1 /* $NetBSD: pcap-sita.c,v 1.3 2015/03/31 21:39:42 christos Exp $ */ 2 3 /* 4 * pcap-sita.c: Packet capture interface additions for SITA ACN devices 5 * 6 * Copyright (c) 2007 Fulko Hew, SITA INC Canada, Inc <fulko.hew@sita.aero> 7 * 8 * License: BSD 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 3. The names of the authors may not be used to endorse or promote 21 * products derived from this software without specific prior 22 * written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 26 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 27 */ 28 29 #include <sys/cdefs.h> 30 __RCSID("$NetBSD: pcap-sita.c,v 1.3 2015/03/31 21:39:42 christos Exp $"); 31 32 #ifdef HAVE_CONFIG_H 33 #include "config.h" 34 #endif 35 36 #include <stdio.h> 37 #include <string.h> 38 #include <stdlib.h> 39 #include <unistd.h> 40 #include <fcntl.h> 41 #include <errno.h> 42 #include <sys/time.h> 43 #include <sys/socket.h> 44 #include <netinet/in.h> 45 #include <arpa/inet.h> 46 #include "pcap-int.h" 47 48 #include "pcap-sita.h" 49 50 /* non-configureable manifests follow */ 51 52 #define IOP_SNIFFER_PORT 49152 /* TCP port on the IOP used for 'distributed pcap' usage */ 53 #define MAX_LINE_SIZE 255 /* max size of a buffer/line in /etc/hosts we allow */ 54 #define MAX_CHASSIS 8 /* number of chassis in an ACN site */ 55 #define MAX_GEOSLOT 8 /* max number of access units in an ACN site */ 56 57 #define FIND 0 58 #define LIVE 1 59 60 typedef struct iface { 61 struct iface *next; /* a pointer to the next interface */ 62 char *name; /* this interface's name */ 63 char *IOPname; /* this interface's name on an IOP */ 64 uint32_t iftype; /* the type of interface (DLT values) */ 65 } iface_t; 66 67 typedef struct unit { 68 char *ip; /* this unit's IP address (as extracted from /etc/hosts) */ 69 int fd; /* the connection to this unit (if it exists) */ 70 int find_fd; /* a big kludge to avoid my programming limitations since I could have this unit open for findalldevs purposes */ 71 int first_time; /* 0 = just opened via acn_open_live(), ie. the first time, NZ = nth time */ 72 struct sockaddr_in *serv_addr; /* the address control block for comms to this unit */ 73 int chassis; 74 int geoslot; 75 iface_t *iface; /* a pointer to a linked list of interface structures */ 76 char *imsg; /* a pointer to an inbound message */ 77 int len; /* the current size of the inbound message */ 78 } unit_t; 79 80 static unit_t units[MAX_CHASSIS+1][MAX_GEOSLOT+1]; /* we use indexes of 1 through 8, but we reserve/waste index 0 */ 81 static fd_set readfds; /* a place to store the file descriptors for the connections to the IOPs */ 82 static int max_fs; 83 84 pcap_if_t *acn_if_list; /* pcap's list of available interfaces */ 85 86 static void dump_interface_list(void) { 87 pcap_if_t *iff; 88 pcap_addr_t *addr; 89 int longest_name_len = 0; 90 char *n, *d, *f; 91 int if_number = 0; 92 93 iff = acn_if_list; 94 while (iff) { 95 if (iff->name && (strlen(iff->name) > longest_name_len)) longest_name_len = strlen(iff->name); 96 iff = iff->next; 97 } 98 iff = acn_if_list; 99 printf("Interface List:\n"); 100 while (iff) { 101 n = (iff->name) ? iff->name : ""; 102 d = (iff->description) ? iff->description : ""; 103 f = (iff->flags == PCAP_IF_LOOPBACK) ? "L" : ""; 104 printf("%3d: %*s %s '%s'\n", if_number++, longest_name_len, n, f, d); 105 addr = iff->addresses; 106 while (addr) { 107 printf("%*s ", (5 + longest_name_len), ""); /* add some indentation */ 108 printf("%15s ", (addr->addr) ? inet_ntoa(((struct sockaddr_in *)addr->addr)->sin_addr) : ""); 109 printf("%15s ", (addr->netmask) ? inet_ntoa(((struct sockaddr_in *)addr->netmask)->sin_addr) : ""); 110 printf("%15s ", (addr->broadaddr) ? inet_ntoa(((struct sockaddr_in *)addr->broadaddr)->sin_addr) : ""); 111 printf("%15s ", (addr->dstaddr) ? inet_ntoa(((struct sockaddr_in *)addr->dstaddr)->sin_addr) : ""); 112 printf("\n"); 113 addr = addr->next; 114 } 115 iff = iff->next; 116 } 117 } 118 119 static void dump(unsigned char *ptr, int i, int indent) { 120 fprintf(stderr, "%*s", indent, " "); 121 for (; i > 0; i--) { 122 fprintf(stderr, "%2.2x ", *ptr++); 123 } 124 fprintf(stderr, "\n"); 125 } 126 127 static void dump_interface_list_p(void) { 128 pcap_if_t *iff; 129 pcap_addr_t *addr; 130 int if_number = 0; 131 132 iff = acn_if_list; 133 printf("Interface Pointer @ %p is %p:\n", &acn_if_list, iff); 134 while (iff) { 135 printf("%3d: %p %p next: %p\n", if_number++, iff->name, iff->description, iff->next); 136 dump((unsigned char *)iff, sizeof(pcap_if_t), 5); 137 addr = iff->addresses; 138 while (addr) { 139 printf(" %p %p %p %p, next: %p\n", addr->addr, addr->netmask, addr->broadaddr, addr->dstaddr, addr->next); 140 dump((unsigned char *)addr, sizeof(pcap_addr_t), 10); 141 addr = addr->next; 142 } 143 iff = iff->next; 144 } 145 } 146 147 static void dump_unit_table(void) { 148 int chassis, geoslot; 149 iface_t *p; 150 151 printf("%c:%c %s %s\n", 'C', 'S', "fd", "IP Address"); 152 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { 153 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 154 if (units[chassis][geoslot].ip != NULL) 155 printf("%d:%d %2d %s\n", chassis, geoslot, units[chassis][geoslot].fd, units[chassis][geoslot].ip); 156 p = units[chassis][geoslot].iface; 157 while (p) { 158 char *n = (p->name) ? p->name : ""; 159 char *i = (p->IOPname) ? p->IOPname : ""; 160 p = p->next; 161 printf(" %12s -> %12s\n", i, n); 162 } 163 } 164 } 165 } 166 167 static int find_unit_by_fd(int fd, int *chassis, int *geoslot, unit_t **unit_ptr) { 168 int c, s; 169 170 for (c = 0; c <= MAX_CHASSIS; c++) { 171 for (s = 0; s <= MAX_GEOSLOT; s++) { 172 if (units[c][s].fd == fd || units[c][s].find_fd == fd) { 173 if (chassis) *chassis = c; 174 if (geoslot) *geoslot = s; 175 if (unit_ptr) *unit_ptr = &units[c][s]; 176 return 1; 177 } 178 } 179 } 180 return 0; 181 } 182 183 static int read_client_nbytes(int fd, int count, unsigned char *buf) { 184 unit_t *u; 185 int chassis, geoslot; 186 int len; 187 188 find_unit_by_fd(fd, &chassis, &geoslot, &u); 189 while (count) { 190 if ((len = recv(fd, buf, count, 0)) <= 0) return -1; /* read in whatever data was sent to us */ 191 count -= len; 192 buf += len; 193 } /* till we have everything we are looking for */ 194 return 0; 195 } 196 197 static void empty_unit_iface(unit_t *u) { 198 iface_t *p, *cur; 199 200 cur = u->iface; 201 while (cur) { /* loop over all the interface entries */ 202 if (cur->name) free(cur->name); /* throwing away the contents if they exist */ 203 if (cur->IOPname) free(cur->IOPname); 204 p = cur->next; 205 free(cur); /* then throw away the structure itself */ 206 cur = p; 207 } 208 u->iface = 0; /* and finally remember that there are no remaining structure */ 209 } 210 211 static void empty_unit(int chassis, int geoslot) { 212 unit_t *u = &units[chassis][geoslot]; 213 214 empty_unit_iface(u); 215 if (u->imsg) { /* then if an inbound message buffer exists */ 216 u->imsg = (char *)realloc(u->imsg, 1); /* and re-allocate the old large buffer into a new small one */ 217 if (u->imsg == NULL) { /* oops, realloc call failed */ 218 fprintf(stderr, "Warning...call to realloc() failed, value of errno is %d\n", errno); 219 220 } 221 } 222 223 static void empty_unit_table(void) { 224 int chassis, geoslot; 225 226 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { 227 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 228 if (units[chassis][geoslot].ip != NULL) { 229 free(units[chassis][geoslot].ip); /* get rid of the malloc'ed space that holds the IP address */ 230 units[chassis][geoslot].ip = 0; /* then set the pointer to NULL */ 231 } 232 empty_unit(chassis, geoslot); 233 } 234 } 235 } 236 237 static char *find_nth_interface_name(int n) { 238 int chassis, geoslot; 239 iface_t *p; 240 char *last_name = 0; 241 242 if (n < 0) n = 0; /* ensure we are working with a valid number */ 243 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */ 244 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 245 if (units[chassis][geoslot].ip != NULL) { 246 p = units[chassis][geoslot].iface; 247 while (p) { /* and all interfaces... */ 248 if (p->IOPname) last_name = p->name; /* remembering the last name found */ 249 if (n-- == 0) return last_name; /* and if we hit the instance requested */ 250 p = p->next; 251 } 252 } 253 } 254 } 255 /* if we couldn't fine the selected entry */ 256 if (last_name) return last_name; /* ... but we did have at least one entry... return the last entry found */ 257 return ""; /* ... but if there wasn't any entry... return an empty string instead */ 258 } 259 260 int acn_parse_hosts_file(char *errbuf) { /* returns: -1 = error, 0 = OK */ 261 FILE *fp; 262 char buf[MAX_LINE_SIZE]; 263 char *ptr, *ptr2; 264 int pos; 265 int chassis, geoslot; 266 unit_t *u; 267 268 empty_unit_table(); 269 if ((fp = fopen("/etc/hosts", "r")) == NULL) { /* try to open the