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 */
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 unit_t units[MAX_CHASSIS+1][MAX_GEOSLOT+1]; /* we use indexes of 1 through 8, but we reserve/waste index 0 */
78 static fd_set readfds; /* a place to store the file descriptors for the connections to the IOPs */
79 static int max_fs;
80
81 pcap_if_t *acn_if_list; /* pcap's list of available interfaces */
82
dump_interface_list(void)83 static void dump_interface_list(void) {
84 pcap_if_t *iff;
85 pcap_addr_t *addr;
86 int longest_name_len = 0;
87 char *n, *d, *f;
88 int if_number = 0;
89
90 iff = acn_if_list;
91 while (iff) {
92 if (iff->name && (strlen(iff->name) > longest_name_len)) longest_name_len = strlen(iff->name);
93 iff = iff->next;
94 }
95 iff = acn_if_list;
96 printf("Interface List:\n");
97 while (iff) {
98 n = (iff->name) ? iff->name : "";
99 d = (iff->description) ? iff->description : "";
100 f = (iff->flags == PCAP_IF_LOOPBACK) ? "L" : "";
101 printf("%3d: %*s %s '%s'\n", if_number++, longest_name_len, n, f, d);
102 addr = iff->addresses;
103 while (addr) {
104 printf("%*s ", (5 + longest_name_len), ""); /* add some indentation */
105 printf("%15s ", (addr->addr) ? inet_ntoa(((struct sockaddr_in *)addr->addr)->sin_addr) : "");
106 printf("%15s ", (addr->netmask) ? inet_ntoa(((struct sockaddr_in *)addr->netmask)->sin_addr) : "");
107 printf("%15s ", (addr->broadaddr) ? inet_ntoa(((struct sockaddr_in *)addr->broadaddr)->sin_addr) : "");
108 printf("%15s ", (addr->dstaddr) ? inet_ntoa(((struct sockaddr_in *)addr->dstaddr)->sin_addr) : "");
109 printf("\n");
110 addr = addr->next;
111 }
112 iff = iff->next;
113 }
114 }
115
dump(unsigned char * ptr,int i,int indent)116 static void dump(unsigned char *ptr, int i, int indent) {
117 fprintf(stderr, "%*s", indent, " ");
118 for (; i > 0; i--) {
119 fprintf(stderr, "%2.2x ", *ptr++);
120 }
121 fprintf(stderr, "\n");
122 }
123
dump_interface_list_p(void)124 static void dump_interface_list_p(void) {
125 pcap_if_t *iff;
126 pcap_addr_t *addr;
127 int if_number = 0;
128
129 iff = acn_if_list;
130 printf("Interface Pointer @ %p is %p:\n", &acn_if_list, iff);
131 while (iff) {
132 printf("%3d: %p %p next: %p\n", if_number++, iff->name, iff->description, iff->next);
133 dump((unsigned char *)iff, sizeof(pcap_if_t), 5);
134 addr = iff->addresses;
135 while (addr) {
136 printf(" %p %p %p %p, next: %p\n", addr->addr, addr->netmask, addr->broadaddr, addr->dstaddr, addr->next);
137 dump((unsigned char *)addr, sizeof(pcap_addr_t), 10);
138 addr = addr->next;
139 }
140 iff = iff->next;
141 }
142 }
143
dump_unit_table(void)144 static void dump_unit_table(void) {
145 int chassis, geoslot;
146 iface_t *p;
147
148 printf("%c:%c %s %s\n", 'C', 'S', "fd", "IP Address");
149 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
150 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
151 if (units[chassis][geoslot].ip != NULL)
152 printf("%d:%d %2d %s\n", chassis, geoslot, units[chassis][geoslot].fd, units[chassis][geoslot].ip);
153 p = units[chassis][geoslot].iface;
154 while (p) {
155 char *n = (p->name) ? p->name : "";
156 char *i = (p->IOPname) ? p->IOPname : "";
157 p = p->next;
158 printf(" %12s -> %12s\n", i, n);
159 }
160 }
161 }
162 }
163
find_unit_by_fd(int fd,int * chassis,int * geoslot,unit_t ** unit_ptr)164 static int find_unit_by_fd(int fd, int *chassis, int *geoslot, unit_t **unit_ptr) {
165 int c, s;
166
167 for (c = 0; c <= MAX_CHASSIS; c++) {
168 for (s = 0; s <= MAX_GEOSLOT; s++) {
169 if (units[c][s].fd == fd || units[c][s].find_fd == fd) {
170 if (chassis) *chassis = c;
171 if (geoslot) *geoslot = s;
