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/* $OpenBSD: canohost.c,v 1.73 2016/03/07 19:02:43 djm Exp $ */ |
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/* |
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* Author: Tatu Ylonen <ylo@cs.hut.fi> |
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
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* All rights reserved |
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* Functions for returning the canonical host name of the remote site. |
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* |
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* As far as I am concerned, the code I have written for this software |
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* can be used freely for any purpose. Any derived versions of this |
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* software must be clearly marked as such, and if the derived work is |
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* incompatible with the protocol description in the RFC file, it must be |
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* called by a name other than "ssh" or "Secure Shell". |
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*/ |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/un.h> |
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#include <netinet/in.h> |
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#include <errno.h> |
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#include <netdb.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <stdarg.h> |
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#include <unistd.h> |
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#include "xmalloc.h" |
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#include "packet.h" |
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#include "log.h" |
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#include "canohost.h" |
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#include "misc.h" |
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/* |
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* Returns the local/remote IP-address/hostname of socket as a string. |
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* The returned string must be freed. |
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*/ |
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static char * |
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get_socket_address(int sock, int remote, int flags) |
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{ |
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struct sockaddr_storage addr; |
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socklen_t addrlen; |
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char ntop[NI_MAXHOST]; |
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int r; |
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/* Get IP address of client. */ |
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addrlen = sizeof(addr); |
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memset(&addr, 0, sizeof(addr)); |
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if (remote) { |
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if (getpeername(sock, (struct sockaddr *)&addr, &addrlen) != 0) |
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return NULL; |
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} else { |
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if (getsockname(sock, (struct sockaddr *)&addr, &addrlen) != 0) |
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return NULL; |
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} |
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switch (addr.ss_family) { |
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case AF_INET: |
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case AF_INET6: |
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/* Get the address in ascii. */ |
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if ((r = getnameinfo((struct sockaddr *)&addr, addrlen, ntop, |
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sizeof(ntop), NULL, 0, flags)) != 0) { |
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error("%s: getnameinfo %d failed: %s", __func__, |
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flags, ssh_gai_strerror(r)); |
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return NULL; |
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} |
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return xstrdup(ntop); |
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case AF_UNIX: |
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/* Get the Unix domain socket path. */ |
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return xstrdup(((struct sockaddr_un *)&addr)->sun_path); |
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default: |
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/* We can't look up remote Unix domain sockets. */ |
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return NULL; |
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} |
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} |
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char * |
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get_peer_ipaddr(int sock) |
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{ |
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char *p; |
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if ((p = get_socket_address(sock, 1, NI_NUMERICHOST)) != NULL) |
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return p; |
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return xstrdup("UNKNOWN"); |
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} |
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char * |
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get_local_ipaddr(int sock) |
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{ |
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char *p; |
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if ((p = get_socket_address(sock, 0, NI_NUMERICHOST)) != NULL) |
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return p; |
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return xstrdup("UNKNOWN"); |
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} |
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char * |
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get_local_name(int fd) |
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{ |
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char *host, myname[NI_MAXHOST]; |
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/* Assume we were passed a socket */ |
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if ((host = get_socket_address(fd, 0, NI_NAMEREQD)) != NULL) |
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return host; |
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/* Handle the case where we were passed a pipe */ |
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if (gethostname(myname, sizeof(myname)) == -1) { |
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verbose("%s: gethostname: %s", __func__, strerror(errno)); |
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host = xstrdup("UNKNOWN"); |
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} else { |
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host = xstrdup(myname); |
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} |
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return host; |
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} |
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/* Returns the local/remote port for the socket. */ |
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static int |
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get_sock_port(int sock, int local) |
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{ |
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struct sockaddr_storage from; |
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socklen_t fromlen; |
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char strport[NI_MAXSERV]; |
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int r; |
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/* Get IP address of client. */ |
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fromlen = sizeof(from); |
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memset(&from, 0, sizeof(from)); |
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if (local) { |
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if (getsockname(sock, (struct sockaddr *)&from, &fromlen) < 0) { |
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error("getsockname failed: %.100s", strerror(errno)); |
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return 0; |
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} |
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} else { |
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if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) { |
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debug("getpeername failed: %.100s", strerror(errno)); |
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return -1; |
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} |
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} |
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/* Non-inet sockets don't have a port number. */ |
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if (from.ss_family != AF_INET && from.ss_family != AF_INET6) |
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return 0; |
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/* Return port number. */ |
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if ((r = getnameinfo((struct sockaddr *)&from, fromlen, NULL, 0, |
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strport, sizeof(strport), NI_NUMERICSERV)) != 0) |
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fatal("%s: getnameinfo NI_NUMERICSERV failed: %s", __func__, |
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ssh_gai_strerror(r)); |
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return atoi(strport); |
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} |
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int |
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get_peer_port(int sock) |
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{ |
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return get_sock_port(sock, 0); |
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} |
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int |
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get_local_port(int sock) |
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{ |
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return get_sock_port(sock, 1); |
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} |