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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 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 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Invalid ACN name in '/etc/hosts'."); /* warn the user */
293 continue; /* and ignore the entry */
294 }
295 ptr2 = strdup(ptr); /* copy the IP address into our malloc'ed memory */
296 if (ptr2 == NULL) {
297 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
298 errno, "malloc");
299 continue;
300 }
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 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 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 buf[32];
423 char *proto;
424 char *port;
425 int IOPportnum = 0;
426
427 iface = malloc(sizeof(iface_t)); /* get memory for a structure */
428 if (iface == NULL) { /* oops, we didn't get the memory requested */
429 fprintf(stderr, "Error...couldn't allocate memory for interface structure...value of errno is: %d\n", errno);
430 return NULL;
431 }
432 memset((char *)iface, 0, sizeof(iface_t)); /* bzero is deprecated(), replaced with memset() */
433
434 iface->iftype = iftype; /* remember the interface type of this interface */
435
436 iface->IOPname = strdup(IOPnam); /* copy it and stick it into the structure */
437 if (iface->IOPname == NULL) { /* oops, we didn't get the memory requested */
438 fprintf(stderr, "Error...couldn't allocate memory for IOPname...value of errno is: %d\n", errno);
439 return NULL;
440 }
441
442 if (strncmp(IOPname, "lo", 2) == 0) {
443 IOPportnum = atoi(&IOPname[2]);
444 switch (iftype) {
445 case DLT_EN10MB:
446 nonUnified_IOP_port_name(buf, sizeof buf, "lo", u);
447 break;
448 default:
449 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
450 break;
451 }
452 } else if (strncmp(IOPname, "eth", 3) == 0) {
453 IOPportnum = atoi(&IOPname[3]);
454 switch (iftype) {
455 case DLT_EN10MB:
456 nonUnified_IOP_port_name(buf, sizeof buf, "eth", u);
457 break;
458 default:
459 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
460 break;
461 }
462 } else if (strncmp(IOPname, "wan", 3) == 0) {
463 IOPportnum = atoi(&IOPname[3]);
464 switch (iftype) {
465 case DLT_SITA:
466 unified_IOP_port_name(buf, sizeof buf, "wan", u, IOPportnum);
467 break;
468 default:
469 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
470 break;
471 }
472 } else {
473 fprintf(stderr, "Error... invalid IOP name %s\n", IOPname);
474 return NULL;
475 }
476
477 iface->name = strdup(buf); /* make a copy and stick it into the structure */
478 if (iface->name == NULL) { /* oops, we didn't get the memory requested */
479 fprintf(stderr, "Error...couldn't allocate memory for IOP port name...value of errno is: %d\n", errno);
480 return NULL;
481 }
482
483 if (u->iface == 0) { /* if this is the first name */
484 u->iface = iface; /* stick this entry at the head of the list */
485 } else {
486 iface_ptr = u->iface;
487 while (iface_ptr->next) { /* othewise scan the list */
488 iface_ptr = iface_ptr->next; /* till we're at the last entry */
489 }
490 iface_ptr->next = iface; /* then tack this entry on the end of the list */
491 }
492 return iface->name;
493 }
494
495 static int if_sort(char *s1, char *s2) {
496 char *s1_p2, *s2_p2;
497 char str1[MAX_LINE_SIZE], str2[MAX_LINE_SIZE];
498 int s1_p1_len, s2_p1_len;
499 int retval;
500
501 if ((s1_p2 = strchr(s1, '_'))) { /* if an underscore is found... */
502 s1_p1_len = s1_p2 - s1; /* the prefix length is the difference in pointers */
503 s1_p2++; /* the suffix actually starts _after_ the underscore */
504 } else { /* otherwise... */
505 s1_p1_len = strlen(s1); /* the prefix length is the length of the string itself */
506 s1_p2 = 0; /* and there is no suffix */
507 }
508 if ((s2_p2 = strchr(s2, '_'))) { /* now do the same for the second string */
509 s2_p1_len = s2_p2 - s2;
510 s2_p2++;
511 } else {
512 s2_p1_len = strlen(s2);
513 s2_p2 = 0;
514 }
515 strncpy(str1, s1, (s1_p1_len > sizeof(str1)) ? s1_p1_len : sizeof(str1)); *(str1 + s1_p1_len) = 0;
