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/* qmail-users.c - qmail users/cdb lookup routines
* Copyright (C) 2010 Bruce Guenter <bruce@untroubled.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <bglibs/sysdeps.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <bglibs/cdb.h>
#include <bglibs/cdb.h>
#include <bglibs/iobuf.h>
#include <bglibs/str.h>
#include "qmail.h"
static str users_path;
static int users_fd = -1;
static struct cdb users_cdb;
static struct stat users_stat;
int qmail_users_reinit(void)
{
struct stat s;
/* If we can see the users CDB file... */
if (stat(users_path.s, &s) != -1) {
/* If it was either not open or has changed since the last open... */
if (users_fd == -1 ||
s.st_ino != users_stat.st_ino ||
s.st_mtime != users_stat.st_mtime ||
s.st_size != users_stat.st_size) {
/* If it was previously open, close it */
if (users_fd != -1) {
close(users_fd);
cdb_free(&users_cdb);
}
/* And re-open it */
if ((users_fd = open(users_path.s, O_RDONLY)) != -1) {
fstat(users_fd, &users_stat);
cdb_init(&users_cdb, users_fd);
}
}
}
else if (users_fd != -1) {
close(users_fd);
cdb_free(&users_cdb);
users_fd = -1;
}
return 0;
}
int qmail_users_init(void)
{
if (!str_copy2s(&users_path, qmail_root, "/users/cdb"))
return -1;
return qmail_users_reinit();
}
static int lookup_userscdb(struct qmail_user* u,
str* name, char dash)
{
char* ptr;
const char* end;
const char* user;
const char* home;
int i;
if (!str_spliceb(name, 0, 0, "!", 1)
|| (name->len > 1 && !str_catc(name, dash))) {
errno = ENOMEM;
return -1;
}
if ((i = cdb_get(&users_cdb, name, name)) <= 0)
return i;
/* name now contains:
* user NUL uid NUL gid NUL home NUL dash NUL ext
*/
errno = EDOM;
ptr = name->s;
end = name->s + name->len;
user = ptr;
if ((ptr += strlen(ptr) + 1) >= end) return -1;
u->uid = strtoul(ptr, &ptr, 10);
if (*ptr++ != 0 || ptr >= end) return -1;
u->gid = strtoul(ptr, &ptr, 10);
if (*ptr++ != 0 || ptr >= end) return -1;
home = ptr;
if ((ptr += strlen(ptr) + 1) >= end) return -1;
if ((u->dash = *ptr) != 0) ++ptr;
if (*ptr++ != 0 || ptr > end) return -1;
if (!str_copys(&u->user, user)
|| !str_copys(&u->homedir, home)
|| !str_copyb(&u->ext, ptr, end-ptr)) {
errno = ENOMEM;
return -1;
}
return 1;
}
static int lookup_passwd(struct qmail_user* u, const str* namestr, char dash)
{
const struct passwd* pw;
const char* name;
if (*(name = namestr->s) == 0)
name = "alias";
if ((pw = getpwnam(name)) == 0)
return (errno == ETXTBSY) ? -1 : 0;
if (!str_copys(&u->user, pw->pw_name)
|| !str_copys(&u->homedir, pw->pw_dir)
|| !str_copys(&u->ext, "")) {
errno = ENOMEM;
return -1;
}
u->uid = pw->pw_uid;
u->gid = pw->pw_gid;
u->dash = dash;
return 1;
}
int qmail_users_lookup(struct qmail_user* u, const char* name, char dash)
{
static str lname;
if (!str_copys(&lname, name)){
errno = ENOMEM;
return -1;
}
str_lower(&lname);
if (users_fd != -1) {
switch (lookup_userscdb(u, &lname, dash)) {
case -1: return -1;
case 0: break;
default: return 1;
}
if (!str_copys(&lname, name)){
errno = ENOMEM;
return -1;
}
}
return lookup_passwd(u, &lname, dash);
}
int qmail_users_lookup_split(struct qmail_user* u, const char* name,
str* local, str* ext)
{
static str account;
int i;
/* Check if the name is a base UNIX user. */
if (!str_copys(local, name)) return -1;
if (!str_copys(ext, "")) return -1;
switch (qmail_users_lookup(u, name, 0)) {
case -1: return -1;
case 0: break;
default: return 1;
}
/* Now, look for increasingly shorter base-ext pairs */
if (!str_copy(&account, local)) return -1;
i = account.len;
while (i > 0 && (i = str_findprev(&account, '-', i-1)) != -1) {
if (!str_copyb(local, account.s, i)) return -1;
if (!str_copyb(ext, account.s+i+1, account.len-i-1)) return -1;
switch (qmail_users_lookup(u, local->s, '-')) {
case -1: return -1;
case 0: continue;
default: return 1;
}
}
switch (qmail_users_lookup(u, "", '-')) {
case -1: return -1;
case 0: return 0;
}
str_copyb(local, "", 0);
if (!str_copy(ext, &account)) return -1;
return 1;
}
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