/* -*- 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"
-static const char default_name[] = "UNKNOWN";
-
-/* Establish a proxy connection on an open socket to a web roxy by
- * using the CONNECT method. */
+/**
+ * Establish a proxy connection on an open socket to a web proxy by
+ * using the HTTP CONNECT method.
+ **/
static int establish_proxy_connection(int fd, char *host, int port)
{
char buffer[1024];
char *cp;
snprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port);
- if (write(fd, buffer, strlen(buffer)) != strlen(buffer)) {
+ if (write(fd, buffer, strlen(buffer)) != (int)strlen(buffer)) {
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;
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;
}
* connetcion via a web proxy at the given address. The format
* is hostname:port */
h = getenv("RSYNC_PROXY");
- proxied = (h != NULL) && (*h != '\0');
+ proxied = h != NULL && *h != '\0';
if (proxied) {
strlcpy(buffer, h, sizeof(buffer));
*cp++ = '\0';
strcpy(portbuf, cp);
h = buffer;
+ if (verbose >= 2) {
+ rprintf(FINFO, "connection via http proxy %s port %s\n",
+ h, portbuf);
+ }
} else {
snprintf(portbuf, sizeof(portbuf), "%d", port);
h = host;
*
* @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.
**/
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) {
+
+ /* 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;
}
rprintf(FERROR, RSYNC_NAME ": open inbound socket on port %d failed: "
"%s\n",
- port,
+ port,
strerror(errno));
freeaddrinfo(all_ai);
- return -1;
+ return -1;
}
* 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);
+ 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;
extern char *bind_address;
for each incoming connection */
while (1) {
fd_set fds;
+ pid_t pid;
int fd;
struct sockaddr_storage addr;
socklen_t addrlen = sizeof addr;
FD_ZERO(&fds);
FD_SET(s, &fds);
- if (select(s+1, &fds, NULL, NULL, NULL) != 1) {
+ if (select(s+1, &fds, NULL, NULL, NULL) != 1)
continue;
- }
- if(!FD_ISSET(s, &fds)) continue;
+ if (!FD_ISSET(s, &fds))
+ continue;
fd = accept(s,(struct sockaddr *)&addr,&addrlen);
- if (fd == -1) continue;
+ if (fd == -1)
+ continue;
- signal(SIGCHLD, SIG_IGN);
+ signal(SIGCHLD, sigchld_handler);
- /* 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 (fork()==0) {
+ if ((pid = fork()) == 0) {
+ int ret;
close(s);
/* open log file in child before possibly giving
up privileges */
log_open();
- _exit(fn(fd));
+ ret = fn(fd, fd);
+ close_all();
+ _exit(ret);
+ } else if (pid < 0) {
+ rprintf(FERROR,
+ RSYNC_NAME
+ ": could not create child server process: %s\n",
+ strerror(errno));
+ 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);
ret = setsockopt(fd,socket_options[i].level,
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);
ret = setsockopt(fd,socket_options[i].level,
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);
+ 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;
- socklen_t 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.
+ * This is like socketpair but uses tcp. It is used by the Samba
+ * regression test code.
*
- * The name is statically cached so that repeated lookups are quick,
- * so there is a limit of one lookup per customer.
- *
- * If anything goes wrong, including the name->addr->name check, then
- * we just use "UNKNOWN", so you can use that value in hosts allow
- * lines.
+ * 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.
**/
-char *client_name(int fd)
-{
- struct sockaddr_storage ss;
- socklen_t ss_len = sizeof ss;
- static char name_buf[100];
- static char port_buf[100];
- static int initialised;
-
- if (initialised) return name_buf;
-
- strcpy(name_buf, default_name);
- initialised = 1;
-
- if (getpeername(fd, (struct sockaddr *)&ss, &ss_len)) {
- /* FIXME: Can we really not continue? */
- rprintf(FERROR, RSYNC_NAME ": getpeername on fd%d failed: %s\n",
- fd, strerror(errno));
- exit_cleanup(RERR_SOCKETIO);
- }
-
- if (!lookup_name(fd, &ss, ss_len, name_buf, sizeof name_buf, port_buf, sizeof port_buf))
- check_name(fd, &ss, ss_len, name_buf, port_buf);
-
- return name_buf;
-}
-
-
-/**
- * Look up a name from @p ss into @p name_buf.
- **/
-int lookup_name(int fd, const struct sockaddr_storage *ss,
- socklen_t ss_len,
- char *name_buf, size_t name_buf_len,
- char *port_buf, size_t port_buf_len)
-{
- int name_err;
-
-#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;
- ss_len = sizeof(struct sockaddr_in);
-#ifdef HAVE_SOCKADDR_LEN
- sin->sin_len = ss_len;
-#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 */
- name_err = getnameinfo((struct sockaddr *) ss, ss_len,
- name_buf, name_buf_len,
- port_buf, port_buf_len,
- NI_NAMEREQD | NI_NUMERICSERV);
- if (name_err != 0) {
- strcpy(name_buf, default_name);
- rprintf(FERROR, RSYNC_NAME ": name lookup failed for %s: %s\n",
- client_addr(fd),
- gai_strerror(name_err));
- return name_err;
- }
-
- return 0;
-}
-
-
-
-/* Do a forward lookup on name_buf and make sure it corresponds to ss
- * -- otherwise we may be being spoofed. If we suspect we are, then
- * we don't abort the connection but just emit a warning. */
-int check_name(int fd,
- const struct sockaddr_storage *ss,
- socklen_t ss_len,
- char *name_buf,
- const char *port_buf)
-{
- struct addrinfo hints, *res, *res0;
- int error;
-
- 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, default_name);
- rprintf(FERROR,
- RSYNC_NAME ": forward name lookup for %s:%s failed: %s\n",
- name_buf, port_buf,
- gai_strerror(error));
- return error;
- }
-
-
- /* We expect that one of the results will be the same as ss. */
- for (res = res0; res; res = res->ai_next) {
- if (res->ai_family != get_sockaddr_family(ss))
- continue;
- if (res->ai_addrlen != ss_len)
- continue;
- if (memcmp(res->ai_addr, ss, res->ai_addrlen) == 0)
- break;
- }
-
- if (res == NULL) {
- strcpy(name_buf, default_name);
- /* We hit the end of the list without finding an
- * address that was the same as ss. */
- rprintf(FERROR, RSYNC_NAME
- ": no address record for \"%s\" corresponds to address %s: "
- "spoofed address?\n",
- name_buf,
- client_addr(fd));
- }
-
- freeaddrinfo(res0);
- return 0;
-}
-
-
-/*******************************************************************
-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 sock2;
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;
+
+ if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1)
+ goto failed;
memset(&sock2, 0, sizeof(sock2));
-#ifdef HAVE_SOCK_SIN_LEN
+#ifdef HAVE_SOCKADDR_LEN
sock2.sin_len = sizeof(sock2);
#endif
sock2.sin_family = PF_INET;
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 (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;
+ && 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];
}
-
-
-
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff