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
dump_interface_list(void)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
dump(unsigned char * ptr,int i,int indent)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
dump_interface_list_p(void)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
dump_unit_table(void)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
find_unit_by_fd(int fd,int * chassis,int * geoslot,unit_t ** unit_ptr)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
read_client_nbytes(int fd,int count,unsigned char * buf)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
empty_unit_iface(unit_t * u)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
empty_unit(int chassis,int geoslot)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
empty_unit_table(void)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
find_nth_interface_name(int n)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
acn_parse_hosts_file(char * errbuf)259 int acn_parse_hosts_file(char *errbuf) { /* returns: -1 = error, 0 = OK */
260 FILE *fp;
261 char buf[MAX_LINE_SIZE];
262 char *ptr, *ptr2;
263 int pos;
264 int chassis, geoslot;
265 unit_t *u;
266
267 empty_unit_table();
268 if ((fp = fopen("/etc/hosts", "r")) == NULL) { /* try to open the hosts file and if it fails */
269 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot open '/etc/hosts' for reading."); /* return the nohostsfile error response */
270 return -1;
271 }
272 while (fgets(buf, MAX_LINE_SIZE-1, fp)) { /* while looping over the file */
273
274 pos = strcspn(buf, "#\n\r"); /* find the first comment character or EOL */
275 *(buf + pos) = '\0'; /* and clobber it and anything that follows it */
276
277 pos = strspn(buf, " \t"); /* then find the first non-white space */
278 if (pos == strlen(buf)) /* if there is nothing but white space on the line */
279 continue; /* ignore that empty line */
280 ptr = buf + pos; /* and skip over any of that leading whitespace */
281
282 if ((ptr2 = strstr(ptr, "_I_")) == NULL) /* skip any lines that don't have names that look like they belong to IOPs */
283 continue;
284 if (*(ptr2 + 4) != '_') /* and skip other lines that have names that don't look like ACN components */
285 continue;
286 *(ptr + strcspn(ptr, " \t")) = '\0'; /* null terminate the IP address so its a standalone string */
287
288 chassis = *(ptr2 + 3) - '0'; /* extract the chassis number */
289 geoslot = *(ptr2 + 5) - '0'; /* and geo-slot number */
290 if (chassis < 1 || chassis > MAX_CHASSIS ||
291 geoslot < 1 || geoslot > MAX_GEOSLOT) { /* if the chassis and/or slot numbers appear to be bad... */
292 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "Invalid ACN name in '/etc/hosts'."); /* warn the user */
293 continue; /* and ignore the entry */
294 }
295 if ((ptr2 = (char *)malloc(strlen(ptr) + 1)) == NULL) {
296 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
297 continue;
298 }
299 strcpy(ptr2, ptr); /* copy the IP address into our malloc'ed memory */
300 u = &units[chassis][geoslot];
301 u->ip = ptr2; /* and remember the whole shebang */
302 u->chassis = chassis;
303 u->geoslot = geoslot;
304 }
305 fclose(fp);
306 if (*errbuf) return -1;
307 else return 0;
308 }
309
open_with_IOP(unit_t * u,int flag)310 static int open_with_IOP(unit_t *u, int flag) {
311 int sockfd;
312 char *ip;
313
314 if (u->serv_addr == NULL) {
315 u->serv_addr = malloc(sizeof(struct sockaddr_in));
316
317 /* since we called malloc(), lets check to see if we actually got the memory */
318 if (u->serv_addr == NULL) { /* oops, we didn't get the memory requested */
319 fprintf(stderr, "malloc() request for u->serv_addr failed, value of errno is: %d\n", errno);
320 return 0;
321 }
322
323 }
324 ip = u->ip;
325 /* bzero() is deprecated, replaced with memset() */
326 memset((char *)u->serv_addr, 0, sizeof(struct sockaddr_in));
