297 lines
7.0 KiB
C
297 lines
7.0 KiB
C
/*
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Copyright (C) Andrew Tridgell 1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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socket functions used in rsync
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*/
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#include "rsync.h"
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/* open a socket to a tcp remote host with the specified port
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based on code from Warren */
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int open_socket_out(char *host, int port)
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{
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int type = SOCK_STREAM;
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struct sockaddr_in sock_out;
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int res;
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struct hostent *hp;
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res = socket(PF_INET, type, 0);
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if (res == -1) {
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return -1;
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}
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hp = gethostbyname(host);
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if (!hp) {
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rprintf(FERROR,"unknown host: %s\n", host);
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return -1;
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}
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memcpy(&sock_out.sin_addr, hp->h_addr, hp->h_length);
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sock_out.sin_port = htons(port);
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sock_out.sin_family = PF_INET;
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if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
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close(res);
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rprintf(FERROR,"failed to connect to %s - %s\n", host, strerror(errno));
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return -1;
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}
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return res;
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}
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/****************************************************************************
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open a socket of the specified type, port and address for incoming data
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****************************************************************************/
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static int open_socket_in(int type, int port)
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{
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struct hostent *hp;
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struct sockaddr_in sock;
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char host_name[200];
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int res;
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int one=1;
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/* get my host name */
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if (gethostname(host_name, sizeof(host_name)) == -1) {
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rprintf(FERROR,"gethostname failed\n");
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return -1;
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}
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/* get host info */
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if ((hp = gethostbyname(host_name)) == 0) {
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rprintf(FERROR,"gethostbyname: Unknown host %s\n",host_name);
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return -1;
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}
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bzero((char *)&sock,sizeof(sock));
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memcpy((char *)&sock.sin_addr,(char *)hp->h_addr, hp->h_length);
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sock.sin_port = htons(port);
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sock.sin_family = hp->h_addrtype;
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sock.sin_addr.s_addr = INADDR_ANY;
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res = socket(hp->h_addrtype, type, 0);
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if (res == -1) {
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rprintf(FERROR,"socket failed\n");
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return -1;
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}
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setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one));
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/* now we've got a socket - we need to bind it */
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if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) == -1) {
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rprintf(FERROR,"bind failed on port %d\n", port);
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close(res);
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return -1;
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}
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return res;
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}
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/****************************************************************************
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determine if a file descriptor is in fact a socket
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****************************************************************************/
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int is_a_socket(int fd)
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{
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int v,l;
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l = sizeof(int);
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return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
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}
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void start_accept_loop(int port, int (*fn)(int ))
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{
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int s;
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signal(SIGCLD, SIG_IGN);
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/* open an incoming socket */
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s = open_socket_in(SOCK_STREAM, port);
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if (s == -1)
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exit(1);
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/* ready to listen */
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if (listen(s, 5) == -1) {
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close(s);
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exit(1);
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}
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/* now accept incoming connections - forking a new process
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for each incoming connection */
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while (1) {
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fd_set fds;
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int fd;
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struct sockaddr addr;
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int in_addrlen = sizeof(addr);
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FD_ZERO(&fds);
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FD_SET(s, &fds);
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if (select(s+1, &fds, NULL, NULL, NULL) != 1) {
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continue;
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}
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if(!FD_ISSET(s, &fds)) continue;
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fd = accept(s,&addr,&in_addrlen);
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if (fd == -1) continue;
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if (fork()==0) {
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close(s);
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_exit(fn(fd));
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}
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close(fd);
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}
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}
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enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
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struct
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{
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char *name;
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int level;
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int option;
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int value;
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int opttype;
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} socket_options[] = {
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{"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
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{"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
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{"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
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#ifdef TCP_NODELAY
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{"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
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#endif
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#ifdef IPTOS_LOWDELAY
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{"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
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#endif
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#ifdef IPTOS_THROUGHPUT
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{"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
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#endif
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#ifdef SO_SNDBUF
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{"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
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#endif
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#ifdef SO_RCVBUF
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{"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
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#endif
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#ifdef SO_SNDLOWAT
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{"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
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#endif
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#ifdef SO_RCVLOWAT
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{"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
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#endif
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#ifdef SO_SNDTIMEO
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{"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
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#endif
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#ifdef SO_RCVTIMEO
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{"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
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#endif
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{NULL,0,0,0,0}};
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/****************************************************************************
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set user socket options
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****************************************************************************/
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void set_socket_options(int fd, char *options)
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{
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char *tok;
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options = strdup(options);
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if (!options) out_of_memory("set_socket_options");
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for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) {
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int ret=0,i;
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int value = 1;
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char *p;
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int got_value = 0;
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if ((p = strchr(tok,'='))) {
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*p = 0;
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value = atoi(p+1);
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got_value = 1;
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}
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for (i=0;socket_options[i].name;i++)
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if (strcmp(socket_options[i].name,tok)==0)
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break;
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if (!socket_options[i].name) {
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rprintf(FERROR,"Unknown socket option %s\n",tok);
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continue;
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}
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switch (socket_options[i].opttype) {
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case OPT_BOOL:
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case OPT_INT:
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ret = setsockopt(fd,socket_options[i].level,
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socket_options[i].option,(char *)&value,sizeof(int));
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break;
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case OPT_ON:
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if (got_value)
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rprintf(FERROR,"syntax error - %s does not take a value\n",tok);
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{
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int on = socket_options[i].value;
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ret = setsockopt(fd,socket_options[i].level,
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socket_options[i].option,(char *)&on,sizeof(int));
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}
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break;
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}
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if (ret != 0)
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rprintf(FERROR,"Failed to set socket option %s\n",tok);
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}
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free(options);
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}
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/****************************************************************************
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become a daemon, discarding the controlling terminal
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****************************************************************************/
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void become_daemon(void)
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{
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if (fork())
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_exit(0);
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/* detach from the terminal */
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#ifdef HAVE_SETSID
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setsid();
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#else
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#ifdef TIOCNOTTY
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{
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int i = open("/dev/tty", O_RDWR);
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if (i >= 0)
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{
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ioctl(i, (int) TIOCNOTTY, (char *)0);
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close(i);
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}
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}
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#endif /* TIOCNOTTY */
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#endif
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close(0);
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close(1);
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close(2);
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}
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