93 lines
1.6 KiB
C
93 lines
1.6 KiB
C
#include <u.h>
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#include <libc.h>
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int ppid;
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/*
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* predefined
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*/
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void pass(int from, int to);
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/*
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* Connect to given datakit port
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*/
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main(int argc, char *argv[])
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{
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int fd0, fd1;
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int cpid;
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char c;
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char *cp, *devdir, *buf;
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if (argc != 4) {
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fprint(2, "usage: %s destination network service\n", argv[0]);
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exits("incorrect number of arguments");
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}
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if(!(cp = malloc((long)(strlen(argv[1])+strlen(argv[2])+strlen(argv[3])+8)))) {
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perror("malloc");
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exits("malloc failed");
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}
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sprint(cp, "%s!%s!%s", argv[2], argv[1], argv[3]);
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if (dial(cp, &devdir, 0) < 0) {
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fprint(2, "dialing %s\n", cp);
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perror("dial");
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exits("can't dial");
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}
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/*
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* Initialize the input fd, and copy bytes.
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*/
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if(!(buf = malloc((long)(strlen(devdir)+6)))) {
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perror("malloc");
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exits("malloc failed");
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}
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sprint(buf, "%s/data", devdir);
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fd0=open(buf, OREAD);
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fd1=open(buf, OWRITE);
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if(fd0<0 || fd1<0) {
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print("can't open", buf);
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exits("can't open port");
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}
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ppid = getpid();
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switch(cpid = fork()){
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case -1:
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perror("fork failed");
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exits("fork failed");
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case 0:
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close(0);
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close(fd1);
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pass(fd0, 1); /* from remote */
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hangup(fd0);
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close(1);
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close(fd0);
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exits("");
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default:
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close(1);
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close(fd0);
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pass(0, fd1); /* to remote */
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hangup(fd1);
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close(0);
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close(fd1);
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exits("");
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}
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}
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void
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pass(int from, int to)
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{
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char buf[1024];
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int ppid, cpid;
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int n, tot = 0;
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while ((n=read(from, buf, sizeof(buf))) > 0) {
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if (n==1 && tot==0 && *buf=='\0')
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break;
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tot += n;
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if (write(to, buf, n)!=n) {
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perror("pass write error");
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exits("pass write error");
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}
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}
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}
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