327 u->serv_addr->sin_family = AF_INET;
328 u->serv_addr->sin_addr.s_addr = inet_addr(ip);
329 u->serv_addr->sin_port = htons(IOP_SNIFFER_PORT);
330
331 if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
332 fprintf(stderr, "pcap can't open a socket for connecting to IOP at %s\n", ip);
333 return 0;
334 }
335 if (connect(sockfd, (struct sockaddr *)u->serv_addr, sizeof(struct sockaddr_in)) < 0) {
336 fprintf(stderr, "pcap can't connect to IOP at %s\n", ip);
337 return 0;
338 }
339 if (flag == LIVE) u->fd = sockfd;
340 else u->find_fd = sockfd;
341 u->first_time = 0;
342 return sockfd; /* return the non-zero file descriptor as a 'success' indicator */
343 }
344
close_with_IOP(int chassis,int geoslot,int flag)345 static void close_with_IOP(int chassis, int geoslot, int flag) {
346 int *id;
347
348 if (flag == LIVE) id = &units[chassis][geoslot].fd;
349 else id = &units[chassis][geoslot].find_fd;
350
351 if (*id) { /* this was the last time, so... if we are connected... */
352 close(*id); /* disconnect us */
353 *id = 0; /* and forget that the descriptor exists because we are not open */
354 }
355 }
356
pcap_cleanup_acn(pcap_t * handle)357 static void pcap_cleanup_acn(pcap_t *handle) {
358 int chassis, geoslot;
359 unit_t *u;
360
361 if (find_unit_by_fd(handle->fd, &chassis, &geoslot, &u) == 0)
362 return;
363 close_with_IOP(chassis, geoslot, LIVE);
364 if (u)
365 u->first_time = 0;
366 pcap_cleanup_live_common(handle);
367 }
368
send_to_fd(int fd,int len,unsigned char * str)369 static void send_to_fd(int fd, int len, unsigned char *str) {
370 int nwritten;
371 int chassis, geoslot;
372
373 while (len > 0) {
374 if ((nwritten = write(fd, str, len)) <= 0) {
375 find_unit_by_fd(fd, &chassis, &geoslot, NULL);
376 if (units[chassis][geoslot].fd == fd) close_with_IOP(chassis, geoslot, LIVE);
377 else if (units[chassis][geoslot].find_fd == fd) close_with_IOP(chassis, geoslot, FIND);
378 empty_unit(chassis, geoslot);
379 return;
380 }
381 len -= nwritten;
382 str += nwritten;
383 }
384 }
385
acn_freealldevs(void)386 static void acn_freealldevs(void) {
387
388 pcap_if_t *iff, *next_iff;
389 pcap_addr_t *addr, *next_addr;
390
391 for (iff = acn_if_list; iff != NULL; iff = next_iff) {
392 next_iff = iff->next;
393 for (addr = iff->addresses; addr != NULL; addr = next_addr) {
394 next_addr = addr->next;
395 if (addr->addr) free(addr->addr);
396 if (addr->netmask) free(addr->netmask);
397 if (addr->broadaddr) free(addr->broadaddr);
398 if (addr->dstaddr) free(addr->dstaddr);
399 free(addr);
400 }
401 if (iff->name) free(iff->name);
402 if (iff->description) free(iff->description);
403 free(iff);
404 }
405 }
406
nonUnified_IOP_port_name(char * buf,size_t bufsize,const char * proto,unit_t * u)407 static void nonUnified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u) {
408
409 pcap_snprintf(buf, bufsize, "%s_%d_%d", proto, u->chassis, u->geoslot);
410 }
411
unified_IOP_port_name(char * buf,size_t bufsize,const char * proto,unit_t * u,int IOPportnum)412 static void unified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u, int IOPportnum) {
413 int portnum;
414
415 portnum = ((u->chassis - 1) * 64) + ((u->geoslot - 1) * 8) + IOPportnum + 1;
416 pcap_snprintf(buf, bufsize, "%s_%d", proto, portnum);
417 }
418
translate_IOP_to_pcap_name(unit_t * u,char * IOPname,bpf_u_int32 iftype)419 static char *translate_IOP_to_pcap_name(unit_t *u, char *IOPname, bpf_u_int32 iftype) {
420 iface_t *iface_ptr, *iface;
421 char *name;
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 name = malloc(strlen(IOPname) + 1); /* get memory for the IOP's name */
437 if (name == 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 strcpy(name, IOPname); /* and copy it in */
443 iface->IOPname = name; /* and stick it into the structure */
444
445 if (strncmp(IOPname, "lo", 2) == 0) {