172 if (unit_ptr) *unit_ptr = &units[c][s];
173 return 1;
174 }
175 }
176 }
177 return 0;
178 }
179
read_client_nbytes(int fd,int count,unsigned char * buf)180 static int read_client_nbytes(int fd, int count, unsigned char *buf) {
181 unit_t *u;
182 int chassis, geoslot;
183 int len;
184
185 find_unit_by_fd(fd, &chassis, &geoslot, &u);
186 while (count) {
187 if ((len = recv(fd, buf, count, 0)) <= 0) return -1; /* read in whatever data was sent to us */
188 count -= len;
189 buf += len;
190 } /* till we have everything we are looking for */
191 return 0;
192 }
193
empty_unit_iface(unit_t * u)194 static void empty_unit_iface(unit_t *u) {
195 iface_t *p, *cur;
196
197 cur = u->iface;
198 while (cur) { /* loop over all the interface entries */
199 if (cur->name) free(cur->name); /* throwing away the contents if they exist */
200 if (cur->IOPname) free(cur->IOPname);
201 p = cur->next;
202 free(cur); /* then throw away the structure itself */
203 cur = p;
204 }
205 u->iface = 0; /* and finally remember that there are no remaining structure */
206 }
207
empty_unit(int chassis,int geoslot)208 static void empty_unit(int chassis, int geoslot) {
209 unit_t *u = &units[chassis][geoslot];
210
211 empty_unit_iface(u);
212 if (u->imsg) { /* then if an inbound message buffer exists */
213 u->imsg = (char *)realloc(u->imsg, 1); /* and re-allocate the old large buffer into a new small one */
214 if (u->imsg == NULL) { /* oops, realloc call failed */
215 fprintf(stderr, "Warning...call to realloc() failed, value of errno is %d\n", errno);
216
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 /* since we called malloc(), lets check to see if we actually got the memory */
316 if (u->serv_addr == NULL) { /* oops, we didn't get the memory requested */
317 fprintf(stderr, "malloc() request for u->serv_addr failed, value of errno is: %d\n", errno);
318 return 0;
319 }
320
321 }
322 ip = u->ip;
323 /* bzero() is deprecated, replaced with memset() */
324 memset((char *)u->serv_addr, 0, sizeof(struct sockaddr_in));
325 u->serv_addr->sin_family = AF_INET;
326 u->serv_addr->sin_addr.s_addr = inet_addr(ip);
327 u->serv_addr->sin_port = htons(IOP_SNIFFER_PORT);
328
329 if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
330 fprintf(stderr, "pcap can't open a socket for connecting to IOP at %s\n", ip);
331 return 0;
332 }
333 if (connect(sockfd, (struct sockaddr *)u->serv_addr, sizeof(struct sockaddr_in)) < 0) {
334 fprintf(stderr, "pcap can't connect to IOP at %s\n", ip);
335 return 0;
336 }
337 if (flag == LIVE) u->fd = sockfd;
338 else u->find_fd = sockfd;
339 u->first_time = 0;
340 return sockfd; /* return the non-zero file descriptor as a 'success' indicator */
341 }
342
343 static void close_with_IOP(int chassis, int geoslot, int flag) {
344 int *id;
345
346 if (flag == LIVE) id = &units[chassis][geoslot].fd;
347 else id = &units[chassis][geoslot].find_fd;
348
349 if (*id) { /* this was the last time, so... if we are connected... */
350 close(*id); /* disconnect us */
351 *id = 0; /* and forget that the descriptor exists because we are not open */
352 }
353 }
354
355 static void pcap_cleanup_acn(pcap_t *handle) {
356 int chassis, geoslot;
357 unit_t *u;
358
359 if (find_unit_by_fd(handle->fd, &chassis, &geoslot, &u) == 0)
360 return;
361 close_with_IOP(chassis, geoslot, LIVE);
362 if (u)
363 u->first_time = 0;
364 pcap_cleanup_live_common(handle);
365 }
366
367 static void send_to_fd(int fd, int len, unsigned char *str) {
368 int nwritten;
369 int chassis, geoslot;
370
371 while (len > 0) {
372 if ((nwritten = write(fd, str, len)) <= 0) {
373 find_unit_by_fd(fd, &chassis, &geoslot, NULL);
