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 (at) sita.aero> 5 * 6 * License: BSD 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 3. The names of the authors may not be used to endorse or promote 19 * products derived from this software without specific prior 20 * written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 25 */ 26 27 #ifdef HAVE_CONFIG_H 28 #include "config.h" 29 #endif 30 31 #include <stdio.h> 32 #include <string.h> 33 #include <stdlib.h> 34 #include <unistd.h> 35 #include <fcntl.h> 36 #include <errno.h> 37 #include <sys/time.h> 38 #include <sys/socket.h> 39 #include <netinet/in.h> 40 #include <arpa/inet.h> 41 #include "pcap-int.h" 42 43 #include "pcap-sita.h" 44 45 /* non-configureable manifests follow */ 46 47 #define IOP_SNIFFER_PORT 49152 /* TCP port on the IOP used for 'distributed pcap' usage */ 48 #define MAX_LINE_SIZE 255 /* max size of a buffer/line in /etc/hosts we allow */ 49 #define MAX_CHASSIS 8 /* number of chassis in an ACN site */ 50 #define MAX_GEOSLOT 8 /* max number of access units in an ACN site */ 51 52 #define FIND 0 53 #define LIVE 1 54 55 typedef struct iface { 56 struct iface *next; /* a pointer to the next interface */ 57 char *name; /* this interface's name */ 58 char *IOPname; /* this interface's name on an IOP */ 59 uint32_t iftype; /* the type of interface (DLT values) */ 60 } iface_t; 61 62 typedef struct unit { 63 char *ip; /* this unit's IP address (as extracted from /etc/hosts) */ 64 int fd; /* the connection to this unit (if it exists) */ 65 int find_fd; /* a big kludge to avoid my programming limitations since I could have this unit open for findalldevs purposes */ 66 int first_time; /* 0 = just opened via acn_open_live(), ie. the first time, NZ = nth time */ 67 struct sockaddr_in *serv_addr; /* the address control block for comms to this unit */ 68 int chassis; 69 int geoslot; 70 iface_t *iface; /* a pointer to a linked list of interface structures */ 71 char *imsg; /* a pointer to an inbound message */ 72 int len; /* the current size of the inbound message */ 73 } unit_t; 74 75 static unit_t units[MAX_CHASSIS+1][MAX_GEOSLOT+1]; /* we use indexes of 1 through 8, but we reserve/waste index 0 */ 76 static fd_set readfds; /* a place to store the file descriptors for the connections to the IOPs */ 77 static int max_fs; 78 79 pcap_if_t *acn_if_list; /* pcap's list of available interfaces */ 80 81 static void dump_interface_list(void) { 82 pcap_if_t *iff; 83 pcap_addr_t *addr; 84 int longest_name_len = 0; 85 char *n, *d, *f; 86 int if_number = 0; 87 88 iff = acn_if_list; 89 while (iff) { 90 if (iff->name && (strlen(iff->name) > longest_name_len)) longest_name_len = strlen(iff->name); 91 iff = iff->next; 92 } 93 iff = acn_if_list; 94 printf("Interface List:\n"); 95 while (iff) { 96 n = (iff->name) ? iff->name : ""; 97 d = (iff->description) ? iff->description : ""; 98 f = (iff->flags == PCAP_IF_LOOPBACK) ? "L" : ""; 99 printf("%3d: %*s %s '%s'\n", if_number++, longest_name_len, n, f, d); 100 addr = iff->addresses; 101 while (addr) { 102 printf("%*s ", (5 + longest_name_len), ""); /* add some indentation */ 103 printf("%15s ", (addr->addr) ? inet_ntoa(((struct sockaddr_in *)addr->addr)->sin_addr) : ""); 104 printf("%15s ", (addr->netmask) ? inet_ntoa(((struct sockaddr_in *)addr->netmask)->sin_addr) : ""); 105 printf("%15s ", (addr->broadaddr) ? inet_ntoa(((struct sockaddr_in *)addr->broadaddr)->sin_addr) : ""); 106 printf("%15s ", (addr->dstaddr) ? inet_ntoa(((struct sockaddr_in *)addr->dstaddr)->sin_addr) : ""); 107 printf("\n"); 108 addr = addr->next; 109 } 110 iff = iff->next; 111 } 112 } 113 114 static void dump(unsigned char *ptr, int i, int indent) { 115 fprintf(stderr, "%*s", indent, " "); 116 for (; i > 0; i--) { 117 fprintf(stderr, "%2.2x ", *ptr++); 118 } 119 fprintf(stderr, "\n"); 120 } 121 122 static void dump_interface_list_p(void) { 123 pcap_if_t *iff; 124 pcap_addr_t *addr; 125 int if_number = 0; 126 127 iff = acn_if_list; 128 printf("Interface Pointer @ %p is %p:\n", &acn_if_list, iff); 129 while (iff) { 130 printf("%3d: %p %p next: %p\n", if_number++, iff->name, iff->description, iff->next); 131 dump((unsigned char *)iff, sizeof(pcap_if_t), 5); 132 addr = iff->addresses; 133 while (addr) { 134 printf(" %p %p %p %p, next: %p\n", addr->addr, addr->netmask, addr->broadaddr, addr->dstaddr, addr->next); 135 dump((unsigned char *)addr, sizeof(pcap_addr_t), 10); 136 addr = addr->next; 137 } 138 iff = iff->next; 139 } 140 } 141 142 static void dump_unit_table(void) { 143 int chassis, geoslot; 144 iface_t *p; 145 146 printf("%c:%c %s %s\n", 'C', 'S', "fd", "IP Address"); 147 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { 148 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 149 if (units[chassis][geoslot].ip != NULL) 150 printf("%d:%d %2d %s\n", chassis, geoslot, units[chassis][geoslot].fd, units[chassis][geoslot].ip); 151 p = units[chassis][geoslot].iface; 152 while (p) { 153 char *n = (p->name) ? p->name : ""; 154 char *i = (p->IOPname) ? p->IOPname : ""; 155 p = p->next; 156 printf(" %12s -> %12s\n", i, n); 157 } 158 } 159 } 160 } 161 162 static int find_unit_by_fd(int fd, int *chassis, int *geoslot, unit_t **unit_ptr) { 163 int c, s; 164 165 for (c = 0; c <= MAX_CHASSIS; c++) { 166 for (s = 0; s <= MAX_GEOSLOT; s++) { 167 if (units[c][s].fd == fd || units[c][s].find_fd == fd) { 168 if (chassis) *chassis = c; 169 if (geoslot) *geoslot = s; 170 if (unit_ptr) *unit_ptr = &units[c][s]; 171 return 1; 172 } 173 } 174 } 175 return 0; 176 } 177 178 static int read_client_nbytes(int fd, int count, unsigned char *buf) { 179 unit_t *u; 180 int chassis, geoslot; 181 int len; 182 183 find_unit_by_fd(fd, &chassis, &geoslot, &u); 184 while (count) { 185 if ((len = recv(fd, buf, count, 0)) <= 0) return -1; /* read in whatever data was sent to us */ 186 count -= len; 187 buf += len; 188 } /* till we have everything we are looking for */ 189 return 0; 190 } 191 192 static void empty_unit_iface(unit_t *u) { 193 iface_t *p, *cur; 194 195 cur = u->iface; 196 while (cur) { /* loop over all the interface entries */ 197 if (cur->name) free(cur->name); /* throwing away the contents if they exist */ 198 if (cur->IOPname) free(cur->IOPname); 199 p = cur->next; 200 free(cur); /* then throw away the structure itself */ 201 cur = p; 202 } 203 u->iface = 0; /* and finally remember that there are no remaining structure */ 204 } 205 206 static void empty_unit(int chassis, int geoslot) { 207 unit_t *u = &units[chassis][geoslot]; 208 209 empty_unit_iface(u); 210 if (u->imsg) { /* then if an inbound message buffer exists */ 211 void *bigger_buffer; 212 213 bigger_buffer = (char *)realloc(u->imsg, 1); /* and re-allocate the old large buffer into a new small one */ 214 if (bigger_buffer == NULL) { /* oops, realloc call failed */ 215 fprintf(stderr, "Warning...call to realloc() failed, value of errno is %d\n", errno); 216 return; 217 } 218 u->imsg = bigger_buffer; 219 } 220 } 221 222 static void empty_unit_table(void) { 223 int chassis, geoslot; 224 225 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { 226 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 227 if (units[chassis][geoslot].ip != NULL) { 228 free(units[chassis][geoslot].ip); /* get rid of the malloc'ed space that holds the IP address */ 229 units[chassis][geoslot].ip = 0; /* then set the pointer to NULL */ 230 } 231 empty_unit(chassis, geoslot); 232 } 233 } 234 } 235 236 static char *find_nth_interface_name(int n) { 237 int chassis, geoslot; 238 iface_t *p; 239 char *last_name = 0; 240 241 if (n < 0) n = 0; /* ensure we are working with a valid number */ 242 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */ 243 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 244 if (units[chassis][geoslot].ip != NULL) { 245 p = units[chassis][geoslot].iface; 246 while (p) { /* and all interfaces... */ 247 if (p->IOPname) last_name = p->name; /* remembering the last