X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/df5cd107a57a592b196add0aac7642b89ac261b0..9411292489496984c8d5d9a446bf071afac3866d:/socket.c diff --git a/socket.c b/socket.c index 264c5321..0ad766d2 100644 --- a/socket.c +++ b/socket.c @@ -1,38 +1,43 @@ -/* -*- c-file-style: "linux" -*- - - rsync -- fast file replication program - - Copyright (C) 1992-2001 by Andrew Tridgell - Copyright (C) 2001, 2002 by Martin Pool - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ - -/** - * @file socket.c - * +/* * Socket functions used in rsync. * - * This file is now converted to use the new-style getaddrinfo() + * Copyright (C) 1992-2001 Andrew Tridgell + * Copyright (C) 2001, 2002 Martin Pool + * Copyright (C) 2003-2008 Wayne Davison + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, visit the http://fsf.org website. + */ + +/* This file is now converted to use the new-style getaddrinfo() * interface, which supports IPv6 but is also supported on recent * IPv4-only machines. On systems that don't have that interface, we - * emulate it using the KAME implementation. - **/ + * emulate it using the KAME implementation. */ #include "rsync.h" - +#include "itypes.h" +#include +#include +#include + +extern char *bind_address; +extern char *sockopts; +extern int default_af_hint; +extern int connect_timeout; + +#ifdef HAVE_SIGACTION +static struct sigaction sigact; +#endif /** * Establish a proxy connection on an open socket to a web proxy by @@ -52,13 +57,13 @@ static int establish_proxy_connection(int fd, char *host, int port, proxy_user, ":", proxy_pass, NULL); len = strlen(buffer); - if ((len*8 + 5) / 6 >= (int)sizeof authbuf) { + if ((len*8 + 5) / 6 >= (int)sizeof authbuf - 3) { rprintf(FERROR, "authentication information is too long\n"); return -1; } - base64_encode(buffer, len, authbuf); + base64_encode(buffer, len, authbuf, 1); authhdr = "\r\nProxy-Authorization: Basic "; } else { *authbuf = '\0'; @@ -69,15 +74,13 @@ static int establish_proxy_connection(int fd, char *host, int port, host, port, authhdr, authbuf); len = strlen(buffer); if (write(fd, buffer, len) != len) { - rprintf(FERROR, "failed to write to proxy: %s\n", - strerror(errno)); + rsyserr(FERROR, errno, "failed to write to proxy"); return -1; } for (cp = buffer; cp < &buffer[sizeof buffer - 1]; cp++) { if (read(fd, cp, 1) != 1) { - rprintf(FERROR, "failed to read from proxy: %s\n", - strerror(errno)); + rsyserr(FERROR, errno, "failed to read from proxy"); return -1; } if (*cp == '\n') @@ -90,15 +93,15 @@ static int establish_proxy_connection(int fd, char *host, int port, if (*cp == '\r') *cp = '\0'; if (strncmp(buffer, "HTTP/", 5) != 0) { - rprintf(FERROR, "bad response from proxy - %s\n", + rprintf(FERROR, "bad response from proxy -- %s\n", buffer); return -1; } - for (cp = &buffer[5]; isdigit(*(uchar*)cp) || *cp == '.'; cp++) {} + for (cp = &buffer[5]; isDigit(cp) || *cp == '.'; cp++) {} while (*cp == ' ') cp++; if (*cp != '2') { - rprintf(FERROR, "bad response from proxy - %s\n", + rprintf(FERROR, "bad response from proxy -- %s\n", buffer); return -1; } @@ -106,8 +109,8 @@ static int establish_proxy_connection(int fd, char *host, int port, while (1) { for (cp = buffer; cp < &buffer[sizeof buffer - 1]; cp++) { if (read(fd, cp, 1) != 1) { - rprintf(FERROR, "failed to read from proxy: %s\n", - strerror(errno)); + rsyserr(FERROR, errno, + "failed to read from proxy"); return -1; } if (*cp == '\n') @@ -127,7 +130,7 @@ static int establish_proxy_connection(int fd, char *host, int port, * if this fails. **/ int try_bind_local(int s, int ai_family, int