374 if (units[chassis][geoslot].fd == fd) close_with_IOP(chassis, geoslot, LIVE);
375 else if (units[chassis][geoslot].find_fd == fd) close_with_IOP(chassis, geoslot, FIND);
376 empty_unit(chassis, geoslot);
377 return;
378 }
379 len -= nwritten;
380 str += nwritten;
381 }
382 }
383
384 static void acn_freealldevs(void) {
385
386 pcap_if_t *iff, *next_iff;
387 pcap_addr_t *addr, *next_addr;
388
389 for (iff = acn_if_list; iff != NULL; iff = next_iff) {
390 next_iff = iff->next;
391 for (addr = iff->addresses; addr != NULL; addr = next_addr) {
392 next_addr = addr->next;
393 if (addr->addr) free(addr->addr);
394 if (addr->netmask) free(addr->netmask);
395 if (addr->broadaddr) free(addr->broadaddr);
396 if (addr->dstaddr) free(addr->dstaddr);
397 free(addr);
398 }
399 if (iff->name) free(iff->name);
400 if (iff->description) free(iff->description);
401 free(iff);
402 }
403 }
404
405 static void nonUnified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u) {
406
407 snprintf(buf, bufsize, "%s_%d_%d", proto, u->chassis, u->geoslot);
408 }
409
410 static void unified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u, int IOPportnum) {
411 int portnum;
412
413 portnum = ((u->chassis - 1) * 64) + ((u->geoslot - 1) * 8) + IOPportnum + 1;
414 snprintf(buf, bufsize, "%s_%d", proto, portnum);
415 }
416
417 static char *translate_IOP_to_pcap_name(unit_t *u, char *IOPname, bpf_u_int32 iftype) {
418 iface_t *iface_ptr, *iface;
419 char *name;
420 char buf[32];
421 char *proto;
422 char *port;
423 int IOPportnum = 0;
424
425 iface = malloc(sizeof(iface_t)); /* get memory for a structure */
426 if (iface == NULL) { /* oops, we didn't get the memory requested */
427 fprintf(stderr, "Error...couldn't allocate memory for interface structure...value of errno is: %d\n", errno);
428 return NULL;
429 }
430 memset((char *)iface, 0, sizeof(iface_t)); /* bzero is deprecated(), replaced with memset() */
431
432 iface->iftype = iftype; /* remember the interface type of this interface */
433
434 name = malloc(strlen(IOPname) + 1); /* get memory for the IOP's name */
435 if (name == NULL) { /* oops, we didn't get the memory requested */
436 fprintf(stderr, "Error...couldn't allocate memory for IOPname...value of errno is: %d\n", errno);
437 return NULL;
438 }
439
440 strcpy(name, IOPname); /* and copy it in */
441 iface->IOPname = name; /* and stick it into the structure */
442
443 if (strncmp(IOPname, "lo", 2) == 0) {
444 IOPportnum = atoi(&IOPname[2]);
445 switch (iftype) {
446 case DLT_EN10MB:
447 nonUnified_IOP_port_name(buf, sizeof buf, "lo", u);
448 break;
449 default:
450 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
451 break;
452 }
453 } else if (strncmp(IOPname, "eth", 3) == 0) {
454 IOPportnum = atoi(&IOPname[3]);
455 switch (iftype) {
456 case DLT_EN10MB:
457 nonUnified_IOP_port_name(buf, sizeof buf, "eth", u);
458 break;
459 default:
460 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
461 break;
462 }
463 } else if (strncmp(IOPname, "wan", 3) == 0) {
464 IOPportnum = atoi(&IOPname[3]);
465 switch (iftype) {
466 case DLT_SITA:
467 unified_IOP_port_name(buf, sizeof buf, "wan", u, IOPportnum);
468 break;
469 default:
470 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
471 break;
472 }
473 } else {
474 fprintf(stderr, "Error... invalid IOP name %s\n", IOPname);
475 return NULL;
476 }
477
478 name = malloc(strlen(buf) + 1); /* get memory for that name */
479 if (name == NULL) { /* oops, we didn't get the memory requested */
480 fprintf(stderr, "Error...couldn't allocate memory for IOP port name...value of errno is: %d\n", errno);
481 return NULL;
482 }
483
484 strcpy(name, buf); /* and copy it in */
