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 75/* 76 * Private data. 77 * Currently contains nothing. 78 */ 79struct pcap_sita { 80 int dummy; 81}; 82 83static unit_t units[MAX_CHASSIS+1][MAX_GEOSLOT+1]; /* we use indexes of 1 through 8, but we reserve/waste index 0 */ 84static fd_set readfds; /* a place to store the file descriptors for the connections to the IOPs */ 85static int max_fs; 86 87pcap_if_t *acn_if_list; /* pcap's list of available interfaces */ 88 89static void dump_interface_list(void) { 90 pcap_if_t *iff; 91 pcap_addr_t *addr; 92 int longest_name_len = 0; 93 char *n, *d, *f; 94 int if_number = 0; 95 96 iff = acn_if_list; 97 while (iff) { 98 if (iff->name && (strlen(iff->name) > longest_name_len)) longest_name_len = strlen(iff->name); 99 iff = iff->next; 100 } 101 iff = acn_if_list; 102 printf("Interface List:\n"); 103 while (iff) { 104 n = (iff->name) ? iff->name : ""; 105 d = (iff->description) ? iff->description : ""; 106 f = (iff->flags == PCAP_IF_LOOPBACK) ? "L" : ""; 107 printf("%3d: %*s %s '%s'\n", if_number++, longest_name_len, n, f, d); 108 addr = iff->addresses; 109 while (addr) { 110 printf("%*s ", (5 + longest_name_len), ""); /* add some indentation */ 111 printf("%15s ", (addr->addr) ? inet_ntoa(((struct sockaddr_in *)addr->addr)->sin_addr) : ""); 112 printf("%15s ", (addr->netmask) ? inet_ntoa(((struct sockaddr_in *)addr->netmask)->sin_addr) : ""); 113 printf("%15s ", (addr->broadaddr) ? inet_ntoa(((struct sockaddr_in *)addr->broadaddr)->sin_addr) : ""); 114 printf("%15s ", (addr->dstaddr) ? inet_ntoa(((struct sockaddr_in *)addr->dstaddr)->sin_addr) : ""); 115 printf("\n"); 116 addr = addr->next; 117 } 118 iff = iff->next; 119 } 120} 121 122static void dump(unsigned char *ptr, int i, int indent) { 123 fprintf(stderr, "%*s", indent, " "); 124 for (; i > 0; i--) { 125 fprintf(stderr, "%2.2x ", *ptr++); 126 } 127 fprintf(stderr, "\n"); 128} 129 130static void dump_interface_list_p(void) { 131 pcap_if_t *iff; 132 pcap_addr_t *addr; 133 int if_number = 0; 134 135 iff = acn_if_list; 136 printf("Interface Pointer @ %p is %p:\n", &acn_if_list, iff); 137 while (iff) { 138 printf("%3d: %p %p next: %p\n", if_number++, iff->name, iff->description, iff->next); 139 dump((unsigned char *)iff, sizeof(pcap_if_t), 5); 140 addr = iff->addresses; 141 while (addr) { 142 printf(" %p %p %p %p, next: %p\n", addr->addr, addr->netmask, addr->broadaddr, addr->dstaddr, addr->next); 143 dump((unsigned char *)addr, sizeof(pcap_addr_t), 10); 144 addr = addr->next; 145 } 146 iff = iff->next; 147 } 148} 149 150static void dump_unit_table(void) { 151 int chassis, geoslot; 152 iface_t *p; 153 154 printf("%c:%c %s %s\n", 'C', 'S', "fd", "IP Address"); 155 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { 156 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 157 if (units[chassis][geoslot].ip != NULL) 158 printf("%d:%d %2d %s\n", chassis, geoslot, units[chassis][geoslot].fd, units[chassis][geoslot].ip); 159 p = units[chassis][geoslot].iface; 160 while (p) { 161 char *n = (p->name) ? p->name : ""; 162 char *i = (p->IOPname) ? p->IOPname : ""; 163 p = p->next; 164 printf(" %12s -> %12s\n", i, n); 165 } 166 } 167 } 168} 169 170static int find_unit_by_fd(int fd, int *chassis, int *geoslot, unit_t **unit_ptr) { 171 int c, s; 172 173 for (c = 0; c <= MAX_CHASSIS; c++) { 174 for (s = 0; s <= MAX_GEOSLOT; s++) { 175 if (units[c][s].fd == fd || units[c][s].find_fd == fd) { 176 if (chassis) *chassis = c; 177 if (geoslot) *geoslot = s; 178 if (unit_ptr) *unit_ptr = &units[c][s]; 179 return 1; 180 } 181 } 182 } 183 return 0; 184} 185 186static int read_client_nbytes(int fd, int count, unsigned char *buf) { 187 unit_t *u; 188 int chassis, geoslot; 189 int len; 190 191 find_unit_by_fd(fd, &chassis, &geoslot, &u); 192 while (count) { 193 if ((len = recv(fd, buf, count, 0)) <= 0) return -1; /* read in whatever data was sent to us */ 194 count -= len; 195 buf += len; 196 } /* till we have everything we are looking for */ 197 return 0; 198} 199 200static void empty_unit_iface(unit_t *u) { 201 iface_t *p, *cur; 202 203 cur = u->iface; 204 while (cur) { /* loop over all the interface entries */ 205 if (cur->name) free(cur->name); /* throwing away the contents if they exist */ 206 if (cur->IOPname) free(cur->IOPname); 207 p = cur->next; 208 free(cur); /* then throw away the structure itself */ 209 cur = p; 210 } 211 u->iface = 0; /* and finally remember that there are no remaining structure */ 212} 213 214static void empty_unit(int chassis, int geoslot) { 215 unit_t *u = &units[chassis][geoslot]; 216 217 empty_unit_iface(u); 218 if (u->imsg) { /* then if an inbound message buffer exists */ 219 void *bigger_buffer; 220 221 bigger_buffer = (char *)realloc(u->imsg, 1); /* and re-allocate the old large buffer into a new small one */ 222 if (bigger_buffer == NULL) { /* oops, realloc call failed */ 223 fprintf(stderr, "Warning...call to realloc() failed, value of errno is %d\n", errno); 224 return; 225 } 226 u->imsg = bigger_buffer; 227 } 228} 229 230static void empty_unit_table(void) { 231 int chassis, geoslot; 232 233 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { 234 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 235 if (units[chassis][geoslot].ip != NULL) { 236 free(units[chassis][geoslot].ip); /* get rid of the malloc'ed space that holds the IP address */ 237 units[chassis][geoslot].ip = 0; /* then set the pointer to NULL */ 238 } 239 empty_unit(chassis, geoslot); 240 } 241 } 242} 243 244static char *find_nth_interface_name(int n) { 245 int chassis, geoslot; 246 iface_t *p; 247 char *last_name = 0; 248 249 if (n < 0) n = 0; /* ensure we are working with a valid number */ 250 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */ 251 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 252 if (units[chassis][geoslot].ip != NULL) { 253 p = units[chassis][geoslot].iface; 254 while (p) { /* and all interfaces... */ 255 if (p->IOPname) last_name = p->name; /* remembering the last name found */ 256 if (n-- == 0) return last_name; /* and if we hit the instance requested */ 257 p = p->next; 258 } 259 } 260 } 261 } 262 /* if we couldn't fine the selected entry */ 263 if (last_name) return last_name; /* ... but we did have at least one entry... return the last entry found */ 264 return ""; /* ... but if there wasn't any entry... return an empty string instead */ 265} 266 267int acn_parse_hosts_file(char *errbuf) { /* returns: -1 = error, 0 = OK */ 268 FILE *fp; 269 char buf[MAX_LINE_SIZE]; 270 char *ptr, *ptr2; 271 int pos; 272 int chassis, geoslot; 273 unit_t *u; 274 275 empty_unit_table(); 276 if ((fp = fopen("/etc/hosts", "r")) == NULL) { /* try to open the hosts file and if it fails */ 277 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot open '/etc/hosts' for reading."); /* return the nohostsfile error response */ 278 return -1; 279 } 280 while (fgets(buf, MAX_LINE_SIZE-1, fp)) { /* while looping over the file */ 281 282 pos = strcspn(buf, "#\n\r"); /* find the first comment character or EOL */ 283 *(buf + pos) = '\0'; /* and clobber it and anything that follows it */ 284 285 pos = strspn(buf, " \t"); /* then find the first non-white space */ 286 if (pos == strlen(buf)) /* if there is nothing but white space on the line */ 287 continue; /* ignore that empty line */ 288 ptr = buf + pos; /* and skip over any of that leading whitespace */ 289 290 if ((ptr2 = strstr(ptr, "_I_")) == NULL) /* skip any lines that don't have names that look like they belong to IOPs */ 291 continue; 292 if (*(ptr2 + 4) != '_') /* and skip other lines that have names that don't look like ACN components */ 293 continue; 294 *(ptr + strcspn(ptr, " \t")) = '\0'; /* null terminate the IP address so its a standalone string */ 295 296 chassis = *(ptr2 + 3) - '0'; /* extract the chassis number */ 297 geoslot = *(ptr2 + 5) - '0'; /* and geo-slot number */ 298 if (chassis < 1 || chassis > MAX_CHASSIS || 299 geoslot < 1 || geoslot > MAX_GEOSLOT) { /* if the chassis and/or slot numbers appear to be bad... */ 300 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Invalid ACN name in '/etc/hosts'."); /* warn the user */ 301 continue; /* and ignore the entry */ 302 } 303 ptr2 = strdup(ptr); /* copy the IP address into our malloc'ed memory */ 304 if (ptr2 == NULL) { 305 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, 306 errno, "malloc"); 307 continue; 308 } 309 u = &units[chassis][geoslot]; 310 u->ip = ptr2; /* and remember the whole shebang */ 311 u->chassis = chassis; 312 u->geoslot = geoslot; 313 } 314 fclose(fp); 315 if (*errbuf) return -1; 316 else return 0; 317} 318 319static int open_with_IOP(unit_t *u, int flag) { 320 int sockfd; 321 char *ip; 322 323 if (u->serv_addr == NULL) { 324 u->serv_addr = malloc(sizeof(struct sockaddr_in)); 325 326 /* since we called malloc(), lets check to see if we actually got the memory */ 327 if (u->serv_addr == NULL) { /* oops, we didn't get the memory requested */ 328 fprintf(stderr, "malloc() request for u->serv_addr failed, value of errno is: %d\n", errno); 329 return 0; 330 } 331 332 } 333 ip = u->ip; 334 /* bzero() is deprecated, replaced with memset() */ 335 memset((char *)u->serv_addr, 0, sizeof(struct sockaddr_in)); 336 u->serv_addr->sin_family = AF_INET; 337 u->serv_addr->sin_addr.s_addr = inet_addr(ip); 338 u->serv_addr->sin_port = htons(IOP_SNIFFER_PORT); 339 340 if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { 341 fprintf(stderr, "pcap can't open a socket for connecting to IOP at %s\n", ip); 342 return 0; 343 } 344 if (connect(sockfd, (struct sockaddr *)u->serv_addr, sizeof(struct sockaddr_in)) < 0) { 345 fprintf(stderr, "pcap can't connect to IOP at %s\n", ip); 346 return 0; 347 } 348 if (flag == LIVE) u->fd = sockfd; 349 else u->find_fd = sockfd; 350 u->first_time = 0; 351 return sockfd; /* return the non-zero file descriptor as a 'success' indicator */ 352} 353 354static void close_with_IOP(int chassis, int geoslot, int flag) { 355 int *id; 356 357 if (flag == LIVE) id = &units[chassis][geoslot].fd; 358 else id = &units[chassis][geoslot].find_fd; 359 360 if (*id) { /* this was the last time, so... if we are connected... */ 361 close(*id); /* disconnect us */ 362 *id = 0; /* and forget that the descriptor exists because we are not open */ 363 } 364} 365 366static void pcap_cleanup_acn(pcap_t *handle) { 367 int chassis, geoslot; 368 unit_t *u; 369 370 if (find_unit_by_fd(handle->fd, &chassis, &geoslot, &u) == 0) 371 return; 372 close_with_IOP(chassis, geoslot, LIVE); 373 if (u) 374 u->first_time = 0; 375 pcap_cleanup_live_common(handle); 376} 377 378static void send_to_fd(int fd, int len, unsigned char *str) { 379 int nwritten; 380 int chassis, geoslot; 381 382 while (len > 0) { 383 if ((nwritten = write(fd, str, len)) <= 0) { 384 find_unit_by_fd(fd, &chassis, &geoslot, NULL); 385 if (units[chassis][geoslot].fd == fd) close_with_IOP(chassis, geoslot, LIVE); 386 else if (units[chassis][geoslot].find_fd == fd) close_with_IOP(chassis, geoslot, FIND); 387 empty_unit(chassis, geoslot); 388 return; 389 } 390 len -= nwritten; 391 str += nwritten; 392 } 393} 394 395static void acn_freealldevs(void) { 396 397 pcap_if_t *iff, *next_iff; 398 pcap_addr_t *addr, *next_addr; 399 400 for (iff = acn_if_list; iff != NULL; iff = next_iff) { 401 next_iff = iff->next; 402 for (addr = iff->addresses; addr != NULL; addr = next_addr) { 403 next_addr = addr->next; 404 if (addr->addr) free(addr->addr); 405 if (addr->netmask) free(addr->netmask); 406 if (addr->broadaddr) free(addr->broadaddr); 407 if (addr->dstaddr) free(addr->dstaddr); 408 free(addr); 409 } 410 if (iff->name) free(iff->name); 411 if (iff->description) free(iff->description); 412 free(iff); 413 } 414} 415 416static void nonUnified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u) { 417 418 snprintf(buf, bufsize, "%s_%d_%d", proto, u->chassis, u->geoslot); 419} 420 421static void unified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u, int IOPportnum) { 422 int portnum; 423 424 portnum = ((u->chassis - 1) * 64) + ((u->geoslot - 1) * 8) + IOPportnum + 1; 425 snprintf(buf, bufsize, "%s_%d", proto, portnum); 426} 427 428static char *translate_IOP_to_pcap_name(unit_t *u, char *IOPname, bpf_u_int32 iftype) { 429 iface_t *iface_ptr, *iface; 430 char buf[32]; 431 char *proto; 432 char *port; 433 int IOPportnum = 0; 434 435 iface = malloc(sizeof(iface_t)); /* get memory for a structure */ 436 if (iface == NULL) { /* oops, we didn't get the memory requested */ 437 fprintf(stderr, "Error...couldn't allocate memory for interface structure...value of errno is: %d\n", errno); 438 return NULL; 439 } 440 memset((char *)iface, 0, sizeof(iface_t)); /* bzero is deprecated(), replaced with memset() */ 441 442 iface->iftype = iftype; /* remember the interface type of this interface */ 443 444 iface->IOPname = strdup(IOPname); /* copy it and stick it into the structure */ 445 if (iface->IOPname == NULL) { /* oops, we didn't get the memory requested */ 446 