-/* -*- c-file-style: "linux" -*-
-
- Copyright (C) 1992-2001 by Andrew Tridgell <tridge@samba.org>
- Copyright (C) 2001 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.
-*/
-
/*
- socket functions used in rsync
+ * Socket functions used in rsync.
+ *
+ * Copyright (C) 1992-2001 Andrew Tridgell <tridge@samba.org>
+ * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
+ * Copyright (C) 2003-2007 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. */
#include "rsync.h"
+#include "ifuncs.h"
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
-#ifndef HAVE_GETADDRINFO
-#include "lib/addrinfo.h"
-#endif
+extern char *bind_address;
+extern int default_af_hint;
-extern int af;
+#ifdef HAVE_SIGACTION
+static struct sigaction sigact;
+#endif
-/* 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_addr)
+{
+ int error;
+ struct addrinfo bhints, *bres_all, *r;
+
+ memset(&bhints, 0, sizeof bhints);
+ bhints.ai_family = ai_family;
+ bhints.ai_socktype = ai_socktype;
+ bhints.ai_flags = AI_PASSIVE;
+ if ((error = getaddrinfo(bind_addr, NULL, &bhints, &bres_all))) {
+ rprintf(FERROR, RSYNC_NAME ": getaddrinfo %s: %s\n",
+ 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;
+}
-/** 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.
*
- * Based on code from Warren. Proxy support by Stephen Rothwell
+ * 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.
*
+ * 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 get the stack default.
+ * @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;
- int error;
- int s;
- int result;
+ 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');
+ 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 (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));
- hints.ai_family = af;
+ memset(&hints, 0, sizeof hints);
+ hints.ai_family = af_hint;
hints.ai_socktype = type;
error = getaddrinfo(h, portbuf, &hints, &res0);
if (error) {
- rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s: %s\n", portbuf, gai_strerror(error));
+ rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s %s: %s\n",
+ h, portbuf, gai_strerror(error));
return -1;
}
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) {
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s < 0)
continue;
- if (bind_address) {
- struct addrinfo bhints, *bres;
-
- memset(&bhints, 0, sizeof(bhints));
- bhints.ai_family = res->ai_family;
- bhints.ai_socktype = type;
- bhints.ai_flags = AI_PASSIVE;
- error = getaddrinfo(bind_address, NULL, &bhints, &bres);
- if (error) {
- rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n",
- bind_address, gai_strerror(error));
- continue;
- }
- if (bres->ai_next) {
- rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s resolved to multiple hosts\n",
- bind_address);
- freeaddrinfo(bres);
- continue;
- }
- bind(s, bres->ai_addr, bres->ai_addrlen);
+ if (bind_addr
+ && try_bind_local(s, res->ai_family, type,
+ bind_addr) == -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;
*
* 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;
+ 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);
+ 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_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.
*
- * @param bind_address Local address to bind, or NULL to allow it to
+ * 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.
**/
-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;
- struct addrinfo hints, *res;
- char portbuf[10];
+ int one = 1;
+ int s, *socks, maxs, i, ecnt;
+ struct addrinfo hints, *all_ai, *resp;
+ char portbuf[10], **errmsgs;
int error;
- memset(&hints, 0, sizeof(hints));
- hints.ai_family = af;
+ 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, &res);
+ 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;
- }
- if (res->ai_next) {
- rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: "
- "resolved to multiple hosts\n",
- bind_address);
- freeaddrinfo(res);
- return -1;
+ bind_addr, gai_strerror(error));
+ return NULL;
}
- s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
- if (s < 0) {
- rprintf(FERROR, RSYNC_NAME ": open socket in failed: %s\n",
- strerror(errno));
- freeaddrinfo(res);
- return -1;
+ /* 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, 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);
+
+#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;
+ }
+
+ socks[i++] = s;
}
+ socks[i] = -1;
- setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one));
+ if (all_ai)
+ freeaddrinfo(all_ai);
- /* now we've got a socket - we need to bind it */
- if (bind(s, res->ai_addr, res->ai_addrlen) < 0) {
- rprintf(FERROR, RSYNC_NAME ": bind failed on port %d\n", port);
- freeaddrinfo(res);
- close(s);
- return -1;
+ /* 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]), 0);
+ free(errmsgs[s]);
}
+ free(errmsgs);
- return s;
+ if (!i) {
+ rprintf(FERROR,
+ "unable to bind any inbound sockets on port %d\n",
+ port);
+ free(socks);
+ return NULL;
+ }
+ return socks;
