| /* |
| * Perform PPPoE discovery |
| * |
| * Copyright (C) 2000-2001 by Roaring Penguin Software Inc. |
| * Copyright (C) 2004 Marco d'Itri <md@linux.it> |
| * |
| * This program may be distributed according to the terms of the GNU |
| * General Public License, version 2 or (at your option) any later version. |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <string.h> |
| |
| #include "pppoe.h" |
| |
| #ifdef HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| |
| #ifdef HAVE_NETPACKET_PACKET_H |
| #include <netpacket/packet.h> |
| #elif defined(HAVE_LINUX_IF_PACKET_H) |
| #include <linux/if_packet.h> |
| #endif |
| |
| #ifdef HAVE_NET_ETHERNET_H |
| #include <net/ethernet.h> |
| #endif |
| |
| #ifdef HAVE_ASM_TYPES_H |
| #include <asm/types.h> |
| #endif |
| |
| #ifdef HAVE_SYS_IOCTL_H |
| #include <sys/ioctl.h> |
| #endif |
| |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #ifdef HAVE_NET_IF_ARP_H |
| #include <net/if_arp.h> |
| #endif |
| |
| char *xstrdup(const char *s); |
| void usage(void); |
| |
| void die(int status) |
| { |
| exit(status); |
| } |
| |
| /* Initialize frame types to RFC 2516 values. Some broken peers apparently |
| use different frame types... sigh... */ |
| |
| UINT16_t Eth_PPPOE_Discovery = ETH_PPPOE_DISCOVERY; |
| UINT16_t Eth_PPPOE_Session = ETH_PPPOE_SESSION; |
| |
| /********************************************************************** |
| *%FUNCTION: etherType |
| *%ARGUMENTS: |
| * packet -- a received PPPoE packet |
| *%RETURNS: |
| * ethernet packet type (see /usr/include/net/ethertypes.h) |
| *%DESCRIPTION: |
| * Checks the ethernet packet header to determine its type. |
| * We should only be receveing DISCOVERY and SESSION types if the BPF |
| * is set up correctly. Logs an error if an unexpected type is received. |
| * Note that the ethernet type names come from "pppoe.h" and the packet |
| * packet structure names use the LINUX dialect to maintain consistency |
| * with the rest of this file. See the BSD section of "pppoe.h" for |
| * translations of the data structure names. |
| ***********************************************************************/ |
| UINT16_t |
| etherType(PPPoEPacket *packet) |
| { |
| UINT16_t type = (UINT16_t) ntohs(packet->ethHdr.h_proto); |
| if (type != Eth_PPPOE_Discovery && type != Eth_PPPOE_Session) { |
| fprintf(stderr, "Invalid ether type 0x%x\n", type); |
| } |
| return type; |
| } |
| |
| /********************************************************************** |
| *%FUNCTION: openInterface |
| *%ARGUMENTS: |
| * ifname -- name of interface |
| * type -- Ethernet frame type |
| * hwaddr -- if non-NULL, set to the hardware address |
| *%RETURNS: |
| * A raw socket for talking to the Ethernet card. Exits on error. |
| *%DESCRIPTION: |
| * Opens a raw Ethernet socket |
| ***********************************************************************/ |
| int |
| openInterface(char const *ifname, UINT16_t type, unsigned char *hwaddr) |
| { |
| int optval=1; |
| int fd; |
| struct ifreq ifr; |
| int domain, stype; |
| |
| #ifdef HAVE_STRUCT_SOCKADDR_LL |
| struct sockaddr_ll sa; |
| #else |
| struct sockaddr sa; |
| #endif |
| |
| memset(&sa, 0, sizeof(sa)); |
| |
| #ifdef HAVE_STRUCT_SOCKADDR_LL |
| domain = PF_PACKET; |
| stype = SOCK_RAW; |
| #else |
| domain = PF_INET; |
| stype = SOCK_PACKET; |
| #endif |
| |
| if ((fd = socket(domain, stype, htons(type))) < 0) { |
| /* Give a more helpful message for the common error case */ |
