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Turn close_op into cleanup_op; the routine that handles it can also be
[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 }
218 }
219
220 static void empty_unit_table(void) {
221 int chassis, geoslot;
222
223 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
224 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
225 if (units[chassis][geoslot].ip != NULL) {
226 free(units[chassis][geoslot].ip); /* get rid of the malloc'ed space that holds the IP address */
227 units[chassis][geoslot].ip = 0; /* then set the pointer to NULL */
228 }
229 empty_unit(chassis, geoslot);
230 }
231 }
232 }
233
234 static char *find_nth_interface_name(int n) {
235 int chassis, geoslot;
236 iface_t *p;
237 char *last_name = 0;
238
239 if (n < 0) n = 0; /* ensure we are working with a valid number */
240 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */
241 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
242 if (units[chassis][geoslot].ip != NULL) {
243 p = units[chassis][geoslot].iface;
244 while (p) { /* and all interfaces... */
245 if (p->IOPname) last_name = p->name; /* remembering the last name found */
246 if (n-- == 0) return last_name; /* and if we hit the instance requested */
247 p = p->next;
248 }
249 }
250 }
251 }
252 /* if we couldn't fine the selected entry */
253 if (last_name) return last_name; /* ... but we did have at least one entry... return the last entry found */
254 return ""; /* ... but if there wasn't any entry... return an empty string instead */
255 }
256
257 int acn_parse_hosts_file(char *errbuf) { /* returns: -1 = error, 0 = OK */
258 FILE *fp;
259 char buf[MAX_LINE_SIZE];
260 char *ptr, *ptr2;
261 int pos;
262 int chassis, geoslot;
263 unit_t *u;
264
265 empty_unit_table();
266 if ((fp = fopen("/etc/hosts", "r")) == NULL) { /* try to open the hosts file and if it fails */
267 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot open '/etc/hosts' for reading."); /* return the nohostsfile error response */
268 return -1;
269 }
270 while (fgets(buf, MAX_LINE_SIZE-1, fp)) { /* while looping over the file */
271
272 pos = strcspn(buf, "#\n\r"); /* find the first comment character or EOL */
273 *(buf + pos) = '\0'; /* and clobber it and anything that follows it */
274
275 pos = strspn(buf, " \t"); /* then find the first non-white space */
276 if (pos == strlen(buf)) /* if there is nothing but white space on the line */
277 continue; /* ignore that empty line */
278 ptr = buf + pos; /* and skip over any of that leading whitespace */
279
280 if ((ptr2 = strstr(ptr, "_I_")) == NULL) /* skip any lines that don't have names that look like they belong to IOPs */
281 continue;
282 if (*(ptr2 + 4) != '_') /* and skip other lines that have names that don't look like ACN components */
283 continue;
284 *(ptr + strcspn(ptr, " \t")) = '\0'; /* null terminate the IP address so its a standalone string */
285
286 chassis = *(ptr2 + 3) - '0'; /* extract the chassis number */
287 geoslot = *(ptr2 + 5) - '0'; /* and geo-slot number */
288 if (chassis < 1 || chassis > MAX_CHASSIS ||
289 geoslot < 1 || geoslot > MAX_GEOSLOT) { /* if the chassis and/or slot numbers appear to be bad... */
290 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Invalid ACN name in '/etc/hosts'."); /* warn the user */
291 continue; /* and ignore the entry */
292 }
293 if ((ptr2 = (char *)malloc(strlen(ptr) + 1)) == NULL) {
294 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
295 continue;
296 }
297 strcpy(ptr2, ptr); /* copy the IP address into our malloc'ed memory */
298 u = &units[chassis][geoslot];
299 u->ip = ptr2; /* and remember the whole shebang */
300 u->chassis = chassis;
301 u->geoslot = geoslot;
302 }
303 fclose(fp);
304 if (*errbuf) return -1;
305 else return 0;
306 }
307
308 static int open_with_IOP(unit_t *u, int flag) {
