+#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 */
+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,"failed to connect to %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 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,"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)