| if (errno == EPERM) { |
| rp_fatal("Cannot create raw socket -- pppoe must be run as root."); |
| } |
| fatalSys("socket"); |
| } |
| |
| if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &optval, sizeof(optval)) < 0) { |
| fatalSys("setsockopt"); |
| } |
| |
| /* Fill in hardware address */ |
| if (hwaddr) { |
| strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); |
| if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) { |
| fatalSys("ioctl(SIOCGIFHWADDR)"); |
| } |
| memcpy(hwaddr, ifr.ifr_hwaddr.sa_data, ETH_ALEN); |
| #ifdef ARPHRD_ETHER |
| if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) { |
| char buffer[256]; |
| sprintf(buffer, "Interface %.16s is not Ethernet", ifname); |
| rp_fatal(buffer); |
| } |
| #endif |
| if (NOT_UNICAST(hwaddr)) { |
| char buffer[256]; |
| sprintf(buffer, |
| "Interface %.16s has broadcast/multicast MAC address??", |
| ifname); |
| rp_fatal(buffer); |
| } |
| } |
| |
| /* Sanity check on MTU */ |
| strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); |
| if (ioctl(fd, SIOCGIFMTU, &ifr) < 0) { |
| fatalSys("ioctl(SIOCGIFMTU)"); |
| } |
| if (ifr.ifr_mtu < ETH_DATA_LEN) { |
| fprintf(stderr, "Interface %.16s has MTU of %d -- should be %d.\n", |
| ifname, ifr.ifr_mtu, ETH_DATA_LEN); |
| fprintf(stderr, "You may have serious connection problems.\n"); |
| } |
| |
| #ifdef HAVE_STRUCT_SOCKADDR_LL |
| /* Get interface index */ |
| sa.sll_family = AF_PACKET; |
| sa.sll_protocol = htons(type); |
| |
| strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); |
| if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) { |
| fatalSys("ioctl(SIOCFIGINDEX): Could not get interface index"); |
| } |
| sa.sll_ifindex = ifr.ifr_ifindex; |
| |
| #else |
| strcpy(sa.sa_data, ifname); |
| #endif |
| |
| /* We're only interested in packets on specified interface */ |
| if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) { |
| fatalSys("bind"); |
| } |
| |
| return fd; |
| } |
| |
| |
| /*********************************************************************** |
| *%FUNCTION: sendPacket |
| *%ARGUMENTS: |
| * sock -- socket to send to |
| * pkt -- the packet to transmit |
| * size -- size of packet (in bytes) |
| *%RETURNS: |
| * 0 on success; -1 on failure |
| *%DESCRIPTION: |
| * Transmits a packet |
| ***********************************************************************/ |
| int |
| sendPacket(PPPoEConnection *conn, int sock, PPPoEPacket *pkt, int size) |
| { |
| #if defined(HAVE_STRUCT_SOCKADDR_LL) |
| if (send(sock, pkt, size, 0) < 0) { |
| sysErr("send (sendPacket)"); |
| return -1; |
| } |
| #else |
| struct sockaddr sa; |
| |
| if (!conn) { |
| rp_fatal("relay and server not supported on Linux 2.0 kernels"); |
| } |
| strcpy(sa.sa_data, conn->ifName); |
| if (sendto(sock, pkt, size, 0, &sa, sizeof(sa)) < 0) { |
| sysErr("sendto (sendPacket)"); |
| return -1; |
| } |
| #endif |
| return 0; |
| } |
| |
| /*********************************************************************** |
| *%FUNCTION: receivePacket |
| *%ARGUMENTS: |
| * sock -- socket to read from |
| * pkt -- place to store the received packet |
| * size -- set to size of packet in bytes |
| *%RETURNS: |
| * >= 0 if all OK; < 0 if error |
| *%DESCRIPTION: |
| * Receives a packet |
| ***********************************************************************/ |
| int |
| receivePacket(int sock, PPPoEPacket *pkt, int *size) |
| { |