309 int sockfd;
310 char *ip;
311
312 if (u->serv_addr == NULL) {
313 u->serv_addr = malloc(sizeof(struct sockaddr_in));
314 }
315 ip = u->ip;
316 bzero((char *)u->serv_addr, sizeof(struct sockaddr_in));
317 u->serv_addr->sin_family = AF_INET;
318 u->serv_addr->sin_addr.s_addr = inet_addr(ip);
319 u->serv_addr->sin_port = htons(IOP_SNIFFER_PORT);
320
321 if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
322 fprintf(stderr, "pcap can't open a socket for connecting to IOP at %s\n", ip);
323 return 0;
324 }
325 if (connect(sockfd, (struct sockaddr *)u->serv_addr, sizeof(struct sockaddr_in)) < 0) {
326 fprintf(stderr, "pcap can't connect to IOP at %s\n", ip);
327 return 0;
328 }
329 if (flag == LIVE) u->fd = sockfd;
330 else u->find_fd = sockfd;
331 u->first_time = 0;
332 return sockfd; /* return the non-zero file descriptor as a 'success' indicator */
333 }
334
335 static void close_with_IOP(int chassis, int geoslot, int flag) {
336 int *id;
337
338 if (flag == LIVE) id = &units[chassis][geoslot].fd;
339 else id = &units[chassis][geoslot].find_fd;
340
341 if (*id) { /* this was the last time, so... if we are connected... */
342 close(*id); /* disconnect us */
343 *id = 0; /* and forget that the descriptor exists because we are not open */
344 }
345 }
346
347 static void pcap_cleanup_acn(pcap_t *handle) {
348 int chassis, geoslot;
349 unit_t *u;
350
351 if (find_unit_by_fd(handle->fd, &chassis, &geoslot, &u) == 0)
352 return;
353 close_with_IOP(chassis, geoslot, LIVE);
354 if (u)
355 u->first_time = 0;
356 pcap_cleanup_live_common(handle);
357 }
358
359 static void send_to_fd(int fd, int len, unsigned char *str) {
360 int nwritten;
361 int chassis, geoslot;
362
363 while (len > 0) {
364 if ((nwritten = write(fd, str, len)) <= 0) {
365 find_unit_by_fd(fd, &chassis, &geoslot, NULL);
366 if (units[chassis][geoslot].fd == fd) close_with_IOP(chassis, geoslot, LIVE);
367 else if (units[chassis][geoslot].find_fd == fd) close_with_IOP(chassis, geoslot, FIND);
368 empty_unit(chassis, geoslot);
369 return;
370 }
371 len -= nwritten;
372 str += nwritten;
373 }
374 }
375
376 static void acn_freealldevs(void) {
377
378 pcap_if_t *iff, *next_iff;
379 pcap_addr_t *addr, *next_addr;
380
381 for (iff = acn_if_list; iff != NULL; iff = next_iff) {
382 next_iff = iff->next;
383 for (addr = iff->addresses; addr != NULL; addr = next_addr) {
384 next_addr = addr->next;
385 if (addr->addr) free(addr->addr);
386 if (addr->netmask) free(addr->netmask);
387 if (addr->broadaddr) free(addr->broadaddr);
388 if (addr->dstaddr) free(addr->dstaddr);
389 free(addr);
390 }
391 if (iff->name) free(iff->name);
392 if (iff->description) free(iff->description);
393 free(iff);
394 }
395 }
396
397 static char *nonUnified_port_num(unit_t *u, int IOPportnum) {
398
399 sprintf(static_buf, "%d_%d", u->chassis, u->geoslot);
400 return static_buf;
401 }
402
403 static char *unified_port_num(unit_t *u, int IOPportnum) {
404 int portnum;
405
406 portnum = ((u->chassis - 1) * 64) + ((u->geoslot - 1) * 8) + IOPportnum + 1;
407 sprintf(static_buf, "%d", portnum);
408 return static_buf;
409 }
410
411 static char *translate_IOP_to_pcap_name(unit_t *u, char *IOPname, bpf_u_int32 iftype) {
412 iface_t *iface_ptr, *iface;
413 char *name;
414 char buf[32];
415 char *proto;
416 char *port;
417 int IOPportnum = 0;
418
419 iface = malloc(sizeof(iface_t)); /* get memory for a structure */
420 bzero((char *)iface, sizeof(iface_t));
421
422 iface->iftype = iftype; /* remember the interface type of this interface */
423
424 name = malloc(strlen(IOPname) + 1); /* get memory for the IOP's name */
425 strcpy(name, IOPname); /* and copy it in */
426 iface->IOPname = name; /* and stick it into the structure */
427
428 if (strncmp(IOPname, "lo", 2) == 0) {
429 IOPportnum = atoi(&IOPname[2]);
430 switch (iftype) {