485 iface->name = name; /* and stick it into the structure */
486
487 if (u->iface == 0) { /* if this is the first name */
488 u->iface = iface; /* stick this entry at the head of the list */
489 } else {
490 iface_ptr = u->iface;
491 while (iface_ptr->next) { /* othewise scan the list */
492 iface_ptr = iface_ptr->next; /* till we're at the last entry */
493 }
494 iface_ptr->next = iface; /* then tack this entry on the end of the list */
495 }
496 return iface->name;
497 }
498
499 static int if_sort(char *s1, char *s2) {
500 char *s1_p2, *s2_p2;
501 char str1[MAX_LINE_SIZE], str2[MAX_LINE_SIZE];
502 int s1_p1_len, s2_p1_len;
503 int retval;
504
505 if ((s1_p2 = strchr(s1, '_'))) { /* if an underscore is found... */
506 s1_p1_len = s1_p2 - s1; /* the prefix length is the difference in pointers */
507 s1_p2++; /* the suffix actually starts _after_ the underscore */
508 } else { /* otherwise... */
509 s1_p1_len = strlen(s1); /* the prefix length is the length of the string itself */
510 s1_p2 = 0; /* and there is no suffix */
511 }
512 if ((s2_p2 = strchr(s2, '_'))) { /* now do the same for the second string */
513 s2_p1_len = s2_p2 - s2;
514 s2_p2++;
515 } else {
516 s2_p1_len = strlen(s2);
517 s2_p2 = 0;
518 }
519 strncpy(str1, s1, (s1_p1_len > sizeof(str1)) ? s1_p1_len : sizeof(str1)); *(str1 + s1_p1_len) = 0;
520 strncpy(str2, s2, (s2_p1_len > sizeof(str2)) ? s2_p1_len : sizeof(str2)); *(str2 + s2_p1_len) = 0;
521 retval = strcmp(str1, str2);
522 if (retval != 0) return retval; /* if they are not identical, then we can quit now and return the indication */
523 return strcmp(s1_p2, s2_p2); /* otherwise we return the result of comparing the 2nd half of the string */
524 }
525
526 static void sort_if_table(void) {
527 pcap_if_t *p1, *p2, *prev, *temp;
528 int has_swapped;
529
530 if (!acn_if_list) return; /* nothing to do if the list is empty */
531
532 while (1) {
533 p1 = acn_if_list; /* start at the head of the list */
534 prev = 0;
535 has_swapped = 0;
536 while ((p2 = p1->next)) {
537 if (if_sort(p1->name, p2->name) > 0) {
538 if (prev) { /* we are swapping things that are _not_ at the head of the list */
539 temp = p2->next;
540 prev->next = p2;
541 p2->next = p1;
542 p1->next = temp;
543 } else { /* special treatment if we are swapping with the head of the list */
544 temp = p2->next;
545 acn_if_list= p2;
546 p2->next = p1;
547 p1->next = temp;
548 }
549 p1 = p2;
550 prev = p1;
551 has_swapped = 1;
552 }
553 prev = p1;
554 p1 = p1->next;
555 }
556 if (has_swapped == 0)
557 return;
558 }
559 return;
560 }
561
562 static int process_client_data (char *errbuf) { /* returns: -1 = error, 0 = OK */
563 int chassis, geoslot;
564 unit_t *u;
565 pcap_if_t *iff, *prev_iff;
566 pcap_addr_t *addr, *prev_addr;
567 char *ptr;
568 int address_count;
569 struct sockaddr_in *s;
570 char *newname;
571 bpf_u_int32 interfaceType;
572 unsigned char flags;
573
574 prev_iff = 0;
575 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
576 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { /* now loop over all the devices */
577 u = &units[chassis][geoslot];
578 empty_unit_iface(u);
579 ptr = u->imsg; /* point to the start of the msg for this IOP */
580 while (ptr < (u->imsg + u->len)) {
581 if ((iff = malloc(sizeof(pcap_if_t))) == NULL) {
582 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
583 return -1;
584 }
585 memset((char *)iff, 0, sizeof(pcap_if_t)); /* bzero() is deprecated, replaced with memset() */
586 if (acn_if_list == 0) acn_if_list = iff; /* remember the head of the list */
587 if (prev_iff) prev_iff->next = iff; /* insert a forward link */
588
589 if (*ptr) { /* if there is a count for the name */