name found */ 248 if (n-- == 0) return last_name; /* and if we hit the instance requested */ 249 p = p->next; 250 } 251 } 252 } 253 } 254 /* if we couldn't fine the selected entry */ 255 if (last_name) return last_name; /* ... but we did have at least one entry... return the last entry found */ 256 return ""; /* ... but if there wasn't any entry... return an empty string instead */ 257 } 258 259 int acn_parse_hosts_file(char *errbuf) { /* returns: -1 = error, 0 = OK */ 260 FILE *fp; 261 char buf[MAX_LINE_SIZE]; 262 char *ptr, *ptr2; 263 int pos; 264 int chassis, geoslot; 265 unit_t *u; 266 267 empty_unit_table(); 268 if ((fp = fopen("/etc/hosts", "r")) == NULL) { /* try to open the hosts file and if it fails */ 269 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot open '/etc/hosts' for reading."); /* return the nohostsfile error response */ 270 return -1; 271 } 272 while (fgets(buf, MAX_LINE_SIZE-1, fp)) { /* while looping over the file */ 273 274 pos = strcspn(buf, "#\n\r"); /* find the first comment character or EOL */ 275 *(buf + pos) = '\0'; /* and clobber it and anything that follows it */ 276 277 pos = strspn(buf, " \t"); /* then find the first non-white space */ 278 if (pos == strlen(buf)) /* if there is nothing but white space on the line */ 279 continue; /* ignore that empty line */ 280 ptr = buf + pos; /* and skip over any of that leading whitespace */ 281 282 if ((ptr2 = strstr(ptr, "_I_")) == NULL) /* skip any lines that don't have names that look like they belong to IOPs */ 283 continue; 284 if (*(ptr2 + 4) != '_') /* and skip other lines that have names that don't look like ACN components */ 285 continue; 286 *(ptr + strcspn(ptr, " \t")) = '\0'; /* null terminate the IP address so its a standalone string */ 287 288 chassis = *(ptr2 + 3) - '0'; /* extract the chassis number */ 289 geoslot = *(ptr2 + 5) - '0'; /* and geo-slot number */ 290 if (chassis < 1 || chassis > MAX_CHASSIS || 291 geoslot < 1 || geoslot > MAX_GEOSLOT) { /* if the chassis and/or slot numbers appear to be bad... */ 292 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "Invalid ACN name in '/etc/hosts'."); /* warn the user */ 293 continue; /* and ignore the entry */ 294 } 295 if ((ptr2 = (char *)malloc(strlen(ptr) + 1)) == NULL) { 296 pcap_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 } 309 310 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 } 344 345 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 } 356 357 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 } 368 369 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 } 385 386 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 } 406 407 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 } 411 412 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 } 418 419 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 } 500 501 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 } 527 528 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 } 563 564 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 } 702 703 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 } 719 720 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 } 758 759 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 } 775 776 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 } 805 806 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 } 819 820 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 } 849 850 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 } 868 869 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 } 874 875 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 } 900 901 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 } 906 907 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 } 943 944 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 } 967 968 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 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 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