431 case DLT_EN10MB: proto = "lo"; port = nonUnified_port_num(u, IOPportnum); break;
432 default: proto = "???"; port = unified_port_num(u, IOPportnum); break;
433 }
434 } else if (strncmp(IOPname, "eth", 3) == 0) {
435 IOPportnum = atoi(&IOPname[3]);
436 switch (iftype) {
437 case DLT_EN10MB: proto = "eth"; port = nonUnified_port_num(u, IOPportnum); break;
438 default: proto = "???"; port = unified_port_num(u, IOPportnum); break;
439 }
440 } else if (strncmp(IOPname, "wan", 3) == 0) {
441 IOPportnum = atoi(&IOPname[3]);
442 switch (iftype) {
443 case DLT_SITA: proto = "wan"; port = unified_port_num(u, IOPportnum); break;
444 default: proto = "???"; port = unified_port_num(u, IOPportnum); break;
445 }
446 }
447
448 sprintf(buf, "%s_%s", proto, port); /* compose the user's name for that IOP port name */
449 name = malloc(strlen(buf) + 1); /* get memory for that name */
450 strcpy(name, buf); /* and copy it in */
451 iface->name = name; /* and stick it into the structure */
452
453 if (u->iface == 0) { /* if this is the first name */
454 u->iface = iface; /* stick this entry at the head of the list */
455 } else {
456 iface_ptr = u->iface;
457 while (iface_ptr->next) { /* othewise scan the list */
458 iface_ptr = iface_ptr->next; /* till we're at the last entry */
459 }
460 iface_ptr->next = iface; /* then tack this entry on the end of the list */
461 }
462 return iface->name;
463 }
464
465 static int if_sort(char *s1, char *s2) {
466 char *s1_p2, *s2_p2;
467 char str1[MAX_LINE_SIZE], str2[MAX_LINE_SIZE];
468 int s1_p1_len, s2_p1_len;
469 int retval;
470
471 if ((s1_p2 = strchr(s1, '_'))) { /* if an underscore is found... */
472 s1_p1_len = s1_p2 - s1; /* the prefix length is the difference in pointers */
473 s1_p2++; /* the suffix actually starts _after_ the underscore */
474 } else { /* otherwise... */
475 s1_p1_len = strlen(s1); /* the prefix length is the length of the string itself */
476 s1_p2 = 0; /* and there is no suffix */
477 }
478 if ((s2_p2 = strchr(s2, '_'))) { /* now do the same for the second string */
479 s2_p1_len = s2_p2 - s2;
480 s2_p2++;
481 } else {
482 s2_p1_len = strlen(s2);
483 s2_p2 = 0;
484 }
485 strncpy(str1, s1, (s1_p1_len > sizeof(str1)) ? s1_p1_len : sizeof(str1)); *(str1 + s1_p1_len) = 0;
486 strncpy(str2, s2, (s2_p1_len > sizeof(str2)) ? s2_p1_len : sizeof(str2)); *(str2 + s2_p1_len) = 0;
487 retval = strcmp(str1, str2);
488 if (retval != 0) return retval; /* if they are not identical, then we can quit now and return the indication */
489 return strcmp(s1_p2, s2_p2); /* otherwise we return the result of comparing the 2nd half of the string */
490 }
491
492 static void sort_if_table(void) {
493 pcap_if_t *p1, *p2, *prev, *temp;
494 int has_swapped;
495
496 if (!acn_if_list) return; /* nothing to do if the list is empty */
497
498 while (1) {
499 p1 = acn_if_list; /* start at the head of the list */
500 prev = 0;
501 has_swapped = 0;
502 while ((p2 = p1->next)) {
503 if (if_sort(p1->name, p2->name) > 0) {
504 if (prev) { /* we are swapping things that are _not_ at the head of the list */
505 temp = p2->next;
506 prev->next = p2;
507 p2->next = p1;
508 p1->next = temp;
509 } else { /* special treatment if we are swapping with the head of the list */
510 temp = p2->next;
511 acn_if_list= p2;
512 p2->next = p1;
513 p1->next = temp;
514 }
515 p1 = p2;
516 prev = p1;
517 has_swapped = 1;
518 }
519 prev = p1;
520 p1 = p1->next;
521 }
522 if (has_swapped == 0)
523 return;
524 }
525 return;
526 }
527
528 static int process_client_data (char *errbuf) { /* returns: -1 = error, 0 = OK */
529 int chassis, geoslot;
530 unit_t *u;
531 pcap_if_t *iff, *prev_iff;
532 pcap_addr_t *addr, *prev_addr;
533 char *ptr;
534 int address_count;
535 struct sockaddr_in *s;
536 char *newname;
537 bpf_u_int32 interfaceType;
538 unsigned char flags;
539
540 prev_iff = 0;
