1*36e94dc5SPeter Avalos /* $OpenBSD: canohost.c,v 1.71 2014/07/15 15:54:14 millert Exp $ */ 218de8d7fSPeter Avalos /* 318de8d7fSPeter Avalos * Author: Tatu Ylonen <ylo@cs.hut.fi> 418de8d7fSPeter Avalos * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 518de8d7fSPeter Avalos * All rights reserved 618de8d7fSPeter Avalos * Functions for returning the canonical host name of the remote site. 718de8d7fSPeter Avalos * 818de8d7fSPeter Avalos * As far as I am concerned, the code I have written for this software 918de8d7fSPeter Avalos * can be used freely for any purpose. Any derived versions of this 1018de8d7fSPeter Avalos * software must be clearly marked as such, and if the derived work is 1118de8d7fSPeter Avalos * incompatible with the protocol description in the RFC file, it must be 1218de8d7fSPeter Avalos * called by a name other than "ssh" or "Secure Shell". 1318de8d7fSPeter Avalos */ 1418de8d7fSPeter Avalos 1518de8d7fSPeter Avalos #include "includes.h" 1618de8d7fSPeter Avalos 1718de8d7fSPeter Avalos #include <sys/types.h> 1818de8d7fSPeter Avalos #include <sys/socket.h> 19*36e94dc5SPeter Avalos #include <sys/un.h> 2018de8d7fSPeter Avalos 2118de8d7fSPeter Avalos #include <netinet/in.h> 2218de8d7fSPeter Avalos #include <arpa/inet.h> 2318de8d7fSPeter Avalos 2418de8d7fSPeter Avalos #include <errno.h> 2518de8d7fSPeter Avalos #include <netdb.h> 2618de8d7fSPeter Avalos #include <stdio.h> 2718de8d7fSPeter Avalos #include <stdlib.h> 2818de8d7fSPeter Avalos #include <string.h> 2918de8d7fSPeter Avalos #include <stdarg.h> 30856ea928SPeter Avalos #include <unistd.h> 3118de8d7fSPeter Avalos 3218de8d7fSPeter Avalos #include "xmalloc.h" 3318de8d7fSPeter Avalos #include "packet.h" 3418de8d7fSPeter Avalos #include "log.h" 3518de8d7fSPeter Avalos #include "canohost.h" 3618de8d7fSPeter Avalos #include "misc.h" 3718de8d7fSPeter Avalos 3818de8d7fSPeter Avalos static void check_ip_options(int, char *); 3940c002afSPeter Avalos static char *canonical_host_ip = NULL; 4040c002afSPeter Avalos static int cached_port = -1; 4118de8d7fSPeter Avalos 4218de8d7fSPeter Avalos /* 4318de8d7fSPeter Avalos * Return the canonical name of the host at the other end of the socket. The 44*36e94dc5SPeter Avalos * caller should free the returned string. 4518de8d7fSPeter Avalos */ 4618de8d7fSPeter Avalos 4718de8d7fSPeter Avalos static char * 4818de8d7fSPeter Avalos get_remote_hostname(int sock, int use_dns) 4918de8d7fSPeter Avalos { 5018de8d7fSPeter Avalos struct sockaddr_storage from; 5118de8d7fSPeter Avalos socklen_t fromlen; 5218de8d7fSPeter Avalos struct addrinfo hints, *ai, *aitop; 5318de8d7fSPeter Avalos char name[NI_MAXHOST], ntop[NI_MAXHOST], ntop2[NI_MAXHOST]; 5418de8d7fSPeter Avalos 5518de8d7fSPeter Avalos /* Get IP address of client. */ 5618de8d7fSPeter Avalos fromlen = sizeof(from); 5718de8d7fSPeter Avalos memset(&from, 0, sizeof(from)); 5818de8d7fSPeter Avalos if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) { 5918de8d7fSPeter Avalos debug("getpeername failed: %.100s", strerror(errno)); 6018de8d7fSPeter Avalos cleanup_exit(255); 6118de8d7fSPeter Avalos } 6218de8d7fSPeter Avalos 6318de8d7fSPeter Avalos if (from.ss_family == AF_INET) 6418de8d7fSPeter Avalos check_ip_options(sock, ntop); 6518de8d7fSPeter Avalos 6618de8d7fSPeter Avalos ipv64_normalise_mapped(&from, &fromlen); 6718de8d7fSPeter Avalos 6818de8d7fSPeter Avalos if (from.ss_family == AF_INET6) 6918de8d7fSPeter Avalos fromlen = sizeof(struct sockaddr_in6); 7018de8d7fSPeter Avalos 7118de8d7fSPeter Avalos if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop), 7218de8d7fSPeter Avalos NULL, 0, NI_NUMERICHOST) != 0) 7318de8d7fSPeter Avalos fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed"); 7418de8d7fSPeter Avalos 7518de8d7fSPeter Avalos if (!use_dns) 7618de8d7fSPeter Avalos return xstrdup(ntop); 7718de8d7fSPeter Avalos 7818de8d7fSPeter Avalos debug3("Trying to reverse map address %.100s.", ntop); 7918de8d7fSPeter Avalos /* Map the IP address to a host name. */ 8018de8d7fSPeter Avalos if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name), 8118de8d7fSPeter Avalos NULL, 0, NI_NAMEREQD) != 0) { 8218de8d7fSPeter Avalos /* Host name not found. Use ip address. */ 8318de8d7fSPeter Avalos return xstrdup(ntop); 8418de8d7fSPeter Avalos } 8518de8d7fSPeter Avalos 8618de8d7fSPeter Avalos /* 8718de8d7fSPeter Avalos * if reverse lookup result looks like a numeric hostname, 8818de8d7fSPeter Avalos * someone is trying to trick us by PTR record like following: 8918de8d7fSPeter Avalos * 1.1.1.10.in-addr.arpa. IN PTR 2.3.4.5 9018de8d7fSPeter Avalos */ 9118de8d7fSPeter Avalos memset(&hints, 0, sizeof(hints)); 9218de8d7fSPeter Avalos hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 9318de8d7fSPeter Avalos hints.ai_flags = AI_NUMERICHOST; 9418de8d7fSPeter Avalos if (getaddrinfo(name, NULL, &hints, &ai) == 0) { 9518de8d7fSPeter Avalos logit("Nasty PTR record \"%s\" is set up for %s, ignoring", 9618de8d7fSPeter Avalos name, ntop); 9718de8d7fSPeter Avalos freeaddrinfo(ai); 9818de8d7fSPeter Avalos return xstrdup(ntop); 9918de8d7fSPeter Avalos } 10018de8d7fSPeter Avalos 101*36e94dc5SPeter Avalos /* Names are stores in lowercase. */ 102*36e94dc5SPeter Avalos lowercase(name); 103*36e94dc5SPeter Avalos 10418de8d7fSPeter Avalos /* 10518de8d7fSPeter Avalos * Map it back to an IP address and check that the given 10618de8d7fSPeter Avalos * address actually is an address of this host. This is 10718de8d7fSPeter Avalos * necessary because anyone with access to a name server can 10818de8d7fSPeter Avalos * define arbitrary names for an IP address. Mapping from 10918de8d7fSPeter Avalos * name to IP address can be trusted better (but can still be 11018de8d7fSPeter Avalos * fooled if the intruder has access to the name server of 11118de8d7fSPeter Avalos * the domain). 