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 55typedef 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 62typedef 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 75static unit_t units[MAX_CHASSIS+1][MAX_GEOSLOT+1]; /* we use indexes of 1 through 8, but we reserve/waste index 0 */ 76static fd_set readfds; /* a place to store the file descriptors for the connections to the IOPs */ 77static int max_fs; 78 79pcap_if_t *acn_if_list; /* pcap's list of available interfaces */ 80 81static 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 114static 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 122static 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 142static 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 162static 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 178static 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 192static 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 206static 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 u->imsg = (char *)realloc(u->imsg, 1); /* and re-allocate the old large buffer into a new small one */ 212 if (u->imsg == NULL) { /* oops, realloc call failed */ 213 fprintf(stderr, "Warning...call to realloc() failed, value of errno is %d\n", errno); 214 215 } 216} 217 218static void empty_unit_table(void) { 219 int chassis, geoslot; 220 221 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { 222 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 223 if (units[chassis][geoslot].ip != NULL) { 224 free(units[chassis][geoslot].ip); /* get rid of the malloc'ed space that holds the IP address */ 225 units[chassis][geoslot].ip = 0; /* then set the pointer to NULL */ 226 } 227 empty_unit(chassis, geoslot); 228 } 229 } 230} 231 232static char *find_nth_interface_name(int n) { 233 int chassis, geoslot; 234 iface_t *p; 235 char *last_name = 0; 236 237 if (n < 0) n = 0; /* ensure we are working with a valid number */ 238 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */ 239 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 240 if (units[chassis][geoslot].ip != NULL) { 241 p = units[chassis][geoslot].iface; 242 while (p) { /* and all interfaces... */ 243 if (p->IOPname) last_name = p->name; /* remembering the last name found */ 244 if (n-- == 0) return last_name; /* and if we hit the instance requested */ 245 p = p->next; 246 } 247 } 248 } 249 } 250 /* if we couldn't fine the selected entry */ 251 if (last_name) return last_name; /* ... but we did have at least one entry... return the last entry found */ 252 return ""; /* ... but if there wasn't any entry... return an empty string instead */ 253} 254 255int acn_parse_hosts_file(char *errbuf) { /* returns: -1 = error, 0 = OK */ 256 FILE *fp; 257 char buf[MAX_LINE_SIZE]; 258 char *ptr, *ptr2; 259 int pos; 260 int chassis, geoslot; 261 unit_t *u; 262 263 empty_unit_table(); 264 if ((fp = fopen("/etc/hosts", "r")) == NULL) { /* try to open the hosts file and if it fails */ 265 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot open '/etc/hosts' for reading."); /* return the nohostsfile error response */ 266 return -1; 267 } 268 while (fgets(buf, MAX_LINE_SIZE-1, fp)) { /* while looping over the file */ 269 270 pos = strcspn(buf, "#\n\r"); /* find the first comment character or EOL */ 271 *(buf + pos) = '\0'; /* and clobber it and anything that follows it */ 272 273 pos = strspn(buf, " \t"); /* then find the first non-white space */ 274 if (pos == strlen(buf)) /* if there is nothing but white space on the line */ 275 continue; /* ignore that empty line */ 276 ptr = buf + pos; /* and skip over any of that leading whitespace */ 277 278 if ((ptr2 = strstr(ptr, "_I_")) == NULL) /* skip any lines that don't have names that look like they belong to IOPs */ 279 continue; 280 if (*(ptr2 + 4) != '_') /* and skip other lines that have names that don't look like ACN components */ 281 continue; 282 *(ptr + strcspn(ptr, " \t")) = '\0'; /* null terminate the IP address so its a standalone string */ 283 284 chassis = *(ptr2 + 3) - '0'; /* extract the chassis number */ 285 geoslot = *(ptr2 + 5) - '0'; /* and geo-slot number */ 286 if (chassis < 1 || chassis > MAX_CHASSIS || 287 geoslot < 1 || geoslot > MAX_GEOSLOT) { /* if the chassis and/or slot numbers appear to be bad... */ 288 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Invalid ACN name in '/etc/hosts'."); /* warn the user */ 289 continue; /* and ignore the entry */ 290 } 291 if ((ptr2 = (char *)malloc(strlen(ptr) + 1)) == NULL) { 292 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 293 continue; 294 } 295 strcpy(ptr2, ptr); /* copy the IP address into our malloc'ed memory */ 296 u = &units[chassis][geoslot]; 297 u->ip = ptr2; /* and remember the whole shebang */ 298 u->chassis = chassis; 299 u->geoslot = geoslot; 300 } 301 fclose(fp); 302 if (*errbuf) return -1; 303 else return 0; 304} 305 306static int open_with_IOP(unit_t *u, int flag) { 307 int sockfd; 308 char *ip; 309 310 if (u->serv_addr == NULL) { 311 u->serv_addr = malloc(sizeof(struct sockaddr_in)); 312 313 /* since we called malloc(), lets check to see if we actually got the memory */ 314 if (u->serv_addr == NULL) { /* oops, we didn't get the memory requested */ 315 fprintf(stderr, "malloc() request for u->serv_addr failed, value of errno is: %d\n", errno); 316 return 0; 317 } 318 319 } 320 ip = u->ip; 321 /* bzero() is deprecated, replaced with memset() */ 322 memset((char *)u->serv_addr, 0, sizeof(struct sockaddr_in)); 323 u->serv_addr->sin_family = AF_INET; 324 u->serv_addr->sin_addr.s_addr = inet_addr(ip); 325 u->serv_addr->sin_port = htons(IOP_SNIFFER_PORT); 326 327 if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { 328 fprintf(stderr, "pcap can't open a socket for connecting to IOP at %s\n", ip); 329 return 0; 330 } 331 if (connect(sockfd, (struct sockaddr *)u->serv_addr, sizeof(struct sockaddr_in)) < 0) { 332 fprintf(stderr, "pcap can't connect to IOP at %s\n", ip); 333 return 0; 334 } 335 if (flag == LIVE) u->fd = sockfd; 336 else u->find_fd = sockfd; 337 u->first_time = 0; 338 return sockfd; /* return the non-zero file descriptor as a 'success' indicator */ 339} 340 341static void close_with_IOP(int chassis, int geoslot, int flag) { 342 int *id; 343 344 if (flag == LIVE) id = &units[chassis][geoslot].fd; 345 else id = &units[chassis][geoslot].find_fd; 346 347 if (*id) { /* this was the last time, so... if we are connected... */ 348 close(*id); /* disconnect us */ 349 *id = 0; /* and forget that the descriptor exists because we are not open */ 350 } 351} 352 353static void pcap_cleanup_acn(pcap_t *handle) { 354 int chassis, geoslot; 355 unit_t *u; 356 357 if (find_unit_by_fd(handle->fd, &chassis, &geoslot, &u) == 0) 358 return; 359 close_with_IOP(chassis, geoslot, LIVE); 360 if (u) 361 u->first_time = 0; 362 pcap_cleanup_live_common(handle); 363} 364 365static void send_to_fd(int fd, int len, unsigned char *str) { 366 int nwritten; 367 int chassis, geoslot; 368 369 while (len > 0) { 370 if ((nwritten = write(fd, str, len)) <= 0) { 371 find_unit_by_fd(fd, &chassis, &geoslot, NULL); 372 if (units[chassis][geoslot].fd == fd) close_with_IOP(chassis, geoslot, LIVE); 373 else if (units[chassis][geoslot].find_fd == fd) close_with_IOP(chassis, geoslot, FIND); 374 empty_unit(chassis, geoslot); 375 return; 376 } 377 len -= nwritten; 378 str += nwritten; 379 } 380} 381 382static void acn_freealldevs(void) { 383 384 pcap_if_t *iff, *next_iff; 385 pcap_addr_t *addr, *next_addr; 386 387 for (iff = acn_if_list; iff != NULL; iff = next_iff) { 388 next_iff = iff->next; 389 for (addr = iff->addresses; addr != NULL; addr = next_addr) { 390 next_addr = addr->next; 391 if (addr->addr) free(addr->addr); 392 if (addr->netmask) free(addr->netmask); 393 if (addr->broadaddr) free(addr->broadaddr); 394 if (addr->dstaddr) free(addr->dstaddr); 395 free(addr); 396 } 397 if (iff->name) free(iff->name); 398 if (iff->description) free(iff->description); 399 free(iff); 400 } 401} 402 403static void nonUnified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u) { 404 405 snprintf(buf, bufsize, "%s_%d_%d", proto, u->chassis, u->geoslot); 406} 407 408static void unified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u, int IOPportnum) { 409 int portnum; 410 411 portnum = ((u->chassis - 1) * 64) + ((u->geoslot - 1) * 8) + IOPportnum + 1; 412 snprintf(buf, bufsize, "%s_%d", proto, portnum); 413} 414 415static char *translate_IOP_to_pcap_name(unit_t *u, char *IOPname, bpf_u_int32 iftype) { 416 iface_t *iface_ptr, *iface; 417 char *name; 418 char buf[32]; 419 char *proto; 420 char *port; 421 int IOPportnum = 0; 422 423 iface = malloc(sizeof(iface_t)); /* get memory for a structure */ 424 if (iface == NULL) { /* oops, we didn't get the memory requested */ 425 fprintf(stderr, "Error...couldn't allocate memory for interface structure...value of errno is: %d\n", errno); 426 return NULL; 427 } 428 memset((char *)iface, 0, sizeof(iface_t)); /* bzero is deprecated(), replaced with memset() */ 429 430 iface->iftype = iftype; /* remember the interface type of this interface */ 431 432 name = malloc(strlen(IOPname) + 1); /* get memory for the IOP's name */ 433 if (name == NULL) { /* oops, we didn't get the memory requested */ 434 fprintf(stderr, "Error...couldn't allocate memory for IOPname...value of errno is: %d\n", errno); 435 return NULL; 436 } 437 438 strcpy(name, IOPname); /* and copy it in */ 439 iface->IOPname = name; /* and stick it into the structure */ 440 441 if (strncmp(IOPname, "lo", 2) == 0) { 442 IOPportnum = atoi(&IOPname[2]); 443 switch (iftype) { 444 case DLT_EN10MB: 445 nonUnified_IOP_port_name(buf, sizeof buf, "lo", u); 446 break; 447 default: 448 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum); 449 break; 450 } 451 } else if (strncmp(IOPname, "eth", 3) == 0) { 452 IOPportnum = atoi(&IOPname[3]); 453 switch (iftype) { 454 case DLT_EN10MB: 455 nonUnified_IOP_port_name(buf, sizeof buf, "eth", u); 456 break; 457 default: 458 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum); 459 break; 460 } 461 } else if (strncmp(IOPname, "wan", 3) == 0) { 462 IOPportnum = atoi(&IOPname[3]); 463 switch (iftype) { 464 case DLT_SITA: 465 unified_IOP_port_name(buf, sizeof buf, "wan", u, IOPportnum); 466 break; 467 default: 468 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum); 469 break; 470 } 471 } else { 472 fprintf(stderr, "Error... invalid IOP name %s\n", IOPname); 473 return NULL; 474 } 475 476 name = malloc(strlen(buf) + 1); /* get memory for that name */ 477 if (name == NULL) { /* oops, we didn't get the memory requested */ 478 fprintf(stderr, "Error...couldn't allocate memory for IOP port name...value of errno is: %d\n", errno); 479 return NULL; 480 } 481 482 strcpy(name, buf); /* and copy it in */ 483 iface->name = name; /* and stick it into the structure */ 484 485 if (u->iface == 0) { /* if this is the first name */ 486 u->iface = iface; /* stick this entry at the head of the list */ 487 } else { 488 iface_ptr = u->iface; 489 while (iface_ptr->next) { /* othewise scan the list */ 490 iface_ptr = iface_ptr->next; /* till we're at the last entry */ 491 } 492 iface_ptr->next = iface; /* then tack this entry on the end of the list */ 493 } 494 return iface->name; 495} 496 497static int if_sort(char *s1, char *s2) { 498 char *s1_p2, *s2_p2; 499 char str1[MAX_LINE_SIZE], str2[MAX_LINE_SIZE]; 500 int s1_p1_len, s2_p1_len; 501 int retval; 502 503 if ((s1_p2 = strchr(s1, '_'))) { /* if an underscore is found... */ 504 s1_p1_len = s1_p2 - s1; /* the prefix length is the difference in pointers */ 505 s1_p2++; /* the suffix actually starts _after_ the underscore */ 506 } else { /* otherwise... */ 507 s1_p1_len = strlen(s1); /* the prefix length is the length of the string itself */ 508 s1_p2 = 0; /* and there is no suffix */ 509 } 510 if ((s2_p2 = strchr(s2, '_'))) { /* now do the same for the second string */ 511 s2_p1_len = s2_p2 - s2; 512 s2_p2++; 513 } else { 514 s2_p1_len = strlen(s2); 515 s2_p2 = 0; 516 } 517 strncpy(str1, s1, (s1_p1_len > sizeof(str1)) ? s1_p1_len : sizeof(str1)); *(str1 + s1_p1_len) = 0; 518 strncpy(str2, s2, (s2_p1_len > sizeof(str2)) ? s2_p1_len : sizeof(str2)); *(str2 + s2_p1_len) = 0; 519 retval = strcmp(str1, str2); 520 if (retval != 0) return retval; /* if they are not identical, then we can quit now and return the indication */ 521 return strcmp(s1_p2, s2_p2); /* otherwise we return the result of comparing the 2nd half of the string */ 522} 523 524static void sort_if_table(void) { 525 pcap_if_t *p1, *p2, *prev, *temp; 526 int has_swapped; 527 528 if (!acn_if_list) return; /* nothing to do if the list is empty */ 529 530 while (1) { 531 p1 = acn_if_list; /* start at the head of the list */ 532 prev = 0; 533 has_swapped = 0; 534 while ((p2 = p1->next)) { 535 if (if_sort(p1->name, p2->name) > 0) { 536 if (prev) { /* we are swapping things that are _not_ at the head of the list */ 537 temp = p2->next; 538 prev->next = p2; 539 p2->next = p1; 540 p1->next = temp; 541 } else { /* special treatment if we are swapping with the head of the list */ 542 temp = p2->next; 543 acn_if_list= p2; 544 p2->next = p1; 545 p1->next = temp; 546 } 547 p1 = p2; 548 prev = p1; 549 has_swapped = 1; 550 } 551 prev = p1; 552 p1 = p1->next; 553 } 554 if (has_swapped == 0) 555 return; 556 } 557 return; 558} 559 560static int process_client_data (char *errbuf) { /* returns: -1 = error, 0 = OK */ 561 int chassis, geoslot; 562 unit_t *u; 563 pcap_if_t *iff, *prev_iff; 564 pcap_addr_t *addr, *prev_addr; 565 char *ptr; 566 int address_count; 567 struct sockaddr_in *s; 568 char *newname; 569 bpf_u_int32 interfaceType; 570 unsigned char flags; 571 572 prev_iff = 0; 573 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { 574 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { /* now loop over all the devices */ 575 u = &units[chassis][geoslot]; 576 empty_unit_iface(u); 577 ptr = u->imsg; /* point to the start of the msg for this IOP */ 578 while (ptr < (u->imsg + u->len)) { 579 if ((iff = malloc(sizeof(pcap_if_t))) == NULL) { 580 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 581 return -1; 582 } 583 memset((char *)iff, 0, sizeof(pcap_if_t)); /* bzero() is deprecated, replaced with memset() */ 584 if (acn_if_list == 0) acn_if_list = iff; /* remember the head of the list */ 585 if (prev_iff) prev_iff->next = iff; /* insert a forward link */ 586 587 if (*ptr) { /* if there is a count for the name */ 588 if ((iff->name = malloc(*ptr + 1)) == NULL) { /* get that amount of space */ 589 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 590 return -1; 591 } 592 memcpy(iff->name, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */ 593 *(iff->name + *ptr) = 0; /* and null terminate the string */ 594 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */ 595 } 596 ptr++; 597 598 if (*ptr) { /* if there is a count for the description */ 599 if ((iff->description = malloc(*ptr + 1)) == NULL) { /* get that amount of space */ 600 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 601 return -1; 602 } 603 memcpy(iff->description, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */ 604 *(iff->description + *ptr) = 0; /* and null terminate the string */ 605 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */ 606 } 607 ptr++; 608 609 interfaceType = ntohl(*(bpf_u_int32 *)ptr); 610 ptr += 4; /* skip over the interface type */ 611 612 flags = *ptr++; 613 if (flags) iff->flags = PCAP_IF_LOOPBACK; /* if this is a loopback style interface, lets mark it as such */ 614 615 address_count = *ptr++; 616 617 prev_addr = 0; 618 while (address_count--) { 619 if ((addr = malloc(sizeof(pcap_addr_t))) == NULL) { 620 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 621 return -1; 622 } 623+ memset((char *)addr, 0, sizeof(pcap_addr_t)); /* bzero() is deprecated, replaced with memset() */ 624 if (iff->addresses == 0) iff->addresses = addr; 625 if (prev_addr) prev_addr->next = addr; /* insert a forward link */ 626 if (*ptr) { /* if there is a count for the address */ 627 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { /* get that amount of space */ 628 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 629 return -1; 630 } 631 memset((char *)s, 0, sizeof(struct sockaddr_in)); /* bzero() is deprecated, replaced with memset() */ 632 addr->addr = (struct sockaddr *)s; 633 s->sin_family = AF_INET; 634 s->sin_addr.s_addr = *(bpf_u_int32 *)(ptr + 1); /* copy the address in */ 635 ptr += *ptr; /* now move the pointer forwards according to the specified length of the address */ 636 } 637 ptr++; /* then forwards one more for the 'length of the address' field */ 638 if (*ptr) { /* process any netmask */ 639 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { 640 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 641 return -1; 642 } 643 /* bzero() is deprecated, replaced with memset() */ 644 memset((char *)s, 0, sizeof(struct sockaddr_in)); 645 646 addr->netmask = (struct sockaddr *)s; 647 s->sin_family = AF_INET; 648 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1); 649 ptr += *ptr; 650 } 651 ptr++; 652 if (*ptr) { /* process any broadcast address */ 653 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { 654 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 655 return -1; 656 } 657 /* bzero() is deprecated, replaced with memset() */ 658 memset((char *)s, 0, sizeof(struct sockaddr_in)); 659 660 addr->broadaddr = (struct sockaddr *)s; 661 s->sin_family = AF_INET; 662 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1); 663 ptr += *ptr; 664 } 665 ptr++; 666 if (*ptr) { /* process any destination address */ 667 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { 668 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 669 return -1; 670 } 671 /* bzero() is deprecated, replaced with memset() */ 672 memset((char *)s, 0, sizeof(struct sockaddr_in)); 673 674 addr->dstaddr = (struct sockaddr *)s; 675 s->sin_family = AF_INET; 676 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1); 677 ptr += *ptr; 678 } 679 ptr++; 680 prev_addr = addr; 681 } 682 prev_iff = iff; 683 684 newname = translate_IOP_to_pcap_name(u, iff->name, interfaceType); /* add a translation entry and get a point to the mangled name */ 685 if ((iff->name = realloc(iff->name, strlen(newname) + 1)) == NULL) { /* we now re-write the name stored in the interface list */ 686 snprintf(errbuf, PCAP_ERRBUF_SIZE, "realloc: %s", pcap_strerror(errno)); 687 return -1; 688 } 689 strcpy(iff->name, newname); /* to this new name */ 690 } 691 } 692 } 693 return 0; 694} 695 696static int read_client_data (int fd) { 697 unsigned char buf[256]; 698 int chassis, geoslot; 699 unit_t *u; 700 int len; 701 702 find_unit_by_fd(fd, &chassis, &geoslot, &u); 703 704 if ((len = recv(fd, buf, sizeof(buf), 0)) <= 0) return 0; /* read in whatever data was sent to us */ 705 706 if ((u->imsg = realloc(u->imsg, (u->len + len))) == NULL) /* extend the buffer for the new data */ 707 return 0; 708 memcpy((u->imsg + u->len), buf, len); /* append the new data */ 709 u->len += len; 710 return 1; 711} 712 713static void wait_for_all_answers(void) { 714 int retval; 715 struct timeval tv; 716 int fd; 717 int chassis, geoslot; 718 719 tv.tv_sec = 2; 720 tv.tv_usec = 0; 721 722 while (1) { 723 int flag = 0; 724 fd_set working_set; 725 726 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of descriptors we may be listening to */ 727 if (FD_ISSET(fd, &readfds)) flag = 1; /* and see if there are any still set */ 728 } 729 if (flag == 0) return; /* we are done, when they are all gone */ 730 731 memcpy(&working_set, &readfds, sizeof(readfds)); /* otherwise, we still have to listen for more stuff, till we timeout */ 732 retval = select(max_fs + 1, &working_set, NULL, NULL, &tv); 733 if (retval == -1) { /* an error occured !!!!! */ 734 return; 735 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */ 736 printf("timeout\n"); 737 return; 738 } else { 739 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of things to do, and do them */ 740 if (FD_ISSET(fd, &working_set)) { 741 if (read_client_data(fd) == 0) { /* if the socket has closed */ 742 FD_CLR(fd, &readfds); /* and descriptors we listen to for errors */ 743 find_unit_by_fd(fd, &chassis, &geoslot, NULL); 744 close_with_IOP(chassis, geoslot, FIND); /* and close out connection to him */ 745 } 746 } 747 } 748 } 749 } 750} 751 752static char *get_error_response(int fd, char *errbuf) { /* return a pointer on error, NULL on no error */ 753 char byte; 754 int len = 0; 755 756 while (1) { 757 recv(fd, &byte, 1, 0); /* read another byte in */ 758 if (errbuf && (len++ < PCAP_ERRBUF_SIZE)) { /* and if there is still room in the buffer */ 759 *errbuf++ = byte; /* stick it in */ 760 *errbuf = '\0'; /* ensure the string is null terminated just in case we might exceed the buffer's size */ 761 } 762 if (byte == '\0') { 763 if (len > 1) { return errbuf; } 764 else { return NULL; } 765 } 766 } 767} 768 769int acn_findalldevs(char *errbuf) { /* returns: -1 = error, 0 = OK */ 770 int chassis, geoslot; 771 unit_t *u; 772 773 FD_ZERO(&readfds); 774 max_fs = 0; 775 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { 776 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 777 u = &units[chassis][geoslot]; 778 if (u->ip && (open_with_IOP(u, FIND))) { /* connect to the remote IOP */ 779 send_to_fd(u->find_fd, 1, (unsigned char *)"\0"); 780 if (get_error_response(u->find_fd, errbuf)) 781 close_with_IOP(chassis, geoslot, FIND); 782 else { 783 if (u->find_fd > max_fs) 784 max_fs = u->find_fd; /* remember the highest number currently in use */ 785 FD_SET(u->find_fd, &readfds); /* we are going to want to read this guy's response to */ 786 u->len = 0; 787 send_to_fd(u->find_fd, 1, (unsigned char *)"Q"); /* this interface query request */ 788 } 789 } 790 } 791 } 792 wait_for_all_answers(); 793 if (process_client_data(errbuf)) 794 return -1; 795 sort_if_table(); 796 return 0; 797} 798 799static int pcap_stats_acn(pcap_t *handle, struct pcap_stat *ps) { 800 unsigned char buf[12]; 