446 IOPportnum = atoi(&IOPname[2]);
447 switch (iftype) {
448 case DLT_EN10MB:
449 nonUnified_IOP_port_name(buf, sizeof buf, "lo", u);
450 break;
451 default:
452 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
453 break;
454 }
455 } else if (strncmp(IOPname, "eth", 3) == 0) {
456 IOPportnum = atoi(&IOPname[3]);
457 switch (iftype) {
458 case DLT_EN10MB:
459 nonUnified_IOP_port_name(buf, sizeof buf, "eth", u);
460 break;
461 default:
462 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
463 break;
464 }
465 } else if (strncmp(IOPname, "wan", 3) == 0) {
466 IOPportnum = atoi(&IOPname[3]);
467 switch (iftype) {
468 case DLT_SITA:
469 unified_IOP_port_name(buf, sizeof buf, "wan", u, IOPportnum);
470 break;
471 default:
472 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum);
473 break;
474 }
475 } else {
476 fprintf(stderr, "Error... invalid IOP name %s\n", IOPname);
477 return NULL;
478 }
479
480 name = malloc(strlen(buf) + 1); /* get memory for that name */
481 if (name == NULL) { /* oops, we didn't get the memory requested */
482 fprintf(stderr, "Error...couldn't allocate memory for IOP port name...value of errno is: %d\n", errno);
483 return NULL;
484 }
485
486 strcpy(name, buf); /* and copy it in */
487 iface->name = name; /* and stick it into the structure */
488
489 if (u->iface == 0) { /* if this is the first name */
490 u->iface = iface; /* stick this entry at the head of the list */
491 } else {
492 iface_ptr = u->iface;
493 while (iface_ptr->next) { /* othewise scan the list */
494 iface_ptr = iface_ptr->next; /* till we're at the last entry */
495 }
496 iface_ptr->next = iface; /* then tack this entry on the end of the list */
497 }
498 return iface->name;
499 }
500
if_sort(char * s1,char * s2)501 static int if_sort(char *s1, char *s2) {
502 char *s1_p2, *s2_p2;
503 char str1[MAX_LINE_SIZE], str2[MAX_LINE_SIZE];
504 int s1_p1_len, s2_p1_len;
505 int retval;
506
507 if ((s1_p2 = strchr(s1, '_'))) { /* if an underscore is found... */
508 s1_p1_len = s1_p2 - s1; /* the prefix length is the difference in pointers */
509 s1_p2++; /* the suffix actually starts _after_ the underscore */
510 } else { /* otherwise... */
511 s1_p1_len = strlen(s1); /* the prefix length is the length of the string itself */
512 s1_p2 = 0; /* and there is no suffix */
513 }
514 if ((s2_p2 = strchr(s2, '_'))) { /* now do the same for the second string */
515 s2_p1_len = s2_p2 - s2;
516 s2_p2++;
517 } else {
518 s2_p1_len = strlen(s2);
519 s2_p2 = 0;
520 }
521 strncpy(str1, s1, (s1_p1_len > sizeof(str1)) ? s1_p1_len : sizeof(str1)); *(str1 + s1_p1_len) = 0;
522 strncpy(str2, s2, (s2_p1_len > sizeof(str2)) ? s2_p1_len : sizeof(str2)); *(str2 + s2_p1_len) = 0;
523 retval = strcmp(str1, str2);
524 if (retval != 0) return retval; /* if they are not identical, then we can quit now and return the indication */
525 return strcmp(s1_p2, s2_p2); /* otherwise we return the result of comparing the 2nd half of the string */
526 }
527
sort_if_table(void)528 static void sort_if_table(void) {
529 pcap_if_t *p1, *p2, *prev, *temp;
530 int has_swapped;
531
532 if (!acn_if_list) return; /* nothing to do if the list is empty */
533
534 while (1) {
535 p1 = acn_if_list; /* start at the head of the list */
536 prev = 0;
537 has_swapped = 0;
538 while ((p2 = p1->next)) {
539 if (if_sort(p1->name, p2->name) > 0) {
540 if (prev) { /* we are swapping things that are _not_ at the head of the list */
541 temp = p2->next;
542 prev->next = p2;
543 p2->next = p1;
544 p1->next = temp;
545 } else { /* special treatment if we are swapping with the head of the list */
546 temp = p2->next;
547 acn_if_list= p2;
548 p2->next = p1;
549 p1->next = temp;
550 }
551 p1 = p2;
552 prev = p1;
553 has_swapped = 1;
554 }
555 prev = p1;
556 p1 = p1->next;
557 }
558 if (has_swapped == 0)
559 return;
560 }
561 return;
562 }
563