11218de8d7fSPeter Avalos */ 11318de8d7fSPeter Avalos memset(&hints, 0, sizeof(hints)); 11418de8d7fSPeter Avalos hints.ai_family = from.ss_family; 11518de8d7fSPeter Avalos hints.ai_socktype = SOCK_STREAM; 11618de8d7fSPeter Avalos if (getaddrinfo(name, NULL, &hints, &aitop) != 0) { 11718de8d7fSPeter Avalos logit("reverse mapping checking getaddrinfo for %.700s " 11818de8d7fSPeter Avalos "[%s] failed - POSSIBLE BREAK-IN ATTEMPT!", name, ntop); 11918de8d7fSPeter Avalos return xstrdup(ntop); 12018de8d7fSPeter Avalos } 12118de8d7fSPeter Avalos /* Look for the address from the list of addresses. */ 12218de8d7fSPeter Avalos for (ai = aitop; ai; ai = ai->ai_next) { 12318de8d7fSPeter Avalos if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2, 12418de8d7fSPeter Avalos sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 && 12518de8d7fSPeter Avalos (strcmp(ntop, ntop2) == 0)) 12618de8d7fSPeter Avalos break; 12718de8d7fSPeter Avalos } 12818de8d7fSPeter Avalos freeaddrinfo(aitop); 12918de8d7fSPeter Avalos /* If we reached the end of the list, the address was not there. */ 13018de8d7fSPeter Avalos if (!ai) { 13118de8d7fSPeter Avalos /* Address not found for the host name. */ 13218de8d7fSPeter Avalos logit("Address %.100s maps to %.600s, but this does not " 13318de8d7fSPeter Avalos "map back to the address - POSSIBLE BREAK-IN ATTEMPT!", 13418de8d7fSPeter Avalos ntop, name); 13518de8d7fSPeter Avalos return xstrdup(ntop); 13618de8d7fSPeter Avalos } 13718de8d7fSPeter Avalos return xstrdup(name); 13818de8d7fSPeter Avalos } 13918de8d7fSPeter Avalos 14018de8d7fSPeter Avalos /* 14118de8d7fSPeter Avalos * If IP options are supported, make sure there are none (log and 14218de8d7fSPeter Avalos * disconnect them if any are found). Basically we are worried about 14318de8d7fSPeter Avalos * source routing; it can be used to pretend you are somebody 14418de8d7fSPeter Avalos * (ip-address) you are not. That itself may be "almost acceptable" 14518de8d7fSPeter Avalos * under certain circumstances, but rhosts autentication is useless 14618de8d7fSPeter Avalos * if source routing is accepted. Notice also that if we just dropped 14718de8d7fSPeter Avalos * source routing here, the other side could use IP spoofing to do 14818de8d7fSPeter Avalos * rest of the interaction and could still bypass security. So we 14918de8d7fSPeter Avalos * exit here if we detect any IP options. 15018de8d7fSPeter Avalos */ 15118de8d7fSPeter Avalos /* IPv4 only */ 15218de8d7fSPeter Avalos static void 15318de8d7fSPeter Avalos check_ip_options(int sock, char *ipaddr) 15418de8d7fSPeter Avalos { 15518de8d7fSPeter Avalos #ifdef IP_OPTIONS 15618de8d7fSPeter Avalos u_char options[200]; 15718de8d7fSPeter Avalos char text[sizeof(options) * 3 + 1]; 158*36e94dc5SPeter Avalos socklen_t option_size, i; 15918de8d7fSPeter Avalos int ipproto; 16018de8d7fSPeter Avalos struct protoent *ip; 16118de8d7fSPeter Avalos 16218de8d7fSPeter Avalos if ((ip = getprotobyname("ip")) != NULL) 16318de8d7fSPeter Avalos ipproto = ip->p_proto; 16418de8d7fSPeter Avalos else 16518de8d7fSPeter Avalos ipproto = IPPROTO_IP; 16618de8d7fSPeter Avalos option_size = sizeof(options); 16718de8d7fSPeter Avalos if (getsockopt(sock, ipproto, IP_OPTIONS, options, 16818de8d7fSPeter Avalos &option_size) >= 0 && option_size != 0) { 16918de8d7fSPeter Avalos text[0] = '\0'; 17018de8d7fSPeter Avalos for (i = 0; i < option_size; i++) 17118de8d7fSPeter Avalos snprintf(text + i*3, sizeof(text) - i*3, 17218de8d7fSPeter Avalos " %2.2x", options[i]); 17318de8d7fSPeter Avalos