590 if ((iff->name = malloc(*ptr + 1)) == NULL) { /* get that amount of space */
591 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
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 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
603 return -1;
604 }
605 memcpy(iff->description, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */
606 *(iff->description + *ptr) = 0; /* and null terminate the string */
607 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */
608 }
609 ptr++;
610
611 interfaceType = ntohl(*(bpf_u_int32 *)ptr);
612 ptr += 4; /* skip over the interface type */
613
614 flags = *ptr++;
615 if (flags) iff->flags = PCAP_IF_LOOPBACK; /* if this is a loopback style interface, lets mark it as such */
616
617 address_count = *ptr++;
618
619 prev_addr = 0;
620 while (address_count--) {
621 if ((addr = malloc(sizeof(pcap_addr_t))) == NULL) {
622 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
623 return -1;
624 }
625 + memset((char *)addr, 0, sizeof(pcap_addr_t)); /* bzero() is deprecated, replaced with memset() */
626 if (iff->addresses == 0) iff->addresses = addr;
627 if (prev_addr) prev_addr->next = addr; /* insert a forward link */
628 if (*ptr) { /* if there is a count for the address */
629 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { /* get that amount of space */
630 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
631 return -1;
632 }
633 memset((char *)s, 0, sizeof(struct sockaddr_in)); /* bzero() is deprecated, replaced with memset() */
634 addr->addr = (struct sockaddr *)s;
635 s->sin_family = AF_INET;
636 s->sin_addr.s_addr = *(bpf_u_int32 *)(ptr + 1); /* copy the address in */
637 ptr += *ptr; /* now move the pointer forwards according to the specified length of the address */
638 }
639 ptr++; /* then forwards one more for the 'length of the address' field */
640 if (*ptr) { /* process any netmask */
641 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
642 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
643 return -1;
644 }
645 /* bzero() is deprecated, replaced with memset() */
646 memset((char *)s, 0, sizeof(struct sockaddr_in));
647
648 addr->netmask = (struct sockaddr *)s;
649 s->sin_family = AF_INET;
650 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
651 ptr += *ptr;
652 }
653 ptr++;
654 if (*ptr) { /* process any broadcast address */
655 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
656 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
657 return -1;
658 }
659 /* bzero() is deprecated, replaced with memset() */
660 memset((char *)s, 0, sizeof(struct sockaddr_in));
661
662 addr->broadaddr = (struct sockaddr *)s;
663 s->sin_family = AF_INET;
664 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
665 ptr += *ptr;
666 }
667 ptr++;
668 if (*ptr) { /* process any destination address */
669 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
670 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
671 return -1;
672 }
673 /* bzero() is deprecated, replaced with memset() */
674 memset((char *)s, 0, sizeof(struct sockaddr_in));
675
676 addr->dstaddr = (struct sockaddr *)s;
677 s->sin_family = AF_INET;
678 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
679 ptr += *ptr;
680 }
681 ptr++;
682 prev_addr = addr;
683 }
684 prev_iff = iff;
685
686 newname = translate_IOP_to_pcap_name(u, iff->name, interfaceType); /* add a translation entry and get a point to the mangled name */
687 if ((iff->name = realloc(iff->name, strlen(newname) + 1)) == NULL) { /* we now re-write the name stored in the interface list */
688 snprintf(errbuf, PCAP_ERRBUF_SIZE, "realloc: %s", pcap_strerror(errno));
