X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/9c07d253451b9bcd898811fa46a76676b89dc014..a41a1e87182410ec6c2eeaddb0cd961ec554c404:/socket.c diff --git a/socket.c b/socket.c index 239c2995..5810c48b 100644 --- a/socket.c +++ b/socket.c @@ -33,27 +33,51 @@ #include "rsync.h" +extern char *bind_address; +extern int default_af_hint; /** * Establish a proxy connection on an open socket to a web proxy by - * using the HTTP CONNECT method. + * using the CONNECT method. If proxy_user and proxy_pass are not NULL, + * they are used to authenticate to the proxy using the "Basic" + * proxy-authorization protocol **/ -static int establish_proxy_connection(int fd, char *host, int port) +static int establish_proxy_connection(int fd, char *host, int port, + char *proxy_user, char *proxy_pass) { - char buffer[1024]; - char *cp; + char *cp, buffer[1024]; + char *authhdr, authbuf[1024]; + int len; + + if (proxy_user && proxy_pass) { + stringjoin(buffer, sizeof buffer, + proxy_user, ":", proxy_pass, NULL); + len = strlen(buffer); + + if ((len*8 + 5) / 6 >= (int)sizeof authbuf) { + rprintf(FERROR, + "authentication information is too long\n"); + return -1; + } + + base64_encode(buffer, len, authbuf); + authhdr = "\r\nProxy-Authorization: Basic "; + } else { + *authbuf = '\0'; + authhdr = ""; + } - snprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port); - if (write(fd, buffer, strlen(buffer)) != (int)strlen(buffer)) { - rprintf(FERROR, "failed to write to proxy: %s\n", - strerror(errno)); + snprintf(buffer, sizeof buffer, "CONNECT %s:%d HTTP/1.0%s%s\r\n\r\n", + host, port, authhdr, authbuf); + len = strlen(buffer); + if (write(fd, buffer, len) != len) { + rsyserr(FERROR, errno, "failed to write to proxy"); return -1; } - for (cp = buffer; cp < &buffer[sizeof (buffer) - 1]; cp++) { + 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') @@ -80,11 +104,10 @@ static int establish_proxy_connection(int fd, char *host, int port) } /* throw away the rest of the HTTP header */ while (1) { - for (cp = buffer; cp < &buffer[sizeof (buffer) - 1]; - cp++) { + 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') @@ -103,14 +126,13 @@ static int establish_proxy_connection(int fd, char *host, int port) * Try to set the local address for a newly-created socket. Return -1 * if this fails. **/ -int try_bind_local(int s, - int ai_family, int ai_socktype, +int try_bind_local(int s, int ai_family, int ai_socktype, const char *bind_address) { int error; struct addrinfo bhints, *bres_all, *r; - memset(&bhints, 0, sizeof(bhints)); + memset(&bhints, 0, sizeof bhints); bhints.ai_family = ai_family; bhints.ai_socktype = ai_socktype; bhints.ai_flags = AI_PASSIVE; @@ -159,42 +181,59 @@ int open_socket_out(char *host, int port, const char *bind_address, int af_hint) { int type = SOCK_STREAM; - int error; - int s; + int error, s; struct addrinfo hints, *res0, *res; char portbuf[10]; - char *h; + char *h, *cp; int proxied = 0; char buffer[1024]; - char *cp; + char *proxy_user = NULL, *proxy_pass = NULL; /* if we have a RSYNC_PROXY env variable then redirect our - * connetcion via a web proxy at the given address. The format - * is hostname:port */ + * connetcion via a web proxy at the given address. */ h = getenv("RSYNC_PROXY"); proxied = h != NULL && *h != '\0'; if (proxied) { - strlcpy(buffer, h, sizeof(buffer)); - cp = strchr(buffer, ':'); - if (cp == NULL) { + strlcpy(buffer, h, sizeof buffer); + + /* Is the USER:PASS@ prefix present? */ + if ((cp = strchr(buffer, '@')) != NULL) { + *cp++ = '\0'; + /* The