-/* -*- c-file-style: "linux" -*-
-
- rsync -- fast file replication program
-
- Copyright (C) 1992-2001 by Andrew Tridgell <tridge@samba.org>
- Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
-
- 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 <tridge@samba.org>
+ * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
+ * Copyright (C) 2003-2020 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 "ifuncs.h"
+#ifdef HAVE_NETINET_IN_SYSTM_H
+#include <netinet/in_systm.h>
+#endif
+#ifdef HAVE_NETINET_IP_H
+#include <netinet/ip.h>
+#endif
+#include <netinet/tcp.h>
extern char *bind_address;
+extern char *sockopts;
extern int default_af_hint;
+extern int connect_timeout;
+extern int pid_file_fd;
#ifdef HAVE_SIGACTION
static struct sigaction sigact;
#endif
-/**
- * Establish a proxy connection on an open socket to a web proxy by
- * 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,
- char *proxy_user, char *proxy_pass)
+static int sock_exec(const char *prog);
+
+/* Establish a proxy connection on an open socket to a web proxy by 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, char *proxy_user, char *proxy_pass)
{
char *cp, buffer[1024];
char *authhdr, authbuf[1024];
authhdr = "";
}
- snprintf(buffer, sizeof buffer, "CONNECT %s:%d HTTP/1.0%s%s\r\n\r\n",
- host, port, authhdr, authbuf);
- len = strlen(buffer);
+ len = snprintf(buffer, sizeof buffer, "CONNECT %s:%d HTTP/1.0%s%s\r\n\r\n", host, port, authhdr, authbuf);
+ assert(len > 0 && len < (int)sizeof buffer);
if (write(fd, buffer, len) != len) {
rsyserr(FERROR, errno, "failed to write to proxy");
return -1;
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') {
}
-/**
- * Try to set the local address for a newly-created socket. Return -1
- * if this fails.
- **/
+/* 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,
const char *bind_addr)
{
return -1;
}
+/* connect() timeout handler based on alarm() */
+static void contimeout_handler(UNUSED(int val))
+{
+ connect_timeout = -1;
+}
-/**
- * Open a socket to a tcp remote host with the specified port .
+/* Open a socket to a tcp remote host with the specified port.
*
* Based on code from Warren. Proxy support by Stephen Rothwell.
* getaddrinfo() rewrite contributed by KAME.net.
*
- * Now that we support IPv6 we need to look up the remote machine's
- * address first, using @p af_hint to set a preference for the type
- * of address. Then depending on whether it has v4 or v6 addresses we
- * try to open a connection.
+ * Now that we support IPv6 we need to look up the remote machine's address
+ * first, using af_hint to set a preference for the type of address. Then
+ * depending on whether it has v4 or v6 addresses we try to open a connection.
*
- * The loop allows for machines with some addresses which may not be
- * reachable, perhaps because we can't e.g. route ipv6 to that network
- * but we can get ip4 packets through.
+ * The loop allows for machines with some addresses which may not be reachable,
+ * perhaps because we can't e.g. route ipv6 to that network but we can get ip4
+ * packets through.
*
- * @param bind_addr Local address to use. Normally NULL to bind
- * the wildcard address.