| if ((*size = recv(sock, pkt, sizeof(PPPoEPacket), 0)) < 0) { |
| sysErr("recv (receivePacket)"); |
| return -1; |
| } |
| return 0; |
| } |
| |
| /********************************************************************** |
| *%FUNCTION: parsePacket |
| *%ARGUMENTS: |
| * packet -- the PPPoE discovery packet to parse |
| * func -- function called for each tag in the packet |
| * extra -- an opaque data pointer supplied to parsing function |
| *%RETURNS: |
| * 0 if everything went well; -1 if there was an error |
| *%DESCRIPTION: |
| * Parses a PPPoE discovery packet, calling "func" for each tag in the packet. |
| * "func" is passed the additional argument "extra". |
| ***********************************************************************/ |
| int |
| parsePacket(PPPoEPacket *packet, ParseFunc *func, void *extra) |
| { |
| UINT16_t len = ntohs(packet->length); |
| unsigned char *curTag; |
| UINT16_t tagType, tagLen; |
| |
| if (PPPOE_VER(packet->vertype) != 1) { |
| fprintf(stderr, "Invalid PPPoE version (%d)\n", |
| PPPOE_VER(packet->vertype)); |
| return -1; |
| } |
| if (PPPOE_TYPE(packet->vertype) != 1) { |
| fprintf(stderr, "Invalid PPPoE type (%d)\n", |
| PPPOE_TYPE(packet->vertype)); |
| return -1; |
| } |
| |
| /* Do some sanity checks on packet */ |
| if (len > ETH_JUMBO_LEN - PPPOE_OVERHEAD) { /* 6-byte overhead for PPPoE header */ |
| fprintf(stderr, "Invalid PPPoE packet length (%u)\n", len); |
| return -1; |
| } |
| |
| /* Step through the tags */ |
| curTag = packet->payload; |
| while(curTag - packet->payload < len) { |
| /* Alignment is not guaranteed, so do this by hand... */ |
| tagType = (curTag[0] << 8) + curTag[1]; |
| tagLen = (curTag[2] << 8) + curTag[3]; |
| if (tagType == TAG_END_OF_LIST) { |
| return 0; |
| } |
| if ((curTag - packet->payload) + tagLen + TAG_HDR_SIZE > len) { |
| fprintf(stderr, "Invalid PPPoE tag length (%u)\n", tagLen); |
| return -1; |
| } |
| func(tagType, tagLen, curTag+TAG_HDR_SIZE, extra); |
| curTag = curTag + TAG_HDR_SIZE + tagLen; |
| } |
| return 0; |
| } |
| |
| /********************************************************************** |
| *%FUNCTION: parseForHostUniq |
| *%ARGUMENTS: |
| * type -- tag type |
| * len -- tag length |
| * data -- tag data. |
| * extra -- user-supplied pointer. This is assumed to be a pointer to int. |
| *%RETURNS: |
| * Nothing |
| *%DESCRIPTION: |
| * If a HostUnique tag is found which matches our PID, sets *extra to 1. |
| ***********************************************************************/ |
| void |
| parseForHostUniq(UINT16_t type, UINT16_t len, unsigned char *data, |
| void *extra) |
| { |
| int *val = (int *) extra; |
| if (type == TAG_HOST_UNIQ && len == sizeof(pid_t)) { |
| pid_t tmp; |
| memcpy(&tmp, data, len); |
| if (tmp == getpid()) { |
| *val = 1; |
| } |
| } |
| } |
| |
| /********************************************************************** |
| *%FUNCTION: packetIsForMe |
| *%ARGUMENTS: |
| * conn -- PPPoE connection info |
| * packet -- a received PPPoE packet |
| *%RETURNS: |
| * 1 if packet is for this PPPoE daemon; 0 otherwise. |
| *%DESCRIPTION: |
| * If we are using the Host-Unique tag, verifies that packet contains |
| * our unique identifier. |
| ***********************************************************************/ |
| int |
| packetIsForMe(PPPoEConnection *conn, PPPoEPacket *packet) |
| { |
| int forMe = 0; |
| |
| /* If packet is not directed to our MAC address, forget it */ |
| if (memcmp(packet->ethHdr.h_dest, conn->myEth, ETH_ALEN)) return 0; |
| |
| /* If we're not using the Host-Unique tag, then accept the packet */ |
| if (!conn->useHostUniq) return 1; |
| |
| parsePacket(packet, parseForHostUniq, &forMe); |
| return forMe; |
| } |
| |
| /********************************************************************** |
| *%FUNCTION: parsePADOTags |
| *%ARGUMENTS: |
| * type -- tag type |
| * len -- tag length |
| * data -- tag data |
| * extra -- extra user data. Should point to a PacketCriteria structure |
| * which gets filled in according to selected AC name and service |
| * name. |
| *%RETURNS: |
| * Nothing |
| *%DESCRIPTION: |
| * Picks interesting tags out of a PADO packet |
| ***********************************************************************/ |
| void |
| parsePADOTags(UINT16_t type, UINT16_t len, unsigned char *data, |
| void *extra) |
| { |
| struct PacketCriteria *pc = (struct PacketCriteria *) extra; |
| PPPoEConnection *conn = pc->conn; |
| int i; |
| |
| switch(type) { |
| case TAG_AC_NAME: |
| pc->seenACName = 1; |
| printf("Access-Concentrator: %.*s\n", (int) len, data); |
| if (conn->acName && len == strlen(conn->acName) && |
| !strncmp((char *) data, conn->acName, len)) { |
| pc->acNameOK = 1; |
| } |
| break; |
| case TAG_SERVICE_NAME: |
| pc->seenServiceName = 1; |
| if (len > 0) { |
| printf(" Service-Name: %.*s\n", (int) len, data); |
| } |
| if (conn->serviceName && len == strlen(conn->serviceName) && |
| !strncmp((char *) data, conn->serviceName, len)) { |
| pc->serviceNameOK = 1; |
| } |
| break; |
| case TAG_AC_COOKIE: |
| printf("Got a cookie:"); |
| /* Print first 20 bytes of cookie */ |
| for (i=0; i<len && i < 20; i++) { |
| printf(" %02x", (unsigned) data[i]); |
| } |
| if (i < len) printf("..."); |
| printf("\n"); |
| conn->cookie.type = htons(type); |
| conn->cookie.length = htons(len); |
| memcpy(conn->cookie.payload, data, len); |
| break; |
| case TAG_RELAY_SESSION_ID: |
| printf("Got a Relay-ID:"); |
| /* Print first 20 bytes of relay ID */ |
| for (i=0; i<len && i < 20; i++) { |
| printf(" %02x", (unsigned) data[i]); |
| } |
| if (i < len) printf("..."); |
| printf("\n"); |
| conn->relayId.type = htons(type); |
| conn->relayId.length = htons(len); |
| memcpy(conn->relayId.payload, data, len); |
| break; |
| case TAG_SERVICE_NAME_ERROR: |
| printf("Got a Service-Name-Error tag: %.*s\n", (int) len, data); |
| break; |
| case TAG_AC_SYSTEM_ERROR: |
| printf("Got a System-Error tag: %.*s\n", (int) len, data); |
| break; |
| case TAG_GENERIC_ERROR: |
| printf("Got a Generic-Error tag: %.*s\n", (int) len, data); |
| break; |
| } |
| } |
| |
| /*********************************************************************** |
| *%FUNCTION: sendPADI |
| *%ARGUMENTS: |
| * conn -- PPPoEConnection structure |
| *%RETURNS: |
| * Nothing |
| *%DESCRIPTION: |
| * Sends a PADI packet |
| ***********************************************************************/ |
| void |
| sendPADI(PPPoEConnection *conn) |
| { |
| PPPoEPacket packet; |
| unsigned char *cursor = packet.payload; |
| PPPoETag *svc = (PPPoETag *) (&packet.payload); |
| UINT16_t namelen = 0; |
| UINT16_t plen; |
| |
| if (conn->serviceName) { |
| namelen = (UINT16_t) strlen(conn->serviceName); |
| } |
| plen = TAG_HDR_SIZE + namelen; |
| CHECK_ROOM(cursor, packet.payload, plen); |
| |
| /* Set destination to Ethernet broadcast address */ |
| memset(packet.ethHdr.h_dest, 0xFF, ETH_ALEN); |