process_client_data(char * errbuf)564 static int process_client_data (char *errbuf) { /* returns: -1 = error, 0 = OK */
565 int chassis, geoslot;
566 unit_t *u;
567 pcap_if_t *iff, *prev_iff;
568 pcap_addr_t *addr, *prev_addr;
569 char *ptr;
570 int address_count;
571 struct sockaddr_in *s;
572 char *newname;
573 bpf_u_int32 interfaceType;
574 unsigned char flags;
575 void *bigger_buffer;
576
577 prev_iff = 0;
578 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
579 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { /* now loop over all the devices */
580 u = &units[chassis][geoslot];
581 empty_unit_iface(u);
582 ptr = u->imsg; /* point to the start of the msg for this IOP */
583 while (ptr < (u->imsg + u->len)) {
584 if ((iff = malloc(sizeof(pcap_if_t))) == NULL) {
585 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
586 return -1;
587 }
588 memset((char *)iff, 0, sizeof(pcap_if_t)); /* bzero() is deprecated, replaced with memset() */
589 if (acn_if_list == 0) acn_if_list = iff; /* remember the head of the list */
590 if (prev_iff) prev_iff->next = iff; /* insert a forward link */
591
592 if (*ptr) { /* if there is a count for the name */
593 if ((iff->name = malloc(*ptr + 1)) == NULL) { /* get that amount of space */
594 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
595 return -1;
596 }
597 memcpy(iff->name, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */
598 *(iff->name + *ptr) = 0; /* and null terminate the string */
599 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */
600 }
601 ptr++;
602
603 if (*ptr) { /* if there is a count for the description */
604 if ((iff->description = malloc(*ptr + 1)) == NULL) { /* get that amount of space */
605 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
606 return -1;
607 }
608 memcpy(iff->description, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */
609 *(iff->description + *ptr) = 0; /* and null terminate the string */
610 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */
611 }
612 ptr++;
613
614 interfaceType = ntohl(*(bpf_u_int32 *)ptr);
615 ptr += 4; /* skip over the interface type */
616
617 flags = *ptr++;
618 if (flags) iff->flags = PCAP_IF_LOOPBACK; /* if this is a loopback style interface, lets mark it as such */
619
620 address_count = *ptr++;
621
622 prev_addr = 0;
623 while (address_count--) {
624 if ((addr = malloc(sizeof(pcap_addr_t))) == NULL) {
625 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
626 return -1;
627 }
628 memset((char *)addr, 0, sizeof(pcap_addr_t)); /* bzero() is deprecated, replaced with memset() */
629 if (iff->addresses == 0) iff->addresses = addr;
630 if (prev_addr) prev_addr->next = addr; /* insert a forward link */
631 if (*ptr) { /* if there is a count for the address */
632 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { /* get that amount of space */
633 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
634 return -1;
635 }
636 memset((char *)s, 0, sizeof(struct sockaddr_in)); /* bzero() is deprecated, replaced with memset() */
637 addr->addr = (struct sockaddr *)s;
638 s->sin_family = AF_INET;
639 s->sin_addr.s_addr = *(bpf_u_int32 *)(ptr + 1); /* copy the address in */
640 ptr += *ptr; /* now move the pointer forwards according to the specified length of the address */
641 }
642 ptr++; /* then forwards one more for the 'length of the address' field */
643 if (*ptr) { /* process any netmask */
644 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
645 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
646 return -1;
647 }
648 /* bzero() is deprecated, replaced with memset() */
649 memset((char *)s, 0, sizeof(struct sockaddr_in));
650
651 addr->netmask = (struct sockaddr *)s;
652 s->sin_family = AF_INET;
653 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
654 ptr += *ptr;
655 }
656 ptr++;
657 if (*ptr) { /* process any broadcast address */
658 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
659 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
660 return -1;
661 }
662 /* bzero() is deprecated, replaced with memset() */
663 memset((char *)s, 0, sizeof(struct sockaddr_in));
664
665 addr->broadaddr = (struct sockaddr *)s;
666 s->sin_family = AF_INET;
667 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
668 ptr += *ptr;
669 }
670 ptr++;
671 if (*ptr) { /* process any destination address */
672 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) {
673 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
674 return -1;
675 }
676 /* bzero() is deprecated, replaced with memset() */
677 memset((char *)s, 0, sizeof(struct sockaddr_in));
678
679 addr->dstaddr = (struct sockaddr *)s;
680 s->sin_family = AF_INET;
681 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1);
682 ptr += *ptr;
683 }
684 ptr++;
685 prev_addr = addr;
686 }
687 prev_iff = iff;
688
689 newname = translate_IOP_to_pcap_name(u, iff->name, interfaceType); /* add a translation entry and get a point to the mangled name */
690 bigger_buffer = realloc(iff->name, strlen(newname) + 1));
691 if (bigger_buffer == NULL) { /* we now re-write the name stored in the interface list */
692 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "realloc: %s", pcap_strerror(errno));
693 return -1;
694 }
695 iff->name = bigger_buffer;
696 strcpy(iff->name, newname); /* to this new name */
697 }
698 }
699 }
700 return 0;
701 }
702
read_client_data(int fd)703 static int read_client_data (int fd) {
704 unsigned char buf[256];
705 int chassis, geoslot;
706 unit_t *u;
707 int len;
708
709 find_unit_by_fd(fd, &chassis, &geoslot, &u);
710
711 if ((len = recv(fd, buf, sizeof(buf), 0)) <= 0) return 0; /* read in whatever data was sent to us */
712
713 if ((u->imsg = realloc(u->imsg, (u->len + len))) == NULL) /* extend the buffer for the new data */
714 return 0;
715 memcpy((u->imsg + u->len), buf, len); /* append the new data */
716 u->len += len;
717 return 1;
718 }
719
wait_for_all_answers(void)720 static void wait_for_all_answers(void) {
721 int retval;
722 struct timeval tv;
723 int fd;
724 int chassis, geoslot;
725
726 tv.tv_sec = 2;
727 tv.tv_usec = 0;
728
729 while (1) {
730 int flag = 0;
731 fd_set working_set;
732
733 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of descriptors we may be listening to */
734 if (FD_ISSET(fd, &readfds)) flag = 1; /* and see if there are any still set */
735 }
736 if (flag == 0) return; /* we are done, when they are all gone */
737
738 memcpy(&working_set, &readfds, sizeof(readfds)); /* otherwise, we still have to listen for more stuff, till we timeout */
739 retval = select(max_fs + 1, &working_set, NULL, NULL, &tv);
740 if (retval == -1) { /* an error occured !!!!! */
741 return;
742 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */
743 printf("timeout\n");
744 return;
745 } else {
746 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of things to do, and do them */
747 if (FD_ISSET(fd, &working_set)) {
748 if (read_client_data(fd) == 0) { /* if the socket has closed */
749 FD_CLR(fd, &readfds); /* and descriptors we listen to for errors */
750 find_unit_by_fd(fd, &chassis, &geoslot, NULL);
751 close_with_IOP(chassis, geoslot, FIND); /* and close out connection to him */
752 }
753 }
754 }
755 }
756 }
757 }
758
get_error_response(int fd,char * errbuf)759 static char *get_error_response(int fd, char *errbuf) { /* return a pointer on error, NULL on no error */
760 char byte;
761 int len = 0;
762
763 while (1) {
764 recv(fd, &byte, 1, 0); /* read another byte in */
765 if (errbuf && (len++ < PCAP_ERRBUF_SIZE)) { /* and if there is still room in the buffer */
766 *errbuf++ = byte; /* stick it in */
767 *errbuf = '\0'; /* ensure the string is null terminated just in case we might exceed the buffer's size */
768 }