}
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;
}
-void start_accept_loop(int port, int (*fn)(int ))
+static RETSIGTYPE sigchld_handler(UNUSED(int val))
{
- int s;
- extern char *bind_address;
+#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;
+
+#ifdef HAVE_SIGACTION
+ sigact.sa_flags = SA_NOCLDSTOP;
+#endif
/* open an incoming socket */
- s = open_socket_in(SOCK_STREAM, port, bind_address);
- 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.\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 in_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,&in_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);
}
}
#endif
{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;
+ break;
+ }
+
+ if (ret != 0) {
+ rsyserr(FERROR, errno,
+ "failed to set socket option %s", tok);
}
-
- 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
-****************************************************************************/
+/**
+ * Become a daemon, discarding the controlling terminal
+ **/
void become_daemon(void)
{
int i;
/* detach from the terminal */
#ifdef HAVE_SETSID
setsid();
-#else
-#ifdef TIOCNOTTY
+#elif defined TIOCNOTTY
i = open("/dev/tty", O_RDWR);
if (i >= 0) {
- ioctl(i, (int) TIOCNOTTY, (char *)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);
+ * 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;
-}
-
-
-/*******************************************************************
- 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)) {
- exit_cleanup(RERR_SOCKETIO);
- }
-
-#ifdef INET6
- if (ss.ss_family == AF_INET6 &&
- IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&ss)->sin6_addr)) {
- 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;
- 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 != ss.ss_family)
- continue;
- if (res->ai_addrlen != length)
- continue;
- if (memcmp(res->ai_addr, &ss, res->ai_addrlen) == 0)
- break;
- }
-
- /* TODO: Do a forward lookup as well to prevent spoofing */
-
- if (res == NULL) {
- strcpy(name_buf, def);
- rprintf(FERROR,
- "reverse name lookup mismatch - spoofed address?\n");
- }
-
- freeaddrinfo(res0);
- return name_buf;
-}
/**
- Convert a string to an IP address. The string can be a name or
- dotted decimal number.
-
- Returns a pointer to a static in_addr struct -- if you call this
- more than once then you should copy it.
-*/
-struct in_addr *ip_address(const char *str)
-{
- static struct in_addr ret;
- struct hostent *hp;
-
- if (!str) {
- rprintf (FERROR, "ip_address received NULL name\n");
- return NULL;
- }
-
- /* try as an IP address */
- if (inet_aton(str, &ret) != 0) {
- return &ret;
- }
-
- /* otherwise assume it's a network name of some sort and use
- gethostbyname */
- if ((hp = gethostbyname (str)) == 0) {
- rprintf(FERROR, "gethostbyname failed for \"%s\": unknown host?\n",str);
- return NULL;
- }
-
- if (hp->h_addr == NULL) {
- rprintf(FERROR, "gethostbyname: host address is invalid for host \"%s\"\n",str);
- return NULL;
- }
-
- if (hp->h_length > sizeof ret) {
- rprintf(FERROR, "gethostbyname: host address for \"%s\" is too large\n",
- str);
- return NULL;
- }
-
- if (hp->h_addrtype != AF_INET) {
- rprintf (FERROR, "gethostname: host address for \"%s\" is not IPv4\n",
- str);
- return NULL;
- }
-
- /* This is kind of difficult. The only field in ret is
- s_addr, which is the IP address as a 32-bit int. On
- UNICOS, s_addr is in fact a *bitfield* for reasons best
- know to Cray. This means we can't memcpy in to it. On the
- other hand, h_addr is a char*, so we can't just assign.
-
- Since there's meant to be only one field inside the in_addr
- structure we will try just copying over the top and see how
- that goes. */
- memcpy (&ret, hp->h_addr, hp->h_length);
-
- return &ret;
-}
-
-
-
-/*******************************************************************
-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. 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.
+ **/
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(&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);
+ memset(&sock2, 0, sizeof sock2);
+#ifdef 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;
+ if (listen(listener, 1) != 0)
+ goto failed;
- if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) goto failed;
+ if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0)
+ goto failed;
- if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed;
+ if ((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 *)&sock, &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
- ******************************************************************/
+
+/**
+ * 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)
{
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)
- fprintf (stderr,
- RSYNC_NAME ": execute socket program \"%s\"\n",
- prog);
- exit (system (prog));
+ exit(system(prog));
}
- close (fd[1]);
+ close(fd[1]);
return fd[0];
}
-
-
-
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff