if we hit the instance requested */
249 p = p->next;
250 }
251 }
252 }
253 }
254 /* if we couldn't fine the selected entry */
255 if (last_name) return last_name; /* ... but we did have at least one entry... return the last entry found */
256 return ""; /* ... but if there wasn't any entry... return an empty string instead */
257 }
258
259 int acn_parse_hosts_file(char *errbuf) { /* returns: -1 = error, 0 = OK */
260 FILE *fp;
261 char buf[MAX_LINE_SIZE];
262 char *ptr, *ptr2;
263 int pos;
264 int chassis, geoslot;
265 unit_t *u;
266
267 empty_unit_table();
268 if ((fp = fopen("/etc/hosts", "r")) == NULL) { /* try to open the hosts file and if it fails */
269 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot open '/etc/hosts' for reading."); /* return the nohostsfile error response */
270 return -1;
271 }
272 while (fgets(buf, MAX_LINE_SIZE-1, fp)) { /* while looping over the file */
273
274 pos = strcspn(buf, "#\n\r"); /* find the first comment character or EOL */
275 *(buf + pos) = '\0'; /* and clobber it and anything that follows it */
276
277 pos = strspn(buf, " \t"); /* then find the first non-white space */
278 if (pos == strlen(buf)) /* if there is nothing but white space on the line */
279 continue; /* ignore that empty line */
280 ptr = buf + pos; /* and skip over any of that leading whitespace */
281
282 if ((ptr2 = strstr(ptr, "_I_")) == NULL) /* skip any lines that don't have names that look like they belong to IOPs */
283 continue;
284 if (*(ptr2 + 4) != '_') /* and skip other lines that have names that don't look like ACN components */
285 continue;
286 *(ptr + strcspn(ptr, " \t")) = '\0'; /* null terminate the IP address so its a standalone string */
287
288 chassis = *(ptr2 + 3) - '0'; /* extract the chassis number */
289 geoslot = *(ptr2 + 5) - '0'; /* and geo-slot number */
290 if (chassis < 1 || chassis > MAX_CHASSIS ||
291 geoslot < 1 || geoslot > MAX_GEOSLOT) { /* if the chassis and/or slot numbers appear to be bad... */
292 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "Invalid ACN name in '/etc/hosts'."); /* warn the user */
293 continue; /* and ignore the entry */
294 }
295 if ((ptr2 = (char *)malloc(strlen(ptr) + 1)) == NULL) {
296 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
297 errno, "malloc");
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 void nonUnified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u) {
409
410 pcap_snprintf(buf, bufsize, "%s_%d_%d", proto, u->chassis, u->geoslot);
411 }
412
413 static void unified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u, int IOPportnum) {
414 int portnum;
415
416 portnum = ((u->chassis - 1) * 64) + ((u->geoslot - 1) * 8) + IOPportnum + 1;
417 pcap_snprintf(buf, bufsize, "%s_%d", proto, portnum);
418 }
419
420 static char *translate_IOP_to_pcap_name(unit_t *u, char *IOPname, bpf_u_int32 iftype) {
421 iface_t *iface_ptr, *iface;
422 char *name;
423 char buf[32];
424 char *proto;
425 char *port;
426 int IOPportnum = 0;
427
428 iface = malloc(sizeof(iface_t)); /* get memory for a structure */
429 if (iface == NULL) { /* oops, we didn't get the memory requested */
430 fprintf(stderr, "Error...couldn't allocate memory for interface structure...value of errno is: %d\n", errno);
431 return NULL;
432 }
433 memset((char *)iface, 0, sizeof(iface_t)); /* bzero is deprecated(), replaced with memset() */
434
435 iface->iftype = iftype; /* remember the interface type of this interface */
436
437 name = malloc(strlen(IOPname) + 1); /* get memory for the IOP's name */
438 if (name == NULL) { /* oops, we didn't get the memory requested */
439 fprintf(stderr, "Error...couldn't allocate memory for IOPname...value of errno is: %d\n", errno);
440 return NULL;
441 }
442
443 strcpy(name, IOPname); /* and copy it in */