541 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
542 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { /* now loop over all the devices */
543 u = &units[chassis][geoslot];
544 empty_unit_iface(u);
545 ptr = u->imsg; /* point to the start of the msg for this IOP */
546 while (ptr < (u->imsg + u->len)) {
547 if ((iff = malloc(sizeof(pcap_if_t))) == NULL) {
548 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
549 return -1;
550 }
551 bzero((char *)iff, sizeof(pcap_if_t));
552 if (acn_if_list == 0) acn_if_list = iff; /* remember the head of the list */
553 if (prev_iff) prev_iff->next = iff; /* insert a forward link */
554
555 if (*ptr) { /* if there is a count for the name */
556 if ((iff->name = malloc(*ptr + 1)) == NULL) { /* get that amount of space */
557 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
558 return -1;
559 }
560 memcpy(iff->name, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */
561 *(iff->name + *ptr) = 0; /* and null terminate the string */
562 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */
563 }
564 ptr++;
565
566 if (*ptr) { /* if there is a count for the description */
567 if ((iff->description = malloc(*ptr + 1)) == NULL) { /* get that amount of space */
568 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
569 return -1;
570 }
571 memcpy(iff->description, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */
572 *(iff->description + *ptr) = 0; /* and null terminate the string */
573 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */
574 }
575 ptr++;
576
577 interfaceType = ntohl(*(bpf_u_int32 *)ptr);
578 ptr += 4; /* skip over the interface type */
579
580 flags = *ptr++;
581 if (flags) iff->flags = PCAP_IF_LOOPBACK; /* if this is a loopback style interface, lets mark it as such */
582
583 address_count = *ptr++;
584
585 prev_addr = 0;
586 while (address_count--) {
587 if ((addr = malloc(sizeof(pcap_addr_t))) == NULL) {
588 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
589 return -1;
590 }
591 bzero((char *)addr, sizeof(pcap_addr_t));
592 if (iff->addresses == 0) iff->addresses = addr;
593 if (prev_addr) prev_addr->next = addr; /* insert a forward link */
594 if (*ptr) { /* if there is a count for the address */
595 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { /* get that amount of space */
596 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
597 return -1;
598 }
599 bzero((char *)s, sizeof(struct sockaddr_in));
600 addr->addr = (struct sockaddr *)s;
601 s->sin_family = AF_INET;
602 s->sin_addr.s_addr = *(bpf_u_int32 *)(ptr + 1); /* copy the address in */
603 ptr += *ptr; /* now move the pointer forwards according to the specified length of the address */
604 }
605 ptr++; /* then forwards one more for the 'length of the address' field */
606 if (*ptr) { /* process any netmask */
607 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
608 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
609 return -1;
610 }
611 bzero((char *)s, sizeof(struct sockaddr_in));
612 addr->netmask = (struct sockaddr *)s;
613 s->sin_family = AF_INET;
614 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
615 ptr += *ptr;
616 }
617 ptr++;
618 if (*ptr) { /* process any broadcast address */
619 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
620 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
621 return -1;
622 }
623 bzero((char *)s, sizeof(struct sockaddr_in));
624 addr->broadaddr = (struct sockaddr *)s;
625 s->sin_family = AF_INET;
626 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
627 ptr += *ptr;
628 }
629 ptr++;
630 if (*ptr) { /* process any destination address */
631 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
632 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
633 return -1;
634 }
635 bzero((char *)s, sizeof(struct sockaddr_in));
636 addr->dstaddr = (struct sockaddr *)s;