hosts file and if it fails */ 270 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot open '/etc/hosts' for reading."); /* return the nohostsfile error response */ 271 return -1; 272 } 273 while (fgets(buf, MAX_LINE_SIZE-1, fp)) { /* while looping over the file */ 274 275 pos = strcspn(buf, "#\n\r"); /* find the first comment character or EOL */ 276 *(buf + pos) = '\0'; /* and clobber it and anything that follows it */ 277 278 pos = strspn(buf, " \t"); /* then find the first non-white space */ 279 if (pos == strlen(buf)) /* if there is nothing but white space on the line */ 280 continue; /* ignore that empty line */ 281 ptr = buf + pos; /* and skip over any of that leading whitespace */ 282 283 if ((ptr2 = strstr(ptr, "_I_")) == NULL) /* skip any lines that don't have names that look like they belong to IOPs */ 284 continue; 285 if (*(ptr2 + 4) != '_') /* and skip other lines that have names that don't look like ACN components */ 286 continue; 287 *(ptr + strcspn(ptr, " \t")) = '\0'; /* null terminate the IP address so its a standalone string */ 288 289 chassis = *(ptr2 + 3) - '0'; /* extract the chassis number */ 290 geoslot = *(ptr2 + 5) - '0'; /* and geo-slot number */ 291 if (chassis < 1 || chassis > MAX_CHASSIS || 292 geoslot < 1 || geoslot > MAX_GEOSLOT) { /* if the chassis and/or slot numbers appear to be bad... */ 293 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Invalid ACN name in '/etc/hosts'."); /* warn the user */ 294 continue; /* and ignore the entry */ 295 } 296 if ((ptr2 = (char *)malloc(strlen(ptr) + 1)) == NULL) { 297 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 298 continue; 299 } 300 strcpy(ptr2, ptr); /* copy the IP address into our malloc'ed memory */ 301 u = &units[chassis][geoslot]; 302 u->ip = ptr2; /* and remember the whole shebang */ 303 u->chassis = chassis; 304 u->geoslot = geoslot; 305 } 306 fclose(fp); 307 if (*errbuf) return -1; 308 else return 0; 309 } 310 311 static int open_with_IOP(unit_t *u, int flag) { 312 int sockfd; 313 char *ip; 314 315 if (u->serv_addr == NULL) { 316 u->serv_addr = malloc(sizeof(struct sockaddr_in)); 317 318 /* since we called malloc(), lets check to see if we actually got the memory */ 319 if (u->serv_addr == NULL) { /* oops, we didn't get the memory requested */ 320 fprintf(stderr, "malloc() request for u->serv_addr failed, value of errno is: %d\n", errno); 321 return 0; 322 } 323 324 } 325 ip = u->ip; 326 /* bzero() is deprecated, replaced with memset() */ 327 memset((char *)u->serv_addr, 0, sizeof(struct sockaddr_in)); 328 u->serv_addr->sin_family = AF_INET; 329 u->serv_addr->sin_addr.s_addr = inet_addr(ip); 330 u->serv_addr->sin_port = htons(IOP_SNIFFER_PORT); 331 332 if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { 333 fprintf(stderr, "pcap can't open a socket for connecting to IOP at %s\n", ip); 334 return 0; 335 } 336 if (connect(sockfd, (struct sockaddr *)u->serv_addr, sizeof(struct sockaddr_in)) < 0) { 337 fprintf(stderr, "pcap can't connect to IOP at %s\n", ip); 338 return 0; 339 } 340 if (flag == LIVE) u->fd = sockfd; 341 else u->find_fd = sockfd; 342 u->first_time = 0; 343 return sockfd; /* return the non-zero file descriptor as a 'success' indicator */ 344 } 345 346 static void close_with_IOP(int chassis, int geoslot, int flag) { 347 int *id; 348 349 if (flag == LIVE) id = &units[chassis][geoslot].fd; 350 else id = &units[chassis][geoslot].find_fd; 351 352 if (*id) { /* this was the last time, so... if we are connected... */ 353 close(*id); /* disconnect us */ 354 *id = 0; /* and forget that the descriptor exists because we are not open */ 355 } 356 } 357 358 static void pcap_cleanup_acn(pcap_t *handle) { 359 int chassis, geoslot; 360 unit_t *u; 361 362 if (find_unit_by_fd(handle->fd, &chassis, &geoslot, &u) == 0) 363 return; 364 close_with_IOP(chassis, geoslot, LIVE); 365 if (u) 366 u->first_time = 0; 367 pcap_cleanup_live_common(handle); 368 } 369 370 static void send_to_fd(int fd, int len, unsigned char *str) { 371 int nwritten; 372 int chassis, geoslot; 373 374 while (len > 0) { 375 if ((nwritten = write(fd, str, len)) <= 0) { 376 find_unit_by_fd(fd, &chassis, &geoslot, NULL); 377 if (units[chassis][geoslot].fd == fd) close_with_IOP(chassis, geoslot, LIVE); 378 else if (units[chassis][geoslot].find_fd == fd) close_with_IOP(chassis, geoslot, FIND); 379 empty_unit(chassis, geoslot); 380 return; 381 } 382 len -= nwritten; 383 str += nwritten; 384 } 385 } 386 387 static void acn_freealldevs(void) { 388 389 pcap_if_t *iff, *next_iff; 390 pcap_addr_t *addr, *next_addr; 391 392 for (iff = acn_if_list; iff != NULL; iff = next_iff) { 393 next_iff = iff->next; 394 for (addr = iff->addresses; addr != NULL; addr = next_addr) { 395 next_addr = addr->next; 396 if (addr->addr) free(addr->addr); 397 if (addr->netmask) free(addr->netmask); 398 if (addr->broadaddr) free(addr->broadaddr); 399 if (addr->dstaddr) free(addr->dstaddr); 400 free(addr); 401 } 402 if (iff->name) free(iff->name); 403 if (iff->description) free(iff->description); 404 free(iff); 405 } 406 } 407 408 static void nonUnified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u) { 409 410 snprintf(buf, bufsize, "%s_%d_%d", proto, u->chassis, u->geoslot); 411 } 412 413 static void unified_IOP_port_name(char *buf, size_t bufsize, const char *proto, unit_t *u, int IOPportnum) { 414 int portnum; 415 416 portnum = ((u->chassis - 1) * 64) + ((u->geoslot - 1) * 8) + IOPportnum + 1; 417 snprintf(buf, bufsize, "%s_%d", proto, portnum); 418 } 419 420 static char *translate_IOP_to_pcap_name(unit_t *u, char *IOPname, bpf_u_int32 iftype) { 421 iface_t *iface_ptr, *iface; 422 char *name; 423 char buf[32]; 424 char *proto; 425 char *port; 426 int IOPportnum = 0; 427 428 iface = malloc(sizeof(iface_t)); /* get memory for a structure */ 429 if (iface == NULL) { /* oops, we didn't get the memory requested */ 430 fprintf(stderr, "Error...couldn't allocate memory for interface structure...value of errno is: %d\n", errno); 431 return NULL; 432 } 433 memset((char *)iface, 0, sizeof(iface_t)); /* bzero is deprecated(), replaced with memset() */ 434 435 iface->iftype = iftype; /* remember the interface type of this interface */ 436 437 name = malloc(strlen(IOPname) + 1); /* get memory for the IOP's name */ 438 if (name == NULL) { /* oops, we didn't get the memory requested */ 439 fprintf(stderr, "Error...couldn't allocate memory for IOPname...value of errno is: %d\n", errno); 440 return NULL; 441 } 442 443 strcpy(name, IOPname); /* and copy it in */ 444 iface->IOPname = name; /* and stick it into the structure */ 445 446 if (strncmp(IOPname, "lo", 2) == 0) { 447 IOPportnum = atoi(&IOPname[2]); 448 switch (iftype) { 449 case DLT_EN10MB: 450 nonUnified_IOP_port_name(buf, sizeof buf, "lo", u); 451 break; 452 default: 453 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum); 454 break; 455 } 456 } else if (strncmp(IOPname, "eth", 3) == 0) { 457 IOPportnum = atoi(&IOPname[3]); 458 switch (iftype) { 459 case DLT_EN10MB: 460 nonUnified_IOP_port_name(buf, sizeof buf, "eth", u); 461 break; 462 default: 463 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum); 464 break; 465 } 466 } else if (strncmp(IOPname, "wan", 3) == 0) { 467 IOPportnum = atoi(&IOPname[3]); 468 switch (iftype) { 469 case DLT_SITA: 470 unified_IOP_port_name(buf, sizeof buf, "wan", u, IOPportnum); 471 break; 472 default: 473 unified_IOP_port_name(buf, sizeof buf, "???", u, IOPportnum); 474 break; 475 } 476 } else { 477 fprintf(stderr, "Error... invalid IOP name %s\n", IOPname); 478 return NULL; 479 } 480 481 name = malloc(strlen(buf) + 1); /* get memory for that name */ 482 if (name == NULL) { /* oops, we didn't get the memory requested */ 483 fprintf(stderr, "Error...couldn't allocate memory for IOP port name...value of errno is: %d\n", errno); 484 return NULL; 485 } 486 487 strcpy(name, buf); /* and copy it in */ 488 iface->name = name; /* and stick it into the structure */ 489 490 if (u->iface == 0) { /* if this is the first name */ 491 u->iface = iface; /* stick this entry at the head of the list */ 492 } else { 493 iface_ptr = u->iface; 494 while (iface_ptr->next) { /* othewise scan the list */ 495 iface_ptr = iface_ptr->next; /* till we're at the last entry */ 496 } 497 iface_ptr->next = iface; /* then tack this entry on the end of the list */ 498 } 499 return iface->name; 500 } 501 502 static int if_sort(char *s1, char *s2) { 503 char *s1_p2, *s2_p2; 504 char str1[MAX_LINE_SIZE], str2[MAX_LINE_SIZE]; 505 int s1_p1_len, s2_p1_len; 506 int retval; 507 508 if ((s1_p2 = strchr(s1, '_'))) { /* if an underscore is found... */ 509 s1_p1_len = s1_p2 - s1; /* the prefix length is the difference in pointers */ 510 s1_p2++; /* the suffix actually starts _after_ the underscore */ 511 } else { /* otherwise... */ 512 s1_p1_len = strlen(s1); /* the prefix length is the length of the string itself */ 513 s1_p2 = 0; /* and there is no suffix */ 514 } 515 if ((s2_p2 = strchr(s2, '_'))) { /* now do the same for the second string */ 516 s2_p1_len = s2_p2 - s2; 517 s2_p2++; 518 } else { 519 s2_p1_len = strlen(s2); 520 s2_p2 = 0; 521 } 522 strncpy(str1, s1, (s1_p1_len > sizeof(str1)) ? s1_p1_len : sizeof(str1)); *(str1 + s1_p1_len) = 0; 523 strncpy(str2, s2, (s2_p1_len > sizeof(str2)) ? s2_p1_len : sizeof(str2)); *(str2 + s2_p1_len) = 0; 524 retval = strcmp(str1, str2); 525 if (retval != 0) return retval; /* if they are not identical, then we can quit now and return the indication */ 526 return strcmp(s1_p2, s2_p2); /* otherwise we return the result of comparing the 2nd half of the string */ 527 } 528 529 static void sort_if_table(void) { 530 pcap_if_t *p1, *p2, *prev, *temp; 531 int has_swapped; 532 533 if (!acn_if_list) return; /* nothing to do if the list is empty */ 534 535 while (1) { 536 p1 = acn_if_list; /* start at the head of the list */ 537 prev = 0; 538 has_swapped = 0; 539 while ((p2 = p1->next)) { 540 if (if_sort(p1->name, p2->name) > 0) { 541 if (prev) { /* we are swapping things that are _not_ at the head of the list */ 542 temp = p2->next; 543 prev->next = p2; 544 p2->next = p1; 545 p1->next = temp; 546 } else { /* special treatment if we are swapping with the head of the list */ 547 temp = p2->next; 548 acn_if_list= p2; 549 p2->next = p1; 550 p1->next = temp; 551 } 552 p1 = p2; 553 prev = p1; 554 has_swapped = 1; 555 } 556 prev = p1; 557 p1 = p1->next; 558 } 559 if (has_swapped == 0) 560 return; 561 } 562 return; 563 } 564 565 static int process_client_data (char *errbuf) { /* returns: -1 = error, 0 = OK */ 566 int chassis, geoslot; 567 unit_t *u; 568 pcap_if_t *iff, *prev_iff; 569 pcap_addr_t *addr, *prev_addr; 570 char *ptr; 571 int address_count; 572 struct sockaddr_in *s; 573 char *newname; 574 bpf_u_int32 interfaceType; 575 unsigned char flags; 576 577 prev_iff = 0; 578 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { 579 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { /* now loop over all the devices */ 580 u = &units[chassis][geoslot]; 581 empty_unit_iface(u); 582 ptr = u->imsg; /* point to the start of the msg for this IOP */ 583 while (ptr < (u->imsg + u->len)) { 584 if ((iff = malloc(sizeof(pcap_if_t))) == NULL) { 585 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 586 return -1; 587 } 588 memset((char *)iff, 0, sizeof(pcap_if_t)); /* bzero() is deprecated, replaced with memset() */ 589 if (acn_if_list == 0) acn_if_list = iff; /* remember the head of the list */ 590 if (prev_iff) prev_iff->next = iff; /* insert a forward link */ 591 592 if (*ptr) { /* if there is a count for the name */ 593 if ((iff->name = malloc(*ptr + 1)) == NULL) { /* get that amount of space */ 594 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 595 return -1; 596 } 597 memcpy(iff->name, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */ 598 *(iff->name + *ptr) = 0; /* and null terminate the string */ 599 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */ 600 } 601 ptr++; 602 603 if (*ptr) { /* if there is a count for the description */ 604 if ((iff->description = malloc(*ptr + 1)) == NULL) { /* get that amount of space */ 605 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 606 return -1; 607 } 608 memcpy(iff->description, (ptr + 1), *ptr); /* copy the name into the malloc'ed space */ 609 *(iff->description + *ptr) = 0; /* and null terminate the string */ 610 ptr += *ptr; /* now move the pointer forwards by the length of the count plus the length of the string */ 611 } 612 ptr++; 613 614 interfaceType = ntohl(*(bpf_u_int32 *)ptr); 615 ptr += 4; /* skip over the interface type */ 616 617 flags = *ptr++; 618 if (flags) iff->flags = PCAP_IF_LOOPBACK; /* if this is a loopback style interface, lets mark it as such */ 619 620 address_count = *ptr++; 621 622 prev_addr = 0; 623 while (address_count--) { 624 if ((addr = malloc(sizeof(pcap_addr_t))) == NULL) { 625 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 626 return -1; 627 } 628 + memset((char *)addr, 0, sizeof(pcap_addr_t)); /* bzero() is deprecated, replaced with memset() */ 629 if (iff->addresses == 0) iff->addresses = addr; 630 if (prev_addr) prev_addr->next = addr; /* insert a forward link */ 631 if (*ptr) { /* if there is a count for the address */ 632 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { /* get that amount of space */ 633 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 634 return -1; 635 } 636 memset((char *)s, 0, sizeof(struct sockaddr_in)); /* bzero() is deprecated, replaced with memset() */ 637 addr->addr = (struct sockaddr *)s; 638 s->sin_family = AF_INET; 639 s->sin_addr.s_addr = *(bpf_u_int32 *)(ptr + 1); /* copy the address in */ 640 ptr += *ptr; /* now move the pointer forwards according to the specified length of the address */ 641 } 642 ptr++; /* then forwards one more for the 'length of the address' field */ 643 if (*ptr) { /* process any netmask */ 644 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { 645 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 646 return -1; 647 } 648 /* bzero() is deprecated, replaced with memset() */ 649 memset((char *)s, 0, sizeof(struct sockaddr_in)); 650 651 addr->netmask = (struct sockaddr *)s; 652 s->sin_family = AF_INET; 653 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1); 654 ptr += *ptr; 655 } 656 ptr++; 657 if (*ptr) { /* process any broadcast address */ 658 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { 659 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 660 return -1; 661 } 662 /* bzero() is deprecated, replaced with memset() */ 663 memset((char *)s, 0, sizeof(struct sockaddr_in)); 664 665 addr->broadaddr = (struct sockaddr *)s; 666 s->sin_family = AF_INET; 667 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1); 668 ptr += *ptr; 669 } 670 ptr++; 671 if (*ptr) { /* process any destination address */ 672 if ((s = malloc(sizeof(struct sockaddr_in))) == NULL) { 673 snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); 674 return -1; 675 } 676 /* bzero() is deprecated, replaced with memset() */ 677 memset((char *)s, 0, sizeof(struct sockaddr_in)); 678 679 addr->dstaddr = (struct sockaddr *)s; 680 s->sin_family = AF_INET; 681 s->sin_addr.s_addr = *(bpf_u_int32*)(ptr + 1); 682 ptr += *ptr; 683 } 684 ptr++; 685 prev_addr = addr; 686 } 687 prev_iff = iff; 688 689 newname = translate_IOP_to_pcap_name(u, iff->name, interfaceType); /* add a translation entry and get a point to the mangled name */ 690 if ((iff->name = realloc(iff->name, strlen(newname) + 1)) == NULL) { /* we now re-write the name stored in the interface list */ 691 snprintf(errbuf, PCAP_ERRBUF_SIZE, "realloc: %s", pcap_strerror(errno)); 692 return -1; 693 } 694 strcpy(iff->name, newname); /* to this new name */ 695 } 696 } 697 } 698 return 0; 699 } 700 701 static int read_client_data (int fd) { 702 unsigned char buf[256]; 703 int chassis, geoslot; 704 unit_t *u; 705 int len; 706 707 find_unit_by_fd(fd, &chassis, &geoslot, &u); 708 709 if ((len = recv(fd, buf, sizeof(buf), 0)) <= 0) return 0; /* read in whatever data was sent to us */ 710 711 if ((u->imsg = realloc(u->imsg, (u->len + len))) == NULL) /* extend the buffer for the new data */ 712 return 0; 713 memcpy((u->imsg + u->len), buf, len); /* append the new data */ 714 u->len += len; 715 return 1; 716 } 717 718 static void wait_for_all_answers(void) { 719 int retval; 720 struct timeval tv; 721 int fd; 722 int chassis, geoslot; 723 724 tv.tv_sec = 2; 725 tv.tv_usec = 0; 726 727 while (1) { 728 int flag = 0; 729 fd_set working_set; 730 731 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of descriptors we may be listening to */ 732 if (FD_ISSET(fd, &readfds)) flag = 1; /* and see if there are any still set */ 733 } 734 if (flag == 0) return; /* we are done, when they are all gone */ 735 736 memcpy(&working_set, &readfds, sizeof(readfds)); /* otherwise, we still have to listen for more stuff, till we timeout */ 737 retval = select(max_fs + 1, &working_set, NULL, NULL, &tv); 738 if (retval == -1) { /* an error occured !!!!! */ 739 return; 740 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */ 741 printf("timeout\n"); 742 return; 743 } else { 744 for (fd = 0; fd <= max_fs; fd++) { /* scan the list of things to do, and do them */ 745 if (FD_ISSET(fd, &working_set)) { 746 if (read_client_data(fd) == 0) { /* if the socket has closed */ 747 FD_CLR(fd, &readfds); /* and descriptors we listen to for errors */ 748 find_unit_by_fd(fd, &chassis, &geoslot, NULL); 749 close_with_IOP(chassis, geoslot, FIND); /* and close out connection to him */ 750 } 751 } 752 } 753 } 754 } 755 } 756 757 static char *get_error_response(int fd, char *errbuf) { /* return a pointer on error, NULL on no error */ 758 char byte; 759 int len = 0; 760 761 while (1) { 762 recv(fd, &byte, 1, 0); /* read another byte in */ 763 if (errbuf && (len++ < PCAP_ERRBUF_SIZE)) { /* and if there is still room in the buffer */ 764 *errbuf++ = byte; /* stick it in */ 765 *errbuf = '\0'; /* ensure the string is null terminated just in case we might exceed the buffer's size */ 766 } 767 if (byte == '\0') { 768 if (len > 1) { return errbuf; } 769 else { return NULL; } 770 } 771 } 772 } 773 774 int acn_findalldevs(char *errbuf) { /* returns: -1 = error, 0 = OK */ 775 int chassis, geoslot; 776 unit_t *u; 777 778 FD_ZERO(&readfds); 779 max_fs = 0; 780 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { 781 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 782 u = &units[chassis][geoslot]; 783 if (u->ip && (open_with_IOP(u, FIND))) { /* connect to the remote IOP */ 784 send_to_fd(u->find_fd, 1, (unsigned char *)"\0"); 785 if (get_error_response(u->find_fd, errbuf)) 786 close_with_IOP(chassis, geoslot, FIND); 787 else { 788 if (u->find_fd > max_fs) 789 max_fs = u->find_fd; /* remember the highest number currently in use */ 790 FD_SET(u->find_fd, &readfds); /* we are going to want to read this guy's response to */ 791 u->len = 0; 792 send_to_fd(u->find_fd, 1, (unsigned char *)"Q"); /* this interface query request */ 793 } 794 } 795 } 796 } 797 wait_for_all_answers(); 798 if (process_client_data(errbuf)) 799 return -1; 800 sort_if_table(); 801 return 0; 802 } 803 804 static int pcap_stats_acn(pcap_t *handle, struct pcap_stat *ps) { 805 unsigned char buf[12]; 806 807 send_to_fd(handle->fd, 1, (unsigned char *)"S"); /* send the get_stats command to the IOP */ 808 809 if (read_client_nbytes(handle->fd, sizeof(buf), buf) == -1) return -1; /* try reading the required bytes */ 810 811 ps->ps_recv = ntohl(*(uint32_t *)&buf[0]); /* break the buffer into its three 32 bit components */ 812 ps->ps_drop = ntohl(*(uint32_t *)&buf[4]); 813 ps->ps_ifdrop = ntohl(*(uint32_t *)&buf[8]); 814 815 return 0; 816 } 817 818 static int acn_open_live(const char *name, char *errbuf, int *linktype) { /* returns 0 on error, else returns the file descriptor */ 819 int chassis, geoslot; 820 unit_t *u; 821 iface_t *p; 822 pcap_if_t *alldevsp; 823 824 pcap_findalldevs_interfaces(&alldevsp, errbuf); 825 for (chassis = 0; chassis <= MAX_CHASSIS; chassis++) { /* scan the table... */ 826 for (geoslot = 0; geoslot <= MAX_GEOSLOT; geoslot++) { 827 u = &units[chassis][geoslot]; 828 if (u->ip != NULL) { 829 p = u->iface; 830 while (p) { /* and all interfaces... */ 831 if (p->IOPname && p->name && (strcmp(p->name, name) == 0)) { /* and if we found the interface we want... */ 832 *linktype = p->iftype; 833 open_with_IOP(u, LIVE); /* start a connection with that IOP */ 834 send_to_fd(u->fd, strlen(p->IOPname)+1, (unsigned char *)p->IOPname); /* send the IOP's interface name, and a terminating null */ 835 if (get_error_response(u->fd, errbuf)) { 836 return -1; 837 } 838 return u->fd; /* and return that open descriptor */ 839 } 840 p = p->next; 841 } 842 } 843 } 844 } 845 return -1; /* if the interface wasn't found, return an error */ 846 } 847 848 static void acn_start_monitor(int fd, int snaplen, int timeout, int promiscuous, int direction) { 849 unsigned char buf[8]; 850 unit_t *u; 851 852 //printf("acn_start_monitor()\n"); // fulko 853 find_unit_by_fd(fd, NULL, NULL, &u); 854 if (u->first_time == 0) { 855 buf[0] = 'M'; 856 *(uint32_t *)&buf[1] = htonl(snaplen); 857 buf[5] = timeout; 858 buf[6] = promiscuous; 859 buf[7] = direction; 860 //printf("acn_start_monitor() first time\n"); // fulko 861 send_to_fd(fd, 8, buf); /* send the start monitor command with its parameters to the IOP */ 862 u->first_time = 1; 863 } 864 //printf("acn_start_monitor() complete\n"); // fulko 865 } 866 867 static int pcap_inject_acn(pcap_t *p, const void *buf _U_, size_t size _U_) { 868 strlcpy(p->errbuf, "Sending packets isn't supported on ACN adapters", 869 PCAP_ERRBUF_SIZE); 870 return (-1); 871 } 872 873 static int pcap_setfilter_acn(pcap_t *handle, struct bpf_program *bpf) { 874 int fd = handle->fd; 875 int count; 876 struct bpf_insn *p; 877 uint16_t shortInt; 878 uint32_t longInt; 879 880 send_to_fd(fd, 1, (unsigned char *)"F"); /* BPF filter follows command */ 881 count = bpf->bf_len; 882 longInt = htonl(count); 883 send_to_fd(fd, 4, (unsigned char *)&longInt); /* send the instruction sequence count */ 884 p = bpf->bf_insns; 885 while (count--) { /* followed by the list of instructions */ 886 shortInt = htons(p->code); 887 longInt = htonl(p->k); 888 send_to_fd(fd, 2, (unsigned char *)&shortInt); 889 send_to_fd(fd, 1, (unsigned char *)&p->jt); 890 send_to_fd(fd, 1, (unsigned char *)&p->jf); 891 send_to_fd(fd, 4, (unsigned char *)&longInt); 892 p++; 893 } 894 if (get_error_response(fd, NULL)) 895 return -1; 896 return 0; 897 } 898 899 static int pcap_setdirection_acn(pcap_t *handle, pcap_direction_t d) { 900 snprintf(handle->errbuf, sizeof(handle->errbuf), 901 "Setting direction is not supported on ACN adapters"); 902 return -1; 903 } 904 905 static int acn_read_n_bytes_with_timeout(pcap_t *handle, int count) { 906 struct timeval tv; 907 int retval, fd; 908 fd_set r_fds; 909 fd_set w_fds; 910 u_char *bp; 911 int len = 0; 912 int offset = 0; 913 914 tv.tv_sec = 5; 915 tv.tv_usec = 0; 916 917 fd = handle->fd; 918 FD_ZERO(&r_fds); 919 FD_SET(fd, &r_fds); 920 memcpy(&w_fds, &r_fds, sizeof(r_fds)); 921 bp = handle->bp; 922 while (count) { 923 retval = select(fd + 1, &w_fds, NULL, NULL, &tv); 924 if (retval == -1) { /* an error occured !!!!! */ 925 // fprintf(stderr, "error during packet data read\n"); 926 return -1; /* but we need to return a good indication to prevent unneccessary popups */ 927 } else if (retval == 0) { /* timeout occured, so process what we've got sofar and return */ 928 // fprintf(stderr, "timeout during packet data read\n"); 929 return -1; 930 } else { 931 if ((len = recv(fd, (bp + offset), count, 0)) <= 0) { 932 // fprintf(stderr, "premature exit during packet data rx\n"); 933 return -1; 934 } 935 count -= len; 936 offset += len; 937 } 938 } 939 return 0; 940 } 941 942 static int pcap_read_acn(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) { 943 #define HEADER_SIZE (4 * 4) 944 unsigned char packet_header[HEADER_SIZE]; 945 struct pcap_pkthdr pcap_header; 946 947 //printf("pcap_read_acn()\n"); // fulko 948 acn_start_monitor(handle->fd, handle->snapshot, handle->opt.timeout, handle->opt.promisc, handle->direction); /* maybe tell him to start monitoring */ 949 //printf("pcap_read_acn() after start monitor\n"); // fulko 950 951 handle->bp = packet_header; 952 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 */ 953 954 pcap_header.ts.tv_sec = ntohl(*(uint32_t *)&packet_header[0]); /* tv_sec */ 955 pcap_header.ts.tv_usec = ntohl(*(uint32_t *)&packet_header[4]); /* tv_usec */ 956 pcap_header.caplen = ntohl(*(uint32_t *)&packet_header[8]); /* caplen */ 957 pcap_header.len = ntohl(*(uint32_t *)&packet_header[12]); /* len */ 958 959 handle->bp = handle->buffer + handle->offset; /* start off the receive pointer at the right spot */ 960 if (acn_read_n_bytes_with_timeout(handle, pcap_header.caplen) == -1) return 0; /* then try to read in the rest of the data */ 961 962 callback(user, &pcap_header, handle->bp); /* call the user supplied callback function */ 963 return 1; 964 } 965 966 static int pcap_activate_sita(pcap_t *handle) { 967 int fd; 968 969 if (handle->opt.rfmon) { 970 /* 971 * No monitor mode on SITA devices (they're not Wi-Fi 972 * devices). 973 */ 974 return PCAP_ERROR_RFMON_NOTSUP; 975 } 976 977 /* Initialize some components of the pcap structure. */ 978 979 handle->inject_op = pcap_inject_acn; 980 handle->setfilter_op = pcap_setfilter_acn; 981 handle->setdirection_op = pcap_setdirection_acn; 982 handle->set_datalink_op = NULL; /* can't change data link type */ 983 handle->getnonblock_op = pcap_getnonblock_fd; 984 handle->setnonblock_op = pcap_setnonblock_fd; 985 handle->cleanup_op = pcap_cleanup_acn; 986 handle->read_op = pcap_read_acn; 987 handle->stats_op = pcap_stats_acn; 988 989 fd = acn_open_live(handle->opt.source, handle->errbuf, 990 &handle->linktype); 991 if (fd == -1) 992 return PCAP_ERROR; 993 handle->fd = fd; 994 handle->bufsize = handle->snapshot; 995 996 /* Allocate the buffer */ 997 998 handle->buffer = malloc(handle->bufsize + handle->offset); 999 if (!handle->buffer) { 1000 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, 1001 "malloc: %s", pcap_strerror(errno)); 1002 pcap_cleanup_acn(handle); 1003 return PCAP_ERROR; 1004 } 1005 1006 /* 1007 * "handle->fd" is a socket, so "select()" and "poll()" 1008 * should work on it. 1009 */ 1010 handle->selectable_fd = handle->fd; 1011 1012 return 0; 1013 } 1014 1015 pcap_t *pcap_create_interface(const char *device, char *ebuf) { 1016 pcap_t *p; 1017 1018 p = pcap_create_common(device, ebuf, 0); 1019 if (p == NULL) 1020 return (NULL); 1021 1022 p->activate_op = pcap_activate_sita; 1023 return (p); 1024 } 1025