-/* -*- c-file-style: "linux" -*-
-
- 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) 2003-2018 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"
+#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;
+
+#ifdef HAVE_SIGACTION
+static struct sigaction sigact;
+#endif
+
+static int sock_exec(const char *prog);
-/* Establish a proxy connection on an open socket to a web roxy by
- * using the CONNECT method. */
-static int establish_proxy_connection(int fd, char *host, int port)
+/* 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 buffer[1024];
- char *cp;
+ char *cp, buffer[1024];
+ char *authhdr, authbuf[1024];
+ int len;
- snprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port);
- if (write(fd, buffer, strlen(buffer)) != strlen(buffer)) {
- rprintf(FERROR, "failed to write to proxy: %s\n",
- strerror(errno));
+ 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 - 3) {
+ rprintf(FERROR,
+ "authentication information is too long\n");
+ return -1;
+ }
+
+ base64_encode(buffer, len, authbuf, 1);
+ authhdr = "\r\nProxy-Authorization: Basic ";
+ } else {
+ *authbuf = '\0';
+ authhdr = "";
+ }
+
+ 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')
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(*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;
}
/* 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')
break;
}
- if ((cp > buffer) && (*cp == '\n'))
+ if (cp > buffer && *cp == '\n')
cp--;
- if ((cp == buffer) && ((*cp == '\n') || (*cp == '\r')))
+ if (cp == buffer && (*cp == '\n' || *cp == '\r'))
break;
}
return 0;
}
-/**
- * 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_address)
+/* 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)
{
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;
- if (getaddrinfo(bind_address, NULL, &bhints, &bres_all) == -1) {
+ 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;
}
for (r = bres_all; r; r = r->ai_next) {
if (bind(s, r->ai_addr, r->ai_addrlen) == -1)
continue;
+ freeaddrinfo(bres_all);
return s;
}
/* no error message; there might be some problem that allows
* creation of the socket but not binding, perhaps if the
* machine has no ipv6 address of this name. */
+ freeaddrinfo(bres_all);
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_address 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_address,
+ * 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;
- int s;
- int result;
+ int error, s, j, addr_cnt, *errnos;
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');
+ 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 = strrchr(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 (DEBUG_GTE(CONNECT, 1)) {
+ 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);
return -1;
}
+ for (res = res0, addr_cnt = 0; res; res = res->ai_next, addr_cnt++) {}
+ errnos = new_array0(int, addr_cnt);
+ if (!errnos)
+ out_of_memory("open_socket_out");
+
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;
- if (bind_address)
- if (try_bind_local(s, res->ai_family, type,
- bind_address) == -1) {
- close(s);
- s = -1;
- continue;
- }
+ if (bind_addr
+ && try_bind_local(s, res->ai_family, type,
+ bind_addr) == -1) {
+ close(s);
+ s = -1;
+ continue;
+ }
+ if (connect_timeout > 0) {
+ SIGACTION(SIGALRM, contimeout_handler);
+ alarm(connect_timeout);
+ }
- if (connect(s, res->ai_addr, res->ai_addrlen) < 0) {
+ 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) != 0) {
+
+ if (proxied
+ && establish_proxy_connection(s, host, port,
+ proxy_user, proxy_pass) != 0) {
close(s);
s = -1;
continue;
- } else
- break;
+ }
+ 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) {
- rprintf(FERROR, RSYNC_NAME ": failed to connect to %s: %s\n",
- h, strerror(errno));
- 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_address 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 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;
+ char *prog = getenv("RSYNC_CONNECT_PROG");
+
+ 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 ((prog = getenv ("RSYNC_CONNECT_PROG")) != NULL)
- return sock_exec (prog);
- else
- return open_socket_out (host, port, bind_address,
- af_hint);
+ 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_addr, af_hint);
}
-
-/**
- * Open a socket of the specified type, port and address for incoming data
+/* 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
+ * the machine's IPv4 and IPv6 name.
+ *
+ * We return an array of file-descriptors to the sockets, with a trailing
+ * -1 value to indicate the end of the list.
*
- * 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.
- *
- * 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.
- *
- * 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.
- *
- * @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)
+ * 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)
{
- int one=1;
- int s;
+ 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));
+ 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);
- error = getaddrinfo(bind_address, portbuf, &hints, &all_ai);
+ snprintf(portbuf, sizeof portbuf, "%d", port);
+ 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));
- return -1;
+ 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);
+ 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. */
- 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)
+ 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);
-
- /* now we've got a socket - we need to bind it */
- if (bind(s, all_ai->ai_addr, all_ai->ai_addrlen) < 0) {
+ 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) {
+ 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;
}
-
- return s;
+
+ socks[i++] = s;
}
+ socks[i] = -1;
+
+ if (all_ai)
+ freeaddrinfo(all_ai);
- rprintf(FERROR, RSYNC_NAME ": open inbound socket on port %d failed: "
- "%s\n",
- port,
- strerror(errno));
+ /* 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);
- 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;
}
-/*
- * 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;
- 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. */
- return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
+ 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 void 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 ))
+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;
+
+#ifdef HAVE_SIGACTION
+ sigact.sa_flags = SA_NOCLDSTOP;
+#endif
/* 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], 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");
+ }
+#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;
int fd;
struct sockaddr_storage addr;
- int addrlen = sizeof(addr);
+ 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 */
- log_close();
+ * file can be trimmed by another process instead of growing
+ * forever */
+ logfile_close();
- FD_ZERO(&fds);
- FD_SET(s, &fds);
+#ifdef FD_COPY
+ FD_COPY(&deffds, &fds);
+#else
+ fds = deffds;
+#endif
- if (select(s+1, &fds, NULL, NULL, NULL) != 1) {
+ if (select(maxfd + 1, &fds, NULL, NULL, NULL) < 1)
continue;
- }
- if(!FD_ISSET(s, &fds)) continue;
-
- fd = accept(s,(struct sockaddr *)&addr,&addrlen);
-
- if (fd == -1) continue;
-
- signal(SIGCHLD, SIG_IGN);
+ for (i = 0, fd = -1; sp[i] >= 0; i++) {
+ if (FD_ISSET(sp[i], &fds)) {
+ fd = accept(sp[i], (struct sockaddr *)&addr,
+ &addrlen);
+ break;
+ }
+ }
- /* we shouldn't have any children left hanging around
- but I have had reports that on Digital Unix zombies
- are produced, so this ensures that they are reaped */
-#ifdef WNOHANG
- while (waitpid(-1, NULL, WNOHANG) > 0);
-#endif
+ if (fd < 0)
+ continue;
- if (fork()==0) {
- close(s);
- /* open log file in child before possibly giving
- up privileges */
- log_open();
- _exit(fn(fd));
+ SIGACTION(SIGCHLD, sigchld_handler);
+
+ if ((pid = fork()) == 0) {
+ int ret;
+ 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) {
+ rsyserr(FERROR, errno,
+ "could not create child server process");
+ close(fd);
+ /* This might have happened because we're
+ * overloaded. Sleep briefly before trying to
+ * accept again. */
+ sleep(2);
+ } else {
+ /* Parent doesn't need this fd anymore. */
+ close(fd);
}
-
- close(fd);
}
}
} 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;
- if (!options || !*options) return;
+
+ if (!options || !*options)
+ return;
options = strdup(options);
-
- if (!options) out_of_memory("set_socket_options");
- for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) {
+ 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;
char *p;
got_value = 1;
}
- for (i=0;socket_options[i].name;i++)
+ for (i = 0; socket_options[i].name; i++) {
if (strcmp(socket_options[i].name,tok)==0)
break;
+ }
if (!socket_options[i].name) {
rprintf(FERROR,"Unknown socket option %s\n",tok);
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:
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;
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));
- }
-
- 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);
- }
-}
-
-/**
- * Return the IP addr of the client as a string
- **/
-char *client_addr(int fd)
-{
- struct sockaddr_storage ss;
- int length = sizeof(ss);
- static char addr_buf[100];
- static int initialised;
-
- if (initialised) return addr_buf;
-
- initialised = 1;
-
- if (getpeername(fd, (struct sockaddr *)&ss, &length)) {
- exit_cleanup(RERR_SOCKETIO);
- }
-
- getnameinfo((struct sockaddr *)&ss, length,
- addr_buf, sizeof(addr_buf), NULL, 0, NI_NUMERICHOST);
- return addr_buf;
-}
-
-
-static int get_sockaddr_family(const struct sockaddr_storage *ss)
-{
- return ((struct sockaddr *) ss)->sa_family;
-}
-
-
-/**
- * Return the DNS name of the client
- **/
-char *client_name(int fd)
-{
- struct sockaddr_storage ss;
- int length = sizeof(ss);
- static char name_buf[100];
- static char port_buf[100];
- char *def = "UNKNOWN";
- static int initialised;
- struct addrinfo hints, *res, *res0;
- int error;
-
- if (initialised) return name_buf;
-
- initialised = 1;
-
- strcpy(name_buf,def);
-