769 if (byte == '\0') {
770 if (len > 1) { return errbuf; }
771 else { return NULL; }
772 }
773 }
774 }
775
acn_findalldevs(char * errbuf)776 int acn_findalldevs(char *errbuf) { /* returns: -1 = error, 0 = OK */
777 int chassis, geoslot;
778 unit_t *u;
779
780 FD_ZERO(&readfds);
781 max_fs = 0;
782 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) {
783 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
784 u = &units[chassis][geoslot];
785 if (u->ip && (open_with_IOP(u, FIND))) { /* connect to the remote IOP */
786 send_to_fd(u->find_fd, 1, (unsigned char *)"\0");
787 if (get_error_response(u->find_fd, errbuf))
788 close_with_IOP(chassis, geoslot, FIND);
789 else {
790 if (u->find_fd > max_fs)
791 max_fs = u->find_fd; /* remember the highest number currently in use */
792 FD_SET(u->find_fd, &readfds); /* we are going to want to read this guy's response to */
793 u->len = 0;
794 send_to_fd(u->find_fd, 1, (unsigned char *)"Q"); /* this interface query request */
795 }
796 }
797 }
798 }
799 wait_for_all_answers();
800 if (process_client_data(errbuf))
801 return -1;
802 sort_if_table();
803 return 0;
804 }
805
pcap_stats_acn(pcap_t * handle,struct pcap_stat * ps)806 static int pcap_stats_acn(pcap_t *handle, struct pcap_stat *ps) {
807 unsigned char buf[12];
808
809 send_to_fd(handle->fd, 1, (unsigned char *)"S"); /* send the get_stats command to the IOP */
810
811 if (read_client_nbytes(handle->fd, sizeof(buf), buf) == -1) return -1; /* try reading the required bytes */
812
813 ps->ps_recv = ntohl(*(uint32_t *)&buf[0]); /* break the buffer into its three 32 bit components */
814 ps->ps_drop = ntohl(*(uint32_t *)&buf[4]);
815 ps->ps_ifdrop = ntohl(*(uint32_t *)&buf[8]);
816
817 return 0;
818 }
819
acn_open_live(const char * name,char * errbuf,int * linktype)820 static int acn_open_live(const char *name, char *errbuf, int *linktype) { /* returns 0 on error, else returns the file descriptor */
821 int chassis, geoslot;
822 unit_t *u;
823 iface_t *p;
824 pcap_if_t *alldevsp;
825
826 pcap_platform_finddevs(&alldevsp, errbuf);
827 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */
828 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) {
829 u = &units[chassis][geoslot];
830 if (u->ip != NULL) {
831 p = u->iface;
832 while (p) { /* and all interfaces... */
833 if (p->IOPname && p->name && (strcmp(p->name, name) == 0)) { /* and if we found the interface we want... */
834 *linktype = p->iftype;
835 open_with_IOP(u, LIVE); /* start a connection with that IOP */
836 send_to_fd(u->fd, strlen(p->IOPname)+1, (unsigned char *)p->IOPname); /* send the IOP's interface name, and a terminating null */
837 if (get_error_response(u->fd, errbuf)) {
838 return -1;
839 }
840 return u->fd; /* and return that open descriptor */
841 }
842 p = p->next;
843 }
844 }
845 }
846 }
847 return -1; /* if the interface wasn't found, return an error */
848 }
849
acn_start_monitor(int fd,int snaplen,int timeout,int promiscuous,int direction)850 static void acn_start_monitor(int fd, int snaplen, int timeout, int promiscuous, int direction) {
851 unsigned char buf[8];
852 unit_t *u;
853
854 //printf("acn_start_monitor()\n"); // fulko
855 find_unit_by_fd(fd, NULL, NULL, &u);
856 if (u->first_time == 0) {
857 buf[0] = 'M';
858 *(uint32_t *)&buf[1] = htonl(snaplen);
859 buf[5] = timeout;
860 buf[6] = promiscuous;
861 buf[7] = direction;
862 //printf("acn_start_monitor() first time\n"); // fulko
863 send_to_fd(fd, 8, buf); /* send the start monitor command with its parameters to the IOP */
864 u->first_time = 1;
865 }
866 //printf("acn_start_monitor() complete\n"); // fulko
867 }
868
pcap_inject_acn(pcap_t * p,const void * buf _U_,size_t size _U_)869 static int pcap_inject_acn(pcap_t *p, const void *buf _U_, size_t size _U_) {
870 strlcpy(p->errbuf, "Sending packets isn't supported on ACN adapters",