fatal("Connection from %.100s with IP options:%.800s", 17418de8d7fSPeter Avalos ipaddr, text); 17518de8d7fSPeter Avalos } 17618de8d7fSPeter Avalos #endif /* IP_OPTIONS */ 17718de8d7fSPeter Avalos } 17818de8d7fSPeter Avalos 17918de8d7fSPeter Avalos void 18018de8d7fSPeter Avalos ipv64_normalise_mapped(struct sockaddr_storage *addr, socklen_t *len) 18118de8d7fSPeter Avalos { 18218de8d7fSPeter Avalos struct sockaddr_in6 *a6 = (struct sockaddr_in6 *)addr; 18318de8d7fSPeter Avalos struct sockaddr_in *a4 = (struct sockaddr_in *)addr; 18418de8d7fSPeter Avalos struct in_addr inaddr; 18518de8d7fSPeter Avalos u_int16_t port; 18618de8d7fSPeter Avalos 18718de8d7fSPeter Avalos if (addr->ss_family != AF_INET6 || 18818de8d7fSPeter Avalos !IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr)) 18918de8d7fSPeter Avalos return; 19018de8d7fSPeter Avalos 19118de8d7fSPeter Avalos debug3("Normalising mapped IPv4 in IPv6 address"); 19218de8d7fSPeter Avalos 19318de8d7fSPeter Avalos memcpy(&inaddr, ((char *)&a6->sin6_addr) + 12, sizeof(inaddr)); 19418de8d7fSPeter Avalos port = a6->sin6_port; 19518de8d7fSPeter Avalos 196*36e94dc5SPeter Avalos memset(a4, 0, sizeof(*a4)); 19718de8d7fSPeter Avalos 19818de8d7fSPeter Avalos a4->sin_family = AF_INET; 19918de8d7fSPeter Avalos *len = sizeof(*a4); 20018de8d7fSPeter Avalos memcpy(&a4->sin_addr, &inaddr, sizeof(inaddr)); 20118de8d7fSPeter Avalos a4->sin_port = port; 20218de8d7fSPeter Avalos } 20318de8d7fSPeter Avalos 20418de8d7fSPeter Avalos /* 20518de8d7fSPeter Avalos * Return the canonical name of the host in the other side of the current 20618de8d7fSPeter Avalos * connection. The host name is cached, so it is efficient to call this 20718de8d7fSPeter Avalos * several times. 20818de8d7fSPeter Avalos */ 20918de8d7fSPeter Avalos 21018de8d7fSPeter Avalos const char * 21118de8d7fSPeter Avalos get_canonical_hostname(int use_dns) 21218de8d7fSPeter Avalos { 21318de8d7fSPeter Avalos char *host; 21418de8d7fSPeter Avalos static char *canonical_host_name = NULL; 21518de8d7fSPeter Avalos static char *remote_ip = NULL; 21618de8d7fSPeter Avalos 21718de8d7fSPeter Avalos /* Check if we have previously retrieved name with same option. */ 21818de8d7fSPeter Avalos if (use_dns && canonical_host_name != NULL) 21918de8d7fSPeter Avalos return canonical_host_name; 22018de8d7fSPeter Avalos if (!use_dns && remote_ip != NULL) 22118de8d7fSPeter Avalos return remote_ip; 22218de8d7fSPeter Avalos 22318de8d7fSPeter Avalos /* Get the real hostname if socket; otherwise return UNKNOWN. */ 22418de8d7fSPeter Avalos if (packet_connection_is_on_socket()) 22518de8d7fSPeter Avalos host = get_remote_hostname(packet_get_connection_in(), use_dns); 22618de8d7fSPeter Avalos else 22718de8d7fSPeter Avalos host = "UNKNOWN"; 22818de8d7fSPeter Avalos 22918de8d7fSPeter Avalos if (use_dns) 23018de8d7fSPeter Avalos canonical_host_name = host; 23118de8d7fSPeter Avalos else 23218de8d7fSPeter Avalos remote_ip = host; 23318de8d7fSPeter Avalos return host; 23418de8d7fSPeter Avalos } 23518de8d7fSPeter Avalos 23618de8d7fSPeter Avalos /* 23718de8d7fSPeter Avalos * Returns the local/remote IP-address/hostname of socket as a string. 