689 return -1;
690 }
691 strcpy(iff->name, newname); /* to this new name */
692 }
693 }
694 }
695 return 0;
696 }
697
698 static int read_client_data (int fd) {
699 unsigned char buf[256];
700 int chassis, geoslot;
701 unit_t *u;
702 int len;
703
704 find_unit_by_fd(fd, &chassis, &geoslot, &u);
705
706 if ((len = recv(fd, buf, sizeof(buf), 0)) <= 0) return 0; /* read in whatever data was sent to us */
707
708 if ((u->imsg = realloc(u->imsg, (u->len + len))) == NULL) /* extend the buffer for the new data */
709 return 0;
710 memcpy((u->imsg + u->len), buf, len); /* append the new data */
711 u->len += len;
712 return 1;
713 }
714
715 static void wait_for_all_answers(void) {
716 int retval;
717 struct timeval tv;
718 int fd;
719 int chassis, geoslot;
720
721 tv.tv_sec = 2;
722 tv.tv_usec = 0;
723
724 while (1) {
725 int flag = 0;
726 fd_set working_set;
727
728 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of descriptors we may be listening to */
729 if (FD_ISSET(fd, &readfds)) flag = 1; /* and see if there are any still set */
730 }
731 if (flag == 0) return; /* we are done, when they are all gone */
732
733 memcpy(&working_set, &readfds, sizeof(readfds)); /* otherwise, we still have to listen for more stuff, till we timeout */
734 retval = select(max_fs + 1, &working_set, NULL, NULL, &tv);
735 if (retval == -1) { /* an error occured !!!!! */
736 return;
737 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */
738 printf("timeout\n");
739 return;
740 } else {
741 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of things to do, and do them */
742 if (FD_ISSET(fd, &working_set)) {
743 if (read_client_data(fd) == 0) { /* if the socket has closed */
744 FD_CLR(fd, &readfds); /* and descriptors we listen to for errors */
745 find_unit_by_fd(fd, &chassis, &geoslot, NULL);
746 close_with_IOP(chassis, geoslot, FIND); /* and close out connection to him */
747 }
748 }
749 }
750 }
751 }
752 }
753
754 static char *get_error_response(int fd, char *errbuf) { /* return a pointer on error, NULL on no error */
755 char byte;
756 int len = 0;
757
758 while (1) {
759 recv(fd, &byte, 1, 0); /* read another byte in */
760 if (errbuf && (len++ < PCAP_ERRBUF_SIZE)) { /* and if there is still room in the buffer */
761 *errbuf++ = byte; /* stick it in */
762 *errbuf = '\0'; /* ensure the string is null terminated just in case we might exceed the buffer's size */
763 }
764 if (byte == '\0') {
765 if (len > 1) { return errbuf; }
766 else { return NULL; }
767 }
768 }
769 }
770
771 int acn_findalldevs(char *errbuf) { /* returns: -1 = error, 0 = OK */
772 int chassis, geoslot;
773 unit_t *u;
774
775 FD_ZERO(&readfds);
776 max_fs = 0;
777 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
778 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
779 u = &units[chassis][geoslot];
780 if (u->ip && (open_with_IOP(u, FIND))) { /* connect to the remote IOP */
781 send_to_fd(u->find_fd, 1, (unsigned char *)"\0");
782 if (get_error_response(u->find_fd, errbuf))
783 close_with_IOP(chassis, geoslot, FIND);
784 else {
785 if (u->find_fd > max_fs)
786 max_fs = u->find_fd; /* remember the highest number currently in use */
787 FD_SET(u->find_fd, &readfds); /* we are going to want to read this guy's response to */
788 u->len = 0;
789 send_to_fd(u->find_fd, 1, (unsigned char *)"Q"); /* this interface query request */
790 }
791 }
792 }
793 }
794 wait_for_all_answers();
795 if (process_client_data(errbuf))
796 return -1;
797 sort_if_table();
798 return 0;
799 }
800
801 static int pcap_stats_acn(pcap_t *handle, struct pcap_stat *ps) {
802 unsigned char buf[12];
803
804 send_to_fd(handle->fd, 1, (unsigned char *)"S"); /* send the get_stats command to the IOP */