871 PCAP_ERRBUF_SIZE);
872 return (-1);
873 }
874
pcap_setfilter_acn(pcap_t * handle,struct bpf_program * bpf)875 static int pcap_setfilter_acn(pcap_t *handle, struct bpf_program *bpf) {
876 int fd = handle->fd;
877 int count;
878 struct bpf_insn *p;
879 uint16_t shortInt;
880 uint32_t longInt;
881
882 send_to_fd(fd, 1, (unsigned char *)"F"); /* BPF filter follows command */
883 count = bpf->bf_len;
884 longInt = htonl(count);
885 send_to_fd(fd, 4, (unsigned char *)&longInt); /* send the instruction sequence count */
886 p = bpf->bf_insns;
887 while (count--) { /* followed by the list of instructions */
888 shortInt = htons(p->code);
889 longInt = htonl(p->k);
890 send_to_fd(fd, 2, (unsigned char *)&shortInt);
891 send_to_fd(fd, 1, (unsigned char *)&p->jt);
892 send_to_fd(fd, 1, (unsigned char *)&p->jf);
893 send_to_fd(fd, 4, (unsigned char *)&longInt);
894 p++;
895 }
896 if (get_error_response(fd, NULL))
897 return -1;
898 return 0;
899 }
900
pcap_setdirection_acn(pcap_t * handle,pcap_direction_t d)901 static int pcap_setdirection_acn(pcap_t *handle, pcap_direction_t d) {
902 pcap_snprintf(handle->errbuf, sizeof(handle->errbuf),
903 "Setting direction is not supported on ACN adapters");
904 return -1;
905 }
906
acn_read_n_bytes_with_timeout(pcap_t * handle,int count)907 static int acn_read_n_bytes_with_timeout(pcap_t *handle, int count) {
908 struct timeval tv;
909 int retval, fd;
910 fd_set r_fds;
911 fd_set w_fds;
912 u_char *bp;
913 int len = 0;
914 int offset = 0;
915
916 tv.tv_sec = 5;
917 tv.tv_usec = 0;
918
919 fd = handle->fd;
920 FD_ZERO(&r_fds);
921 FD_SET(fd, &r_fds);
922 memcpy(&w_fds, &r_fds, sizeof(r_fds));
923 bp = handle->bp;
924 while (count) {
925 retval = select(fd + 1, &w_fds, NULL, NULL, &tv);
926 if (retval == -1) { /* an error occured !!!!! */
927 // fprintf(stderr, "error during packet data read\n");
928 return -1; /* but we need to return a good indication to prevent unneccessary popups */
929 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */
930 // fprintf(stderr, "timeout during packet data read\n");
931 return -1;
932 } else {
933 if ((len = recv(fd, (bp + offset), count, 0)) <= 0) {
934 // fprintf(stderr, "premature exit during packet data rx\n");
935 return -1;
936 }
937 count -= len;
938 offset += len;
939 }
940 }
941 return 0;
942 }
943
pcap_read_acn(pcap_t * handle,int max_packets,pcap_handler callback,u_char * user)944 static int pcap_read_acn(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) {
945 #define HEADER_SIZE (4 * 4)
946 unsigned char packet_header[HEADER_SIZE];
947 struct pcap_pkthdr pcap_header;
948
949 //printf("pcap_read_acn()\n"); // fulko
950 acn_start_monitor(handle->fd, handle->snapshot, handle->opt.timeout, handle->opt.promisc, handle->direction); /* maybe tell him to start monitoring */
951 //printf("pcap_read_acn() after start monitor\n"); // fulko
952
953 handle->bp = packet_header;
954 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 */
955
956 pcap_header.ts.tv_sec = ntohl(*(uint32_t *)&packet_header[0]); /* tv_sec */
957 pcap_header.ts.tv_usec = ntohl(*(uint32_t *)&packet_header[4]); /* tv_usec */
958 pcap_header.caplen = ntohl(*(uint32_t *)&packet_header[8]); /* caplen */
959 pcap_header.len = ntohl(*(uint32_t *)&packet_header[12]); /* len */
960
961 handle->bp = (u_char *)handle->buffer + handle->offset; /* start off the receive pointer at the right spot */
962 if (acn_read_n_bytes_with_timeout(handle, pcap_header.caplen) == -1) return 0; /* then try to read in the rest of the data */
963
964 callback(user, &pcap_header, handle->bp); /* call the user supplied callback function */
965 return 1;
966 }
967
pcap_activate_sita(pcap_t * handle)968 static int pcap_activate_sita(pcap_t *handle) {
969 int fd;
970
971 if (handle->opt.rfmon) {
972 /*
973 * No monitor mode on SITA devices (they're not Wi-Fi
974 * devices).
