1 /*
2 * Perform PPPoE discovery
3 *
4 * Copyright (C) 2000-2001 by Roaring Penguin Software Inc.
5 * Copyright (C) 2004 Marco d'Itri <md@linux.it>
6 *
7 * This program may be distributed according to the terms of the GNU
8 * General Public License, version 2 or (at your option) any later version.
9 *
10 */
11
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <unistd.h>
15 #include <errno.h>
16 #include <string.h>
17
18 #include "pppoe.h"
19
20 #ifdef HAVE_UNISTD_H
21 #include <unistd.h>
22 #endif
23
24 #ifdef HAVE_NETPACKET_PACKET_H
25 #include <netpacket/packet.h>
26 #elif defined(HAVE_LINUX_IF_PACKET_H)
27 #include <linux/if_packet.h>
28 #endif
29
30 #ifdef HAVE_NET_ETHERNET_H
31 #include <net/ethernet.h>
32 #endif
33
34 #ifdef HAVE_ASM_TYPES_H
35 #include <asm/types.h>
36 #endif
37
38 #ifdef HAVE_SYS_IOCTL_H
39 #include <sys/ioctl.h>
40 #endif
41
42 #include <errno.h>
43 #include <stdlib.h>
44 #include <string.h>
45
46 #ifdef HAVE_NET_IF_ARP_H
47 #include <net/if_arp.h>
48 #endif
49
50 char *xstrdup(const char *s);
51 void usage(void);
52
die(int status)53 void die(int status)
54 {
55 exit(status);
56 }
57
58 /* Initialize frame types to RFC 2516 values. Some broken peers apparently
59 use different frame types... sigh... */
60
61 UINT16_t Eth_PPPOE_Discovery = ETH_PPPOE_DISCOVERY;
62 UINT16_t Eth_PPPOE_Session = ETH_PPPOE_SESSION;
63
64 /**********************************************************************
65 *%FUNCTION: etherType
66 *%ARGUMENTS:
67 * packet -- a received PPPoE packet
68 *%RETURNS:
69 * ethernet packet type (see /usr/include/net/ethertypes.h)
70 *%DESCRIPTION:
71 * Checks the ethernet packet header to determine its type.
72 * We should only be receveing DISCOVERY and SESSION types if the BPF
73 * is set up correctly. Logs an error if an unexpected type is received.
74 * Note that the ethernet type names come from "pppoe.h" and the packet
75 * packet structure names use the LINUX dialect to maintain consistency
76 * with the rest of this file. See the BSD section of "pppoe.h" for
77 * translations of the data structure names.
78 ***********************************************************************/
79 UINT16_t
etherType(PPPoEPacket * packet)80 etherType(PPPoEPacket *packet)
81 {
82 UINT16_t type = (UINT16_t) ntohs(packet->ethHdr.h_proto);
83 if (type != Eth_PPPOE_Discovery && type != Eth_PPPOE_Session) {
84 fprintf(stderr, "Invalid ether type 0x%x\n", type);
85 }
86 return type;
87 }
88
89 /**********************************************************************
90 *%FUNCTION: openInterface
91 *%ARGUMENTS:
92 * ifname -- name of interface
93 * type -- Ethernet frame type
94 * hwaddr -- if non-NULL, set to the hardware address
95 *%RETURNS:
96 * A raw socket for talking to the Ethernet card. Exits on error.
97 *%DESCRIPTION:
98 * Opens a raw Ethernet socket
99 ***********************************************************************/
100 int
openInterface(char const * ifname,UINT16_t type,unsigned char * hwaddr)101 openInterface(char const *ifname, UINT16_t type, unsigned char *hwaddr)
102 {
103 int optval=1;
104 int fd;
105 struct ifreq ifr;
106 int domain, stype;
107
108 #ifdef HAVE_STRUCT_SOCKADDR_LL
109 struct sockaddr_ll sa;
110 #else
111 struct sockaddr sa;
112 #endif
113
114 memset(&sa, 0, sizeof(sa));
115
116 #ifdef HAVE_STRUCT_SOCKADDR_LL
117 domain = PF_PACKET;
118 stype = SOCK_RAW;
119 #else
120 domain = PF_INET;
121 stype = SOCK_PACKET;
122 #endif
123
124 if ((fd = socket(domain, stype, htons(type))) < 0) {
125 /* Give a more helpful message for the common error case */
126 if (errno == EPERM) {
127 rp_fatal("Cannot create raw socket -- pppoe must be run as root.");
128 }
129 fatalSys("socket");
130 }
131
132 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &optval, sizeof(optval)) < 0) {
133 fatalSys("setsockopt");
134 }
135
136 /* Fill in hardware address */
137 if (hwaddr) {
138 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
139 if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
140 fatalSys("ioctl(SIOCGIFHWADDR)");
141 }
142 memcpy(hwaddr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
143 #ifdef ARPHRD_ETHER
144 if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
145 char buffer[256];
146 sprintf(buffer, "Interface %.16s is not Ethernet", ifname);
147 rp_fatal(buffer);
148 }
149 #endif
150 if (NOT_UNICAST(hwaddr)) {
151 char buffer[256];
152 sprintf(buffer,
153 "Interface %.16s has broadcast/multicast MAC address??",
154 ifname);
155 rp_fatal(buffer);
156 }
157 }
158
159 /* Sanity check on MTU */
160 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
161 if (ioctl(fd, SIOCGIFMTU, &ifr) < 0) {
162 fatalSys("ioctl(SIOCGIFMTU)");
163 }
164 if (ifr.ifr_mtu < ETH_DATA_LEN) {
165 fprintf(stderr, "Interface %.16s has MTU of %d -- should be %d.\n",
166 ifname, ifr.ifr_mtu, ETH_DATA_LEN);
167 fprintf(stderr, "You may have serious connection problems.\n");
168 }
169
170 #ifdef HAVE_STRUCT_SOCKADDR_LL
171 /* Get interface index */
172 sa.sll_family = AF_PACKET;
173 sa.sll_protocol = htons(type);
174
175 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
176 if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) {
177 fatalSys("ioctl(SIOCFIGINDEX): Could not get interface index");
178 }
179 sa.sll_ifindex = ifr.ifr_ifindex;
180
181 #else
182 strcpy(sa.sa_data, ifname);
183 #endif
184
185 /* We're only interested in packets on specified interface */
186 if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
187 fatalSys("bind");
188 }
189
190 return fd;
191 }
192
193
194 /***********************************************************************
195 *%FUNCTION: sendPacket
196 *%ARGUMENTS:
197 * sock -- socket to send to
198 * pkt -- the packet to transmit
199 * size -- size of packet (in bytes)
200 *%RETURNS:
201 * 0 on success; -1 on failure
202 *%DESCRIPTION:
203 * Transmits a packet
204 ***********************************************************************/
205 int
sendPacket(PPPoEConnection * conn,int sock,PPPoEPacket * pkt,int size)206 sendPacket(PPPoEConnection *conn, int sock, PPPoEPacket *pkt, int size)
207 {
208 #if defined(HAVE_STRUCT_SOCKADDR_LL)
209 if (send(sock, pkt, size, 0) < 0) {
210 sysErr("send (sendPacket)");
211 return -1;
212 }
213 #else
214 struct sockaddr sa;
215
216 if (!conn) {
217 rp_fatal("relay and server not supported on Linux 2.0 kernels");
218 }
219 strcpy(sa.sa_data, conn->ifName);
220 if (sendto(sock, pkt, size, 0, &sa, sizeof(sa)) < 0) {
221 sysErr("sendto (sendPacket)");
222 return -1;
223 }
224 #endif
225 return 0;
226 }
227
228 /***********************************************************************
229 *%FUNCTION: receivePacket
230 *%ARGUMENTS:
231 * sock -- socket to read from
232 * pkt -- place to store the received packet
233 * size -- set to size of packet in bytes
234 *%RETURNS:
235 * >= 0 if all OK; < 0 if error
236 *%DESCRIPTION:
237 * Receives a packet
238 ***********************************************************************/
239 int
receivePacket(int sock,PPPoEPacket * pkt,int * size)240 receivePacket(int sock, PPPoEPacket *pkt, int *size)
241 {
242 if ((*size = recv(sock, pkt, sizeof(PPPoEPacket), 0)) < 0) {
243 sysErr("recv (receivePacket)");
244 return -1;
245 }
246 return 0;
247 }
248
249 /**********************************************************************
250 *%FUNCTION: parsePacket
251 *%ARGUMENTS:
252 * packet -- the PPPoE discovery packet to parse
253 * func -- function called for each tag in the packet
254 * extra -- an opaque data pointer supplied to parsing function
255 *%RETURNS:
256 * 0 if everything went well; -1 if there was an error
257 *%DESCRIPTION:
258 * Parses a PPPoE discovery packet, calling "func" for each tag in the packet.
259 * "func" is passed the additional argument "extra".
260 ***********************************************************************/
261 int
parsePacket(PPPoEPacket * packet,ParseFunc * func,void * extra)262 parsePacket(PPPoEPacket *packet, ParseFunc *func, void *extra)
263 {
264 UINT16_t len = ntohs(packet->length);
265 unsigned char *curTag;
266 UINT16_t tagType, tagLen;
267
268 if (PPPOE_VER(packet->vertype) != 1) {
269 fprintf(stderr, "Invalid PPPoE version (%d)\n",
270 PPPOE_VER(packet->vertype));
271 return -1;
272 }
273 if (PPPOE_TYPE(packet->vertype) != 1) {
274 fprintf(stderr, "Invalid PPPoE type (%d)\n",
275 PPPOE_TYPE(packet->vertype));
276 return -1;
277 }
278
279 /* Do some sanity checks on packet */
280 if (len > ETH_JUMBO_LEN - PPPOE_OVERHEAD) { /* 6-byte overhead for PPPoE header */
281 fprintf(stderr, "Invalid PPPoE packet length (%u)\n", len);
282 return -1;
283 }
284
285 /* Step through the tags */
286 curTag = packet->payload;
287 while(curTag - packet->payload < len) {
288 /* Alignment is not guaranteed, so do this by hand... */
289 tagType = (curTag[0] << 8) + curTag[1];
290 tagLen = (curTag[2] << 8) + curTag[3];
291 if (tagType == TAG_END_OF_LIST) {
292 return 0;
293 }
294 if ((curTag - packet->payload) + tagLen + TAG_HDR_SIZE > len) {
295 fprintf(stderr, "Invalid PPPoE tag length (%u)\n", tagLen);
296 return -1;
297 }
298 func(tagType, tagLen, curTag+TAG_HDR_SIZE, extra);
299 curTag = curTag + TAG_HDR_SIZE + tagLen;
300 }
301 return 0;
302 }
303
304 /**********************************************************************
305 *%FUNCTION: parseForHostUniq
306 *%ARGUMENTS:
307 * type -- tag type
308 * len -- tag length
309 * data -- tag data.
310 * extra -- user-supplied pointer. This is assumed to be a pointer to int.
311 *%RETURNS:
312 * Nothing
313 *%DESCRIPTION:
314 * If a HostUnique tag is found which matches our PID, sets *extra to 1.
315 ***********************************************************************/
316 void
parseForHostUniq(UINT16_t type,UINT16_t len,unsigned char * data,void * extra)317 parseForHostUniq(UINT16_t type, UINT16_t len, unsigned char *data,
318 void *extra)
319 {
320 int *val = (int *) extra;
321 if (type == TAG_HOST_UNIQ && len == sizeof(pid_t)) {
322 pid_t tmp;
323 memcpy(&tmp, data, len);
324 if (tmp == getpid()) {
325 *val = 1;
326 }
327 }
328 }
329
330 /**********************************************************************
331 *%FUNCTION: packetIsForMe
332 *%ARGUMENTS:
333 * conn -- PPPoE connection info
334 * packet -- a received PPPoE packet
335 *%RETURNS:
336 * 1 if packet is for this PPPoE daemon; 0 otherwise.
337 *%DESCRIPTION:
338 * If we are using the Host-Unique tag, verifies that packet contains
339 * our unique identifier.
340 ***********************************************************************/
341 int
packetIsForMe(PPPoEConnection * conn,PPPoEPacket * packet)342 packetIsForMe(PPPoEConnection *conn, PPPoEPacket *packet)
343 {
344 int forMe = 0;
345
346 /* If packet is not directed to our MAC address, forget it */
347 if (memcmp(packet->ethHdr.h_dest, conn->myEth, ETH_ALEN)) return 0;
348
349 /* If we're not using the Host-Unique tag, then accept the packet */
350 if (!conn->useHostUniq) return 1;
351
352 parsePacket(packet, parseForHostUniq, &forMe);
353 return forMe;
354 }
355
356 /**********************************************************************
357 *%FUNCTION: parsePADOTags
358 *%ARGUMENTS:
359 * type -- tag type
360 * len -- tag length
361 * data -- tag data
362 * extra -- extra user data. Should point to a PacketCriteria structure
363 * which gets filled in according to selected AC name and service
364 * name.
365 *%RETURNS:
366 * Nothing
367 *%DESCRIPTION:
368 * Picks interesting tags out of a PADO packet
369 ***********************************************************************/
370 void
parsePADOTags(UINT16_t type,UINT16_t len,unsigned char * data,void * extra)371 parsePADOTags(UINT16_t type, UINT16_t len, unsigned char *data,
372 void *extra)
373 {
374 struct PacketCriteria *pc = (struct PacketCriteria *) extra;
375 PPPoEConnection *conn = pc->conn;
376 int i;
377
378 switch(type) {
379 case TAG_AC_NAME:
380 pc->seenACName = 1;
381 printf("Access-Concentrator: %.*s\n", (int) len, data);
382 if (conn->acName && len == strlen(conn->acName) &&
383 !strncmp((char *) data, conn->acName, len)) {
384 pc->acNameOK = 1;
385 }
386 break;
387 case TAG_SERVICE_NAME:
388 pc->seenServiceName = 1;
389 if (len > 0) {
390 printf(" Service-Name: %.*s\n", (int) len, data);
391 }
392 if (conn->serviceName && len == strlen(conn->serviceName) &&
393 !strncmp((char *) data, conn->serviceName, len)) {
394 pc->serviceNameOK = 1;
395 }
396 break;
397 case TAG_AC_COOKIE:
398 printf("Got a cookie:");
399 /* Print first 20 bytes of cookie */
400 for (i=0; i<len && i < 20; i++) {
401 printf(" %02x", (unsigned) data[i]);
402 }
403 if (i < len) printf("...");
404 printf("\n");
405 conn->cookie.type = htons(type);
406 conn->cookie.length = htons(len);
407 memcpy(conn->cookie.payload, data, len);
408 break;
409 case TAG_RELAY_SESSION_ID:
410 printf("Got a Relay-ID:");
411 /* Print first 20 bytes of relay ID */
412 for (i=0; i<len && i < 20; i++) {
413 printf(" %02x", (unsigned) data[i]);
414 }
415 if (i < len) printf("...");
416 printf("\n");
417 conn->relayId.type = htons(type);
418 conn->relayId.length = htons(len);
419 memcpy(conn->relayId.payload, data, len);
420 break;
421 case TAG_SERVICE_NAME_ERROR:
422 printf("Got a Service-Name-Error tag: %.*s\n", (int) len, data);
423 break;
424 case TAG_AC_SYSTEM_ERROR:
425 printf("Got a System-Error tag: %.*s\n", (int) len, data);
426 break;
427 case TAG_GENERIC_ERROR:
428 printf("Got a Generic-Error tag: %.*s\n", (int) len, data);
429 break;
430 }
431 }
432
433 /***********************************************************************
434 *%FUNCTION: sendPADI
435 *%ARGUMENTS:
436 * conn -- PPPoEConnection structure
437 *%RETURNS:
438 * Nothing
439 *%DESCRIPTION:
440 * Sends a PADI packet
441 ***********************************************************************/
442 void
sendPADI(PPPoEConnection * conn)443 sendPADI(PPPoEConnection *conn)
444 {
445 PPPoEPacket packet;
446 unsigned char *cursor = packet.payload;
447 PPPoETag *svc = (PPPoETag *) (&packet.payload);
448 UINT16_t namelen = 0;
449 UINT16_t plen;
450
451 if (conn->serviceName) {
452 namelen = (UINT16_t) strlen(conn->serviceName);
453 }
454 plen = TAG_HDR_SIZE + namelen;
455 CHECK_ROOM(cursor, packet.payload, plen);
456
457 /* Set destination to Ethernet broadcast address */
458 memset(packet.ethHdr.h_dest, 0xFF, ETH_ALEN);
459 memcpy(packet.ethHdr.h_source, conn->myEth, ETH_ALEN);
460
461 packet.ethHdr.h_proto = htons(Eth_PPPOE_Discovery);
462 packet.vertype = PPPOE_VER_TYPE(1, 1);
463 packet.code = CODE_PADI;
464 packet.session = 0;
465
466 svc->type = TAG_SERVICE_NAME;
467 svc->length = htons(namelen);
468 CHECK_ROOM(cursor, packet.payload, namelen+TAG_HDR_SIZE);
469
470 if (conn->serviceName) {
