-/*
- Copyright (C) Andrew Tridgell 1998
+/* -*- 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
*/
-int open_socket_out(char *host, int port)
+#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)
+{
+ 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)) {
+ rprintf(FERROR, "failed to write to proxy: %s\n",
+ strerror(errno));
+ return -1;
+ }
+
+ 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));
+ return -1;
+ }
+ if (*cp == '\n')
+ break;
+ }
+
+ if (*cp != '\n')
+ cp++;
+ *cp-- = '\0';
+ if (*cp == '\r')
+ *cp = '\0';
+ if (strncmp(buffer, "HTTP/", 5) != 0) {
+ rprintf(FERROR, "bad response from proxy - %s\n",
+ buffer);
+ return -1;
+ }
+ for (cp = &buffer[5]; isdigit(*cp) || (*cp == '.'); cp++)
+ ;
+ while (*cp == ' ')
+ cp++;
+ if (*cp != '2') {
+ 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++) {
+ if (read(fd, cp, 1) != 1) {
+ rprintf(FERROR, "failed to read from proxy: %s\n",
+ strerror(errno));
+ return -1;
+ }
+ if (*cp == '\n')
+ break;
+ }
+ if ((cp > buffer) && (*cp == '\n'))
+ cp--;
+ if ((cp == buffer) && ((*cp == '\n') || (*cp == '\r')))
+ break;
+ }
+ return 0;
+}
+
+
+
+/* open a socket to a tcp remote host with the specified port
+ based on code from Warren
+ proxy support by Stephen Rothwell */
+static int open_socket_out (char *host,
+ int port,
+ struct in_addr *address)
+{
+ int type = SOCK_STREAM;
+ struct sockaddr_in sock_out;
+ struct sockaddr_in sock;
+ int res;
+ struct hostent *hp;
+ char *h;
+ unsigned p;
+ int proxied = 0;
+ char buffer[1024];
+ char *cp;
+
+ /* 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 */
+ h = getenv("RSYNC_PROXY");
+ proxied = (h != NULL) && (*h != '\0');
+
+ if (proxied) {
+ strlcpy(buffer, h, sizeof(buffer));
+ cp = strchr(buffer, ':');
+ if (cp == NULL) {
+ rprintf(FERROR,
+ "invalid proxy specification: should be HOST:PORT\n");
+ return -1;
+ }
+ *cp++ = '\0';
+ p = atoi(cp);
+ h = buffer;
+ } else {
+ h = host;
+ p = port;
+ }
+
+ res = socket(PF_INET, type, 0);
+ if (res == -1) {
+ return -1;
+ }
+
+ hp = gethostbyname(h);
+ if (!hp) {
+ rprintf(FERROR,"unknown host: \"%s\"\n", h);
+ close(res);
+ return -1;
+ }
+
+ memcpy(&sock_out.sin_addr, hp->h_addr, hp->h_length);
+ sock_out.sin_port = htons(p);
+ sock_out.sin_family = PF_INET;
+
+ if (address) {
+ sock.sin_addr = *address;
+ sock.sin_port = 0;
+ sock.sin_family = hp->h_addrtype;
+ bind(res, (struct sockaddr * ) &sock,sizeof(sock));
+ }
+
+ if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
+ rprintf (FERROR, RSYNC_NAME ": failed to connect to host %s: %s\n",
+ h, strerror(errno));
+ close(res);
+ return -1;
+ }
+
+ if (proxied && establish_proxy_connection(res, host, port) != 0) {
+ close(res);
+ return -1;
+ }
+
+ return res;
+}
+
+
+/**
+ * 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.
+ *
+ * We use this primarily in testing to detect TCP flow bugs, but not
+ * cause security problems by really opening remote connections.
+ *
+ * This is based on the Samba LIBSMB_PROG feature.
+ **/
+int open_socket_out_wrapped (char *host,
+ int port,
+ struct in_addr *address)
+{
+ char *prog;
+
+ if ((prog = getenv ("RSYNC_CONNECT_PROG")) != NULL)
+ return sock_exec (prog);
+ else
+ return open_socket_out (host, port, address);
+}
+
+
+
+/****************************************************************************
+open a socket of the specified type, port and address for incoming data
+****************************************************************************/
+static int open_socket_in(int type, int port, struct in_addr *address)
+{
+ struct sockaddr_in sock;
+ int res;
+ int one=1;
+
+ memset((char *)&sock,0,sizeof(sock));
+ sock.sin_port = htons(port);
+ sock.sin_family = AF_INET;
+ if (address) {
+ sock.sin_addr = *address;
+ } else {
+ sock.sin_addr.s_addr = INADDR_ANY;
+ }
+ res = socket(AF_INET, type, 0);
+ if (res == -1) {
+ rprintf(FERROR, RSYNC_NAME ": socket failed: %s\n",
+ strerror(errno));
+ return -1;
+ }
+
+ setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one));
+
+ /* now we've got a socket - we need to bind it */
+ if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) == -1) {
+ rprintf(FERROR,"bind failed on port %d: %s\n", port,
+ strerror(errno));
+ if (errno == EACCES && port < 1024) {
+ rprintf(FERROR, "Note: you must be root to bind "
+ "to low-numbered ports");
+ }
+ close(res);
+ return -1;
+ }
+
+ return res;
+}
+
+
+/*
+ * 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);
+}
+
+
+void start_accept_loop(int port, int (*fn)(int ))
{
+ int s;
+ extern struct in_addr socket_address;
+
+ /* open an incoming socket */
+ s = open_socket_in(SOCK_STREAM, port, &socket_address);
+ if (s == -1)
+ exit_cleanup(RERR_SOCKETIO);
+
+ /* ready to listen */
+ if (listen(s, 5) == -1) {
+ close(s);
+ exit_cleanup(RERR_SOCKETIO);
+ }
+
+
+ /* now accept incoming connections - forking a new process
+ for each incoming connection */
+ while (1) {
+ fd_set fds;
+ int fd;
+ struct sockaddr addr;
+ socklen_t in_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();
+
+ FD_ZERO(&fds);
+ FD_SET(s, &fds);
+
+ if (select(s+1, &fds, NULL, NULL, NULL) != 1) {
+ continue;
+ }
+
+ if(!FD_ISSET(s, &fds)) continue;
+
+ /* See note above prototypes. */
+ fd = accept(s,&addr, &in_addrlen);
+
+ if (fd == -1) continue;
+
+ signal(SIGCHLD, SIG_IGN);
+
+ /* 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) {
+ close(s);
+
+ /* open log file in child before possibly giving
+ up privileges */
+ log_open();
+
+ _exit(fn(fd));
+ }
+
+ close(fd);
+ }
+}
+
+
+enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
+
+struct
+{
+ char *name;
+ int level;
+ int option;
+ int value;
+ int opttype;
+} socket_options[] = {
+ {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
+ {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
+ {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
+#ifdef TCP_NODELAY
+ {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
+#endif
+#ifdef IPTOS_LOWDELAY
+ {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
+#endif
+#ifdef IPTOS_THROUGHPUT
+ {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
+#endif
+#ifdef SO_SNDBUF
+ {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
+#endif
+#ifdef SO_RCVBUF
+ {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
+#endif
+#ifdef SO_SNDLOWAT
+ {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
+#endif
+#ifdef SO_RCVLOWAT
+ {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
+#endif
+#ifdef SO_SNDTIMEO
+ {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
+#endif
+#ifdef SO_RCVTIMEO
+ {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
+#endif
+ {NULL,0,0,0,0}};
+
+
+
+/****************************************************************************
+set user socket options
+****************************************************************************/
+void set_socket_options(int fd, char *options)
+{
+ char *tok;
+ 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,")) {
+ int ret=0,i;
+ int value = 1;
+ char *p;
+ int got_value = 0;
+
+ if ((p = strchr(tok,'='))) {
+ *p = 0;
+ value = atoi(p+1);
+ got_value = 1;
+ }
+
+ 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);
+ continue;
+ }
+
+ switch (socket_options[i].opttype) {
+ case OPT_BOOL:
+ case OPT_INT:
+ 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);
+
+ {
+ int on = socket_options[i].value;
+ ret = setsockopt(fd,socket_options[i].level,
+ 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 sa;
+ struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
+ socklen_t length = sizeof(sa);
+ static char addr_buf[100];
+ static int initialised;
+
+ if (initialised) return addr_buf;
+
+ initialised = 1;
+
+ if (getpeername(fd, &sa, &length)) {
+ exit_cleanup(RERR_SOCKETIO);
+ }
+
+ strlcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr), sizeof(addr_buf));
+ return addr_buf;
+}
+
+
+/*******************************************************************
+ return the DNS name of the client
+ ******************************************************************/
+char *client_name(int fd)
+{
+ struct sockaddr sa;
+ struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
+ socklen_t length = sizeof(sa);
+ static char name_buf[100];
+ struct hostent *hp;
+ char **p;
+ char *def = "UNKNOWN";
+ static int initialised;
+
+ if (initialised) return name_buf;
+
+ initialised = 1;
+
+ strcpy(name_buf,def);
+
+ if (getpeername(fd, &sa, &length)) {
+ exit_cleanup(RERR_SOCKETIO);
+ }
+
+ /* Look up the remote host name. */
+ if ((hp = gethostbyaddr((char *) &sockin->sin_addr,
+ sizeof(sockin->sin_addr),
+ AF_INET))) {
+ strlcpy(name_buf,(char *)hp->h_name,sizeof(name_buf));
+ }
+
+
+ /* do a forward lookup as well to prevent spoofing */
+ hp = gethostbyname(name_buf);
+ if (!hp) {
+ strcpy (name_buf,def);
+ rprintf (FERROR, "reverse name lookup for \"%s\" failed\n",
+ name_buf);
+ } else {
+ for (p=hp->h_addr_list;*p;p++) {
+ if (memcmp(*p, &sockin->sin_addr, hp->h_length) == 0) {
+ break;
+ }
+ }
+ if (!*p) {
+ strcpy(name_buf,def);
+ rprintf(FERROR,"reverse name lookup mismatch - spoofed address?\n");
+ }
+ }
+
+ 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
+ ******************************************************************/
+static int socketpair_tcp(int fd[2])
+{
+ int listener;
+ struct sockaddr_in sock;
+ 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;
+
+ memset(&sock2, 0, sizeof(sock2));
+#ifdef HAVE_SOCK_SIN_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 (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) 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 {
+ connect_done = 1;
+ }
+
+ 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;
+ }
+
+ 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);
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)
+{
+ int fd[2];
+ if (socketpair_tcp(fd) != 0) {
+ rprintf (FERROR, RSYNC_NAME
+ ": socketpair_tcp failed (%s)\n",
+ strerror(errno));
+ return -1;
+ }
+ 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));
+ }
+ close (fd[1]);
+ return fd[0];
+}
+
+
+
Matt McCutchen's Web Site / rsync / rsync.git / blobdiff