fprintf(stderr, "Error...couldn't allocate memory for IOPname...value of errno is: %d\n", errno); 447 return NULL; 448 } 449 450 if (strncmp(IOPname, "lo", 2) == 0) { 451 IOPportnum = atoi(&IOPname[2]); 452 switch (iftype) { 453 case DLT_EN10MB: 454 nonUnified_IOP_port_name(buf, sizeof buf, "lo", u); 455 break; 456 default: 457 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum); 458 break; 459 } 460 } else if (strncmp(IOPname, "eth", 3) == 0) { 461 IOPportnum = atoi(&IOPname[3]); 462 switch (iftype) { 463 case DLT_EN10MB: 464 nonUnified_IOP_port_name(buf, sizeof buf, "eth", u); 465 break; 466 default: 467 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum); 468 break; 469 } 470 } else if (strncmp(IOPname, "wan", 3) == 0) { 471 IOPportnum = atoi(&IOPname[3]); 472 switch (iftype) { 473 case DLT_SITA: 474 unified_IOP_port_name(buf, sizeof buf, "wan", u, IOPportnum); 475 break; 476 default: 477 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum); 478 break; 479 } 480 } else { 481 fprintf(stderr, "Error... invalid IOP name %s\n", IOPname); 482 return NULL; 483 } 484 485 iface->name = strdup(buf); /* make a copy and stick it into the structure */ 486 if (iface->name == NULL) { /* oops, we didn't get the memory requested */ 487 fprintf(stderr, "Error...couldn't allocate memory for IOP port name...value of errno is: %d\n", errno); 488 return NULL; 489 } 490 491 if (u->iface == 0) { /* if this is the first name */ 492 u->iface = iface; /* stick this entry at the head of the list */ 493 } else { 494 iface_ptr = u->iface; 495 while (iface_ptr->next) { /* otherwise scan the list */ 496 iface_ptr = iface_ptr->next; /* till we're at the last entry */ 497 } 498 iface_ptr->next = iface; /* then tack this entry on the end of the list */ 499 } 500 return iface->name; 501} 502 503static int if_sort(char *s1, char *s2) { 504 char *s1_p2, *s2_p2; 505 char str1[MAX_LINE_SIZE], str2[MAX_LINE_SIZE]; 506 int s1_p1_len, s2_p1_len; 507 int retval; 508 509 if ((s1_p2 = strchr(s1, '_'))) { /* if an underscore is found... */ 510 s1_p1_len = s1_p2 - s1; /* the prefix length is the difference in pointers */ 511 s1_p2++; /* the suffix actually starts _after_ the underscore */ 512 } else { /* otherwise... */ 513 s1_p1_len = strlen(s1); /* the prefix length is the length of the string itself */ 514 s1_p2 = 0; /* and there is no suffix */ 515 } 516 if ((s2_p2 = strchr(s2, '_'))) { /* now do the same for the second string */ 517 s2_p1_len = s2_p2 - s2; 518 s2_p2++; 519 } else { 520 s2_p1_len = strlen(s2); 521 s2_p2 = 0; 522 } 523 strncpy(str1, s1, (s1_p1_len > sizeof(str1)) ? s1_p1_len : sizeof(str1)); *(str1 + s1_p1_len) = 0; 524 strncpy(str2, s2, (s2_p1_len > sizeof(str2)) ? s2_p1_len : sizeof(str2)); *(str2 + s2_p1_len) = 0; 525 retval = strcmp(str1, str2); 526 if (retval != 0) return retval; /* if they are not identical, then we can quit now and return the indication */ 527 return strcmp(s1_p2, s2_p2); /* otherwise we return the result of comparing the 2nd half of the string */ 528} 529 530static void sort_if_table(void) { 531 pcap_if_t *p1, *p2, *prev, *temp; 532 int has_swapped; 533 534 if (!acn_if_list) return; /* nothing to do if the list is empty */ 535 536 while (1) { 537 p1 = acn_if_list; /* start at the head of the list */ 538 prev = 0; 539 has_swapped = 0; 540 while ((p2 = p1->next)) { 541 if (if_sort(p1->name, p2->name) > 0) { 542 if (prev) { /* we are swapping things that are _not_ at the head of the list */ 543 temp = p2->next; 544 prev->next = p2; 545 p2->next = p1; 546 p1->next = temp; 547 } else { /* special treatment if we are swapping with the head of the list */ 548 temp = p2->next; 549 acn_if_list= p2; 550 p2->next = p1; 551 p1->next = temp; 552 } 553 p1 = p2; 554 prev = p1; 555 has_swapped = 1; 556 } 557 prev = p1; 558 p1 = p1->next; 559 } 560 if (has_swapped == 0) 561 return; 562 } 563 return; 564} 565 566static int process_client_data (char *errbuf) { /* returns: -1 = error, 0 = OK */ 567 int chassis, geoslot; 568 unit_t *u; 569 pcap_if_t *iff, *prev_iff; 570 pcap_addr_t *addr, *prev_addr; 571 char *ptr; 572 int address_count; 573 struct sockaddr_in *s; 574 char *newname; 575 bpf_u_int32 interfaceType; 576 unsigned char flags; 577 void *bigger_buffer; 578 579 prev_iff = 0; 580 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { 581 