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211 lines
4.0 KiB
C
211 lines
4.0 KiB
C
/*
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* udev_libc_wrapper - wrapping of functions missing in a specific libc
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* or not working in a statically compiled binary
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*
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* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (C) 2005 Kay Sievers <kay@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include "udev_libc_wrapper.h"
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#include "udev.h"
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#include "udev_utils.h"
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#include "logging.h"
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#ifdef __KLIBC__
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#define __OWN_USERDB_PARSER__
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#endif
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#ifdef __GLIBC__
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#define __OWN_STRLCPYCAT__
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#endif
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#ifdef USE_STATIC
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#define __OWN_USERDB_PARSER__
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#endif
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#ifdef __OWN_STRLCPYCAT__
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size_t strlcpy(char *dst, const char *src, size_t size)
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{
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size_t bytes = 0;
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char *q = dst;
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const char *p = src;
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char ch;
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while ((ch = *p++)) {
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if (bytes+1 < size)
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*q++ = ch;
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bytes++;
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}
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/* If size == 0 there is no space for a final null... */
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if (size)
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*q = '\0';
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return bytes;
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}
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size_t strlcat(char *dst, const char *src, size_t size)
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{
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size_t bytes = 0;
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char *q = dst;
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const char *p = src;
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char ch;
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while (bytes < size && *q) {
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q++;
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bytes++;
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}
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if (bytes == size)
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return (bytes + strlen(src));
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while ((ch = *p++)) {
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if (bytes+1 < size)
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*q++ = ch;
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bytes++;
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}
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*q = '\0';
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return bytes;
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}
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#endif /* __OWN_STRLCPYCAT__ */
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#ifndef __OWN_USERDB_PARSER__
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#include <sys/types.h>
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#include <pwd.h>
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#include <grp.h>
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uid_t lookup_user(const char *user)
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{
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struct passwd *pw;
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uid_t uid = 0;
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pw = getpwnam(user);
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if (pw == NULL)
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info("specified user unknown '%s'", user);
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else
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uid = pw->pw_uid;
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return uid;
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}
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gid_t lookup_group(const char *group)
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{
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struct group *gr;
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gid_t gid = 0;
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gr = getgrnam(group);
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if (gr == NULL)
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info("specified group unknown '%s'", group);
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else
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gid = gr->gr_gid;
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return gid;
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}
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#else /* __OWN_USERDB_PARSER__ */
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#define PASSWD_FILE "/etc/passwd"
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#define GROUP_FILE "/etc/group"
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/* return the id of a passwd style line, selected by the users name */
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static unsigned long get_id_by_name(const char *uname, const char *dbfile)
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{
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unsigned long id = 0;
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char line[LINE_SIZE];
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char *buf;
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char *bufline;
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size_t bufsize;
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size_t cur;
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size_t count;
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char *pos;
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char *name;
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char *idstr;
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char *tail;
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if (file_map(dbfile, &buf, &bufsize) != 0) {
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err("can't open '%s' as db file: %s", dbfile, strerror(errno));
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return 0;
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}
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dbg("search '%s' in '%s'", uname, dbfile);
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/* loop through the whole file */
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cur = 0;
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while (cur < bufsize) {
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count = buf_get_line(buf, bufsize, cur);
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bufline = &buf[cur];
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cur += count+1;
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if (count >= sizeof(line))
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continue;
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memcpy(line, bufline, count-1);
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line[count-1] = '\0';
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pos = line;
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/* get name */
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name = strsep(&pos, ":");
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if (name == NULL)
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continue;
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/* skip pass */
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if (strsep(&pos, ":") == NULL)
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continue;
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/* get id */
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idstr = strsep(&pos, ":");
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if (idstr == NULL)
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continue;
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if (strcmp(uname, name) == 0) {
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id = strtoul(idstr, &tail, 10);
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if (tail[0] != '\0') {
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id = 0;
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dbg("no id found for '%s'", name);
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} else
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dbg("id for '%s' is '%li'", name, id);
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break;
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}
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}
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file_unmap(buf, bufsize);
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return id;
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}
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uid_t lookup_user(const char *user)
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{
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unsigned long id;
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id = get_id_by_name(user, PASSWD_FILE);
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return (uid_t) id;
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}
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gid_t lookup_group(const char *group)
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{
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unsigned long id;
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id = get_id_by_name(group, GROUP_FILE);
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return (gid_t) id;
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}
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#endif /* __OWN_USERDB_PARSER__ */
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