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e433b071fe
The change I made to rsh.c would leave the string unterminated under certain conditions, which unfortunately always applied! This patch fixes this. For some reason this never bit on i386 or ppc, but bit me on x86-64. Fix situation where the buffer was not properly null-terminated. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
149 lines
2.7 KiB
C
149 lines
2.7 KiB
C
#include "rsh.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 "cache.h"
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#define COMMAND_SIZE 4096
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/*
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* Write a shell-quoted version of a string into a buffer, and
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* return bytes that ought to be output excluding final null.
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*/
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static int shell_quote(char *buf, int nmax, const char *str)
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{
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char ch;
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int nq;
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int oc = 0;
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while ( (ch = *str++) ) {
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nq = 0;
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if ( strchr(" !\"#$%&\'()*;<=>?[\\]^`{|}", ch) )
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nq = 1;
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if ( nq ) {
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if ( nmax > 1 ) {
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*buf++ = '\\';
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nmax--;
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}
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oc++;
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}
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if ( nmax > 1 ) {
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*buf++ = ch;
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nmax--;
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}
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oc++;
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}
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if ( nmax )
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*buf = '\0';
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return oc;
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}
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/*
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* Append a string to a string buffer, with or without quoting. Return true
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* if the buffer overflowed.
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*/
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static int add_to_string(char **ptrp, int *sizep, const char *str, int quote)
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{
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char *p = *ptrp;
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int size = *sizep;
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int oc;
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int err = 0;
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if ( quote ) {
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oc = shell_quote(p, size, str);
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} else {
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oc = strlen(str);
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memcpy(p, str, (oc >= size) ? size-1 : oc);
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}
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if ( oc >= size ) {
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err = 1;
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oc = size-1;
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}
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*ptrp += oc;
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**ptrp = '\0';
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*sizep -= oc;
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return err;
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}
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int setup_connection(int *fd_in, int *fd_out, const char *remote_prog,
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char *url, int rmt_argc, char **rmt_argv)
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{
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char *host;
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char *path;
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int sv[2];
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char command[COMMAND_SIZE];
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char *posn;
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int sizen;
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int of;
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int i;
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if (!strcmp(url, "-")) {
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*fd_in = 0;
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*fd_out = 1;
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return 0;
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}
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host = strstr(url, "//");
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if (host) {
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host += 2;
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path = strchr(host, '/');
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} else {
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host = url;
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path = strchr(host, ':');
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if (path)
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*(path++) = '\0';
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}
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if (!path) {
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return error("Bad URL: %s", url);
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}
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/* $GIT_RSH <host> "env GIR_DIR=<path> <remote_prog> <args...>" */
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sizen = COMMAND_SIZE;
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posn = command;
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of = 0;
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of |= add_to_string(&posn, &sizen, "env ", 0);
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of |= add_to_string(&posn, &sizen, GIT_DIR_ENVIRONMENT, 0);
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of |= add_to_string(&posn, &sizen, "=", 0);
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of |= add_to_string(&posn, &sizen, path, 1);
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of |= add_to_string(&posn, &sizen, " ", 0);
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of |= add_to_string(&posn, &sizen, remote_prog, 1);
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for ( i = 0 ; i < rmt_argc ; i++ ) {
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of |= add_to_string(&posn, &sizen, " ", 0);
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of |= add_to_string(&posn, &sizen, rmt_argv[i], 1);
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}
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of |= add_to_string(&posn, &sizen, " -", 0);
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if ( of )
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return error("Command line too long");
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv))
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return error("Couldn't create socket");
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if (!fork()) {
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const char *ssh, *ssh_basename;
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ssh = getenv("GIT_SSH");
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if (!ssh) ssh = "ssh";
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ssh_basename = strrchr(ssh, '/');
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if (!ssh_basename)
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ssh_basename = ssh;
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else
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ssh_basename++;
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close(sv[1]);
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dup2(sv[0], 0);
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dup2(sv[0], 1);
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execlp(ssh, ssh_basename, host, command, NULL);
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}
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close(sv[0]);
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*fd_in = sv[1];
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*fd_out = sv[1];
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return 0;
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}
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