637 s->sin_family = AF_INET;
638 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
639 ptr += *ptr;
640 }
641 ptr++;
642 prev_addr = addr;
643 }
644 prev_iff = iff;
645
646 newname = translate_IOP_to_pcap_name(u, iff->name, interfaceType); /* add a translation entry and get a point to the mangled name */
647 if ((iff->name = realloc(iff->name, strlen(newname) + 1)) == NULL) { /* we now re-write the name stored in the interface list */
648 snprintf(errbuf, PCAP_ERRBUF_SIZE, "realloc: %s", pcap_strerror(errno));
649 return -1;
650 }
651 strcpy(iff->name, newname); /* to this new name */
652 }
653 }
654 }
655 return 0;
656 }
657
658 static int read_client_data (int fd) {
659 unsigned char buf[256];
660 int chassis, geoslot;
661 unit_t *u;
662 int len;
663
664 find_unit_by_fd(fd, &chassis, &geoslot, &u);
665
666 if ((len = recv(fd, buf, sizeof(buf), 0)) <= 0) return 0; /* read in whatever data was sent to us */
667
668 if ((u->imsg = realloc(u->imsg, (u->len + len))) == NULL) /* extend the buffer for the new data */
669 return 0;
670 memcpy((u->imsg + u->len), buf, len); /* append the new data */
671 u->len += len;
672 return 1;
673 }
674
675 static void wait_for_all_answers(void) {
676 int retval;
677 struct timeval tv;
678 int fd;
679 int chassis, geoslot;
680
681 tv.tv_sec = 2;
682 tv.tv_usec = 0;
683
684 while (1) {
685 int flag = 0;
686 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of descriptors we may be listening to */
687 if (FD_ISSET(fd, &readfds)) flag = 1; /* and see if there are any still set */
688 }
689 if (flag == 0) return; /* we are done, when they are all gone */
690
691 memcpy(&working_set, &readfds, sizeof(readfds)); /* otherwise, we still have to listen for more stuff, till we timeout */
692 retval = select(max_fs + 1, &working_set, NULL, NULL, &tv);
693 if (retval == -1) { /* an error occured !!!!! */
694 return;
695 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */
696 printf("timeout\n");
697 return;
698 } else {
699 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of things to do, and do them */
700 if (FD_ISSET(fd, &working_set)) {
701 if (read_client_data(fd) == 0) { /* if the socket has closed */
702 FD_CLR(fd, &readfds); /* and descriptors we listen to for errors */
703 find_unit_by_fd(fd, &chassis, &geoslot, NULL);
704 close_with_IOP(chassis, geoslot, FIND); /* and close out connection to him */
705 }
706 }
707 }
708 }
709 }
710 }
711
712 static char *get_error_response(int fd, char *errbuf) { /* return a pointer on error, NULL on no error */
713 char byte;
714 int len = 0;
715
716 while (1) {
717 recv(fd, &byte, 1, 0); /* read another byte in */
718 if (errbuf && (len++ < PCAP_ERRBUF_SIZE)) { /* and if there is still room in the buffer */
719 *errbuf++ = byte; /* stick it in */
720 *errbuf = '\0'; /* ensure the string is null terminated just in case we might exceed the buffer's size */
721 }
722 if (byte == '\0') {
723 if (len > 1) { return errbuf; }
724 else { return NULL; }
725 }
726 }
727 }
728
729 int acn_findalldevs(char *errbuf) { /* returns: -1 = error, 0 = OK */
730 int chassis, geoslot;
731 unit_t *u;
732
733 FD_ZERO(&readfds);
734 max_fs = 0;
735 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
736 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
737 u = &units[chassis][geoslot];
738 if (u->ip && (open_with_IOP(u, FIND))) { /* connect to the remote IOP */
739 send_to_fd(u->find_fd, 1, (unsigned char *)"\0");
740 if (get_error_response(u->find_fd, errbuf))
741 close_with_IOP(chassis, geoslot, FIND);
742 else {
743 if (u->find_fd > max_fs)
744 max_fs = u->find_fd; /* remember the highest number currently in use */
745 FD_SET(u->find_fd, &readfds); /* we are going to want to read this guy's response to */
746 u->len = 0;
747 send_to_fd(u->find_fd, 1, (unsigned char *)"Q"); /* this interface query request */
748 }