444 iface->IOPname = name; /* and stick it into the structure */
445
446 if (strncmp(IOPname, "lo", 2) == 0) {
447 IOPportnum = atoi(&IOPname[2]);
448 switch (iftype) {
449 case DLT_EN10MB:
450 nonUnified_IOP_port_name(buf, sizeof buf, "lo", u);
451 break;
452 default:
453 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
454 break;
455 }
456 } else if (strncmp(IOPname, "eth", 3) == 0) {
457 IOPportnum = atoi(&IOPname[3]);
458 switch (iftype) {
459 case DLT_EN10MB:
460 nonUnified_IOP_port_name(buf, sizeof buf, "eth", u);
461 break;
462 default:
463 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
464 break;
465 }
466 } else if (strncmp(IOPname, "wan", 3) == 0) {
467 IOPportnum = atoi(&IOPname[3]);
468 switch (iftype) {
469 case DLT_SITA:
470 unified_IOP_port_name(buf, sizeof buf, "wan", u, IOPportnum);
471 break;
472 default:
473 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
474 break;
475 }
476 } else {
477 fprintf(stderr, "Error... invalid IOP name %s\n", IOPname);
478 return NULL;
479 }
480
481 name = malloc(strlen(buf) + 1); /* get memory for that name */
482 if (name == NULL) { /* oops, we didn't get the memory requested */
483 fprintf(stderr, "Error...couldn't allocate memory for IOP port name...value of errno is: %d\n", errno);
484 return NULL;
485 }
486
487 strcpy(name, buf); /* and copy it in */
488 iface->name = name; /* and stick it into the structure */
489
490 if (u->iface == 0) { /* if this is the first name */
491 u->iface = iface; /* stick this entry at the head of the list */
492 } else {
493 iface_ptr = u->iface;
494 while (iface_ptr->next) { /* othewise scan the list */
495 iface_ptr = iface_ptr->next; /* till we're at the last entry */
496 }
497 iface_ptr->next = iface; /* then tack this entry on the end of the list */
498 }
499 return iface->name;
500 }
501
502 static int if_sort(char *s1, char *s2) {
503 char *s1_p2, *s2_p2;
504 char str1[MAX_LINE_SIZE], str2[MAX_LINE_SIZE];
505 int s1_p1_len, s2_p1_len;
506 int retval;
507
508 if ((s1_p2 = strchr(s1, '_'))) { /* if an underscore is found... */
509 s1_p1_len = s1_p2 - s1; /* the prefix length is the difference in pointers */
510 s1_p2++; /* the suffix actually starts _after_ the underscore */
511 } else { /* otherwise... */
512 s1_p1_len = strlen(s1); /* the prefix length is the length of the string itself */
513 s1_p2 = 0; /* and there is no suffix */
514 }
515 if ((s2_p2 = strchr(s2, '_'))) { /* now do the same for the second string */
516 s2_p1_len = s2_p2 - s2;
517 s2_p2++;
518 } else {
519 s2_p1_len = strlen(s2);
520 s2_p2 = 0;
521 }
522 strncpy(str1, s1, (s1_p1_len > sizeof(str1)) ? s1_p1_len : sizeof(str1)); *(str1 + s1_p1_len) = 0;
523 strncpy(str2, s2, (s2_p1_len > sizeof(str2)) ? s2_p1_len : sizeof(str2)); *(str2 + s2_p1_len) = 0;
524 retval = strcmp(str1, str2);
525 if (retval != 0) return retval; /* if they are not identical, then we can quit now and return the indication */
526 return strcmp(s1_p2, s2_p2); /* otherwise we return the result of comparing the 2nd half of the string */
527 }
528
529 static void sort_if_table(void) {
530 pcap_if_t *p1, *p2, *prev, *temp;
531 int has_swapped;
532
533 if (!acn_if_list) return; /* nothing to do if the list is empty */
534
535 while (1) {
536 p1 = acn_if_list; /* start at the head of the list */
537 prev = 0;
538 has_swapped = 0;
539 while ((p2 = p1->next)) {
540 if (if_sort(p1->name, p2->name) > 0) {
541 if (prev) { /* we are swapping things that are _not_ at the head of the list */
542 temp = p2->next;
543 prev->next = p2;
544 p2->next = p1;
545 p1->next = temp;
546 } else { /* special treatment if we are swapping with the head of the list */
547 temp = p2->next;
548 acn_if_list= p2;
549 p2->next = p1;
550 p1->next = temp;
551 }
552 p1 = p2;
553 prev = p1;
554 has_swapped = 1;
555 }
556 prev = p1;
557 p1 = p1->next;
558 }
559 if (has_swapped == 0)
560 return;
561 }
562 return;
563 }
564
565 static int process_client_data (char *errbuf) { /* returns: -1 = error, 0 = OK */
566 int chassis, geoslot;
567 unit_t *u;
568 pcap_if_t *iff, *prev_iff;
569 pcap_addr_t *addr, *prev_addr;
570 char *ptr;
571 int address_count;
572 struct sockaddr_in *s;
573 char *newname;
574 bpf_u_int32 interfaceType;
575 unsigned char flags;
576 void *bigger_buffer;
577
578 prev_iff = 0;
579 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
580 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { /* now loop over all the devices */
581 u = &units[chassis][geoslot];
582 empty_unit_iface(u);
583 ptr = u->imsg; /* point to the start of the msg for this IOP */
584 while (ptr < (u->imsg + u->len)) {
585 if ((iff = malloc(sizeof(pcap_if_t))) == NULL) {
586 pcap_fmt_errmsg_for_errno(errbuf,
587 PCAP_ERRBUF_SIZE, errno, "malloc");
588 return -1;
589 }
590 memset((char *)iff, 0, sizeof(pcap_if_t)); /* bzero() is deprecated, replaced with memset() */
591 if (acn_if_list == 0) acn_if_list = iff; /* remember the head of the list */
592 if (prev_iff) prev_iff->next = iff; /* insert a forward link */
593
594 if (*ptr) { /* if there is a count for the name */
595 if ((iff->name = malloc(*ptr + 1)) == NULL) { /* get that amount of space */
596 pcap_fmt_errmsg_for_errno(errbuf,
597 PCAP_ERRBUF_SIZE, errno,
598 "malloc");
599 return -1;
600 }
601 memcpy(iff->name, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */
602 *(iff->name + *ptr) = 0; /* and null terminate the string */
603 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */
604 }
605 ptr++;
606
607 if (*ptr) { /* if there is a count for the description */
608 if ((iff->description = malloc(*ptr + 1)) == NULL) { /* get that amount of space */
609 pcap_fmt_errmsg_for_errno(errbuf,
610 PCAP_ERRBUF_SIZE, errno,
611 "malloc");
612 return -1;
613 }
614 memcpy(iff->description, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */
615 *(iff->description + *ptr) = 0; /* and null terminate the string */
616 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */
617 }
618 ptr++;
619
620 interfaceType = ntohl(*(bpf_u_int32 *)ptr);
621 ptr += 4; /* skip over the interface type */
622
623 flags = *ptr++;
624 if (flags) iff->flags = PCAP_IF_LOOPBACK; /* if this is a loopback style interface, lets mark it as such */
625
626 address_count = *ptr++;
627
628 prev_addr = 0;
629 while (address_count--) {
630 if ((addr = malloc(sizeof(pcap_addr_t))) == NULL) {
631 pcap_fmt_errmsg_for_errno(errbuf,
632 PCAP_ERRBUF_SIZE, errno,
633 "malloc");
634 return -1;
635 }
636 memset((char *)addr, 0, sizeof(pcap_addr_t)); /* bzero() is deprecated, replaced with memset() */
637 if (iff->addresses == 0) iff->addresses = addr;
638 if (prev_addr) prev_addr->next = addr; /* insert a forward link */
639 if (*ptr) { /* if there is a count for the address */
640 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { /* get that amount of space */
641 pcap_fmt_errmsg_for_errno(errbuf,
642 PCAP_ERRBUF_SIZE,
643 errno, "malloc");
644 return -1;
645 }
646 memset((char *)s, 0, sizeof(struct sockaddr_in)); /* bzero() is deprecated, replaced with memset() */
647 addr->addr = (struct sockaddr *)s;
648 s->sin_family = AF_INET;
649 s->sin_addr.s_addr = *(bpf_u_int32 *)(ptr + 1); /* copy the address in */
650 ptr += *ptr; /* now move the pointer forwards according to the specified length of the address */
651 }
652 ptr++; /* then forwards one more for the 'length of the address' field */
653 if (*ptr) { /* process any netmask */
654 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
655 pcap_fmt_errmsg_for_errno(errbuf,
656 PCAP_ERRBUF_SIZE,
657 errno, "malloc");
658 return -1;
659 }
660 /* bzero() is deprecated, replaced with memset() */
661 memset((char *)s, 0, sizeof(struct sockaddr_in));
662
663 addr->netmask = (struct sockaddr *)s;
664 s->sin_family = AF_INET;
665 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
666 ptr += *ptr;
667 }
668 ptr++;
669 if (*ptr) { /* process any broadcast address */
670 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
671 pcap_fmt_errmsg_for_errno(errbuf,
672 PCAP_ERRBUF_SIZE,
673 errno, "malloc");
674 return -1;
675 }
676 /* bzero() is deprecated, replaced with memset() */
677 memset((char *)s, 0, sizeof(struct sockaddr_in));
678
679 addr->broadaddr = (struct sockaddr *)s;
680 s->sin_family = AF_INET;
681 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
682 ptr += *ptr;
683 }
684 ptr++;
685 if (*ptr) { /* process any destination address */
686 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
687 pcap_fmt_errmsg_for_errno(errbuf,
688 PCAP_ERRBUF_SIZE,
689 errno, "malloc");
690 return -1;
691 }
692 /* bzero() is deprecated, replaced with memset() */
693 memset((char *)s, 0, sizeof(struct sockaddr_in));
694
695 addr->dstaddr = (struct sockaddr *)s;
696 s->sin_family = AF_INET;
697 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
698 ptr += *ptr;
699 }
700 ptr++;
701 prev_addr = addr;
702 }
703 prev_iff = iff;
704
705 newname = translate_IOP_to_pcap_name(u, iff->name, interfaceType); /* add a translation entry and get a point to the mangled name */
706 bigger_buffer = realloc(iff->name, strlen(newname) + 1));
707 if (bigger_buffer == NULL) { /* we now re-write the name stored in the interface list */
708 pcap_fmt_errmsg_for_errno(errbuf,
709 PCAP_ERRBUF_SIZE, errno, "realloc");
710 return -1;
711 }
712 iff->name = bigger_buffer;
713 strcpy(iff->name, newname); /* to this new name */
714 }
715 }
716 }
717 return 0;
718 }
719
720 static int read_client_data (int fd) {
721 unsigned char buf[256];
722 int chassis, geoslot;
723 unit_t *u;
724 int len;
725
726 find_unit_by_fd(fd, &chassis, &geoslot, &u);
727
728 if ((len = recv(fd, buf, sizeof(buf), 0)) <= 0) return 0; /* read in whatever data was sent to us */
729
730 if ((u->imsg = realloc(u->imsg, (u->len + len))) == NULL) /* extend the buffer for the new data */
731 return 0;
732 memcpy((u->imsg + u->len), buf, len); /* append the new data */
733 u->len += len;
734 return 1;
735 }
736
737 static void wait_for_all_answers(void) {
738 int retval;
739 struct timeval tv;
740 int fd;
741 int chassis, geoslot;
742
743 tv.tv_sec = 2;
744 tv.tv_usec = 0;
745
746 while (1) {
747 int flag = 0;
748 fd_set working_set;
749
750 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of descriptors we may be listening to */
751 if (FD_ISSET(fd, &readfds)) flag = 1; /* and see if there are any still set */
752 }
753 if (flag == 0) return; /* we are done, when they are all gone */
754
755 memcpy(&working_set, &readfds, sizeof(readfds)); /* otherwise, we still have to listen for more stuff, till we timeout */
756 retval = select(max_fs + 1, &working_set, NULL, NULL, &tv);
757 if (retval == -1) { /* an error occured !!!!! */
758 return;
759 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */
760 printf("timeout\n");
761 return;
762 } else {
763 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of things to do, and do them */
764 if (FD_ISSET(fd, &working_set)) {
765 if (read_client_data(fd) == 0) { /* if the socket has closed */
766 FD_CLR(fd, &readfds); /* and descriptors we listen to for errors */
767 find_unit_by_fd(fd, &chassis, &geoslot, NULL);
768 close_with_IOP(chassis, geoslot, FIND); /* and close out connection to him */
769 }
770 }
771 }
772 }
773 }
774 }
775
776 static char *get_error_response(int fd, char *errbuf) { /* return a pointer on error, NULL on no error */
777 char byte;
778 int len = 0;
779
780 while (1) {
781 recv(fd, &byte, 1, 0); /* read another byte in */
782 if (errbuf && (len++ < PCAP_ERRBUF_SIZE)) { /* and if there is still room in the buffer */
783 *errbuf++ = byte; /* stick it in */
784 *errbuf = '\0'; /* ensure the string is null terminated just in case we might exceed the buffer's size */
785 }
786 if (byte == '\0') {
787 if (len > 1) { return errbuf; }
788 else { return NULL; }
789 }
790 }
791 }
792
793 int acn_findalldevs(char *errbuf) { /* returns: -1 = error, 0 = OK */
794 int chassis, geoslot;
795 unit_t *u;
796
797 FD_ZERO(&readfds);
798 max_fs = 0;
799 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
800 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
801 u = &units[chassis][geoslot];
802 if (u->ip && (open_with_IOP(u, FIND))) { /* connect to the remote IOP */
803 send_to_fd(u->find_fd, 1, (unsigned char *)"\0");
804 if (get_error_response(u->find_fd, errbuf))
805 close_with_IOP(chassis, geoslot, FIND);
806 else {
807 if (u->find_fd > max_fs)
808 max_fs = u->find_fd; /* remember the highest number currently in use */
809 FD_SET(u->find_fd, &readfds); /* we are going to want to read this guy's response to */
810 u->len = 0;
811 send_to_fd(u->find_fd, 1, (unsigned char *)"Q"); /* this interface query request */
812 }
813 }
814 }
815 }
816 wait_for_all_answers();
817 if (process_client_data(errbuf))
818 return -1;
819 sort_if_table();
820 return 0;
821 }
822
823 static int pcap_stats_acn(pcap_t *handle, struct pcap_stat *ps) {
824 unsigned char buf[12];
825
826 send_to_fd(handle->fd, 1, (unsigned char *)"S"); /* send the get_stats command to the IOP */
827
828 if (read_client_nbytes(handle->fd, sizeof(buf), buf) == -1) return -1; /* try reading the required bytes */
829
830 ps->ps_recv = ntohl(*(uint32_t *)&buf[0]); /* break the buffer into its three 32 bit components */
831 ps->ps_drop = ntohl(*(uint32_t *)&buf[4]);
832 ps->ps_ifdrop = ntohl(*(uint32_t *)&buf[8]);
833
834 return 0;
835 }
836
837 static int acn_open_live(const char *name, char *errbuf, int *linktype) { /* returns 0 on error, else returns the file descriptor */
838 int chassis, geoslot;
839 unit_t *u;
840 iface_t *p;
841 pcap_if_list_t devlist;
842
843 pcap_platform_finddevs(&devlist, errbuf);
844 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */
845 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
846 u = &units[chassis][geoslot];
847 if (u->ip != NULL) {
848 p = u->iface;
849 while (p) { /* and all interfaces... */
850 if (p->IOPname && p->name && (strcmp(p->name, name) == 0)) { /* and if we found the interface we want... */
851 *linktype = p->iftype;
852 open_with_IOP(u, LIVE); /* start a connection with that IOP */
853 send_to_fd(u->fd, strlen(p->IOPname)+1, (unsigned char *)p->IOPname); /* send the IOP's interface name, and a terminating null */
854 if (get_error_response(u->fd, errbuf)) {
855 return -1;
856 }
857 return u->fd; /* and return that open descriptor */
858 }
859 p = p->next;
860 }
861 }
862 }
863 }
864 return -1; /* if the interface wasn't found, return an error */
865 }
866
867 static void acn_start_monitor(int fd, int snaplen, int timeout, int promiscuous, int direction) {
868 unsigned char buf[8];
869 unit_t *u;
870
871 //printf("acn_start_monitor()\n"); // fulko
872 find_unit_by_fd(fd, NULL, NULL, &u);
873 if (u->first_time == 0) {
874 buf[0] = 'M';
875 *(uint32_t *)&buf[1] = htonl(snaplen);
876 buf[5] = timeout;
877 buf[6] = promiscuous;
878 buf[7] = direction;
879 //printf("acn_start_monitor() first time\n"); // fulko
880 send_to_fd(fd, 8, buf); /* send the start monitor command with its parameters to the IOP */
881 u->first_time = 1;
882 }
883 //printf("acn_start_monitor() complete\n"); // fulko
884 }
885
886 static int pcap_inject_acn(pcap_t *p, const void *buf _U_, int size _U_) {
887 pcap_strlcpy(p->errbuf, "Sending packets isn't supported on ACN adapters",
888 PCAP_ERRBUF_SIZE);
889 return (-1);
890 }
891
892 static int pcap_setfilter_acn(pcap_t *handle, struct bpf_program *bpf) {
893 int fd = handle->fd;
894 int count;
895 struct bpf_insn *p;
896 uint16_t shortInt;
897 uint32_t longInt;
898
899 send_to_fd(fd, 1, (unsigned char *)"F"); /* BPF filter follows command */
900 count = bpf->bf_len;
901 longInt = htonl(count);
902 send_to_fd(fd, 4, (unsigned char *)&longInt); /* send the instruction sequence count */
903 p = bpf->bf_insns;
904 while (count--) { /* followed by the list of instructions */
905 shortInt = htons(p->code);
906 longInt = htonl(p->k);
907 send_to_fd(fd, 2, (unsigned char *)&shortInt);
908 send_to_fd(fd, 1, (unsigned char *)&p->jt);
909 send_to_fd(fd, 1, (unsigned char *)&p->jf);
910 send_to_fd(fd, 4, (unsigned char *)&longInt);
911 p++;
912 }
913 if (get_error_response(fd, NULL))
914 return -1;
915 return 0;
916 }
917
918 static int pcap_setdirection_acn(pcap_t *handle, pcap_direction_t d) {
919 pcap_snprintf(handle->errbuf, sizeof(handle->errbuf),
920 "Setting direction is not supported on ACN adapters");
921 return -1;
922 }
923
924 static int acn_read_n_bytes_with_timeout(pcap_t *handle, int count) {
925 struct timeval tv;
926 int retval, fd;
927 fd_set r_fds;
928 fd_set w_fds;
929 u_char *bp;
930 int len = 0;
931 int offset = 0;
932
933 tv.tv_sec = 5;
934 tv.tv_usec = 0;
935
936 fd = handle->fd;
937 FD_ZERO(&r_fds);
938 FD_SET(fd, &r_fds);
939 memcpy(&w_fds, &r_fds, sizeof(r_fds));
940 bp = handle->bp;
941 while (count) {
942 retval = select(fd + 1, &w_fds, NULL, NULL, &tv);
943 if (retval == -1) { /* an error occured !!!!! */
944 // fprintf(stderr, "error during packet data read\n");
945 return -1; /* but we need to return a good indication to prevent unneccessary popups */
946 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */
947 // fprintf(stderr, "timeout during packet data read\n");
948 return -1;
949 } else {
950 if ((len = recv(fd, (bp + offset), count, 0)) <= 0) {
951 // fprintf(stderr, "premature exit during packet data rx\n");
952 return -1;
953 }
954 count -= len;
955 offset += len;
956 }
957 }
958 return 0;
959 }
960
961 static int pcap_read_acn(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) {
962 #define HEADER_SIZE (4 * 4)
963 unsigned char packet_header[HEADER_SIZE];
964 struct pcap_pkthdr pcap_header;
965
966 //printf("pcap_read_acn()\n"); // fulko
967 acn_start_monitor(handle->fd, handle->snapshot, handle->opt.timeout, handle->opt.promisc, handle->direction); /* maybe tell him to start monitoring */
968 //printf("pcap_read_acn() after start monitor\n"); // fulko
969
970 handle->bp = packet_header;
971 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 */
972
973 pcap_header.ts.tv_sec = ntohl(*(uint32_t *)&packet_header[0]); /* tv_sec */
974 pcap_header.ts.tv_usec = ntohl(*(uint32_t *)&packet_header[4]); /* tv_usec */
975 pcap_header.caplen = ntohl(*(uint32_t *)&packet_header[8]); /* caplen */
976 pcap_header.len = ntohl(*(uint32_t *)&packet_header[12]); /* len */
977
978 handle->bp = (u_char *)handle->buffer + handle->offset; /* start off the receive pointer at the right spot */
979 if (acn_read_n_bytes_with_timeout(handle, pcap_header.caplen) == -1) return 0; /* then try to read in the rest of the data */
980
981 callback(user, &pcap_header, handle->bp); /* call the user supplied callback function */
982 return 1;
983 }
984
985 static int pcap_activate_sita(pcap_t *handle) {
986 int fd;
987
988 if (handle->opt.rfmon) {
989 /*
990 * No monitor mode on SITA devices (they're not Wi-Fi
991 * devices).
992 */
993 return PCAP_ERROR_RFMON_NOTSUP;
994 }
995
996 /* Initialize some components of the pcap structure. */
997
998 handle->inject_op = pcap_inject_acn;
999 handle->setfilter_op = pcap_setfilter_acn;
1000 handle->setdirection_op = pcap_setdirection_acn;
1001 handle->set_datalink_op = NULL; /* can't change data link type */
1002 handle->getnonblock_op = pcap_getnonblock_fd;
1003 handle->setnonblock_op = pcap_setnonblock_fd;
1004 handle->cleanup_op = pcap_cleanup_acn;
1005 handle->read_op = pcap_read_acn;
1006 handle->stats_op = pcap_stats_acn;
1007
1008 fd = acn_open_live(handle->opt.device, handle->errbuf,
1009 &handle->linktype);
1010 if (fd == -1)
1011 return PCAP_ERROR;
1012
1013 /*
1014 * Turn a negative snapshot value (invalid), a snapshot value of
1015 * 0 (unspecified), or a value bigger than the normal maximum
1016 * value, into the maximum allowed value.
1017 *
1018 * If some application really *needs* a bigger snapshot
1019 * length, we should just increase MAXIMUM_SNAPLEN.
1020 */
1021 if (handle->snapshot <= 0 || handle->snapshot > MAXIMUM_SNAPLEN)
1022 handle->snapshot = MAXIMUM_SNAPLEN;
1023
1024 handle->fd = fd;
1025 handle->bufsize = handle->snapshot;
1026
1027 /* Allocate the buffer */
1028
1029 handle->buffer = malloc(handle->bufsize + handle->offset);
1030 if (!handle->buffer) {
1031 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
1032 errno, "malloc");
1033 pcap_cleanup_acn(handle);
1034 return PCAP_ERROR;
1035 }
1036
1037 /*
1038 * "handle->fd" is a socket, so "select()" and "poll()"
1039 * should work on it.
1040 */
1041 handle->selectable_fd = handle->fd;
1042
1043 return 0;
1044 }
1045
1046 pcap_t *pcap_create_interface(const char *device _U_, char *ebuf) {
1047 pcap_t *p;
1048
1049 p = pcap_create_common(ebuf, 0);
1050 if (p == NULL)
1051 return (NULL);
1052
1053 p->activate_op = pcap_activate_sita;
1054 return (p);
1055 }
1056
1057 int pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf) {
1058
1059 //printf("pcap_findalldevs()\n"); // fulko
1060
1061 *alldevsp = 0; /* initialize the returned variables before we do anything */
1062 strcpy(errbuf, "");
1063 if (acn_parse_hosts_file(errbuf)) /* scan the hosts file for potential IOPs */
1064 {
1065 //printf("pcap_findalldevs() returning BAD after parsehosts\n"); // fulko
1066 return -1;
1067 }
1068 //printf("pcap_findalldevs() got hostlist now finding devs\n"); // fulko
1069 if (acn_findalldevs(errbuf)) /* then ask the IOPs for their monitorable devices */
1070 {
1071 //printf("pcap_findalldevs() returning BAD after findalldevs\n"); // fulko
1072 return -1;
1073 }
1074 devlistp->beginning = acn_if_list;
1075 acn_if_list = 0; /* then forget our list head, because someone will call pcap_freealldevs() to empty the malloc'ed stuff */
1076 //printf("pcap_findalldevs() returning ZERO OK\n"); // fulko
1077 return 0;
1078 }
1079
1080 /*
1081 * Libpcap version string.
1082 */
1083 const char *
1084 pcap_lib_version(void)
1085 {
1086 return PCAP_VERSION_STRING " (SITA-only)";
1087 }
[mirror] the LIBpcap interface to various kernel packet capture mechanism