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/**********************************************************
* cvs_pserver.c
*
* Copyright 2004, Stefan Siegl <ssiegl@gmx.de>, Germany
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Publice License,
* version 2 or any later. The license is contained in the COPYING
* file that comes with the cvsfs4hurd distribution.
*
* talk pserver protocol
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include <malloc.h>
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <stdlib.h>
#include "cvsfs.h"
#include "cvs_pserver.h"
#include "tcpip.h"
#include "cvs_connect.h"
/* look for a password entry in $HOME/.cvspass file, permitting login
* with credentials from given config structure.
*/
static char *cvs_pserver_fetch_pw(cvsfs_config *config);
/* cvs_pserver_connect
*
* connect to the cvs pserver as further described in the cvsfs_config
* configuration structure
*/
error_t
cvs_pserver_connect(FILE **send, FILE **recv)
{
char buf[128]; /* we only need to read something like I LOVE YOU
* or some kind of error message (E,M)
*/
*send = *recv = tcpip_connect(config.cvs_hostname, config.cvs_port);
if(! *send)
/* tcpip connection couldn't be brought up, tcpip_connect spit out a
* logmessage itself ...
*/
return ENOENT;
if(! config.cvs_password)
config.cvs_password = cvs_pserver_fetch_pw(&config);
/* okay, now let's talk a little pserver dialect to log in ... */
fprintf(*send, "BEGIN AUTH REQUEST\n");
fprintf(*send, "%s\n%s\n%s\n",
config.cvs_root,
config.cvs_username,
config.cvs_password);
fprintf(*send, "END AUTH REQUEST\n");
/* okay, now watch out for the server's answer,
* in the hope, that it loves us
*/
if(! fgets(buf, sizeof(buf), *recv))
{
perror(PACKAGE);
fclose(*send);
fclose(*recv);
return EIO;
}
if(strncmp(buf, "I LOVE YOU", 10))
{
cvs_treat_error(*recv, buf);
fclose(*send);
fclose(*recv);
return EPERM;
}
return 0;
}
/* cvs_pserver_fetch_pw
*
* look for a password entry in $HOME/.cvspass file, permitting login
* with credentials from given config structure.
* make sure to free() the returned memory, if needed!
*/
static char *
cvs_pserver_fetch_pw(cvsfs_config *config)
{
char buf[512]; /* 512 byte should be enough for most CVSROOTs, if
* cvsfs tell's you to increase this value, please do so.
*/
char *cvspass_path;
FILE *cvspass;
char *cvsroot;
int cvsroot_len;
const char null_pw[] = "A"; /* empty password, returned if we fail */
if(! config->homedir)
config->homedir = getenv("HOME");
if(! config->homedir)
{
/* hmm, HOME environment variable not set, try scaning /etc/passwd
* for the homedir path ...
*/
uid_t uid = getuid();
struct passwd *pwent;
for(pwent = getpwent(); pwent; getpwent())
if(pwent->pw_uid == uid)
{
config->homedir = strdup(pwent->pw_dir);
break;
}
endpwent();
}
if(! config->homedir)
{
fprintf(stderr, PACKAGE ": cannot figure out what your homedir is. "
"trying empty password.\n");
return strdup(null_pw);
}
if(! (cvspass_path = malloc(strlen(config->homedir) + 10)))
{
perror(PACKAGE);
return strdup(null_pw); /* I pray for it to have a long lasting life! */
}
sprintf(cvspass_path, "%s/.cvspass", config->homedir);
if(! (cvspass = fopen(cvspass_path, "r")))
{
perror(PACKAGE ": cannot open .cvspass file for reading");
free(cvspass_path);
fprintf(stderr, PACKAGE ": trying to log in without password.\n");
return strdup(null_pw);
}
free(cvspass_path);
/* predict length of cvsroot string */
cvsroot_len = 20 + strlen(config->cvs_username) +
strlen(config->cvs_hostname) + strlen(config->cvs_root);
if(! (cvsroot = malloc(cvsroot_len)))
{
fclose(cvspass);
perror(PACKAGE);
return strdup(null_pw); /* I pray for it to have a long lasting life! */
}
cvsroot_len = snprintf(cvsroot, cvsroot_len, ":pserver:%s@%s:%d%s",
config->cvs_username, config->cvs_hostname,
config->cvs_port, config->cvs_root);
while(fgets(buf, sizeof(buf), cvspass))
{
char *ptr = buf + strlen(buf);
ptr --;
if(*ptr != 10)
{
fprintf(stderr, PACKAGE "cvs_pserver_fetch_pw's parse buffer is "
"too small, stop for the moment.\n");
exit(10);
}
/* chop the linefeed off the end */
*ptr = 0;
if(buf[0] != '/' || buf[1] != '1' || buf[2] != ' ')
continue; /* syntax error, well, ignore silently ... */
ptr = buf + 3;
if(strncmp(ptr, cvsroot, cvsroot_len))
continue; /* didn't match, try next one ... */
ptr += cvsroot_len;
if(*(ptr ++) != ' ')
continue; /* missing separator, cvsroot of .cvspass differs ... */
/* okay, ptr points to where the password begins ... */
fclose(cvspass);
free(cvsroot);
return strdup(ptr);
}
/* hmm, eof reached, but no password found! */
fprintf(stderr, PACKAGE ": cannot find password for CVSROOT '%s' in "
"your .cvspass file, trying no password at all\n", cvsroot);
fclose(cvspass);
free(cvsroot);
return strdup(null_pw);
}
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