801 802 send_to_fd(handle->fd, 1, (unsigned char *)"S"); /* send the get_stats command to the IOP */ 803 804 if (read_client_nbytes(handle->fd, sizeof(buf), buf) == -1) return -1; /* try reading the required bytes */ 805 806 ps->ps_recv = ntohl(*(uint32_t *)&buf[0]); /* break the buffer into its three 32 bit components */ 807 ps->ps_drop = ntohl(*(uint32_t *)&buf[4]); 808 ps->ps_ifdrop = ntohl(*(uint32_t *)&buf[8]); 809 810 return 0; 811} 812 813static int acn_open_live(const char *name, char *errbuf, int *linktype) { /* returns 0 on error, else returns the file descriptor */ 814 int chassis, geoslot; 815 unit_t *u; 816 iface_t *p; 817 pcap_if_t *alldevsp; 818 819 pcap_findalldevs_interfaces(&alldevsp, errbuf); 820 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */ 821 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 822 u = &units[chassis][geoslot]; 823 if (u->ip != NULL) { 824 p = u->iface; 825 while (p) { /* and all interfaces... */ 826 if (p->IOPname && p->name && (strcmp(p->name, name) == 0)) { /* and if we found the interface we want... */ 827 *linktype = p->iftype; 828 open_with_IOP(u, LIVE); /* start a connection with that IOP */ 829 send_to_fd(u->fd, strlen(p->IOPname)+1, (unsigned char *)p->IOPname); /* send the IOP's interface name, and a terminating null */ 830 if (get_error_response(u->fd, errbuf)) { 831 return -1; 832 } 833 return u->fd; /* and return that open descriptor */ 834 } 835 p = p->next; 836 } 837 } 838 } 839 } 840 return -1; /* if the interface wasn't found, return an error */ 841} 842 843static void acn_start_monitor(int fd, int snaplen, int timeout, int promiscuous, int direction) { 844 unsigned char buf[8]; 845 unit_t *u; 846 847 //printf("acn_start_monitor()\n"); // fulko 848 find_unit_by_fd(fd, NULL, NULL, &u); 849 if (u->first_time == 0) { 850 buf[0] = 'M'; 851 *(uint32_t *)&buf[1] = htonl(snaplen); 852 buf[5] = timeout; 853 buf[6] = promiscuous; 854 buf[7] = direction; 855 //printf("acn_start_monitor() first time\n"); // fulko 856 send_to_fd(fd, 8, buf); /* send the start monitor command with its parameters to the IOP */ 857 u->first_time = 1; 858 } 859 //printf("acn_start_monitor() complete\n"); // fulko 860} 861 862static int pcap_inject_acn(pcap_t *p, const void *buf _U_, size_t size _U_) { 863 strlcpy(p->errbuf, "Sending packets isn't supported on ACN adapters", 864 PCAP_ERRBUF_SIZE); 865 return (-1); 866} 867 868static int pcap_setfilter_acn(pcap_t *handle, struct bpf_program *bpf) { 869 int fd = handle->fd; 870 int count; 871 struct bpf_insn *p; 872 uint16_t shortInt; 873 uint32_t longInt; 874 875 send_to_fd(fd, 1, (unsigned char *)"F"); /* BPF filter follows command */ 876 count = bpf->bf_len; 877 longInt = htonl(count); 878 send_to_fd(fd, 4, (unsigned char *)&longInt); /* send the instruction sequence count */ 879 p = bpf->bf_insns; 880 while (count--) { /* followed by the list of instructions */ 881 shortInt = htons(p->code); 882 longInt = htonl(p->k); 883 send_to_fd(fd, 2, (unsigned char *)&shortInt); 884 send_to_fd(fd, 1, (unsigned char *)&p->jt); 885 send_to_fd(fd, 1, (unsigned char *)&p->jf); 886 send_to_fd(fd, 4, (unsigned char *)&longInt); 887 p++; 888 } 889 if (get_error_response(fd, NULL)) 890 return -1; 891 return 0; 892} 893 894static int pcap_setdirection_acn(pcap_t *handle, pcap_direction_t d) { 895 snprintf(handle->errbuf, sizeof(handle->errbuf), 896 "Setting direction is not supported on ACN adapters"); 897 return -1; 898} 899 900static int acn_read_n_bytes_with_timeout(pcap_t *handle, int count) { 901 struct timeval tv; 902 int retval, fd; 903 fd_set r_fds; 904 fd_set w_fds; 905 u_char *bp; 906 int len = 0; 907 int offset = 0; 908 909 tv.tv_sec = 5; 910 tv.tv_usec = 0; 911 912 fd = handle->fd; 913 FD_ZERO(&r_fds); 914 FD_SET(fd, &r_fds); 915 memcpy(&w_fds, &r_fds, sizeof(r_fds)); 916 bp = handle->bp; 917 while (count) { 918 retval = select(fd + 1, &w_fds, NULL, NULL, &tv); 919 if (retval == -1) { /* an error occured !!!!! */ 920// fprintf(stderr, "error during packet data read\n"); 921 return -1; /* but we need to return a good indication to prevent unneccessary popups */ 922 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */ 923// fprintf(stderr, "timeout during packet data read\n"); 924 return -1; 925 } else { 926 if ((len = recv(fd, (bp + offset), count, 0)) <= 0) { 927// fprintf(stderr, "premature exit during packet data rx\n"); 928 return -1; 929 } 930 count -= len; 931 offset += len; 932 } 933 } 934 return 0; 935} 936 937static int pcap_read_acn(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) { 938 #define HEADER_SIZE (4 * 4) 939 unsigned char packet_header[HEADER_SIZE]; 940 struct pcap_pkthdr pcap_header; 941 942 //printf("pcap_read_acn()\n"); // fulko 943 acn_start_monitor(handle->fd, handle->snapshot, handle->opt.timeout, handle->opt.promisc, handle->direction); /* maybe tell him to start monitoring */ 944 //printf("pcap_read_acn() after start monitor\n"); // fulko 945 946 handle->bp = packet_header; 947 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 */ 948 949 pcap_header.ts.tv_sec = ntohl(*(uint32_t *)&packet_header[0]); /* tv_sec */ 950 pcap_header.ts.tv_usec = ntohl(*(uint32_t *)&packet_header[4]); /* tv_usec */ 951 pcap_header.caplen = ntohl(*(uint32_t *)&packet_header[8]); /* caplen */ 952 pcap_header.len = ntohl(*(uint32_t *)&packet_header[12]); /* len */ 953 954 handle->bp = handle->buffer + handle->offset; /* start off the receive pointer at the right spot */ 955 if (acn_read_n_bytes_with_timeout(handle, pcap_header.caplen) == -1) return 0; /* then try to read in the rest of the data */ 956 957 callback(user, &pcap_header, handle->bp); /* call the user supplied callback function */ 958 return 1; 959} 960 961static int pcap_activate_sita(pcap_t *handle) { 962 int fd; 963 964 if (handle->opt.rfmon) { 965 /* 966 * No monitor mode on SITA devices (they're not Wi-Fi 967 * devices). 968 */ 969 return PCAP_ERROR_RFMON_NOTSUP; 970 } 971 972 /* Initialize some components of the pcap structure. */ 973 974 handle->inject_op = pcap_inject_acn; 975 handle->setfilter_op = pcap_setfilter_acn; 976 handle->setdirection_op = pcap_setdirection_acn; 977 handle->set_datalink_op = NULL; /* can't change data link type */ 978 handle->getnonblock_op = pcap_getnonblock_fd; 979 handle->setnonblock_op = pcap_setnonblock_fd; 980 handle->cleanup_op = pcap_cleanup_acn; 981 handle->read_op = pcap_read_acn; 982 handle->stats_op = pcap_stats_acn; 983 984 fd = acn_open_live(handle->opt.source, handle->errbuf, 985 &handle->linktype); 986 if (fd == -1) 987 return PCAP_ERROR; 988 handle->fd = fd; 989 handle->bufsize = handle->snapshot; 990 991 /* Allocate the buffer */ 992 993 handle->buffer = malloc(handle->bufsize + handle->offset); 994 if (!handle->buffer) { 995 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, 996 "malloc: %s", pcap_strerror(errno)); 997 pcap_cleanup_acn(handle); 998 return PCAP_ERROR; 999 } 1000 1001 /* 1002 * "handle->fd" is a socket, so "select()" and "poll()" 1003 * should work on it. 1004 */ 1005 handle->selectable_fd = handle->fd; 1006 1007 return 0; 1008} 1009 1010pcap_t *pcap_create_interface(const char *device, char *ebuf) { 1011 pcap_t *p; 1012 1013 p = pcap_create_common(device, ebuf, 0); 1014 if (p == NULL) 1015 return (NULL); 1016 1017 p->activate_op = pcap_activate_sita; 1018 return (p); 1019} 1020