23818de8d7fSPeter Avalos * The returned string must be freed. 23918de8d7fSPeter Avalos */ 24018de8d7fSPeter Avalos static char * 24118de8d7fSPeter Avalos get_socket_address(int sock, int remote, int flags) 24218de8d7fSPeter Avalos { 24318de8d7fSPeter Avalos struct sockaddr_storage addr; 24418de8d7fSPeter Avalos socklen_t addrlen; 24518de8d7fSPeter Avalos char ntop[NI_MAXHOST]; 24618de8d7fSPeter Avalos int r; 24718de8d7fSPeter Avalos 24818de8d7fSPeter Avalos /* Get IP address of client. */ 24918de8d7fSPeter Avalos addrlen = sizeof(addr); 25018de8d7fSPeter Avalos memset(&addr, 0, sizeof(addr)); 25118de8d7fSPeter Avalos 25218de8d7fSPeter Avalos if (remote) { 25318de8d7fSPeter Avalos if (getpeername(sock, (struct sockaddr *)&addr, &addrlen) 25418de8d7fSPeter Avalos < 0) 25518de8d7fSPeter Avalos return NULL; 25618de8d7fSPeter Avalos } else { 25718de8d7fSPeter Avalos if (getsockname(sock, (struct sockaddr *)&addr, &addrlen) 25818de8d7fSPeter Avalos < 0) 25918de8d7fSPeter Avalos return NULL; 26018de8d7fSPeter Avalos } 26118de8d7fSPeter Avalos 26218de8d7fSPeter Avalos /* Work around Linux IPv6 weirdness */ 26318de8d7fSPeter Avalos if (addr.ss_family == AF_INET6) 26418de8d7fSPeter Avalos addrlen = sizeof(struct sockaddr_in6); 26518de8d7fSPeter Avalos 266*36e94dc5SPeter Avalos if (addr.ss_family == AF_UNIX) { 267*36e94dc5SPeter Avalos /* Get the Unix domain socket path. */ 268*36e94dc5SPeter Avalos return xstrdup(((struct sockaddr_un *)&addr)->sun_path); 269*36e94dc5SPeter Avalos } 270*36e94dc5SPeter Avalos 27118de8d7fSPeter Avalos ipv64_normalise_mapped(&addr, &addrlen); 27218de8d7fSPeter Avalos 27318de8d7fSPeter Avalos /* Get the address in ascii. */ 27418de8d7fSPeter Avalos if ((r = getnameinfo((struct sockaddr *)&addr, addrlen, ntop, 27518de8d7fSPeter Avalos sizeof(ntop), NULL, 0, flags)) != 0) { 27618de8d7fSPeter Avalos error("get_socket_address: getnameinfo %d failed: %s", flags, 27718de8d7fSPeter Avalos ssh_gai_strerror(r)); 27818de8d7fSPeter Avalos return NULL; 27918de8d7fSPeter Avalos } 28018de8d7fSPeter Avalos return xstrdup(ntop); 28118de8d7fSPeter Avalos } 28218de8d7fSPeter Avalos 28318de8d7fSPeter Avalos char * 28418de8d7fSPeter Avalos get_peer_ipaddr(int sock) 28518de8d7fSPeter Avalos { 28618de8d7fSPeter Avalos char *p; 28718de8d7fSPeter Avalos 28818de8d7fSPeter Avalos if ((p = get_socket_address(sock, 1, NI_NUMERICHOST)) != NULL) 28918de8d7fSPeter Avalos return p; 29018de8d7fSPeter Avalos return xstrdup("UNKNOWN"); 29118de8d7fSPeter Avalos } 29218de8d7fSPeter Avalos 29318de8d7fSPeter Avalos char * 29418de8d7fSPeter Avalos get_local_ipaddr(int sock) 29518de8d7fSPeter Avalos { 29618de8d7fSPeter Avalos char *p; 29718de8d7fSPeter Avalos 29818de8d7fSPeter Avalos if ((p = get_socket_address(sock, 0, NI_NUMERICHOST)) != NULL) 29918de8d7fSPeter Avalos return p; 30018de8d7fSPeter Avalos return xstrdup("UNKNOWN"); 30118de8d7fSPeter Avalos } 30218de8d7fSPeter Avalos 30318de8d7fSPeter Avalos char * 304856ea928SPeter Avalos get_local_name(int fd) 30518de8d7fSPeter Avalos { 306856ea928SPeter Avalos char *host, myname[NI_MAXHOST]; 