805
806 if (read_client_nbytes(handle->fd, sizeof(buf), buf) == -1) return -1; /* try reading the required bytes */
807
808 ps->ps_recv = ntohl(*(uint32_t *)&buf[0]); /* break the buffer into its three 32 bit components */
809 ps->ps_drop = ntohl(*(uint32_t *)&buf[4]);
810 ps->ps_ifdrop = ntohl(*(uint32_t *)&buf[8]);
811
812 return 0;
813 }
814
815 static int acn_open_live(const char *name, char *errbuf, int *linktype) { /* returns 0 on error, else returns the file descriptor */
816 int chassis, geoslot;
817 unit_t *u;
818 iface_t *p;
819 pcap_if_t *alldevsp;
820
821 pcap_findalldevs_interfaces(&alldevsp, errbuf);
822 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */
823 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
824 u = &units[chassis][geoslot];
825 if (u->ip != NULL) {
826 p = u->iface;
827 while (p) { /* and all interfaces... */
828 if (p->IOPname && p->name && (strcmp(p->name, name) == 0)) { /* and if we found the interface we want... */
829 *linktype = p->iftype;
830 open_with_IOP(u, LIVE); /* start a connection with that IOP */
831 send_to_fd(u->fd, strlen(p->IOPname)+1, (unsigned char *)p->IOPname); /* send the IOP's interface name, and a terminating null */
832 if (get_error_response(u->fd, errbuf)) {
833 return -1;
834 }
835 return u->fd; /* and return that open descriptor */
836 }
837 p = p->next;
838 }
839 }
840 }
841 }
842 return -1; /* if the interface wasn't found, return an error */
843 }
844
845 static void acn_start_monitor(int fd, int snaplen, int timeout, int promiscuous, int direction) {
846 unsigned char buf[8];
847 unit_t *u;
848
849 //printf("acn_start_monitor()\n"); // fulko
850 find_unit_by_fd(fd, NULL, NULL, &u);
851 if (u->first_time == 0) {
852 buf[0] = 'M';
853 *(uint32_t *)&buf[1] = htonl(snaplen);
854 buf[5] = timeout;
855 buf[6] = promiscuous;
856 buf[7] = direction;
857 //printf("acn_start_monitor() first time\n"); // fulko
858 send_to_fd(fd, 8, buf); /* send the start monitor command with its parameters to the IOP */
859 u->first_time = 1;
860 }
861 //printf("acn_start_monitor() complete\n"); // fulko
862 }
863
864 static int pcap_inject_acn(pcap_t *p, const void *buf _U_, size_t size _U_) {
865 strlcpy(p->errbuf, "Sending packets isn't supported on ACN adapters",
866 PCAP_ERRBUF_SIZE);
867 return (-1);
868 }
869
870 static int pcap_setfilter_acn(pcap_t *handle, struct bpf_program *bpf) {
871 int fd = handle->fd;
872 int count;
873 struct bpf_insn *p;
874 uint16_t shortInt;
875 uint32_t longInt;
876
877 send_to_fd(fd, 1, (unsigned char *)"F"); /* BPF filter follows command */
878 count = bpf->bf_len;
879 longInt = htonl(count);
880 send_to_fd(fd, 4, (unsigned char *)&longInt); /* send the instruction sequence count */
881 p = bpf->bf_insns;
882 while (count--) { /* followed by the list of instructions */
883 shortInt = htons(p->code);
884 longInt = htonl(p->k);
885 send_to_fd(fd, 2, (unsigned char *)&shortInt);
886 send_to_fd(fd, 1, (unsigned char *)&p->jt);
887 send_to_fd(fd, 1, (unsigned char *)&p->jf);
888 send_to_fd(fd, 4, (unsigned char *)&longInt);
889 p++;
890 }
891 if (get_error_response(fd, NULL))
892 return -1;
893 return 0;
894 }
895
896 static int pcap_setdirection_acn(pcap_t *handle, pcap_direction_t d) {
897 snprintf(handle->errbuf, sizeof(handle->errbuf),
898 "Setting direction is not supported on ACN adapters");
899 return -1;
900 }
901
902 static int acn_read_n_bytes_with_timeout(pcap_t *handle, int count) {
903 struct timeval tv;
904 int retval, fd;
905 fd_set r_fds;
906 fd_set w_fds;
907 u_char *bp;
908 int len = 0;
909 int offset = 0;
910
911 tv.tv_sec = 5;
912 tv.tv_usec = 0;