749 }
750 }
751 }
752 wait_for_all_answers();
753 if (process_client_data(errbuf))
754 return -1;
755 sort_if_table();
756 return 0;
757 }
758
759 static int pcap_stats_acn(pcap_t *handle, struct pcap_stat *ps) {
760 unsigned char buf[12];
761
762 send_to_fd(handle->fd, 1, (unsigned char *)"S"); /* send the get_stats command to the IOP */
763
764 if (read_client_nbytes(handle->fd, sizeof(buf), buf) == -1) return -1; /* try reading the required bytes */
765
766 ps->ps_recv = ntohl(*(uint32_t *)&buf[0]); /* break the buffer into its three 32 bit components */
767 ps->ps_drop = ntohl(*(uint32_t *)&buf[4]);
768 ps->ps_ifdrop = ntohl(*(uint32_t *)&buf[8]);
769
770 return 0;
771 }
772
773 static int acn_open_live(const char *name, char *errbuf, int *linktype) { /* returns 0 on error, else returns the file descriptor */
774 int chassis, geoslot;
775 unit_t *u;
776 iface_t *p;
777 pcap_if_t *alldevsp;
778
779 pcap_findalldevs(&alldevsp, errbuf);
780 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */
781 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
782 u = &units[chassis][geoslot];
783 if (u->ip != NULL) {
784 p = u->iface;
785 while (p) { /* and all interfaces... */
786 if (p->IOPname && p->name && (strcmp(p->name, name) == 0)) { /* and if we found the interface we want... */
787 *linktype = p->iftype;
788 open_with_IOP(u, LIVE); /* start a connection with that IOP */
789 send_to_fd(u->fd, strlen(p->IOPname)+1, (unsigned char *)p->IOPname); /* send the IOP's interface name, and a terminating null */
790 if (get_error_response(u->fd, errbuf)) {
791 return -1;
792 }
793 return u->fd; /* and return that open descriptor */
794 }
795 p = p->next;
796 }
797 }
798 }
799 }
800 return -1; /* if the interface wasn't found, return an error */
801 }
802
803 static void acn_start_monitor(int fd, int snaplen, int timeout, int promiscuous, int direction) {
804 unsigned char buf[8];
805 unit_t *u;
806
807 //printf("acn_start_monitor()\n"); // fulko
808 find_unit_by_fd(fd, NULL, NULL, &u);
809 if (u->first_time == 0) {
810 buf[0] = 'M';
811 *(uint32_t *)&buf[1] = htonl(snaplen);
812 buf[5] = timeout;
813 buf[6] = promiscuous;
814 buf[7] = direction;
815 //printf("acn_start_monitor() first time\n"); // fulko
816 send_to_fd(fd, 8, buf); /* send the start monitor command with its parameters to the IOP */
817 u->first_time = 1;
818 }
819 //printf("acn_start_monitor() complete\n"); // fulko
820 }
821
822 static int pcap_inject_acn(pcap_t *p, const void *buf _U_, size_t size _U_) {
823 strlcpy(p->errbuf, "Sending packets isn't supported on ACN adapters",
824 PCAP_ERRBUF_SIZE);
825 return (-1);
826 }
827
828 static int pcap_setfilter_acn(pcap_t *handle, struct bpf_program *bpf) {
829 int fd = handle->fd;
830 int count;
831 struct bpf_insn *p;
832 uint16_t shortInt;
833 uint32_t longInt;
834
835 send_to_fd(fd, 1, (unsigned char *)"F"); /* BPF filter follows command */
836 count = bpf->bf_len;
837 longInt = htonl(count);
838 send_to_fd(fd, 4, (unsigned char *)&longInt); /* send the instruction sequence count */
839 p = bpf->bf_insns;
840 while (count--) { /* followed by the list of instructions */
841 shortInt = htons(p->code);
842 longInt = htonl(p->k);
843 send_to_fd(fd, 2, (unsigned char *)&shortInt);
844 send_to_fd(fd, 1, (unsigned char *)&p->jt);
845 send_to_fd(fd, 1, (unsigned char *)&p->jf);
846 send_to_fd(fd, 4, (unsigned char *)&longInt);
847 p++;
848 }
849 if (get_error_response(fd, NULL))
850 return -1;
851 return 0;
852 }
853
854 static int pcap_setdirection_acn(pcap_t *handle, pcap_direction_t d) {
855 snprintf(handle->errbuf, sizeof(handle->errbuf),
856 "Setting direction is not supported on ACN adapters");
857 return -1;
858 }
859
860 static int acn_read_n_bytes_with_timeout(pcap_t *handle, int count) {
861 struct timeval tv;
862 int retval, fd;
863 fd_set r_fds;
864 fd_set w_fds;