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { /* now loop over all the devices */ 582 u = &units[chassis][geoslot]; 583 empty_unit_iface(u); 584 ptr = u->imsg; /* point to the start of the msg for this IOP */ 585 while (ptr < (u->imsg + u->len)) { 586 if ((iff = malloc(sizeof(pcap_if_t))) == NULL) { 587 pcap_fmt_errmsg_for_errno(errbuf, 588 PCAP_ERRBUF_SIZE, errno, "malloc"); 589 return -1; 590 } 591 memset((char *)iff, 0, sizeof(pcap_if_t)); /* bzero() is deprecated, replaced with memset() */ 592 if (acn_if_list == 0) acn_if_list = iff; /* remember the head of the list */ 593 if (prev_iff) prev_iff->next = iff; /* insert a forward link */ 594 595 if (*ptr) { /* if there is a count for the name */ 596 if ((iff->name = malloc(*ptr + 1)) == NULL) { /* get that amount of space */ 597 pcap_fmt_errmsg_for_errno(errbuf, 598 PCAP_ERRBUF_SIZE, errno, 599 "malloc"); 600 return -1; 601 } 602 memcpy(iff->name, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */ 603 *(iff->name + *ptr) = 0; /* and null terminate the string */ 604 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */ 605 } 606 ptr++; 607 608 if (*ptr) { /* if there is a count for the description */ 609 if ((iff->description = malloc(*ptr + 1)) == NULL) { /* get that amount of space */ 610 pcap_fmt_errmsg_for_errno(errbuf, 611 PCAP_ERRBUF_SIZE, errno, 612 "malloc"); 613 return -1; 614 } 615 memcpy(iff->description, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */ 616 *(iff->description + *ptr) = 0; /* and null terminate the string */ 617 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */ 618 } 619 ptr++; 620 621 interfaceType = ntohl(*(bpf_u_int32 *)ptr); 622 ptr += 4; /* skip over the interface type */ 623 624 flags = *ptr++; 625 if (flags) iff->flags = PCAP_IF_LOOPBACK; /* if this is a loopback style interface, lets mark it as such */ 626 627 address_count = *ptr++; 628 629 prev_addr = 0; 630 while (address_count--) { 631 if ((addr = malloc(sizeof(pcap_addr_t))) == NULL) { 632 pcap_fmt_errmsg_for_errno(errbuf, 633 PCAP_ERRBUF_SIZE, errno, 634 "malloc"); 635 return -1; 636 } 637 memset((char *)addr, 0, sizeof(pcap_addr_t)); /* bzero() is deprecated, replaced with memset() */ 638 if (iff->addresses == 0) iff->addresses = addr; 639 if (prev_addr) prev_addr->next = addr; /* insert a forward link */ 640 if (*ptr) { /* if there is a count for the address */ 641 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { /* get that amount of space */ 642 pcap_fmt_errmsg_for_errno(errbuf, 643 PCAP_ERRBUF_SIZE, 644 errno, "malloc"); 645 return -1; 646 } 647 memset((char *)s, 0, sizeof(struct sockaddr_in)); /* bzero() is deprecated, replaced with memset() */ 648 addr->addr = (struct sockaddr *)s; 649 s->sin_family = AF_INET; 650 s->sin_addr.s_addr = *(bpf_u_int32 *)(ptr + 1); /* copy the address in */ 651 ptr += *ptr; /* now move the pointer forwards according to the specified length of the address */ 652 } 653 ptr++; /* then forwards one more for the 'length of the address' field */ 654 if (*ptr) { /* process any netmask */ 655 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { 656 pcap_fmt_errmsg_for_errno(errbuf, 657 PCAP_ERRBUF_SIZE, 658 errno, "malloc"); 659 return -1; 660 } 661 /* bzero() is deprecated, replaced with memset() */ 662 memset((char *)s, 0, sizeof(struct sockaddr_in)); 663 664 addr->netmask = (struct sockaddr *)s; 665 s->sin_family = AF_INET; 666 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1); 667 ptr += *ptr; 668 } 669 ptr++; 670 if (*ptr) { /* process any broadcast address */ 671 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { 672 pcap_fmt_errmsg_for_errno(errbuf, 673 PCAP_ERRBUF_SIZE, 674 errno, "malloc"); 675 return -1; 676 } 677 /* bzero() is deprecated, replaced with memset() */ 678 memset((char *)s, 0, sizeof(struct sockaddr_in)); 679 680 addr->broadaddr = (struct sockaddr *)s; 681 s->sin_family = AF_INET; 682 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1); 683 ptr += *ptr; 684 } 685 ptr++; 686 if (*ptr) { /* process any destination address */ 687 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { 688 pcap_fmt_errmsg_for_errno(errbuf, 689 PCAP_ERRBUF_SIZE, 690 errno, "malloc"); 691 return -1; 692 } 693 /* bzero() is deprecated, replaced with memset() */ 694 memset((char *)s, 0, sizeof(struct sockaddr_in)); 695 696 addr->dstaddr = (struct sockaddr *)s; 697 s->sin_family = AF_INET; 698 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1); 699 ptr += *ptr; 700 } 701 ptr++; 702 prev_addr = addr; 703 } 704 prev_iff = iff; 705 706 newname = translate_IOP_to_pcap_name(u, iff->name, interfaceType); /* add a translation entry and get a point to the mangled name */ 707 bigger_buffer = realloc(iff->name, strlen(newname) + 1); 708 if (bigger_buffer == NULL) { /* we now re-write the name stored in the interface list */ 709 pcap_fmt_errmsg_for_errno(errbuf, 710 PCAP_ERRBUF_SIZE, errno, "realloc"); 711 return -1; 712 } 713 iff->name = bigger_buffer; 714 strcpy(iff->name, newname); /* to this new name */ 715 } 716 } 717 } 718 return 0; 719} 720 721static int read_client_data (int fd) { 722 unsigned char buf[256]; 723 int chassis, geoslot; 724 unit_t *u; 725 int len; 726 727 find_unit_by_fd(fd, &chassis, &geoslot, &u); 728 729 if ((len = recv(fd, buf, sizeof(buf), 0)) <= 0) return 0; /* read in whatever data was sent to us */ 730 731 if ((u->imsg = realloc(u->imsg, (u->len + len))) == NULL) /* extend the buffer for the new data */ 732 return 0; 733 memcpy((u->imsg + u->len), buf, len); /* append the new data */ 734 u->len += len; 735 return 1; 736} 737 738static void wait_for_all_answers(void) { 739 int retval; 740 struct timeval tv; 741 int fd; 742 int chassis, geoslot; 743 744 tv.tv_sec = 2; 745 tv.tv_usec = 0; 746 747 while (1) { 748 int flag = 0; 749 fd_set working_set; 750 751 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of descriptors we may be listening to */ 752 if (FD_ISSET(fd, &readfds)) flag = 1; /* and see if there are any still set */ 753 } 754 if (flag == 0) return; /* we are done, when they are all gone */ 755 756 memcpy(&working_set, &readfds, sizeof(readfds)); /* otherwise, we still have to listen for more stuff, till we timeout */ 757 retval = select(max_fs + 1, &working_set, NULL, NULL, &tv); 758 if (retval == -1) { /* an error occurred !!!!! */ 759 return; 760 } else if (retval == 0) { /* timeout occurred, so process what we've got sofar and return */ 761 printf("timeout\n"); 762 return; 763 } else { 764 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of things to do, and do them */ 765 if (FD_ISSET(fd, &working_set)) { 766 if (read_client_data(fd) == 0) { /* if the socket has closed */ 767 FD_CLR(fd, &readfds); /* and descriptors we listen to for errors */ 768 find_unit_by_fd(fd, &chassis, &geoslot, NULL); 769 close_with_IOP(chassis, geoslot, FIND); /* and close out connection to him */ 770 } 771 } 772 } 773 } 774 } 775} 776 777static char *get_error_response(int fd, char *errbuf) { /* return a pointer on error, NULL on no error */ 778 char byte; 779 int len = 0; 780 781 while (1) { 782 recv(fd, &byte, 1, 0); /* read another byte in */ 783 if (errbuf && (len++ < PCAP_ERRBUF_SIZE)) { /* and if there is still room in the buffer */ 784 *errbuf++ = byte; /* stick it in */ 785 *errbuf = '\0'; /* ensure the string is null terminated just in case we might exceed the buffer's size */ 786 } 787 if (byte == '\0') { 788 if (len > 1) { return errbuf; } 789 else { return NULL; } 790 } 791 } 792} 793 794int acn_findalldevs(char *errbuf) { /* returns: -1 = error, 0 = OK */ 795 int chassis, geoslot; 796 unit_t *u; 797 798 FD_ZERO(&readfds); 799 max_fs = 0; 800 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { 801 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 802 u = &units[chassis][geoslot]; 803 if (u->ip && (open_with_IOP(u, FIND))) { /* connect to the remote IOP */ 804 send_to_fd(u->find_fd, 1, (unsigned char *)"\0"); 805 if (get_error_response(u->find_fd, errbuf)) 806 close_with_IOP(chassis, geoslot, FIND); 807 else { 808 if (u->find_fd > max_fs) 809 max_fs = u->find_fd; /* remember the highest number currently in use */ 810 FD_SET(u->find_fd, &readfds); /* we are going to want to read this guy's response to */ 811 u->len = 0; 812 send_to_fd(u->find_fd, 1, (unsigned char *)"Q"); /* this interface query request */ 813 } 814 } 815 } 816 } 817 wait_for_all_answers(); 818 if (process_client_data(errbuf)) 819 return -1; 820 sort_if_table(); 821 return 0; 822} 823 824static int pcap_stats_acn(pcap_t *handle, struct pcap_stat *ps) { 825 unsigned char buf[12]; 826 827 send_to_fd(handle->fd, 1, (unsigned char *)"S"); /* send the get_stats command to the IOP */ 828 829 if (read_client_nbytes(handle->fd, sizeof(buf), buf) == -1) return -1; /* try reading the required bytes */ 830 831 ps->ps_recv = ntohl(*(uint32_t *)&buf[0]); /* break the buffer into its three 32 bit components */ 832 ps->ps_drop = ntohl(*(uint32_t *)&buf[4]); 833 ps->ps_ifdrop = ntohl(*(uint32_t *)&buf[8]); 834 835 return 0; 836} 837 838static int acn_open_live(const char *name, char *errbuf, int *linktype) { /* returns 0 on error, else returns the file descriptor */ 839 int chassis, geoslot; 840 unit_t *u; 841 iface_t *p; 842 pcap_if_list_t devlist; 843 844 pcap_platform_finddevs(&devlist, errbuf); 845 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */ 846 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 847 u = &units[chassis][geoslot]; 848 if (u->ip != NULL) { 849 p = u->iface; 850 while (p) { /* and all interfaces... */ 851 if (p->IOPname && p->name && (strcmp(p->name, name) == 0)) { /* and if we found the interface we want... */ 852 *linktype = p->iftype; 853 open_with_IOP(u, LIVE); /* start a connection with that IOP */ 854 send_to_fd(u->fd, strlen(p->IOPname)+1, (unsigned char *)p->IOPname); /* send the IOP's interface name, and a terminating null */ 855 if (get_error_response(u->fd, errbuf)) { 856 return -1; 857 } 858 return u->fd; /* and return that open descriptor */ 859 } 860 p = p->next; 861 } 862 } 863 } 864 } 865 return -1; /* if the interface wasn't found, return an error */ 866} 867 868static void acn_start_monitor(int fd, int snaplen, int timeout, int promiscuous, int direction) { 869 unsigned char buf[8]; 870 unit_t *u; 871 872 //printf("acn_start_monitor()\n"); // fulko 873 find_unit_by_fd(fd, NULL, NULL, &u); 874 if (u->first_time == 0) { 875 buf[0] = 'M'; 876 *(uint32_t *)&buf[1] = htonl(snaplen); 877 buf[5] = timeout; 878 buf[6] = promiscuous; 879 buf[7] = direction; 880 //printf("acn_start_monitor() first time\n"); // fulko 881 send_to_fd(fd, 8, buf); /* send the start monitor command with its parameters to the IOP */ 882 u->first_time = 1; 883 } 884 //printf("acn_start_monitor() complete\n"); // fulko 885} 886 887static int pcap_inject_acn(pcap_t *p, const void *buf _U_, int size _U_) { 888 pcap_strlcpy(p->errbuf, "Sending packets isn't supported on ACN adapters", 889 PCAP_ERRBUF_SIZE); 890 return (-1); 891} 892 893static int pcap_setfilter_acn(pcap_t *handle, struct bpf_program *bpf) { 894 int fd = handle->fd; 895 int count; 896 struct bpf_insn *p; 897 uint16_t shortInt; 898 uint32_t longInt; 899 900 send_to_fd(fd, 1, (unsigned char *)"F"); /* BPF filter follows command */ 901 count = bpf->bf_len; 902 longInt = htonl(count); 903 send_to_fd(fd, 4, (unsigned char *)&longInt); /* send the instruction sequence count */ 904 p = bpf->bf_insns; 905 while (count--) { /* followed by the list of instructions */ 906 shortInt = htons(p->code); 907 longInt = htonl(p->k); 908 send_to_fd(fd, 2, (unsigned char *)&shortInt); 909 send_to_fd(fd, 1, (unsigned char *)&p->jt); 910 send_to_fd(fd, 1, (unsigned char *)&p->jf); 911 send_to_fd(fd, 4, (unsigned char *)&longInt); 912 p++; 913 } 914 if (get_error_response(fd, NULL)) 915 return -1; 916 return 0; 917} 918 919static int acn_read_n_bytes_with_timeout(pcap_t *handle, int count) { 920 struct timeval tv; 921 int retval, fd; 922 fd_set r_fds; 923 fd_set w_fds; 924 u_char *bp; 925 int len = 0; 926 int offset = 0; 927 928 tv.tv_sec = 5; 929 tv.tv_usec = 0; 930 931 fd = handle->fd; 932 FD_ZERO(&r_fds); 933 FD_SET(fd, &r_fds); 934 memcpy(&w_fds, &r_fds, sizeof(r_fds)); 935 bp = handle->bp; 936 while (count) { 937 retval = select(fd + 1, &w_fds, NULL, NULL, &tv); 938 if (retval == -1) { /* an error occurred !!!!! */ 939// fprintf(stderr, "error during packet data read\n"); 940 return -1; /* but we need to return a good indication to prevent unnecessary popups */ 941 } else if (retval == 0) { /* timeout occurred, so process what we've got sofar and return */ 942// fprintf(stderr, "timeout during packet data read\n"); 943 return -1; 944 } else { 945 if ((len = recv(fd, (bp + offset), count, 0)) <= 0) { 946// fprintf(stderr, "premature exit during packet data rx\n"); 947 return -1; 948 } 949 count -= len; 950 offset += len; 951 } 952 } 953 return 0; 954} 955 956static int pcap_read_acn(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) { 957 #define HEADER_SIZE (4 * 4) 958 unsigned char packet_header[HEADER_SIZE]; 959 struct pcap_pkthdr pcap_header; 960 961 //printf("pcap_read_acn()\n"); // fulko 962 acn_start_monitor(handle->fd, handle->snapshot, handle->opt.timeout, handle->opt.promisc, handle->direction); /* maybe tell him to start monitoring */ 963 //printf("pcap_read_acn() after start monitor\n"); // fulko 964 965 handle->bp = packet_header; 966 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 */ 967 968 pcap_header.ts.tv_sec = ntohl(*(uint32_t *)&packet_header[0]); /* tv_sec */ 969 pcap_header.ts.tv_usec = ntohl(*(uint32_t *)&packet_header[4]); /* tv_usec */ 970 pcap_header.caplen = ntohl(*(uint32_t *)&packet_header[8]); /* caplen */ 971 pcap_header.len = ntohl(*(uint32_t *)&packet_header[12]); /* len */ 972 973 handle->bp = (u_char *)handle->buffer + handle->offset; /* start off the receive pointer at the right spot */ 974 if (acn_read_n_bytes_with_timeout(handle, pcap_header.caplen) == -1) return 0; /* then try to read in the rest of the data */ 975 976 callback(user, &pcap_header, handle->bp); /* call the user supplied callback function */ 977 return 1; 978} 979 980static int pcap_activate_sita(pcap_t *handle) { 981 int fd; 982 983 if (handle->opt.rfmon) { 984 /* 985 * No monitor mode on SITA devices (they're not Wi-Fi 986 * devices). 987 */ 988 return PCAP_ERROR_RFMON_NOTSUP; 989 } 990 991 /* Initialize some components of the pcap structure. */ 992 993 handle->inject_op = pcap_inject_acn; 994 handle->setfilter_op = pcap_setfilter_acn; 995 handle->setdirection_op = NULL; /* Not implemented */ 996 handle->set_datalink_op = NULL; /* can't change data link type */ 997 handle->getnonblock_op = pcap_getnonblock_fd; 998 handle->setnonblock_op = pcap_setnonblock_fd; 999 handle->cleanup_op = pcap_cleanup_acn; 1000 handle->read_op = pcap_read_acn; 1001 handle->stats_op = pcap_stats_acn; 1002 1003 fd = acn_open_live(handle->opt.device, handle->errbuf, 1004 &handle->linktype); 1005 if (fd == -1) 1006 return PCAP_ERROR; 1007 1008 /* 1009 * Turn a negative snapshot value (invalid), a snapshot value of 1010 * 0 (unspecified), or a value bigger than the normal maximum 1011 * value, into the maximum allowed value. 1012 * 1013 * If some application really *needs* a bigger snapshot 1014 * length, we should just increase MAXIMUM_SNAPLEN. 1015 */ 1016 if (handle->snapshot <= 0 || handle->snapshot > MAXIMUM_SNAPLEN) 1017 handle->snapshot = MAXIMUM_SNAPLEN; 1018 1019 handle->fd = fd; 1020 handle->bufsize = handle->snapshot; 1021 1022 /* Allocate the buffer */ 1023 1024 handle->buffer = malloc(handle->bufsize + handle->offset); 1025 if (!handle->buffer) { 1026 pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, 1027 errno, "malloc"); 1028 pcap_cleanup_acn(handle); 1029 return PCAP_ERROR; 1030 } 1031 1032 /* 1033 * "handle->fd" is a socket, so "select()" and "poll()" 1034 * should work on it. 1035 */ 1036 handle->selectable_fd = handle->fd; 1037 1038 return 0; 1039} 1040 1041pcap_t *pcap_create_interface(const char *device _U_, char *ebuf) { 1042 pcap_t *p; 1043 1044 p = PCAP_CREATE_COMMON(ebuf, struct pcap_sita); 1045 if (p == NULL) 1046 return (NULL); 1047 1048 p->activate_op = pcap_activate_sita; 1049 return (p); 1050} 1051 1052int pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf) { 1053 1054 //printf("pcap_findalldevs()\n"); // fulko 1055 1056 *alldevsp = 0; /* initialize the returned variables before we do anything */ 1057 strcpy(errbuf, ""); 1058 if (acn_parse_hosts_file(errbuf)) /* scan the hosts file for potential IOPs */ 1059 { 1060 //printf("pcap_findalldevs() returning BAD after parsehosts\n"); // fulko 1061 return -1; 1062 } 1063 //printf("pcap_findalldevs() got hostlist now finding devs\n"); // fulko 1064 if (acn_findalldevs(errbuf)) /* then ask the IOPs for their monitorable devices */ 1065 { 1066 //printf("pcap_findalldevs() returning BAD after findalldevs\n"); // fulko 1067 return -1; 1068 } 1069 devlistp->beginning = acn_if_list; 1070 acn_if_list = 0; /* then forget our list head, because someone will call pcap_freealldevs() to empty the malloc'ed stuff */ 1071 //printf("pcap_findalldevs() returning ZERO OK\n"); // fulko 1072 return 0; 1073} 1074 1075/* 1076 * Libpcap version string. 1077 */ 1078const char * 1079pcap_lib_version(void) 1080{ 1081 return PCAP_VERSION_STRING " (SITA-only)"; 1082} 1083