+ * 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_addr,
- int af_hint)
+ * af_hint: address family, e.g. AF_INET or AF_INET6. */
+int open_socket_out(char *host, int port, const char *bind_addr, int af_hint)
{
int type = SOCK_STREAM;
- int error, s;
+ int error, s, j, addr_cnt, *errnos;
struct addrinfo hints, *res0, *res;
char portbuf[10];
char *h, *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. */
+ * connection via a web proxy at the given address. */
h = getenv("RSYNC_PROXY");
proxied = h != NULL && *h != '\0';
}
*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);
}
return -1;
}
+ for (res = res0, addr_cnt = 0; res; res = res->ai_next, addr_cnt++) {}
+ errnos = new_array0(int, addr_cnt);
+
s = -1;
/* Try to connect to all addresses for this machine until we get
* through. It might e.g. be multi-homed, or have both IPv4 and IPv6
* addresses. We need to create a socket for each record, since the
* address record tells us what protocol to use to try to connect. */
- for (res = res0; res; res = res->ai_next) {
+ for (res = res0, j = 0; res; res = res->ai_next, j++) {
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s < 0)
continue;
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;
+ break;
+ }
+
+ if (connect_timeout > 0)
+ alarm(0);
+
+ if (s < 0) {
+ errnos[j] = errno;
continue;
}
- if (proxied
- && establish_proxy_connection(s, host, port,
- proxy_user, proxy_pass) != 0) {
+
+ if (proxied && establish_proxy_connection(s, host, port, proxy_user, proxy_pass) != 0) {
close(s);
s = -1;
continue;
}
+ if (DEBUG_GTE(CONNECT, 2)) {
+ char buf[2048];
+ if ((error = getnameinfo(res->ai_addr, res->ai_addrlen, buf, sizeof buf, NULL, 0, NI_NUMERICHOST)) != 0)
+ snprintf(buf, sizeof buf, "*getnameinfo failure: %s*", gai_strerror(error));
+ rprintf(FINFO, "Connected to %s (%s)\n", h, buf);
+ }
break;
}
- freeaddrinfo(res0);
- if (s < 0) {
- rsyserr(FERROR, errno, "failed to connect to %s", h);
- return -1;
+
+ if (s < 0 || DEBUG_GTE(CONNECT, 2)) {
+ char buf[2048];
+ for (res = res0, j = 0; res; res = res->ai_next, j++) {
+ if (errnos[j] == 0)
+ continue;
+ if ((error = getnameinfo(res->ai_addr, res->ai_addrlen, buf, sizeof buf, NULL, 0, NI_NUMERICHOST)) != 0)
+ snprintf(buf, sizeof buf, "*getnameinfo failure: %s*", gai_strerror(error));
+ rsyserr(FERROR, errnos[j], "failed to connect to %s (%s)", h, buf);
+ }
+ if (s < 0)
+ s = -1;
}
+
+ freeaddrinfo(res0);
+ free(errnos);
+
return s;
}
-/**
- * Open an outgoing socket, but allow for it to be intercepted by
+/* Open an outgoing socket, but allow for it to be intercepted by
* $RSYNC_CONNECT_PROG, which will execute a program across a TCP
* socketpair rather than really opening a socket.
*
*
* This is based on the Samba LIBSMB_PROG feature.
*
- * @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_addr,
- int af_hint)
+ * 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_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;
+ prog = new_array(char, len);
+ 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);
}
-
-/**
- * Open one or more sockets for incoming data using the specified type,
+/* Open one or more sockets for incoming data using the specified type,
* port, and address.
*
* The getaddrinfo() call may return several address results, e.g. for
* We return an array of file-descriptors to the sockets, with a trailing
* -1 value to indicate the end of the list.
*
- * @param bind_addr Local address to bind, or NULL to allow it to
- * default.
- **/
+ * 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_addr,
int af_hint)
{
socks = new_array(int, maxs + 1);
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
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) {
- if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
- (char *)&one, sizeof one) < 0
- && default_af_hint != AF_INET6) {
+ if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&one, sizeof one) < 0
+ && default_af_hint != AF_INET6) {
close(s);
continue;
}
if (bind(s, resp->ai_addr, resp->ai_addrlen) < 0) {
/* Nope, try another */
int r = asprintf(&errmsgs[ecnt++],
- "bind() failed: %s\n", strerror(errno));
+ "bind() failed: %s (address-family %d)\n",
+ strerror(errno), (int)resp->ai_family);
if (r < 0)
out_of_memory("open_socket_in");
close(s);
/* 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 || verbose > 1)
- rwrite(FLOG, errmsgs[s], strlen(errmsgs[s]));
+ if (!i || DEBUG_GTE(BIND, 1))
+ rwrite(FLOG, errmsgs[s], strlen(errmsgs[s]), 0);
free(errmsgs[s]);
}
free(errmsgs);
}
-/*
- * Determine if a file descriptor is in fact a socket
- */
+/* Determine if a file descriptor is in fact a socket. */
int is_a_socket(int fd)
{
int v;
}
-static RETSIGTYPE sigchld_handler(UNUSED(int val))
