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87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
#include "cache.h"
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#include <sys/wait.h>
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/*
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* First, make it shell-safe. We do this by just disallowing any
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* special characters. Somebody who cares can do escaping and let
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* through the rest. But since we're doing to feed this to ssh as
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* a command line, we're going to be pretty damn anal for now.
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*/
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static char *shell_safe(char *url)
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{
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char *n = url;
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unsigned char c;
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static const char flags[256] = {
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['0'...'9'] = 1,
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['a'...'z'] = 1,
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['A'...'Z'] = 1,
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['.'] = 1, ['/'] = 1,
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['-'] = 1, ['+'] = 1,
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[':'] = 1
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};
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while ((c = *n++) != 0) {
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if (flags[c] != 1)
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die("I don't like '%c'. Sue me.", c);
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}
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return url;
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}
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/*
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* Yeah, yeah, fixme. Need to pass in the heads etc.
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*/
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int git_connect(int fd[2], char *url, const char *prog)
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{
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char command[1024];
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const char *host, *path;
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char *colon;
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int pipefd[2][2];
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pid_t pid;
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url = shell_safe(url);
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host = NULL;
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path = url;
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colon = strchr(url, ':');
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if (colon) {
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*colon = 0;
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host = url;
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path = colon+1;
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}
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snprintf(command, sizeof(command), "%s %s", prog, path);
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if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
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die("unable to create pipe pair for communication");
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pid = fork();
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if (!pid) {
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dup2(pipefd[1][0], 0);
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dup2(pipefd[0][1], 1);
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close(pipefd[0][0]);
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close(pipefd[0][1]);
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close(pipefd[1][0]);
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close(pipefd[1][1]);
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if (host)
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execlp("ssh", "ssh", host, command, NULL);
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else
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execlp("sh", "sh", "-c", command, NULL);
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die("exec failed");
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}
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fd[0] = pipefd[0][0];
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fd[1] = pipefd[1][1];
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close(pipefd[0][1]);
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close(pipefd[1][0]);
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return pid;
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}
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int finish_connect(pid_t pid)
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{
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int ret;
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for (;;) {
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ret = waitpid(pid, NULL, 0);
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if (!ret)
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break;
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if (errno != EINTR)
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break;
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}
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return ret;
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}
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