516 strncpy(str2, s2, (s2_p1_len > sizeof(str2)) ? s2_p1_len : sizeof(str2)); *(str2 + s2_p1_len) = 0;
517 retval = strcmp(str1, str2);
518 if (retval != 0) return retval; /* if they are not identical, then we can quit now and return the indication */
519 return strcmp(s1_p2, s2_p2); /* otherwise we return the result of comparing the 2nd half of the string */
520 }
521
522 static void sort_if_table(void) {
523 pcap_if_t *p1, *p2, *prev, *temp;
524 int has_swapped;
525
526 if (!acn_if_list) return; /* nothing to do if the list is empty */
527
528 while (1) {
529 p1 = acn_if_list; /* start at the head of the list */
530 prev = 0;
531 has_swapped = 0;
532 while ((p2 = p1->next)) {
533 if (if_sort(p1->name, p2->name) > 0) {
534 if (prev) { /* we are swapping things that are _not_ at the head of the list */
535 temp = p2->next;
536 prev->next = p2;
537 p2->next = p1;
538 p1->next = temp;
539 } else { /* special treatment if we are swapping with the head of the list */
540 temp = p2->next;
541 acn_if_list= p2;
542 p2->next = p1;
543 p1->next = temp;
544 }
545 p1 = p2;
546 prev = p1;
547 has_swapped = 1;
548 }
549 prev = p1;
550 p1 = p1->next;
551 }
552 if (has_swapped == 0)
553 return;
554 }
555 return;
556 }
557
558 static int process_client_data (char *errbuf) { /* returns: -1 = error, 0 = OK */
559 int chassis, geoslot;
560 unit_t *u;
561 pcap_if_t *iff, *prev_iff;
562 pcap_addr_t *addr, *prev_addr;
563 char *ptr;
564 int address_count;
565 struct sockaddr_in *s;
566 char *newname;
567 bpf_u_int32 interfaceType;
568 unsigned char flags;
569 void *bigger_buffer;
570
571 prev_iff = 0;
572 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
573 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { /* now loop over all the devices */
574 u = &units[chassis][geoslot];
575 empty_unit_iface(u);
576 ptr = u->imsg; /* point to the start of the msg for this IOP */
577 while (ptr < (u->imsg + u->len)) {
578 if ((iff = malloc(sizeof(pcap_if_t))) == NULL) {
579 pcap_fmt_errmsg_for_errno(errbuf,
580 PCAP_ERRBUF_SIZE, errno, "malloc");
581 return -1;
582 }
583 memset((char *)iff, 0, sizeof(pcap_if_t)); /* bzero() is deprecated, replaced with memset() */
584 if (acn_if_list == 0) acn_if_list = iff; /* remember the head of the list */
585 if (prev_iff) prev_iff->next = iff; /* insert a forward link */
586
587 if (*ptr) { /* if there is a count for the name */
588 if ((iff->name = malloc(*ptr + 1)) == NULL) { /* get that amount of space */
589 pcap_fmt_errmsg_for_errno(errbuf,
590 PCAP_ERRBUF_SIZE, errno,
591 "malloc");
592 return -1;
593 }
594 memcpy(iff->name, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */
595 *(iff->name + *ptr) = 0; /* and null terminate the string */
596 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */
597 }
598 ptr++;
599
600 if (*ptr) { /* if there is a count for the description */
601 if ((iff->description = malloc(*ptr + 1)) == NULL) { /* get that amount of space */
602 pcap_fmt_errmsg_for_errno(errbuf,
603 PCAP_ERRBUF_SIZE, errno,
604 "malloc");
605 return -1;
606 }
607 memcpy(iff->description, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */
608 *(iff->description + *ptr) = 0; /* and null terminate the string */
609 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */
610 }
611 ptr++;
612
613 interfaceType = ntohl(*(bpf_u_int32 *)ptr);
614 ptr += 4; /* skip over the interface type */
615
616 flags = *ptr++;
617 if (flags) iff->flags = PCAP_IF_LOOPBACK; /* if this is a loopback style interface, lets mark it as such */
618
619 address_count = *ptr++;
620
621 prev_addr = 0;
622 while (address_count--) {
623 if ((addr = malloc(sizeof(pcap_addr_t))) == NULL) {
624 pcap_fmt_errmsg_for_errno(errbuf,
625 PCAP_ERRBUF_SIZE, errno,
626 "malloc");
627 return -1;
628 }
629 memset((char *)addr, 0, sizeof(pcap_addr_t)); /* bzero() is deprecated, replaced with memset() */
630 if (iff->addresses == 0) iff->addresses = addr;
631 if (prev_addr) prev_addr->next = addr; /* insert a forward link */
632 if (*ptr) { /* if there is a count for the address */
633 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { /* get that amount of space */
634 pcap_fmt_errmsg_for_errno(errbuf,
635 PCAP_ERRBUF_SIZE,
636 errno, "malloc");
637 return -1;
638 }
639 memset((char *)s, 0, sizeof(struct sockaddr_in)); /* bzero() is deprecated, replaced with memset() */
640 addr->addr = (struct sockaddr *)s;
641 s->sin_family = AF_INET;
642 s->sin_addr.s_addr = *(bpf_u_int32 *)(ptr + 1); /* copy the address in */
643 ptr += *ptr; /* now move the pointer forwards according to the specified length of the address */
644 }
645 ptr++; /* then forwards one more for the 'length of the address' field */
646 if (*ptr) { /* process any netmask */
647 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
648 pcap_fmt_errmsg_for_errno(errbuf,
649 PCAP_ERRBUF_SIZE,
650 errno, "malloc");
651 return -1;
652 }
653 /* bzero() is deprecated, replaced with memset() */
654 memset((char *)s, 0, sizeof(struct sockaddr_in));
655
656 addr->netmask = (struct sockaddr *)s;
657 s->sin_family = AF_INET;
658 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
659 ptr += *ptr;
660 }
661 ptr++;
662 if (*ptr) { /* process any broadcast address */
663 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
664 pcap_fmt_errmsg_for_errno(errbuf,
665 PCAP_ERRBUF_SIZE,
666 errno, "malloc");
667 return -1;
668 }
669 /* bzero() is deprecated, replaced with memset() */
670 memset((char *)s, 0, sizeof(struct sockaddr_in));
671
672 addr->broadaddr = (struct sockaddr *)s;
673 s->sin_family = AF_INET;
674 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
675 ptr += *ptr;
676 }
677 ptr++;
678 if (*ptr) { /* process any destination address */
679 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
680 pcap_fmt_errmsg_for_errno(errbuf,
681 PCAP_ERRBUF_SIZE,
682 errno, "malloc");
683 return -1;
684 }
685 /* bzero() is deprecated, replaced with memset() */
686 memset((char *)s, 0, sizeof(struct sockaddr_in));
687
688 addr->dstaddr = (struct sockaddr *)s;
689 s->sin_family = AF_INET;
690 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
691 ptr += *ptr;
692 }
693 ptr++;
694 prev_addr = addr;
695 }
696 prev_iff = iff;
697
698 newname = translate_IOP_to_pcap_name(u, iff->name, interfaceType); /* add a translation entry and get a point to the mangled name */
699 bigger_buffer = realloc(iff->name, strlen(newname) + 1);
700 if (bigger_buffer == NULL) { /* we now re-write the name stored in the interface list */
701 pcap_fmt_errmsg_for_errno(errbuf,
702 PCAP_ERRBUF_SIZE, errno, "realloc");
703 return -1;
704 }
705 iff->name = bigger_buffer;
706 strcpy(iff->name, newname); /* to this new name */
707 }
708 }
709 }
710 return 0;
711 }
712
713 static int read_client_data (int fd) {
714 unsigned char buf[256];
715 int chassis, geoslot;
716 unit_t *u;
717 int len;
718
719 find_unit_by_fd(fd, &chassis, &geoslot, &u);
720
721 if ((len = recv(fd, buf, sizeof(buf), 0)) <= 0) return 0; /* read in whatever data was sent to us */
722
723 if ((u->imsg = realloc(u->imsg, (u->len + len))) == NULL) /* extend the buffer for the new data */
724 return 0;
725 memcpy((u->imsg + u->len), buf, len); /* append the new data */
726 u->len += len;
727 return 1;
728 }
729
730 static void wait_for_all_answers(void) {
731 int retval;
732 struct timeval tv;
733 int fd;
734 int chassis, geoslot;
735
736 tv.tv_sec = 2;
737 tv.tv_usec = 0;
738
739 while (1) {
740 int flag = 0;
741 fd_set working_set;
742
743 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of descriptors we may be listening to */
744 if (FD_ISSET(fd, &readfds)) flag = 1; /* and see if there are any still set */
745 }
746 if (flag == 0) return; /* we are done, when they are all gone */
747
748 memcpy(&working_set, &readfds, sizeof(readfds)); /* otherwise, we still have to listen for more stuff, till we timeout */
749 retval = select(max_fs + 1, &working_set, NULL, NULL, &tv);
750 if (retval == -1) { /* an error occured !!!!! */
751 return;
752 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */
753 printf("timeout\n");
754 return;
755 } else {
756 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of things to do, and do them */
757 if (FD_ISSET(fd, &working_set)) {
758 if (read_client_data(fd) == 0) { /* if the socket has closed */
759 FD_CLR(fd, &readfds); /* and descriptors we listen to for errors */
760 find_unit_by_fd(fd, &chassis, &geoslot, NULL);
761 close_with_IOP(chassis, geoslot, FIND); /* and close out connection to him */
762 }
763 }
764 }
765 }
766 }
767 }
768
769 static char *get_error_response(int fd, char *errbuf) { /* return a pointer on error, NULL on no error */
770 char byte;
771 int len = 0;
772
773 while (1) {
774 recv(fd, &byte, 1, 0); /* read another byte in */
775 if (errbuf && (len++ < PCAP_ERRBUF_SIZE)) { /* and if there is still room in the buffer */
776 *errbuf++ = byte; /* stick it in */
777 *errbuf = '\0'; /* ensure the string is null terminated just in case we might exceed the buffer's size */
778 }
779 if (byte == '\0') {
780 if (len > 1) { return errbuf; }
781 else { return NULL; }
782 }
783 }
784 }
785
786 int acn_findalldevs(char *errbuf) { /* returns: -1 = error, 0 = OK */
787 int chassis, geoslot;
788 unit_t *u;
789
790 FD_ZERO(&readfds);
791 max_fs = 0;
792 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
793 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
794 u = &units[chassis][geoslot];
795 if (u->ip && (open_with_IOP(u, FIND))) { /* connect to the remote IOP */
796 send_to_fd(u->find_fd, 1, (unsigned char *)"\0");
797 if (get_error_response(u->find_fd, errbuf))
798 close_with_IOP(chassis, geoslot, FIND);
799 else {
800 if (u->find_fd > max_fs)
801 max_fs = u->find_fd; /* remember the highest number currently in use */
802 FD_SET(u->find_fd, &readfds); /* we are going to want to read this guy's response to */
803 u->len = 0;
804 send_to_fd(u->find_fd, 1, (unsigned char *)"Q"); /* this interface query request */
805 }
806 }
807 }
808 }
809 wait_for_all_answers();
810 if (process_client_data(errbuf))
811 return -1;
812 sort_if_table();
813 return 0;
814 }
815
816 static int pcap_stats_acn(pcap_t *handle, struct pcap_stat *ps) {
817 unsigned char buf[12];
818
819 send_to_fd(handle->fd, 1, (unsigned char *)"S"); /* send the get_stats command to the IOP */
820
821 if (read_client_nbytes(handle->fd, sizeof(buf), buf) == -1) return -1; /* try reading the required bytes */
822
823 ps->ps_recv = ntohl(*(uint32_t *)&buf[0]); /* break the buffer into its three 32 bit components */
824 ps->ps_drop = ntohl(*(uint32_t *)&buf[4]);
825 ps->ps_ifdrop = ntohl(*(uint32_t *)&buf[8]);
826
827 return 0;
828 }
829
830 static int acn_open_live(const char *name, char *errbuf, int *linktype) { /* returns 0 on error, else returns the file descriptor */
831 int chassis, geoslot;
832 unit_t *u;
833 iface_t *p;
834 pcap_if_list_t devlist;
835
836 pcap_platform_finddevs(&devlist, errbuf);
837 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */
838 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
839 u = &units[chassis][geoslot];
840 if (u->ip != NULL) {
841 p = u->iface;
842 while (p) { /* and all interfaces... */
843 if (p->IOPname && p->name && (strcmp(p->name, name) == 0)) { /* and if we found the interface we want... */
844 *linktype = p->iftype;
845 open_with_IOP(u, LIVE); /* start a connection with that IOP */
846 send_to_fd(u->fd, strlen(p->IOPname)+1, (unsigned char *)p->IOPname); /* send the IOP's interface name, and a terminating null */
847 if (get_error_response(u->fd, errbuf)) {
848 return -1;
849 }
850 return u->fd; /* and return that open descriptor */
851 }
852 p = p->next;
853 }
854 }
855 }
856 }
857 return -1; /* if the interface wasn't found, return an error */
858 }
859
860 static void acn_start_monitor(int fd, int snaplen, int timeout, int promiscuous, int direction) {
861 unsigned char buf[8];
862 unit_t *u;
863
864 //printf("acn_start_monitor()\n"); // fulko
865 find_unit_by_fd(fd, NULL, NULL, &u);
866 if (u->first_time == 0) {
867 buf[0] = 'M';
868 *(uint32_t *)&buf[1] = htonl(snaplen);
869 buf[5] = timeout;
870 buf[6] = promiscuous;
871 buf[7] = direction;
872 //printf("acn_start_monitor() first time\n"); // fulko
873 send_to_fd(fd, 8, buf); /* send the start monitor command with its parameters to the IOP */
874 u->first_time = 1;
875 }
876 //printf("acn_start_monitor() complete\n"); // fulko
877 }
878
879 static int pcap_inject_acn(pcap_t *p, const void *buf _U_, int size _U_) {
880 pcap_strlcpy(p->errbuf, "Sending packets isn't supported on ACN adapters",
881 PCAP_ERRBUF_SIZE);
882 return (-1);
883 }
884
885 static int pcap_setfilter_acn(pcap_t *handle, struct bpf_program *bpf) {
886 int fd = handle->fd;
887 int count;
888 struct bpf_insn *p;
889 uint16_t shortInt;
890 uint32_t longInt;
891
892 send_to_fd(fd, 1, (unsigned char *)"F"); /* BPF filter follows command */
893 count = bpf->bf_len;
894 longInt = htonl(count);
895 send_to_fd(fd, 4, (unsigned char *)&longInt); /* send the instruction sequence count */
896 p = bpf->bf_insns;
897 while (count--) { /* followed by the list of instructions */
898 shortInt = htons(p->code);
899 longInt = htonl(p->k);
900 send_to_fd(fd, 2, (unsigned char *)&shortInt);
901 send_to_fd(fd, 1, (unsigned char *)&p->jt);
902 send_to_fd(fd, 1, (unsigned char *)&p->jf);
903 send_to_fd(fd, 4, (unsigned char *)&longInt);
904 p++;
905 }
906 if (get_error_response(fd, NULL))
907 return -1;
908 return 0;
909 }
910
911 static int acn_read_n_bytes_with_timeout(pcap_t *handle, int count) {
912 struct timeval tv;
913 int retval, fd;
914 fd_set r_fds;
915 fd_set w_fds;
916 u_char *bp;
917 int len = 0;
918 int offset = 0;
919
920 tv.tv_sec = 5;
921 tv.tv_usec = 0;
922
923 fd = handle->fd;
924 FD_ZERO(&r_fds);
925 FD_SET(fd, &r_fds);
926 memcpy(&w_fds, &r_fds, sizeof(r_fds));
927 bp = handle->bp;
928 while (count) {
929 retval = select(fd + 1, &w_fds, NULL, NULL, &tv);
930 if (retval == -1) { /* an error occured !!!!! */
931 // fprintf(stderr, "error during packet data read\n");
932 return -1; /* but we need to return a good indication to prevent unnecessary popups */
933 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */
934 // fprintf(stderr, "timeout during packet data read\n");
935 return -1;
936 } else {
937 if ((len = recv(fd, (bp + offset), count, 0)) <= 0) {
938 // fprintf(stderr, "premature exit during packet data rx\n");
939 return -1;
940 }
941 count -= len;
942 offset += len;
943 }
944 }
945 return 0;
946 }
947
948 static int pcap_read_acn(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) {
949 #define HEADER_SIZE (4 * 4)
950 unsigned char packet_header[HEADER_SIZE];
951 struct pcap_pkthdr pcap_header;
952
953 //printf("pcap_read_acn()\n"); // fulko
954 acn_start_monitor(handle->fd, handle->snapshot, handle->opt.timeout, handle->opt.promisc, handle->direction); /* maybe tell him to start monitoring */
955 //printf("pcap_read_acn() after start monitor\n"); // fulko
956
957 handle->bp = packet_header;
958 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 */
959
960 pcap_header.ts.tv_sec = ntohl(*(uint32_t *)&packet_header[0]); /* tv_sec */
961 pcap_header.ts.tv_usec = ntohl(*(uint32_t *)&packet_header[4]); /* tv_usec */
962 pcap_header.caplen = ntohl(*(uint32_t *)&packet_header[8]); /* caplen */
963 pcap_header.len = ntohl(*(uint32_t *)&packet_header[12]); /* len */
964
965 handle->bp = (u_char *)handle->buffer + handle->offset; /* start off the receive pointer at the right spot */
966 if (acn_read_n_bytes_with_timeout(handle, pcap_header.caplen) == -1) return 0; /* then try to read in the rest of the data */
967
968 callback(user, &pcap_header, handle->bp); /* call the user supplied callback function */
969 return 1;
970 }
971
972 static int pcap_activate_sita(pcap_t *handle) {
973 int fd;
974
975 if (handle->opt.rfmon) {
976 /*
977 * No monitor mode on SITA devices (they're not Wi-Fi
978 * devices).
979 */
980 return PCAP_ERROR_RFMON_NOTSUP;
981 }
982
983 /* Initialize some components of the pcap structure. */
984
985 handle->inject_op = pcap_inject_acn;
986 handle->setfilter_op = pcap_setfilter_acn;
987 handle->setdirection_op = NULL; /* Not implemented */
988 handle->set_datalink_op = NULL; /* can't change data link type */
989 handle->getnonblock_op = pcap_getnonblock_fd;
990 handle->setnonblock_op = pcap_setnonblock_fd;
991 handle->cleanup_op = pcap_cleanup_acn;
992 handle->read_op = pcap_read_acn;
993 handle->stats_op = pcap_stats_acn;
994
995 fd = acn_open_live(handle->opt.device, handle->errbuf,
996 &handle->linktype);
997 if (fd == -1)
998 return PCAP_ERROR;
999
1000 /*
1001 * Turn a negative snapshot value (invalid), a snapshot value of
1002 * 0 (unspecified), or a value bigger than the normal maximum
1003 * value, into the maximum allowed value.
1004 *
1005 * If some application really *needs* a bigger snapshot
1006 * length, we should just increase MAXIMUM_SNAPLEN.
1007 */
1008 if (handle->snapshot <= 0 || handle->snapshot > MAXIMUM_SNAPLEN)
1009 handle->snapshot = MAXIMUM_SNAPLEN;
1010
1011 handle->fd = fd;
1012 handle->bufsize = handle->snapshot;
1013
1014 /* Allocate the buffer */
1015
1016 handle->buffer = malloc(handle->bufsize + handle->offset);
1017 if (!handle->buffer) {
1018 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE,
1019 errno, "malloc");
1020 pcap_cleanup_acn(handle);
1021 return PCAP_ERROR;
1022 }
1023
1024 /*
1025 * "handle->fd" is a socket, so "select()" and "poll()"
1026 * should work on it.
1027 */
1028 handle->selectable_fd = handle->fd;
1029
1030 return 0;
1031 }
1032
1033 pcap_t *pcap_create_interface(const char *device _U_, char *ebuf) {
1034 pcap_t *p;
1035
1036 p = pcap_create_common(ebuf, 0);
1037 if (p == NULL)
1038 return (NULL);
1039
1040 p->activate_op = pcap_activate_sita;
1041 return (p);
1042 }
1043
1044 int pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf) {
1045
1046 //printf("pcap_findalldevs()\n"); // fulko
1047
1048 *alldevsp = 0; /* initialize the returned variables before we do anything */
1049 strcpy(errbuf, "");
1050 if (acn_parse_hosts_file(errbuf)) /* scan the hosts file for potential IOPs */
1051 {
1052 //printf("pcap_findalldevs() returning BAD after parsehosts\n"); // fulko
1053 return -1;
1054 }
1055 //printf("pcap_findalldevs() got hostlist now finding devs\n"); // fulko
1056 if (acn_findalldevs(errbuf)) /* then ask the IOPs for their monitorable devices */
1057 {
1058 //printf("pcap_findalldevs() returning BAD after findalldevs\n"); // fulko
1059 return -1;
1060 }
1061 devlistp->beginning = acn_if_list;
1062 acn_if_list = 0; /* then forget our list head, because someone will call pcap_freealldevs() to empty the malloc'ed stuff */
1063 //printf("pcap_findalldevs() returning ZERO OK\n"); // fulko
1064 return 0;
1065 }
1066
1067 /*
1068 * Libpcap version string.
1069 */
1070 const char *
1071 pcap_lib_version(void)
1072 {
1073 return PCAP_VERSION_STRING " (SITA-only)";
1074 }
[mirror] the LIBpcap interface to various kernel packet capture mechanism