471 memcpy(svc->payload, conn->serviceName, strlen(conn->serviceName));
472 }
473 cursor += namelen + TAG_HDR_SIZE;
474
475 /* If we're using Host-Uniq, copy it over */
476 if (conn->useHostUniq) {
477 PPPoETag hostUniq;
478 pid_t pid = getpid();
479 hostUniq.type = htons(TAG_HOST_UNIQ);
480 hostUniq.length = htons(sizeof(pid));
481 memcpy(hostUniq.payload, &pid, sizeof(pid));
482 CHECK_ROOM(cursor, packet.payload, sizeof(pid) + TAG_HDR_SIZE);
483 memcpy(cursor, &hostUniq, sizeof(pid) + TAG_HDR_SIZE);
484 cursor += sizeof(pid) + TAG_HDR_SIZE;
485 plen += sizeof(pid) + TAG_HDR_SIZE;
486 }
487
488 packet.length = htons(plen);
489
490 sendPacket(conn, conn->discoverySocket, &packet, (int) (plen + HDR_SIZE));
491 if (conn->debugFile) {
492 dumpPacket(conn->debugFile, &packet, "SENT");
493 fprintf(conn->debugFile, "\n");
494 fflush(conn->debugFile);
495 }
496 }
497
498 /**********************************************************************
499 *%FUNCTION: waitForPADO
500 *%ARGUMENTS:
501 * conn -- PPPoEConnection structure
502 * timeout -- how long to wait (in seconds)
503 *%RETURNS:
504 * Nothing
505 *%DESCRIPTION:
506 * Waits for a PADO packet and copies useful information
507 ***********************************************************************/
508 void
waitForPADO(PPPoEConnection * conn,int timeout)509 waitForPADO(PPPoEConnection *conn, int timeout)
510 {
511 fd_set readable;
512 int r;
513 struct timeval tv;
514 PPPoEPacket packet;
515 int len;
516
517 struct PacketCriteria pc;
518 pc.conn = conn;
519 pc.acNameOK = (conn->acName) ? 0 : 1;
520 pc.serviceNameOK = (conn->serviceName) ? 0 : 1;
521 pc.seenACName = 0;
522 pc.seenServiceName = 0;
523 conn->error = 0;
524
525 do {
526 if (BPF_BUFFER_IS_EMPTY) {
527 tv.tv_sec = timeout;
528 tv.tv_usec = 0;
529
530 FD_ZERO(&readable);
531 FD_SET(conn->discoverySocket, &readable);
532
533 while(1) {
534 r = select(conn->discoverySocket+1, &readable, NULL, NULL, &tv);
535 if (r >= 0 || errno != EINTR) break;
536 }
537 if (r < 0) {
538 perror("select (waitForPADO)");
539 return;
540 }
541 if (r == 0) return; /* Timed out */
542 }
543
544 /* Get the packet */
545 receivePacket(conn->discoverySocket, &packet, &len);
546
547 /* Check length */
548 if (ntohs(packet.length) + HDR_SIZE > len) {
549 fprintf(stderr, "Bogus PPPoE length field (%u)\n",
550 (unsigned int) ntohs(packet.length));
551 continue;
552 }
553
554 #ifdef USE_BPF
555 /* If it's not a Discovery packet, loop again */
556 if (etherType(&packet) != Eth_PPPOE_Discovery) continue;
557 #endif
558
559 if (conn->debugFile) {
560 dumpPacket(conn->debugFile, &packet, "RCVD");
561 fprintf(conn->debugFile, "\n");
562 fflush(conn->debugFile);
563 }
564 /* If it's not for us, loop again */
565 if (!packetIsForMe(conn, &packet)) continue;
566
567 if (packet.code == CODE_PADO) {
568 if (BROADCAST(packet.ethHdr.h_source)) {
569 fprintf(stderr, "Ignoring PADO packet from broadcast MAC address\n");
570 continue;
571 }
572 parsePacket(&packet, parsePADOTags, &pc);
573 if (conn->error)
574 return;
575 if (!pc.seenACName) {
576 fprintf(stderr, "Ignoring PADO packet with no AC-Name tag\n");
577 continue;
578 }
579 if (!pc.seenServiceName) {
580 fprintf(stderr, "Ignoring PADO packet with no Service-Name tag\n");
581 continue;
582 }
583 conn->numPADOs++;
584 printf("--------------------------------------------------\n");
585 if (pc.acNameOK && pc.serviceNameOK) {
586 memcpy(conn->peerEth, packet.ethHdr.h_source, ETH_ALEN);
587 if (conn->printACNames) {
588 printf("AC-Ethernet-Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
589 (unsigned) conn->peerEth[0],
590 (unsigned) conn->peerEth[1],
591 (unsigned) conn->peerEth[2],
592 (unsigned) conn->peerEth[3],
593 (unsigned) conn->peerEth[4],
594 (unsigned) conn->peerEth[5]);
595 continue;
596 }
597 conn->discoveryState = STATE_RECEIVED_PADO;
598 break;
599 }
600 }
601 } while (conn->discoveryState != STATE_RECEIVED_PADO);
602 }
603
604 /**********************************************************************
605 *%FUNCTION: discovery
606 *%ARGUMENTS:
607 * conn -- PPPoE connection info structure
608 *%RETURNS:
609 * Nothing
610 *%DESCRIPTION:
611 * Performs the PPPoE discovery phase
612 ***********************************************************************/
613 void
discovery(PPPoEConnection * conn)614 discovery(PPPoEConnection *conn)
615 {
616 int padiAttempts = 0;
617 int timeout = PADI_TIMEOUT;
618
619 conn->discoverySocket =
620 openInterface(conn->ifName, Eth_PPPOE_Discovery, conn->myEth);
621
622 do {
623 padiAttempts++;
624 if (padiAttempts > MAX_PADI_ATTEMPTS) {
625 fprintf(stderr, "Timeout waiting for PADO packets\n");
626 close(conn->discoverySocket);
627 conn->discoverySocket = -1;
628 return;
629 }
630 sendPADI(conn);
631 conn->discoveryState = STATE_SENT_PADI;
632 waitForPADO(conn, timeout);
633 } while (!conn->numPADOs);
634 }
635
main(int argc,char * argv[])636 int main(int argc, char *argv[])
637 {
638 int opt;
639 PPPoEConnection *conn;
640
641 conn = malloc(sizeof(PPPoEConnection));
642 if (!conn)
643 fatalSys("malloc");
644
645 memset(conn, 0, sizeof(PPPoEConnection));
646
647 while ((opt = getopt(argc, argv, "I:D:VUAS:C:h")) > 0) {
648 switch(opt) {
649 case 'S':
650 conn->serviceName = xstrdup(optarg);
651 break;
652 case 'C':
653 conn->acName = xstrdup(optarg);
654 break;
655 case 'U':
656 conn->useHostUniq = 1;
657 break;
658 case 'D':
659 conn->debugFile = fopen(optarg, "w");
660 if (!conn->debugFile) {
661 fprintf(stderr, "Could not open %s: %s\n",
662 optarg, strerror(errno));
663 exit(1);
664 }
665 fprintf(conn->debugFile, "pppoe-discovery %s\n", RP_VERSION);
666 break;
667 case 'I':
668 conn->ifName = xstrdup(optarg);
669 break;
670 case 'A':
671 /* this is the default */
672 break;
673 case 'V':
674 case 'h':
675 usage();
676 exit(0);
677 default:
678 usage();
679 exit(1);
680 }
681 }
682
683 /* default interface name */
684 if (!conn->ifName)
685 conn->ifName = strdup("eth0");
686
687 conn->discoverySocket = -1;
688 conn->sessionSocket = -1;
689 conn->printACNames = 1;
690
691 discovery(conn);
692 exit(0);
693 }
694
rp_fatal(char const * str)695 void rp_fatal(char const *str)
696 {
697 fprintf(stderr, "%s\n", str);
698 exit(1);
699 }
700
fatalSys(char const * str)701 void fatalSys(char const *str)
702 {
703 perror(str);
704 exit(1);
705 }
706
sysErr(char const * str)707 void sysErr(char const *str)
708 {
709 rp_fatal(str);
710 }
711
xstrdup(const char * s)712 char *xstrdup(const char *s)
713 {
714 register char *ret = strdup(s);
715 if (!ret)
716 sysErr("strdup");
717 return ret;
718 }
719
usage(void)720 void usage(void)
721 {
722 fprintf(stderr, "Usage: pppoe-discovery [options]\n");
723 fprintf(stderr, "\nVersion " RP_VERSION "\n");
724 }
725