+static void sigchld_handler(UNUSED(int val))
{
#ifdef WNOHANG
while (waitpid(-1, NULL, WNOHANG) > 0) {}
/* ready to listen */
FD_ZERO(&deffds);
for (i = 0, maxfd = -1; sp[i] >= 0; i++) {
- if (listen(sp[i], 5) < 0) {
+ if (listen(sp[i], lp_listen_backlog()) < 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");
+ rprintf(FINFO, "Try using --ipv4 or --ipv6 to avoid this listen() error.\n");
}
#endif
exit_cleanup(RERR_SOCKETIO);
fds = deffds;
#endif
- if (select(maxfd + 1, &fds, NULL, NULL, NULL) != 1)
+ if (select(maxfd + 1, &fds, NULL, NULL, NULL) < 1)
continue;
for (i = 0, fd = -1; sp[i] >= 0; i++) {
if (FD_ISSET(sp[i], &fds)) {
- fd = accept(sp[i], (struct sockaddr *)&addr,
- &addrlen);
+ fd = accept(sp[i], (struct sockaddr *)&addr, &addrlen);
break;
}
}
if ((pid = fork()) == 0) {
int ret;
+ if (pid_file_fd >= 0)
+ close(pid_file_fd);
for (i = 0; sp[i] >= 0; i++)
close(sp[i]);
/* Re-open log file in child before possibly giving
} socket_options[] = {
{"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
{"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
+#ifdef SO_BROADCAST
{"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
+#endif
#ifdef TCP_NODELAY
{"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
#endif
#ifdef SO_RCVTIMEO
{"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
#endif
- {NULL,0,0,0,0}};
+ {NULL,0,0,0,0}
+};
-
-/**
- * Set user socket options
- **/
+/* Set user socket options. */
void set_socket_options(int fd, char *options)
{
char *tok;
options = strdup(options);
- if (!options)
- out_of_memory("set_socket_options");
-
for (tok = strtok(options, " \t,"); tok; tok = strtok(NULL," \t,")) {
int ret=0,i;
int value = 1;
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();
-#elif defined TIOCNOTTY
- i = open("/dev/tty", O_RDWR);
- if (i >= 0) {
- ioctl(i, (int)TIOCNOTTY, (char *)0);
- close(i);
- }
-#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
- * regression test code.
- *
- * The function guarantees that nobody else can attach to the socket,
- * or if they do that this function fails and the socket gets closed
- * returns 0 on success, -1 on failure the resulting file descriptors
- * are symmetrical.
- **/
+/* This is like socketpair but uses tcp. The function guarantees that nobody
+ * else can attach to the socket, or if they do that this function fails and
+ * the socket gets closed. Returns 0 on success, -1 on failure. The resulting
+ * file descriptors are symmetrical. Currently only for RSYNC_CONNECT_PROG. */
static int socketpair_tcp(int fd[2])
{
int listener;
sock2.sin_len = sizeof sock2;
#endif
sock2.sin_family = PF_INET;
+ sock2.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
- bind(listener, (struct sockaddr *)&sock2, sizeof sock2);
-
- if (listen(listener, 1) != 0)
- goto failed;
-
- if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0)
- goto failed;
-
- if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1)
+ if (bind(listener, (struct sockaddr *)&sock2, sizeof sock2) != 0
+ || listen(listener, 1) != 0
+ || getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0
+ || (fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1)
goto failed;
set_nonblocking(fd[1]);
} else
connect_done = 1;
- if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1)
+ if ((fd[0] = accept(listener, (struct sockaddr *)&sock2, &socklen)) == -1)
goto failed;
close(listener);
set_blocking(fd[1]);
if (connect_done == 0) {
- if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) != 0
- && errno != EISCONN)
+ if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) != 0 && errno != EISCONN)
goto failed;
}
}
-
-/**
- * Run a program on a local tcp socket, so that we can talk to it's
- * stdin and stdout. This is used to fake a connection to a daemon
- * for testing -- not for the normal case of running SSH.
+/* Run a program on a local tcp socket, so that we can talk to it's stdin and
+ * stdout. This is used to fake a connection to a daemon for testing -- not
+ * for the normal case of running SSH.
*
- * @return a socket which is attached to a subprocess running
- * "prog". stdin and stdout are attached. stderr is left attached to
- * the original stderr
- **/
-int sock_exec(const char *prog)
+ * Returns a socket which is attached to a subprocess running "prog". stdin and
+ * stdout are attached. stderr is left attached to the original stderr. */
+static int sock_exec(const char *prog)
{
+ pid_t pid;
int fd[2];
if (socketpair_tcp(fd) != 0) {
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]);
- exit(system(prog));
+ if (dup2(fd[1], STDIN_FILENO) < 0
+ || dup2(fd[1], STDOUT_FILENO) < 0) {
+ fprintf(stderr, "Failed to run \"%s\"\n", prog);
+ exit(1);
+ }
+ exit(shell_exec(prog));
}
+
close(fd[1]);
return fd[0];
}