129 lines
2.4 KiB
C
129 lines
2.4 KiB
C
#include <stdlib.h>
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#include <sys/types.h>
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#include <string.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <libnet.h>
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#define NAMELEN 28
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static int
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call(char *clone, char *dest, int *cfdp, char *dir, char *local)
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{
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int fd, cfd;
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int n;
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char name[3*NAMELEN+5];
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char data[3*NAMELEN+10];
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char *p;
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cfd = open(clone, O_RDWR);
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if(cfd < 0)
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return -1;
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/* get directory name */
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n = read(cfd, name, sizeof(name)-1);
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if(n < 0){
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close(cfd);
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return -1;
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}
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name[n] = 0;
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p = strrchr(clone, '/');
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*p = 0;
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if(dir)
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sprintf(dir, "%.*s/%.*s", 2*NAMELEN+1, clone, NAMELEN, name);
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sprintf(data, "%.*s/%.*s/data", 2*NAMELEN+1, clone, NAMELEN, name);
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/* set local side (port number, for example) if we need to */
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if(local)
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sprintf(name, "connect %.*s %.*s", 2*NAMELEN, dest, NAMELEN, local);
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else
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sprintf(name, "connect %.*s", 2*NAMELEN, dest);
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/* connect */
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if(write(cfd, name, strlen(name)) < 0){
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close(cfd);
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return -1;
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}
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/* open data connection */
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fd = open(data, O_RDWR);
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if(fd < 0){
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close(cfd);
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return -1;
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}
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if(cfdp)
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*cfdp = cfd;
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else
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close(cfd);
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return fd;
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}
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int
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dial(char *dest, char *local, char *dir, int *cfdp)
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{
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char net[128];
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char netdir[128], csname[NETPATHLEN], *slp;
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char clone[NAMELEN+12];
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char *p;
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int n;
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int fd;
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int rv;
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/* go for a standard form net!... */
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p = strchr(dest, '!');
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if(p == 0){
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sprintf(net, "net!%.*s", sizeof(net)-5, dest);
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} else {
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strncpy(net, dest, sizeof(net)-1);
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net[sizeof(net)-1] = 0;
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}
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slp = strrchr(net, '/');
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if (slp != 0) {
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*slp++ = '\0';
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strcpy(netdir, net);
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memmove(net, slp, strlen(slp)+1);
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} else
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strcpy(netdir, "/net");
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/* call the connection server */
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sprintf(csname, "%s/cs", netdir);
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fd = open(csname, O_RDWR);
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if(fd < 0){
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/* no connection server, don't translate */
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p = strchr(net, '!');
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*p++ = 0;
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sprintf(clone, "%s/%s/clone", netdir, net);
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return call(clone, p, cfdp, dir, local);
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}
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/*
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* send dest to connection to translate
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*/
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if(write(fd, net, strlen(net)) < 0){
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close(fd);
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return -1;
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}
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/*
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* loop through each address from the connection server till
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* we get one that works.
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*/
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rv = -1;
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lseek(fd, 0, 0);
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while((n = read(fd, net, sizeof(net) - 1)) > 0){
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net[n] = 0;
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p = strchr(net, ' ');
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if(p == 0)
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continue;
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*p++ = 0;
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rv = call(net, p, cfdp, dir, local);
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if(rv >= 0)
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break;
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}
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close(fd);
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return rv;
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}
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