| memcpy(packet.ethHdr.h_source, conn->myEth, ETH_ALEN); |
| |
| packet.ethHdr.h_proto = htons(Eth_PPPOE_Discovery); |
| packet.vertype = PPPOE_VER_TYPE(1, 1); |
| packet.code = CODE_PADI; |
| packet.session = 0; |
| |
| svc->type = TAG_SERVICE_NAME; |
| svc->length = htons(namelen); |
| CHECK_ROOM(cursor, packet.payload, namelen+TAG_HDR_SIZE); |
| |
| if (conn->serviceName) { |
| memcpy(svc->payload, conn->serviceName, strlen(conn->serviceName)); |
| } |
| cursor += namelen + TAG_HDR_SIZE; |
| |
| /* If we're using Host-Uniq, copy it over */ |
| if (conn->useHostUniq) { |
| PPPoETag hostUniq; |
| pid_t pid = getpid(); |
| hostUniq.type = htons(TAG_HOST_UNIQ); |
| hostUniq.length = htons(sizeof(pid)); |
| memcpy(hostUniq.payload, &pid, sizeof(pid)); |
| CHECK_ROOM(cursor, packet.payload, sizeof(pid) + TAG_HDR_SIZE); |
| memcpy(cursor, &hostUniq, sizeof(pid) + TAG_HDR_SIZE); |
| cursor += sizeof(pid) + TAG_HDR_SIZE; |
| plen += sizeof(pid) + TAG_HDR_SIZE; |
| } |
| |
| packet.length = htons(plen); |
| |
| sendPacket(conn, conn->discoverySocket, &packet, (int) (plen + HDR_SIZE)); |
| if (conn->debugFile) { |
| dumpPacket(conn->debugFile, &packet, "SENT"); |
| fprintf(conn->debugFile, "\n"); |
| fflush(conn->debugFile); |
| } |
| } |
| |
| /********************************************************************** |
| *%FUNCTION: waitForPADO |
| *%ARGUMENTS: |
| * conn -- PPPoEConnection structure |
| * timeout -- how long to wait (in seconds) |
| *%RETURNS: |
| * Nothing |
| *%DESCRIPTION: |
| * Waits for a PADO packet and copies useful information |
| ***********************************************************************/ |
| void |
| waitForPADO(PPPoEConnection *conn, int timeout) |
| { |
| fd_set readable; |
| int r; |
| struct timeval tv; |
| PPPoEPacket packet; |
| int len; |
| |
| struct PacketCriteria pc; |
| pc.conn = conn; |
| pc.acNameOK = (conn->acName) ? 0 : 1; |
| pc.serviceNameOK = (conn->serviceName) ? 0 : 1; |
| pc.seenACName = 0; |
| pc.seenServiceName = 0; |
| conn->error = 0; |
| |
| do { |
| if (BPF_BUFFER_IS_EMPTY) { |
| tv.tv_sec = timeout; |
| tv.tv_usec = 0; |
| |
| FD_ZERO(&readable); |
| FD_SET(conn->discoverySocket, &readable); |
| |
| while(1) { |
| r = select(conn->discoverySocket+1, &readable, NULL, NULL, &tv); |
| if (r >= 0 || errno != EINTR) break; |
| } |
| if (r < 0) { |
| perror("select (waitForPADO)"); |
| return; |
| } |
| if (r == 0) return; /* Timed out */ |
| } |
| |
| /* Get the packet */ |
| receivePacket(conn->discoverySocket, &packet, &len); |
| |
| /* Check length */ |
| if (ntohs(packet.length) + HDR_SIZE > len) { |
| fprintf(stderr, "Bogus PPPoE length field (%u)\n", |
| (unsigned int) ntohs(packet.length)); |
| continue; |
| } |
| |
| #ifdef USE_BPF |
| /* If it's not a Discovery packet, loop again */ |
| if (etherType(&packet) != Eth_PPPOE_Discovery) continue; |
| #endif |
| |
| if (conn->debugFile) { |
| dumpPacket(conn->debugFile, &packet, "RCVD"); |
| fprintf(conn->debugFile, "\n"); |
| fflush(conn->debugFile); |
| } |
| /* If it's not for us, loop again */ |
| if (!packetIsForMe(conn, &packet)) continue; |
| |
| if (packet.code == CODE_PADO) { |
| if (BROADCAST(packet.ethHdr.h_source)) { |
| fprintf(stderr, "Ignoring PADO packet from broadcast MAC address\n"); |
| continue; |
| } |
| parsePacket(&packet, parsePADOTags, &pc); |
| if (conn->error) |
| return; |
| if (!pc.seenACName) { |
| fprintf(stderr, "Ignoring PADO packet with no AC-Name tag\n"); |
