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#define _BSD_EXTENSION
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#define _NET_EXTENSION
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#define _POSIX_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <sys/time.h>
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#define DIALTIMEOUT 30
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/* This is a dummy routine for non Plan9 systems.
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* No attempt has been made to be clever, it's just
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* supposed to work in this program.
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*/
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int dial_debug = 0;
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int
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dial(char *dest, char *local, char *dir, int *cfdp) {
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int sockconn, lport;
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struct hostent *hp; /* Pointer to host info */
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struct sockaddr_in sin; /* Socket address, Internet style */
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struct servent *sp = 0;
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char *tdest, *netname, *hostname, *servname;
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int sock_type;
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#ifndef plan9
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#define USED(x) if(x); else
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int sockoption, sockoptsize;
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#endif
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USED(dir);
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USED(cfdp);
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if ((tdest = malloc(strlen(dest)+1)) == NULL) {
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if (dial_debug) fprintf(stderr, "dial: could not allocate memory\n");
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return(-1);
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}
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strcpy(tdest, dest);
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if ((netname = strtok(tdest, "!")) == NULL) {
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fprintf(stderr, "dial: no network name\n");
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return(-1);
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}
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if (strcmp(netname, "tcp") == 0) {
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sock_type = SOCK_STREAM;
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} else if (strcmp(netname, "udp") == 0) {
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sock_type = SOCK_DGRAM;
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} else {
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fprintf(stderr, "dial: network protocol name `%s' is invalid; must be `tcp' or `udp'\n", netname);
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return(-1);
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}
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if ((hostname = strtok(0, "!")) == NULL) {
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fprintf(stderr, "dial: no host name or number\n");
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return(-1);
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}
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if ((servname = strtok(0, "!")) == NULL) {
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fprintf(stderr, "dial: no service name or number\n");
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return(-1);
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}
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hp = gethostbyname(hostname);
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if (hp == (struct hostent *)NULL) {
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if (dial_debug) fprintf(stderr, "host `%s' unknown by local host\n", hostname);
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return(-1);
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}
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if (!isdigit(servname[0]))
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sp = getservbyname(servname, netname);
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sin.sin_addr.s_addr = *(unsigned long*)hp->h_addr;
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sin.sin_port = htons((sp==0)?atoi(servname):sp->s_port);
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sin.sin_family = AF_INET;
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if (local == NULL) {
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if ((sockconn = socket(AF_INET, sock_type, 0)) < 0) {
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if (dial_debug) perror("dial:socket():");
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return(-1);
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}
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if (dial_debug) fprintf(stderr, "socket FD=%d\n", sockconn);
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} else {
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lport = atoi(local);
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if ((lport < 512) || (lport >= 1024)) {
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fprintf(stderr, "dial:invalid local port %d\n", lport);
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return(-1);
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}
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if ((sockconn = rresvport(&lport)) < 0) {
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if (dial_debug) perror("dial:rresvport():");
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return(-1);
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}
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}
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if (dial_debug) {
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fprintf(stderr, "sin size=%d\n", sizeof(sin));
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}
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alarm(DIALTIMEOUT);
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if ((connect(sockconn, (struct sockaddr *) &sin, sizeof(sin)) < 0)) {
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if (dial_debug) perror("dial:connect():");
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return(-1);
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}
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alarm(0);
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#ifndef plan9
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sockoptsize = sizeof(sockoption);
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if (getsockopt(sockconn, SOL_SOCKET, SO_KEEPALIVE, &sockoption, &sockoptsize) < 0) {
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if (dial_debug) perror("dial:getsockopt():");
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return(-1);
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}
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if (sockoptsize == sizeof(sockoption) && !sockoption) {
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if (setsockopt(sockconn, SOL_SOCKET, SO_KEEPALIVE, &sockoption, sockoptsize) < 0) {
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if (dial_debug) perror("dial:getsockopt():");
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return(-1);
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}
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}
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#endif
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return(sockconn);
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}
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