913
914 fd = handle->fd;
915 FD_ZERO(&r_fds);
916 FD_SET(fd, &r_fds);
917 memcpy(&w_fds, &r_fds, sizeof(r_fds));
918 bp = handle->bp;
919 while (count) {
920 retval = select(fd + 1, &w_fds, NULL, NULL, &tv);
921 if (retval == -1) { /* an error occured !!!!! */
922 // fprintf(stderr, "error during packet data read\n");
923 return -1; /* but we need to return a good indication to prevent unneccessary popups */
924 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */
925 // fprintf(stderr, "timeout during packet data read\n");
926 return -1;
927 } else {
928 if ((len = recv(fd, (bp + offset), count, 0)) <= 0) {
929 // fprintf(stderr, "premature exit during packet data rx\n");
930 return -1;
931 }
932 count -= len;
933 offset += len;
934 }
935 }
936 return 0;
937 }
938
939 static int pcap_read_acn(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) {
940 #define HEADER_SIZE (4 * 4)
941 unsigned char packet_header[HEADER_SIZE];
942 struct pcap_pkthdr pcap_header;
943
944 //printf("pcap_read_acn()\n"); // fulko
945 acn_start_monitor(handle->fd, handle->snapshot, handle->opt.timeout, handle->opt.promisc, handle->direction); /* maybe tell him to start monitoring */
946 //printf("pcap_read_acn() after start monitor\n"); // fulko
947
948 handle->bp = packet_header;
949 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 */
950
951 pcap_header.ts.tv_sec = ntohl(*(uint32_t *)&packet_header[0]); /* tv_sec */
952 pcap_header.ts.tv_usec = ntohl(*(uint32_t *)&packet_header[4]); /* tv_usec */
953 pcap_header.caplen = ntohl(*(uint32_t *)&packet_header[8]); /* caplen */
954 pcap_header.len = ntohl(*(uint32_t *)&packet_header[12]); /* len */
955
956 handle->bp = handle->buffer + handle->offset; /* start off the receive pointer at the right spot */
957 if (acn_read_n_bytes_with_timeout(handle, pcap_header.caplen) == -1) return 0; /* then try to read in the rest of the data */
958
959 callback(user, &pcap_header, handle->bp); /* call the user supplied callback function */
960 return 1;
961 }
962
963 static int pcap_activate_sita(pcap_t *handle) {
964 int fd;
965
966 if (handle->opt.rfmon) {
967 /*
968 * No monitor mode on SITA devices (they're not Wi-Fi
969 * devices).
970 */
971 return PCAP_ERROR_RFMON_NOTSUP;
972 }
973
974 /* Initialize some components of the pcap structure. */
975
976 handle->inject_op = pcap_inject_acn;
977 handle->setfilter_op = pcap_setfilter_acn;
978 handle->setdirection_op = pcap_setdirection_acn;
979 handle->set_datalink_op = NULL; /* can't change data link type */
980 handle->getnonblock_op = pcap_getnonblock_fd;
981 handle->setnonblock_op = pcap_setnonblock_fd;
982 handle->cleanup_op = pcap_cleanup_acn;
983 handle->read_op = pcap_read_acn;
984 handle->stats_op = pcap_stats_acn;
985
986 fd = acn_open_live(handle->opt.source, handle->errbuf,
987 &handle->linktype);
988 if (fd == -1)
989 return PCAP_ERROR;
990 handle->fd = fd;
991 handle->bufsize = handle->snapshot;
992
993 /* Allocate the buffer */
994
995 handle->buffer = malloc(handle->bufsize + handle->offset);
996 if (!handle->buffer) {
997 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
998 "malloc: %s", pcap_strerror(errno));
999 pcap_cleanup_acn(handle);
1000 return PCAP_ERROR;
1001 }
1002
1003 /*
1004 * "handle->fd" is a socket, so "select()" and "poll()"
1005 * should work on it.
1006 */
1007 handle->selectable_fd = handle->fd;
1008
1009 return 0;
1010 }
1011
1012 pcap_t *pcap_create_interface(const char *device, char *ebuf) {
1013 pcap_t *p;
1014
1015 p = pcap_create_common(device, ebuf, 0);
1016 if (p == NULL)
1017 return (NULL);
1018
1019 p->activate_op = pcap_activate_sita;
1020 return (p);
1021 }
1022