ai_socktype, - const char *bind_address) + const char *bind_addr) { int error; struct addrinfo bhints, *bres_all, *r; @@ -136,9 +139,9 @@ int try_bind_local(int s, int ai_family, int ai_socktype, bhints.ai_family = ai_family; bhints.ai_socktype = ai_socktype; bhints.ai_flags = AI_PASSIVE; - if ((error = getaddrinfo(bind_address, NULL, &bhints, &bres_all))) { + if ((error = getaddrinfo(bind_addr, NULL, &bhints, &bres_all))) { rprintf(FERROR, RSYNC_NAME ": getaddrinfo %s: %s\n", - bind_address, gai_strerror(error)); + bind_addr, gai_strerror(error)); return -1; } @@ -156,6 +159,11 @@ int try_bind_local(int s, int ai_family, int ai_socktype, return -1; } +/* connect() timeout handler based on alarm() */ +static RETSIGTYPE contimeout_handler(UNUSED(int val)) +{ + connect_timeout = -1; +} /** * Open a socket to a tcp remote host with the specified port . @@ -172,12 +180,12 @@ int try_bind_local(int s, int ai_family, int ai_socktype, * reachable, perhaps because we can't e.g. route ipv6 to that network * but we can get ip4 packets through. * - * @param bind_address Local address to use. Normally NULL to bind + * @param bind_addr Local address to use. Normally NULL to bind * the wildcard address. * * @param af_hint Address family, e.g. AF_INET or AF_INET6. **/ -int open_socket_out(char *host, int port, const char *bind_address, +int open_socket_out(char *host, int port, const char *bind_addr, int af_hint) { int type = SOCK_STREAM; @@ -198,7 +206,7 @@ int open_socket_out(char *host, int port, const char *bind_address, strlcpy(buffer, h, sizeof buffer); /* Is the USER:PASS@ prefix present? */ - if ((cp = strchr(buffer, '@')) != NULL) { + if ((cp = strrchr(buffer, '@')) != NULL) { *cp++ = '\0'; /* The remainder is the HOST:PORT part. */ h = cp; @@ -224,7 +232,7 @@ int open_socket_out(char *host, int port, const char *bind_address, } *cp++ = '\0'; strlcpy(portbuf, cp, sizeof portbuf); - if (verbose >= 2) { + if (DEBUG_GTE(CONNECT, 1)) { rprintf(FINFO, "connection via http proxy %s port %s\n", h, portbuf); } @@ -253,18 +261,35 @@ int open_socket_out(char *host, int port, const char *bind_address, if (s < 0) continue; - if (bind_address + if (bind_addr && try_bind_local(s, res->ai_family, type, - bind_address) == -1) { + bind_addr) == -1) { close(s); s = -1; continue; } - if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { + if (connect_timeout > 0) { + SIGACTION(SIGALRM, contimeout_handler); + alarm(connect_timeout); + } + + set_socket_options(s, sockopts); + while (connect(s, res->ai_addr, res->ai_addrlen) < 0) { + if (connect_timeout < 0) + exit_cleanup(RERR_CONTIMEOUT); + if (errno == EINTR) + continue; close(s); s = -1; - continue; + break; } + + if (connect_timeout > 0) + alarm(0); + + if (s < 0) + continue; + if (proxied && establish_proxy_connection(s, host, port, proxy_user, proxy_pass) != 0) { @@ -276,8 +301,7 @@ int open_socket_out(char *host, int port, const char *bind_address, } freeaddrinfo(res0); if (s < 0) { - rprintf(FERROR, RSYNC_NAME ": failed to connect to %s: %s\n", - h, strerror(errno)); + rsyserr(FERROR, errno, "failed to connect to %s", h); return -1; } return s; @@ -294,50 +318,81 @@ int open_socket_out(char *host, int port, const char *bind_address, * * This is based on the Samba LIBSMB_PROG feature. * - * @param bind_address Local address to use. Normally NULL to get the stack default. + * @param bind_addr Local address to use. Normally NULL to get the stack default. **/ -int open_socket_out_wrapped(char *host, int port, const char *bind_address, +int open_socket_out_wrapped(char *host, int port, const char *bind_addr, int af_hint) { char *prog = getenv("RSYNC_CONNECT_PROG"); - if (verbose >= 2) { + if (prog && strchr(prog, '%')) { + int hlen = strlen(host); + int len = strlen(prog) + 1; + char *f, *t; + for (f = prog; *f; f++) { + if (*f != '%') + continue; + /* Compute more than enough room. */ + if (f[1] == '%') + f++; + else + len += hlen; + } + f = prog; + if (!