/* -*- 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()
#include "rsync.h"
-/* 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;
+
+ 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)) {
+ 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) {
rprintf(FERROR, "failed to write to proxy: %s\n",
strerror(errno));
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));
buffer);
return -1;
}
- for (cp = &buffer[5]; isdigit(*cp) || (*cp == '.'); cp++)
- ;
+ for (cp = &buffer[5]; isdigit(*(uchar*)cp) || *cp == '.'; cp++) {}
while (*cp == ' ')
cp++;
if (*cp != '2') {
}
/* 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));
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,
+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;
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');
+ 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);
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) {
*
* @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)
+int open_socket_out_wrapped(char *host, int port, const char *bind_address,
+ int af_hint)
{
char *prog;
- if ((prog = getenv ("RSYNC_CONNECT_PROG")) != NULL)
- return sock_exec (prog);
- else
- return open_socket_out (host, port, bind_address,
- af_hint);
+ if ((prog = getenv("RSYNC_CONNECT_PROG")) != NULL)
+ return sock_exec(prog);
+ return open_socket_out(host, port, bind_address, af_hint);
}
*
* 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.
- *
+ * 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.
- *
+ * 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)
+static int *open_socket_in(int type, int port, const char *bind_address,
+ int af_hint)
{
int one=1;
- int s;
+ int s, *sp, *socks, maxs;
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++) {}
+ socks = new_array(int, maxs + 1);
+ if (!socks) {
+ rprintf(FERROR,
+ RSYNC_NAME "couldn't allocate memory for sockets");
+ return NULL;
}
/* We may not be able to create the socket, if for example the
* machine knows about IPv6 in the C library, but not in the
* kernel. */
+ sp = socks + 1; /* Leave room for count at start of array. */
for (resp = all_ai; resp; resp = resp->ai_next) {
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) {
+ setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
+ (char *)&one, sizeof one);
+ }
+#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;
+ *sp++ = s;
}
+ *socks = sp - socks - 1; /* Save count. */
- 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 (*socks == 0) {
+ rprintf(FERROR,
+ RSYNC_NAME ": open inbound socket on port %d failed: "
+ "%s\n", port, strerror(errno));
+ 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;
+}
+
+
+static RETSIGTYPE sigchld_handler(UNUSED(int val))
+{
+ signal(SIGCHLD, sigchld_handler);
+#ifdef WNOHANG
+ while (waitpid(-1, NULL, WNOHANG) > 0) {}
+#endif
}
-void start_accept_loop(int port, int (*fn)(int ))
+void start_accept_loop(int port, int (*fn)(int, int))
{
- int s;
+ fd_set deffds;
+ int *sp, maxfd, i, j;
extern char *bind_address;
extern int default_af_hint;
/* 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);
+ maxfd = -1;
+ for (i = 1; i <= *sp; i++) {
+ if (listen(sp[i], 5) == -1) {
+ for (j = 1; j <= i; j++)
+ close(sp[j]);
+ free(sp);
+ 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;
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);
+#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;
+ fd = -1;
+ for (i = 1; i <= *sp; i++) {
+ if (FD_ISSET(sp[i], &fds)) {
+ fd = accept(sp[i], (struct sockaddr *)&addr,
+ &addrlen);
+ break;
+ }
+ }
- signal(SIGCHLD, SIG_IGN);
+ if (fd < 0)
+ continue;
- /* 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
+ signal(SIGCHLD, sigchld_handler);
if ((pid = fork()) == 0) {
- close(s);
+ int ret;
+ close(sp[i]);
/* open log file in child before possibly giving
- up privileges */
+ * up privileges */
log_open();
- _exit(fn(fd));
+ ret = fn(fd, fd);
+ close_all();
+ _exit(ret);
} else if (pid < 0) {
rprintf(FERROR,
RSYNC_NAME
close(fd);
}
}
+ free(sp);
}
#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);
{
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)
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;
#ifdef 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);
}
}
-/*******************************************************************
-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_SOCKADDR_LEN
- sock2.sin_len = sizeof(sock2);
+ memset(&sock2, 0, sizeof sock2);
+#if HAVE_SOCKADDR_SIN_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);
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]);
+ 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;
}
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));
+ rprintf(FERROR, RSYNC_NAME ": socketpair_tcp failed (%s)\n",
+ strerror(errno));
return -1;
}
if (fork() == 0) {
dup(fd[1]);
if (verbose > 3) {
/* Can't use rprintf because we've forked. */
- fprintf (stderr,
- RSYNC_NAME ": execute socket program \"%s\"\n",
- prog);
+ 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];
}
-
-
-