remainder is the HOST:PORT part. */ + h = cp; + + if ((cp = strchr(buffer, ':')) == NULL) { + rprintf(FERROR, + "invalid proxy specification: should be USER:PASS@HOST:PORT\n"); + return -1; + } + *cp++ = '\0'; + + proxy_user = buffer; + proxy_pass = cp; + } else { + /* The whole buffer is the HOST:PORT part. */ + h = buffer; + } + + if ((cp = strchr(h, ':')) == NULL) { rprintf(FERROR, "invalid proxy specification: should be HOST:PORT\n"); return -1; } *cp++ = '\0'; - strcpy(portbuf, cp); - h = buffer; + strlcpy(portbuf, cp, sizeof portbuf); if (verbose >= 2) { rprintf(FINFO, "connection via http proxy %s port %s\n", h, portbuf); } } else { - snprintf(portbuf, sizeof(portbuf), "%d", port); + snprintf(portbuf, sizeof portbuf, "%d", port); h = host; } - memset(&hints, 0, sizeof(hints)); + memset(&hints, 0, sizeof hints); hints.ai_family = af_hint; hints.ai_socktype = type; error = getaddrinfo(h, portbuf, &hints, &res0); @@ -214,31 +253,30 @@ int open_socket_out(char *host, int port, const char *bind_address, if (s < 0) continue; - if (bind_address) - if (try_bind_local(s, res->ai_family, type, - bind_address) == -1) { - close(s); - s = -1; - continue; - } - + if (bind_address + && try_bind_local(s, res->ai_family, type, + bind_address) == -1) { + close(s); + s = -1; + continue; + } if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { close(s); s = -1; continue; } - if (proxied && - establish_proxy_connection(s, host, port) != 0) { + if (proxied + && establish_proxy_connection(s, host, port, + proxy_user, proxy_pass) != 0) { close(s); s = -1; continue; - } else - break; + } + break; } 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; @@ -260,9 +298,14 @@ int open_socket_out(char *host, int port, const char *bind_address, int open_socket_out_wrapped(char *host, int port, const char *bind_address, int af_hint) { - char *prog; + char *prog = getenv("RSYNC_CONNECT_PROG"); - if ((prog = getenv("RSYNC_CONNECT_PROG")) != NULL) + if (verbose >= 2) { + 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); } @@ -270,76 +313,93 @@ int open_socket_out_wrapped(char *host, int port, const char *bind_address, /** - * 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 * default. **/ -static int open_socket_in(int type, int port, const char *bind_address, - int af_hint) +static int *open_socket_in(int type, int port, const char *bind_address, + int af_hint) { - int one=1; - int s; + int one = 1; + int s, *socks, maxs, i; struct addrinfo hints, *all_ai, *resp; char portbuf[10]; int error; - memset(&hints, 0, sizeof(hints)); + memset(&hints, 0, sizeof hints); hints.ai_family = af_hint; hints.ai_socktype = type; hints.ai_flags = AI_PASSIVE; - snprintf(portbuf, sizeof(portbuf), "%d", port); + snprintf(portbuf, sizeof portbuf, "%d", port); error = getaddrinfo(bind_address, portbuf, &hints, &all_ai); if (error) { rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", bind_address, gai_strerror(error)); - return -1; + return NULL; } + /* Count max number of sockets we might open. */ + for (maxs = 0, resp = all_ai; resp; resp = resp->ai_next, maxs++) {} + + if (!(socks = new_array(int, maxs + 1))) + 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. */ - for (resp = all_ai; resp; resp = resp->ai_next) { + for (resp = all_ai, i = 0; resp; resp = resp->ai_next) { s = socket(resp->ai_family, resp->ai_socktype, resp->ai_protocol); - if (s == -1) + if (s == -1) { /* See if there's another address that will work... */ continue; + } setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof one); - /* now we've got a socket - we need to bind it */ - if (bind(s, all_ai->ai_addr, all_ai->ai_addrlen) < 0) { +#ifdef IPV6_V6ONLY + if (resp->ai_family == AF_INET6) { + 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 */ close(s); continue; } - freeaddrinfo(all_ai); - return s; + socks[i++] = s; } + socks[i] = -1; - rprintf(FERROR, RSYNC_NAME ": open inbound socket on port %d failed: " - "%s\n", - port, - strerror(errno)); + if (all_ai) + freeaddrinfo(all_ai); - freeaddrinfo(all_ai); - return -1; + if (!i) { + rprintf(FERROR, + "unable to bind any inbound sockets on port %d\n", + port); + free(socks); + return NULL; + } + return socks; } @@ -349,55 +409,65 @@ static int open_socket_in(int type, int port, const char *bind_address, int is_a_socket(int fd) { int v; - socklen_t l; - l = sizeof(int); - - /* Parameters to getsockopt, setsockopt etc are very - * unstandardized across platforms, so don't be surprised if - * there are compiler warnings on e.g. SCO OpenSwerver or AIX. - * It seems they all eventually get the right idea. - * - * Debian says: ``The fifth argument of getsockopt and - * setsockopt is in reality an int [*] (and this is what BSD - * 4.* and libc4 and libc5 have). Some POSIX confusion - * resulted in the present socklen_t. The draft standard has - * not been adopted yet, but glibc2 already follows it and - * also has socklen_t [*]. See also accept(2).'' - * - * We now return to your regularly scheduled programming. */ + socklen_t l = sizeof (int); + + /* Parameters to getsockopt, setsockopt etc are very + * unstandardized across platforms, so don't be surprised if + * there are compiler warnings on e.g. SCO OpenSwerver or AIX. + * It seems they all eventually get the right idea. + * + * Debian says: ``The fifth argument of getsockopt and + * setsockopt is in reality an int [*] (and this is what BSD + * 4.* and libc4 and libc5 have). Some POSIX confusion + * resulted in the present socklen_t. The draft standard has + * not been adopted yet, but glibc2 already follows it and + * also has socklen_t [*]. See also accept(2).'' + * + * We now return to your regularly scheduled programming. */ return getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0; } static RETSIGTYPE sigchld_handler(UNUSED(int val)) { - signal(SIGCHLD, sigchld_handler); #ifdef WNOHANG while (waitpid(-1, NULL, WNOHANG) > 0) {} #endif + signal(SIGCHLD, sigchld_handler); } void start_accept_loop(int port, int (*fn)(int, int)) { - int s; - extern char *bind_address; - extern int default_af_hint; + fd_set deffds; + int *sp, maxfd, i; /* open an incoming socket */ - s = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint); - if (s == -1) + sp = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint); + if (sp == NULL) exit_cleanup(RERR_SOCKETIO); /* ready to listen */ - if (listen(s, 5) == -1) { - close(s); - exit_cleanup(RERR_SOCKETIO); + FD_ZERO(&deffds); + 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."); + } +#endif + exit_cleanup(RERR_SOCKETIO); + } + FD_SET(sp[i], &deffds); + if (maxfd < sp[i]) + maxfd = sp[i]; } /* now accept incoming connections - forking a new process - for each incoming connection */ + * for each incoming connection */ while (1) { fd_set fds; pid_t pid; @@ -406,40 +476,45 @@ void start_accept_loop(int port, int (*fn)(int, int)) socklen_t addrlen = sizeof addr; /* close log file before the potentially very long select so - file can be trimmed by another process instead of growing - forever */ + * file can be trimmed by another process instead of growing + * forever */ log_close(); - FD_ZERO(&fds); - FD_SET(s, &fds); - - if (select(s+1, &fds, NULL, NULL, NULL) != 1) - continue; +#ifdef FD_COPY + FD_COPY(&deffds, &fds); +#else + fds = deffds; +#endif - if (!FD_ISSET(s, &fds)) + if (select(maxfd + 1, &fds, NULL, NULL, NULL) != 1) continue; - fd = accept(s,(struct sockaddr *)&addr,&addrlen); + for (i = 0, fd = -1; sp[i] >= 0; i++) { + if (FD_ISSET(sp[i], &fds)) { + fd = accept(sp[i], (struct sockaddr *)&addr, + &addrlen); + break; + } + } - if (fd == -1) + if (fd < 0) continue; signal(SIGCHLD, sigchld_handler); if ((pid = fork()) == 0) { int ret; - close(s); + for (i = 0; sp[i] >= 0; i++) + close(sp[i]); /* open log file in child before possibly giving - up privileges */ + * up privileges */ log_open(); 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 @@ -450,6 +525,7 @@ void start_accept_loop(int port, int (*fn)(int, int)) close(fd); } } + free(sp); } @@ -538,7 +614,8 @@ void set_socket_options(int fd, char *options) case OPT_BOOL: case OPT_INT: ret = setsockopt(fd,socket_options[i].level, - socket_options[i].option,(char *)&value,sizeof(int)); + socket_options[i].option, + (char *)&value, sizeof (int)); break; case OPT_ON: @@ -548,14 +625,16 @@ void set_socket_options(int fd, char *options) { int on = socket_options[i].value; ret = setsockopt(fd,socket_options[i].level, - socket_options[i].option,(char *)&on,sizeof(int)); + socket_options[i].option, + (char *)&on, sizeof (int)); } 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); @@ -585,7 +664,7 @@ void become_daemon(void) #endif /* TIOCNOTTY */ #endif /* make sure that stdin, stdout an stderr don't stuff things - up (library functions, for example) */ + * up (library functions, for example) */ for (i = 0; i < 3; i++) { close(i); open("/dev/null", O_RDWR); @@ -607,23 +686,23 @@ static int socketpair_tcp(int fd[2]) int listener; struct sockaddr_in sock; struct sockaddr_in sock2; - socklen_t socklen = sizeof(sock); + socklen_t socklen = sizeof sock; int connect_done = 0; fd[0] = fd[1] = listener = -1; - memset(&sock, 0, sizeof(sock)); + memset(&sock, 0, sizeof sock); if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; - memset(&sock2, 0, sizeof(sock2)); -#ifdef HAVE_SOCKADDR_LEN - sock2.sin_len = sizeof(sock2); + memset(&sock2, 0, sizeof sock2); +#if HAVE_SOCKADDR_IN_LEN + sock2.sin_len = sizeof sock2; #endif - sock2.sin_family = PF_INET; + sock2.sin_family = PF_INET; - bind(listener, (struct sockaddr *)&sock2, sizeof(sock2)); + bind(listener, (struct sockaddr *)&sock2, sizeof sock2); if (listen(listener, 1) != 0) goto failed; @@ -638,7 +717,7 @@ static int socketpair_tcp(int fd[2]) sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); - if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) == -1) { + if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) == -1) { if (errno != EINPROGRESS) goto failed; } else @@ -648,14 +727,16 @@ 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 + if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) != 0 && errno != EISCONN) goto failed; } - set_blocking(fd[1]); - /* all OK! */ return 0; @@ -685,22 +766,17 @@ int sock_exec(const char *prog) 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) + rprintf(FINFO, "Running socket program: \"%s\"\n", prog); if (fork() == 0) { close(fd[0]); close(0); close(1); dup(fd[1]); dup(fd[1]); - if (verbose > 3) { - /* Can't use rprintf because we've forked. */ - fprintf(stderr, - RSYNC_NAME ": execute socket program \"%s\"\n", - prog); - } exit(system(prog)); } close(fd[1]);