307856ea928SPeter Avalos 308856ea928SPeter Avalos /* Assume we were passed a socket */ 309856ea928SPeter Avalos if ((host = get_socket_address(fd, 0, NI_NAMEREQD)) != NULL) 310856ea928SPeter Avalos return host; 311856ea928SPeter Avalos 312856ea928SPeter Avalos /* Handle the case where we were passed a pipe */ 313856ea928SPeter Avalos if (gethostname(myname, sizeof(myname)) == -1) { 314856ea928SPeter Avalos verbose("get_local_name: gethostname: %s", strerror(errno)); 315856ea928SPeter Avalos } else { 316856ea928SPeter Avalos host = xstrdup(myname); 317856ea928SPeter Avalos } 318856ea928SPeter Avalos 319856ea928SPeter Avalos return host; 32018de8d7fSPeter Avalos } 32118de8d7fSPeter Avalos 32240c002afSPeter Avalos void 32340c002afSPeter Avalos clear_cached_addr(void) 32440c002afSPeter Avalos { 325*36e94dc5SPeter Avalos free(canonical_host_ip); 32640c002afSPeter Avalos canonical_host_ip = NULL; 32740c002afSPeter Avalos cached_port = -1; 32840c002afSPeter Avalos } 32940c002afSPeter Avalos 33018de8d7fSPeter Avalos /* 33118de8d7fSPeter Avalos * Returns the IP-address of the remote host as a string. The returned 33218de8d7fSPeter Avalos * string must not be freed. 33318de8d7fSPeter Avalos */ 33418de8d7fSPeter Avalos 33518de8d7fSPeter Avalos const char * 33618de8d7fSPeter Avalos get_remote_ipaddr(void) 33718de8d7fSPeter Avalos { 33818de8d7fSPeter Avalos /* Check whether we have cached the ipaddr. */ 33918de8d7fSPeter Avalos if (canonical_host_ip == NULL) { 34018de8d7fSPeter Avalos if (packet_connection_is_on_socket()) { 34118de8d7fSPeter Avalos canonical_host_ip = 34218de8d7fSPeter Avalos get_peer_ipaddr(packet_get_connection_in()); 34318de8d7fSPeter Avalos if (canonical_host_ip == NULL) 34418de8d7fSPeter Avalos cleanup_exit(255); 34518de8d7fSPeter Avalos } else { 34618de8d7fSPeter Avalos /* If not on socket, return UNKNOWN. */ 34718de8d7fSPeter Avalos canonical_host_ip = xstrdup("UNKNOWN"); 34818de8d7fSPeter Avalos } 34918de8d7fSPeter Avalos } 35018de8d7fSPeter Avalos return canonical_host_ip; 35118de8d7fSPeter Avalos } 35218de8d7fSPeter Avalos 35318de8d7fSPeter Avalos const char * 35418de8d7fSPeter Avalos get_remote_name_or_ip(u_int utmp_len, int use_dns) 35518de8d7fSPeter Avalos { 35618de8d7fSPeter Avalos static const char *remote = ""; 35718de8d7fSPeter Avalos if (utmp_len > 0) 35818de8d7fSPeter Avalos remote = get_canonical_hostname(use_dns); 35918de8d7fSPeter Avalos if (utmp_len == 0 || strlen(remote) > utmp_len) 36018de8d7fSPeter Avalos remote = get_remote_ipaddr(); 36118de8d7fSPeter Avalos return remote; 36218de8d7fSPeter Avalos } 36318de8d7fSPeter Avalos 36418de8d7fSPeter Avalos /* Returns the local/remote port for the socket. */ 36518de8d7fSPeter Avalos 366cb5eb4f1SPeter Avalos int 36718de8d7fSPeter Avalos get_sock_port(int sock, int local) 36818de8d7fSPeter Avalos { 36918de8d7fSPeter Avalos struct sockaddr_storage from; 37018de8d7fSPeter Avalos socklen_t fromlen; 37118de8d7fSPeter Avalos char strport[NI_MAXSERV]; 37218de8d7fSPeter Avalos int r; 37318de8d7fSPeter Avalos 37418de8d7fSPeter Avalos /* Get IP address of client. */ 37518de8d7fSPeter