975 */
976 return PCAP_ERROR_RFMON_NOTSUP;
977 }
978
979 /* Initialize some components of the pcap structure. */
980
981 handle->inject_op = pcap_inject_acn;
982 handle->setfilter_op = pcap_setfilter_acn;
983 handle->setdirection_op = pcap_setdirection_acn;
984 handle->set_datalink_op = NULL; /* can't change data link type */
985 handle->getnonblock_op = pcap_getnonblock_fd;
986 handle->setnonblock_op = pcap_setnonblock_fd;
987 handle->cleanup_op = pcap_cleanup_acn;
988 handle->read_op = pcap_read_acn;
989 handle->stats_op = pcap_stats_acn;
990
991 fd = acn_open_live(handle->opt.device, handle->errbuf,
992 &handle->linktype);
993 if (fd == -1)
994 return PCAP_ERROR;
995 handle->fd = fd;
996 handle->bufsize = handle->snapshot;
997
998 /* Allocate the buffer */
999
1000 handle->buffer = malloc(handle->bufsize + handle->offset);
1001 if (!handle->buffer) {
1002 pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
1003 "malloc: %s", pcap_strerror(errno));
1004 pcap_cleanup_acn(handle);
1005 return PCAP_ERROR;
1006 }
1007
1008 /*
1009 * "handle->fd" is a socket, so "select()" and "poll()"
1010 * should work on it.
1011 */
1012 handle->selectable_fd = handle->fd;
1013
1014 return 0;
1015 }
1016
pcap_create_interface(const char * device _U_,char * ebuf)1017 pcap_t *pcap_create_interface(const char *device _U_, char *ebuf) {
1018 pcap_t *p;
1019
1020 p = pcap_create_common(ebuf, 0);
1021 if (p == NULL)
1022 return (NULL);
1023
1024 p->activate_op = pcap_activate_sita;
1025 return (p);
1026 }
1027
pcap_platform_finddevs(pcap_if_t ** alldevsp,char * errbuf)1028 int pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf) {
1029
1030 //printf("pcap_findalldevs()\n"); // fulko
1031
1032 *alldevsp = 0; /* initialize the returned variables before we do anything */
1033 strcpy(errbuf, "");
1034 if (acn_parse_hosts_file(errbuf)) /* scan the hosts file for potential IOPs */
1035 {
1036 //printf("pcap_findalldevs() returning BAD after parsehosts\n"); // fulko
1037 return -1;
1038 }
1039 //printf("pcap_findalldevs() got hostlist now finding devs\n"); // fulko
1040 if (acn_findalldevs(errbuf)) /* then ask the IOPs for their monitorable devices */
1041 {
1042 //printf("pcap_findalldevs() returning BAD after findalldevs\n"); // fulko
1043 return -1;
1044 }
1045 *alldevsp = acn_if_list;
1046 acn_if_list = 0; /* then forget our list head, because someone will call pcap_freealldevs() to empty the malloc'ed stuff */
1047 //printf("pcap_findalldevs() returning ZERO OK\n"); // fulko
1048 return 0;
1049 }
1050