| continue; |
| } |
| if (!pc.seenServiceName) { |
| fprintf(stderr, "Ignoring PADO packet with no Service-Name tag\n"); |
| continue; |
| } |
| conn->numPADOs++; |
| printf("--------------------------------------------------\n"); |
| if (pc.acNameOK && pc.serviceNameOK) { |
| memcpy(conn->peerEth, packet.ethHdr.h_source, ETH_ALEN); |
| if (conn->printACNames) { |
| printf("AC-Ethernet-Address: %02x:%02x:%02x:%02x:%02x:%02x\n", |
| (unsigned) conn->peerEth[0], |
| (unsigned) conn->peerEth[1], |
| (unsigned) conn->peerEth[2], |
| (unsigned) conn->peerEth[3], |
| (unsigned) conn->peerEth[4], |
| (unsigned) conn->peerEth[5]); |
| continue; |
| } |
| conn->discoveryState = STATE_RECEIVED_PADO; |
| break; |
| } |
| } |
| } while (conn->discoveryState != STATE_RECEIVED_PADO); |
| } |
| |
| /********************************************************************** |
| *%FUNCTION: discovery |
| *%ARGUMENTS: |
| * conn -- PPPoE connection info structure |
| *%RETURNS: |
| * Nothing |
| *%DESCRIPTION: |
| * Performs the PPPoE discovery phase |
| ***********************************************************************/ |
| void |
| discovery(PPPoEConnection *conn) |
| { |
| int padiAttempts = 0; |
| int timeout = PADI_TIMEOUT; |
| |
| conn->discoverySocket = |
| openInterface(conn->ifName, Eth_PPPOE_Discovery, conn->myEth); |
| |
| do { |
| padiAttempts++; |
| if (padiAttempts > MAX_PADI_ATTEMPTS) { |
| fprintf(stderr, "Timeout waiting for PADO packets\n"); |
| close(conn->discoverySocket); |
| conn->discoverySocket = -1; |
| return; |
| } |
| sendPADI(conn); |
| conn->discoveryState = STATE_SENT_PADI; |
| waitForPADO(conn, timeout); |
| } while (!conn->numPADOs); |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| int opt; |
| PPPoEConnection *conn; |
| |
| conn = malloc(sizeof(PPPoEConnection)); |
| if (!conn) |
| fatalSys("malloc"); |
| |
| memset(conn, 0, sizeof(PPPoEConnection)); |
| |
| while ((opt = getopt(argc, argv, "I:D:VUAS:C:h")) > 0) { |
| switch(opt) { |
| case 'S': |
| conn->serviceName = xstrdup(optarg); |
| break; |
| case 'C': |
| conn->acName = xstrdup(optarg); |
| break; |
| case 'U': |
| conn->useHostUniq = 1; |
| break; |
| case 'D': |
| conn->debugFile = fopen(optarg, "w"); |
| if (!conn->debugFile) { |
| fprintf(stderr, "Could not open %s: %s\n", |
| optarg, strerror(errno)); |
| exit(1); |
| } |
| fprintf(conn->debugFile, "pppoe-discovery %s\n", RP_VERSION); |
| break; |
| case 'I': |
| conn->ifName = xstrdup(optarg); |
| break; |
| case 'A': |
| /* this is the default */ |
| break; |
| case 'V': |
| case 'h': |
| usage(); |
| exit(0); |
| default: |
| usage(); |
| exit(1); |
| } |
| } |
| |
| /* default interface name */ |
| if (!conn->ifName) |
| conn->ifName = strdup("eth0"); |
| |
| conn->discoverySocket = -1; |
| conn->sessionSocket = -1; |
| conn->printACNames = 1; |
| |
| discovery(conn); |
| exit(0); |
| } |
| |
| void rp_fatal(char const *str) |
| { |
| fprintf(stderr, "%s\n", str); |
| exit(1); |
| } |
| |
| void fatalSys(char const *str) |
| { |
| perror(str); |
| exit(1); |
| } |
| |
| void sysErr(char const *str) |
| { |
| rp_fatal(str); |
| } |
| |
| char *xstrdup(const char *s) |
| { |
| register char *ret = strdup(s); |
| if (!ret) |
| sysErr("strdup"); |
| return ret; |
| } |
| |
| void usage(void) |
| { |
| fprintf(stderr, "Usage: pppoe-discovery [options]\n"); |
| fprintf(stderr, "\nVersion " RP_VERSION "\n"); |
| } |