Avalos fromlen = sizeof(from); 37618de8d7fSPeter Avalos memset(&from, 0, sizeof(from)); 37718de8d7fSPeter Avalos if (local) { 37818de8d7fSPeter Avalos if (getsockname(sock, (struct sockaddr *)&from, &fromlen) < 0) { 37918de8d7fSPeter Avalos error("getsockname failed: %.100s", strerror(errno)); 38018de8d7fSPeter Avalos return 0; 38118de8d7fSPeter Avalos } 38218de8d7fSPeter Avalos } else { 38318de8d7fSPeter Avalos if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) { 38418de8d7fSPeter Avalos debug("getpeername failed: %.100s", strerror(errno)); 38518de8d7fSPeter Avalos return -1; 38618de8d7fSPeter Avalos } 38718de8d7fSPeter Avalos } 38818de8d7fSPeter Avalos 38918de8d7fSPeter Avalos /* Work around Linux IPv6 weirdness */ 39018de8d7fSPeter Avalos if (from.ss_family == AF_INET6) 39118de8d7fSPeter Avalos fromlen = sizeof(struct sockaddr_in6); 39218de8d7fSPeter Avalos 393*36e94dc5SPeter Avalos /* Unix domain sockets don't have a port number. */ 394*36e94dc5SPeter Avalos if (from.ss_family == AF_UNIX) 395*36e94dc5SPeter Avalos return 0; 396*36e94dc5SPeter Avalos 39718de8d7fSPeter Avalos /* Return port number. */ 39818de8d7fSPeter Avalos if ((r = getnameinfo((struct sockaddr *)&from, fromlen, NULL, 0, 39918de8d7fSPeter Avalos strport, sizeof(strport), NI_NUMERICSERV)) != 0) 40018de8d7fSPeter Avalos fatal("get_sock_port: getnameinfo NI_NUMERICSERV failed: %s", 40118de8d7fSPeter Avalos ssh_gai_strerror(r)); 40218de8d7fSPeter Avalos return atoi(strport); 40318de8d7fSPeter Avalos } 40418de8d7fSPeter Avalos 40518de8d7fSPeter Avalos /* Returns remote/local port number for the current connection. */ 40618de8d7fSPeter Avalos 40718de8d7fSPeter Avalos static int 40818de8d7fSPeter Avalos get_port(int local) 40918de8d7fSPeter Avalos { 41018de8d7fSPeter Avalos /* 41118de8d7fSPeter Avalos * If the connection is not a socket, return 65535. This is 41218de8d7fSPeter Avalos * intentionally chosen to be an unprivileged port number. 41318de8d7fSPeter Avalos */ 41418de8d7fSPeter Avalos if (!packet_connection_is_on_socket()) 41518de8d7fSPeter Avalos return 65535; 41618de8d7fSPeter Avalos 41718de8d7fSPeter Avalos /* Get socket and return the port number. */ 41818de8d7fSPeter Avalos return get_sock_port(packet_get_connection_in(), local); 41918de8d7fSPeter Avalos } 42018de8d7fSPeter Avalos 42118de8d7fSPeter Avalos int 42218de8d7fSPeter Avalos get_peer_port(int sock) 42318de8d7fSPeter Avalos { 42418de8d7fSPeter Avalos return get_sock_port(sock, 0); 42518de8d7fSPeter Avalos } 42618de8d7fSPeter Avalos 42718de8d7fSPeter Avalos int 42818de8d7fSPeter Avalos get_remote_port(void) 42918de8d7fSPeter Avalos { 43018de8d7fSPeter Avalos /* Cache to avoid getpeername() on a dead connection */ 43140c002afSPeter Avalos if (cached_port == -1) 43240c002afSPeter Avalos cached_port = get_port(0); 43318de8d7fSPeter Avalos 43440c002afSPeter Avalos return cached_port; 43518de8d7fSPeter Avalos } 43618de8d7fSPeter Avalos 43718de8d7fSPeter Avalos int 43818de8d7fSPeter Avalos get_local_port(void) 43918de8d7fSPeter Avalos { 44018de8d7fSPeter Avalos return get_port(1); 44118de8d7fSPeter Avalos } 442