865 u_char *bp;
866 int len = 0;
867 int offset = 0;
868
869 tv.tv_sec = 5;
870 tv.tv_usec = 0;
871
872 fd = handle->fd;
873 FD_ZERO(&r_fds);
874 FD_SET(fd, &r_fds);
875 memcpy(&w_fds, &r_fds, sizeof(r_fds));
876 bp = handle->bp;
877 while (count) {
878 retval = select(fd + 1, &w_fds, NULL, NULL, &tv);
879 if (retval == -1) { /* an error occured !!!!! */
880 // fprintf(stderr, "error during packet data read\n");
881 return -1; /* but we need to return a good indication to prevent unneccessary popups */
882 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */
883 // fprintf(stderr, "timeout during packet data read\n");
884 return -1;
885 } else {
886 if ((len = recv(fd, (bp + offset), count, 0)) <= 0) {
887 // fprintf(stderr, "premature exit during packet data rx\n");
888 return -1;
889 }
890 count -= len;
891 offset += len;
892 }
893 }
894 return 0;
895 }
896
897 static int pcap_read_acn(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) {
898 #define HEADER_SIZE (4 * 4)
899 unsigned char packet_header[HEADER_SIZE];
900 struct pcap_pkthdr pcap_header;
901
902 //printf("pcap_read_acn()\n"); // fulko
903 acn_start_monitor(handle->fd, handle->snapshot, handle->md.timeout, handle->md.clear_promisc, handle->direction); /* maybe tell him to start monitoring */
904 //printf("pcap_read_acn() after start monitor\n"); // fulko
905
906 handle->bp = packet_header;
907 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 */
908
909 pcap_header.ts.tv_sec = ntohl(*(uint32_t *)&packet_header[0]); /* tv_sec */
910 pcap_header.ts.tv_usec = ntohl(*(uint32_t *)&packet_header[4]); /* tv_usec */
911 pcap_header.caplen = ntohl(*(uint32_t *)&packet_header[8]); /* caplen */
912 pcap_header.len = ntohl(*(uint32_t *)&packet_header[12]); /* len */
913
914 handle->bp = handle->buffer + handle->offset; /* start off the receive pointer at the right spot */
915 if (acn_read_n_bytes_with_timeout(handle, pcap_header.caplen) == -1) return 0; /* then try to read in the rest of the data */
916
917 callback(user, &pcap_header, handle->bp); /* call the user supplied callback function */
918 return 1;
919 }
920
921 static int pcap_activate_sita(pcap_t *handle) {
922 int fd;
923
924 if (handle->opt.rfmon) {
925 /*
926 * No monitor mode on SITA devices (they're not Wi-Fi
927 * devices).
928 */
929 return PCAP_ERROR_RFMON_NOTSUP;
930 }
931
932 /* Initialize some components of the pcap structure. */
933
934 handle->inject_op = pcap_inject_acn;
935 handle->setfilter_op = pcap_setfilter_acn;
936 handle->setdirection_op = pcap_setdirection_acn;
937 handle->set_datalink_op = NULL; /* can't change data link type */
938 handle->getnonblock_op = pcap_getnonblock_fd;
939 handle->setnonblock_op = pcap_setnonblock_fd;
940 handle->cleanup_op = pcap_cleanup_acn;
941 handle->read_op = pcap_read_acn;
942 handle->stats_op = pcap_stats_acn;
943
944 fd = acn_open_live(handle->opt.source, handle->errbuf,
945 &handle->linktype);
946 if (fd == -1)
947 return PCAP_ERROR;
948 handle->md.clear_promisc = handle->md.promisc;
949 handle->fd = fd;
950 handle->bufsize = handle->snapshot;
951
952 /* Allocate the buffer */
953
954 handle->buffer = malloc(handle->bufsize + handle->offset);
955 if (!handle->buffer) {
956 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
957 "malloc: %s", pcap_strerror(errno));
958 pcap_cleanup_acn(handle);
959 return PCAP_ERROR;
960 }
961
962 /*
963 * "handle->fd" is a socket, so "select()" and "poll()"
964 * should work on it.
965 */
966 handle->selectable_fd = handle->fd;
967
968 return 0;
969 }
970
971 pcap_t *pcap_create(const char *device, char *ebuf) {
972 pcap_t *p;
973
974 p = pcap_create_common(device, ebuf);
975 if (p == NULL)
976 return (NULL);
977
978 p->activate_op = pcap_activate_sita;
979 return (p);
980 }
[mirror] the LIBpcap interface to various kernel packet capture mechanism