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 /* $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 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 } 115 116 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 } 123 124 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 } 143 144 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 } 163 164 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 } 179 180 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 } 193 194 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 } 207 208 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