(prog = new_array(char, len))) + out_of_memory("open_socket_out_wrapped"); + for (t = prog; *f; f++) { + if (*f == '%') { + switch (*++f) { + case '%': + /* Just skips the extra '%'. */ + break; + case 'H': + memcpy(t, host, hlen); + t += hlen; + continue; + default: + f--; /* pass % through */ + break; + } + } + *t++ = *f; + } + *t = '\0'; + } + + if (DEBUG_GTE(CONNECT, 1)) { rprintf(FINFO, "%sopening tcp connection to %s port %d\n", prog ? "Using RSYNC_CONNECT_PROG instead of " : "", host, port); } if (prog) return sock_exec(prog); - return open_socket_out(host, port, bind_address, af_hint); + return open_socket_out(host, port, bind_addr, af_hint); } /** - * Open a socket of the specified type, port and address for incoming data - * - * Try to be better about handling the results of getaddrinfo(): when - * opening an inbound socket, we might get several address results, - * e.g. for the machine's ipv4 and ipv6 name. + * Open one or more sockets for incoming data using the specified type, + * port, and address. * - * If binding a wildcard, then any one of them should do. If an address - * was specified but it's insufficiently specific then that's not our - * fault. + * The getaddrinfo() call may return several address results, e.g. for + * the machine's IPv4 and IPv6 name. * - * However, some of the advertized addresses may not work because e.g. we - * don't have IPv6 support in the kernel. In that case go on and try all - * addresses until one succeeds. + * We return an array of file-descriptors to the sockets, with a trailing + * -1 value to indicate the end of the list. * - * @param bind_address Local address to bind, or NULL to allow it to + * @param bind_addr Local address to bind, or NULL to allow it to * default. **/ -static int *open_socket_in(int type, int port, const char *bind_address, +static int *open_socket_in(int type, int port, const char *bind_addr, int af_hint) { - int one=1; - int s, *sp, *socks, maxs; + int one = 1; + int s, *socks, maxs, i, ecnt; struct addrinfo hints, *all_ai, *resp; - char portbuf[10]; + char portbuf[10], **errmsgs; int error; memset(&hints, 0, sizeof hints); @@ -345,63 +400,89 @@ static int *open_socket_in(int type, int port, const char *bind_address, hints.ai_socktype = type; hints.ai_flags = AI_PASSIVE; snprintf(portbuf, sizeof portbuf, "%d", port); - error = getaddrinfo(bind_address, portbuf, &hints, &all_ai); + error = getaddrinfo(bind_addr, portbuf, &hints, &all_ai); if (error) { rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", - bind_address, gai_strerror(error)); + bind_addr, gai_strerror(error)); return NULL; } /* Count max number of sockets we might open. */ for (maxs = 0, resp = all_ai; resp; resp = resp->ai_next, maxs++) {} + socks = new_array(int, maxs + 1); - if (!socks) { - rprintf(FERROR, - RSYNC_NAME "couldn't allocate memory for sockets"); - return NULL; - } + errmsgs = new_array(char *, maxs); + if (!socks || !errmsgs) + out_of_memory("open_socket_in"); /* We may not be able to create the socket, if for example the * machine knows about IPv6 in the C library, but not in the * kernel. */ - sp = socks + 1; /* Leave room for count at start of array. */ - for (resp = all_ai; resp; resp = resp->ai_next) { + for (resp = all_ai, i = ecnt = 0; resp; resp = resp->ai_next) { s = socket(resp->ai_family, resp->ai_socktype, resp->ai_protocol); if (s == -1) { + int r = asprintf(&errmsgs[ecnt++], + "socket(%d,%d,%d) failed: %s\n", + (int)resp->ai_family, (int)resp->ai_socktype, + (int)resp->ai_protocol, strerror(errno)); + if (r < 0) + out_of_memory("open_socket_in"); /* See if there's another address that will work... */ continue; } setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof one); + if (sockopts) + set_socket_options(s, sockopts); + else + set_socket_options(s, lp_socket_options()); #ifdef IPV6_V6ONLY if (resp->ai_family == AF_INET6) { - setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, - (char *)&one, sizeof one); + if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, + (char *)&one, sizeof one) < 0 + && default_af_hint != AF_INET6) { + close(s); + continue; + } } #endif /* Now we've got a socket - we need to bind it. */ if (bind(s, resp->ai_addr, resp->ai_addrlen) < 0) { /* Nope, try another */ + int r = asprintf(&errmsgs[ecnt++], + "bind() failed: %s (address-family %d)\n", + strerror(errno), (int)resp->ai_family); + if (r < 0) + out_of_memory("open_socket_in"); close(s); continue; } - *sp++ = s; + socks[i++] = s; } - *socks = sp - socks - 1; /* Save count. */ + socks[i] = -1; if (all_ai) freeaddrinfo(all_ai); - if (*socks == 0) { + /* Only output the socket()/bind() messages if we were totally + * unsuccessful, or if the daemon is being run with -vv. */ + for (s = 0; s < ecnt; s++) { + if (!i || DEBUG_GTE(BIND, 1)) + rwrite(FLOG, errmsgs[s], strlen(errmsgs[s]), 0); + free(errmsgs[s]); + } + free(errmsgs); + + if (!i) { rprintf(FERROR, - RSYNC_NAME ": open inbound socket on port %d failed: " - "%s\n", port, strerror(errno)); + "unable to bind any inbound sockets on port %d\n", + port); free(socks); return NULL; } @@ -439,16 +520,20 @@ static RETSIGTYPE sigchld_handler(UNUSED(int val)) #ifdef WNOHANG while (waitpid(-1, NULL, WNOHANG) > 0) {} #endif +#ifndef HAVE_SIGACTION signal(SIGCHLD, sigchld_handler); +#endif } void start_accept_loop(int port, int (*fn)(int, int)) { fd_set deffds; - int *sp, maxfd, i, j; - extern char *bind_address; - extern int default_af_hint; + int *sp, maxfd, i; + +#ifdef HAVE_SIGACTION + sigact.sa_flags = SA_NOCLDSTOP; +#endif /* open an incoming socket */ sp = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint); @@ -457,12 +542,15 @@ void start_accept_loop(int port, int (*fn)(int, int)) /* ready to listen */ FD_ZERO(&deffds); - maxfd = -1; - for (i = 1; i <= *sp; i++) { - if (listen(sp[i], 5) == -1) { - for (j = 1; j <= i; j++) - close(sp[j]); - free(sp); + for (i = 0, maxfd = -1; sp[i] >= 0; i++) { + if (listen(sp[i], 5) < 0) { + rsyserr(FERROR, errno, "listen() on socket failed"); +#ifdef INET6 + if (errno == EADDRINUSE && i > 0) { + rprintf(FINFO, + "Try using --ipv4 or --ipv6 to avoid this listen() error.\n"); + } +#endif exit_cleanup(RERR_SOCKETIO); } FD_SET(sp[i], &deffds); @@ -470,7 +558,6 @@ void start_accept_loop(int port, int (*fn)(int, int)) maxfd = sp[i]; } - /* now accept incoming connections - forking a new process * for each incoming connection */ while (1) { @@ -483,7 +570,7 @@ void start_accept_loop(int port, int (*fn)(int, int)) /* close log file before the potentially very long select so * file can be trimmed by another process instead of growing * forever */ - log_close(); + logfile_close(); #ifdef FD_COPY FD_COPY(&deffds, &fds); @@ -494,8 +581,7 @@ void start_accept_loop(int port, int (*fn)(int, int)) if (select(maxfd + 1, &fds, NULL, NULL, NULL) != 1) continue; - fd = -1; - for (i = 1; i <= *sp; i++) { + for (i = 0, fd = -1; sp[i] >= 0; i++) { if (FD_ISSET(sp[i], &fds)) { fd = accept(sp[i], (struct sockaddr *)&addr, &addrlen); @@ -506,22 +592,21 @@ void start_accept_loop(int port, int (*fn)(int, int)) if (fd < 0) continue; - signal(SIGCHLD, sigchld_handler); + SIGACTION(SIGCHLD, sigchld_handler); if ((pid = fork()) == 0) { int ret; - close(sp[i]); - /* open log file in child before possibly giving - * up privileges */ - log_open(); + for (i = 0; sp[i] >= 0; i++) + close(sp[i]); + /* Re-open log file in child before possibly giving + * up privileges (see logfile_close() above). */ + logfile_reopen(); ret = fn(fd, fd); close_all(); _exit(ret); } else if (pid < 0) { - rprintf(FERROR, - RSYNC_NAME - ": could not create child server process: %s\n", - strerror(errno)); + rsyserr(FERROR, errno, + "could not create child server process"); close(fd); /* This might have happened because we're * overloaded. Sleep briefly before trying to @@ -532,7 +617,6 @@ void start_accept_loop(int port, int (*fn)(int, int)) close(fd); } } - free(sp); } @@ -627,7 +711,7 @@ void set_socket_options(int fd, char *options) case OPT_ON: if (got_value) - rprintf(FERROR,"syntax error - %s does not take a value\n",tok); + rprintf(FERROR,"syntax error -- %s does not take a value\n",tok); { int on = socket_options[i].value; @@ -638,45 +722,15 @@ void set_socket_options(int fd, char *options) break; } - if (ret != 0) - rprintf(FERROR, "failed to set socket option %s: %s\n", tok, - strerror(errno)); + if (ret != 0) { + rsyserr(FERROR, errno, + "failed to set socket option %s", tok); + } } free(options); } -/** - * Become a daemon, discarding the controlling terminal - **/ -void become_daemon(void) -{ - int i; - - if (fork()) { - _exit(0); - } - - /* detach from the terminal */ -#ifdef HAVE_SETSID - setsid(); -#else -#ifdef TIOCNOTTY - i = open("/dev/tty", O_RDWR); - if (i >= 0) { - ioctl(i, (int)TIOCNOTTY, (char *)0); - close(i); - } -#endif /* TIOCNOTTY */ -#endif - /* make sure that stdin, stdout an stderr don't stuff things - * up (library functions, for example) */ - for (i = 0; i < 3; i++) { - close(i); - open("/dev/null", O_RDWR); - } -} - /** * This is like socketpair but uses tcp. It is used by the Samba @@ -703,7 +757,7 @@ static int socketpair_tcp(int fd[2]) goto failed; memset(&sock2, 0, sizeof sock2); -#if HAVE_SOCKADDR_IN_LEN +#ifdef HAVE_SOCKADDR_IN_LEN sock2.sin_len = sizeof sock2; #endif sock2.sin_family = PF_INET; @@ -733,14 +787,16 @@ static int socketpair_tcp(int fd[2]) goto failed; close(listener); + listener = -1; + + set_blocking(fd[1]); + if (connect_done == 0) { if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) != 0 && errno != EISCONN) goto failed; } - set_blocking(fd[1]); - /* all OK! */ return 0; @@ -767,23 +823,32 @@ static int socketpair_tcp(int fd[2]) **/ int sock_exec(const char *prog) { + pid_t pid; int fd[2]; if (socketpair_tcp(fd) != 0) { - rprintf(FERROR, RSYNC_NAME ": socketpair_tcp failed (%s)\n", - strerror(errno)); + rsyserr(FERROR, errno, "socketpair_tcp failed"); return -1; } - if (verbose >= 2) + if (DEBUG_GTE(CMD, 1)) rprintf(FINFO, "Running socket program: \"%s\"\n", prog); - if (fork() == 0) { + + pid = fork(); + if (pid < 0) { + rsyserr(FERROR, errno, "fork"); + exit_cleanup(RERR_IPC); + } + + if (pid == 0) { close(fd[0]); - close(0); - close(1); - dup(fd[1]); - dup(fd[1]); + if (dup2(fd[1], STDIN_FILENO) < 0 + || dup2(fd[1], STDOUT_FILENO) < 0) { + fprintf(stderr, "Failed to run \"%s\"\n", prog); + exit(1); + } exit(system(prog)); } + close(fd[1]); return fd[0]; }