- if (getpeername(fd, (struct sockaddr *)&ss, &length)) {
- /* FIXME: Can we really not continue? */
- rprintf(FERROR, RSYNC_NAME ": getpeername on fd%d failed: %s\n",
- fd, strerror(errno));
- exit_cleanup(RERR_SOCKETIO);
- }
-
-#ifdef INET6
- if (get_sockaddr_family(&ss) == AF_INET6 &&
- IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&ss)->sin6_addr)) {
- /* OK, so ss is in the IPv6 family, but it is really
- * an IPv4 address: something like
- * "::ffff:10.130.1.2". If we use it as-is, then the
- * reverse lookup might fail or perhaps something else
- * bad might happen. So instead we convert it to an
- * equivalent address in the IPv4 address family. */
- struct sockaddr_in6 sin6;
- struct sockaddr_in *sin;
-
- memcpy(&sin6, &ss, sizeof(sin6));
- sin = (struct sockaddr_in *)&ss;
- memset(sin, 0, sizeof(*sin));
- sin->sin_family = AF_INET;
- length = sizeof(struct sockaddr_in);
-#ifdef HAVE_SOCKADDR_LEN
- sin->sin_len = length;
-#endif
- sin->sin_port = sin6.sin6_port;
- /* FIXME: Isn't there a macro we can use here rather
- * than grovelling through the struct? It might be
- * wrong on some systems. */
- memcpy(&sin->sin_addr, &sin6.sin6_addr.s6_addr[12],
- sizeof(sin->sin_addr));
- }
-#endif
-
- /* reverse lookup */
- if (getnameinfo((struct sockaddr *)&ss, length,
- name_buf, sizeof(name_buf), port_buf, sizeof(port_buf),
- NI_NAMEREQD | NI_NUMERICSERV) != 0) {
- strcpy(name_buf, def);
- rprintf(FERROR, "reverse name lookup failed\n");
- }
-
- /* forward lookup */
- memset(&hints, 0, sizeof(hints));
- hints.ai_family = PF_UNSPEC;
- hints.ai_flags = AI_CANONNAME;
- hints.ai_socktype = SOCK_STREAM;
- error = getaddrinfo(name_buf, port_buf, &hints, &res0);
- if (error) {
- strcpy(name_buf, def);
- rprintf(FERROR,
- RSYNC_NAME ": forward name lookup for %s failed: %s\n",
- port_buf,
- gai_strerror(error));
- return name_buf;
- }
-
- /* XXX sin6_flowinfo and other fields */
- for (res = res0; res; res = res->ai_next) {
- if (res->ai_family != get_sockaddr_family(&ss))
- continue;
- if (res->ai_addrlen != length)
- continue;
- if (memcmp(res->ai_addr, &ss, res->ai_addrlen) == 0)
break;
- }
+ }
- if (res == NULL) {
- strcpy(name_buf, def);
- rprintf(FERROR, RSYNC_NAME ": "
- "reverse name lookup for \"%s\" failed on fd%d - spoofed address? \n",
- name_buf, fd);
+ if (ret != 0) {
+ rsyserr(FERROR, errno,
+ "failed to set socket option %s", tok);
+ }
}
- freeaddrinfo(res0);
- return name_buf;
+ free(options);
}
-/*******************************************************************
-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;
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));
-
- if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed;
- memset(&sock2, 0, sizeof(sock2));
-#ifdef HAVE_SOCK_SIN_LEN
- sock2.sin_len = sizeof(sock2);
-#endif
- sock2.sin_family = PF_INET;
+ fd[0] = fd[1] = listener = -1;
- bind(listener, (struct sockaddr *)&sock2, sizeof(sock2));
+ memset(&sock, 0, sizeof sock);
- if (listen(listener, 1) != 0) goto failed;
+ if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1)
+ goto failed;
- if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) goto failed;
+ memset(&sock2, 0, sizeof sock2);
+#ifdef HAVE_SOCKADDR_IN_LEN
+ sock2.sin_len = sizeof sock2;
+#endif
+ sock2.sin_family = PF_INET;
+ sock2.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
- if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed;
+ 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]);
sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
- if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) == -1) {
- if (errno != EINPROGRESS) goto failed;
- } else {
+ if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) == -1) {
+ if (errno != EINPROGRESS)
+ goto failed;
+ } else
connect_done = 1;
- }
- if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) goto failed;
+ if ((fd[0] = accept(listener, (struct sockaddr *)&sock2, &socklen)) == -1)
+ 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;
+ if (connect(fd[1], (struct sockaddr *)&sock, sizeof sock) != 0
+ && errno != EISCONN)
+ goto failed;
}
- set_blocking (fd[1]);
-
/* all OK! */
return 0;
failed:
- if (fd[0] != -1) close(fd[0]);
- if (fd[1] != -1) close(fd[1]);
- if (listener != -1) close(listener);
+ if (fd[0] != -1)
+ close(fd[0]);
+ if (fd[1] != -1)
+ close(fd[1]);
+ if (listener != -1)
+ close(listener);
return -1;
}
-/*******************************************************************
-run a program on a local tcp socket, this is used to launch smbd
-when regression testing
-the return value is 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)
+/* 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.
+ *
+ * Retruns 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) {
- rprintf (FERROR, RSYNC_NAME
- ": socketpair_tcp failed (%s)\n",
- strerror(errno));
+ rsyserr(FERROR, errno, "socketpair_tcp failed");
return -1;
}
- if (fork() == 0) {
+ if (DEBUG_GTE(CMD, 1))
+ rprintf(FINFO, "Running socket program: \"%s\"\n", prog);
+
+ 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 (verbose > 3)
- fprintf (stderr,
- RSYNC_NAME ": execute socket program \"%s\"\n",
- prog);
- 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]);
+
+ close(fd[1]);
return fd[0];
}
-
-
-