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/*
* PgBouncer - Lightweight connection pooler for PostgreSQL.
*
* Copyright (c) 2007-2009 Marko Kreen, Skype Technologies OÜ
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Compat functions for OSes where libc does not provide them.
*/
#include "bouncer.h"
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_UCRED_H
#include <ucred.h>
#endif
#ifdef HAVE_SYS_UCRED_H
#include <sys/ucred.h>
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
/*
* Minimal spec-conforming implementations of strlcpy(), strlcat().
*/
#ifndef HAVE_STRLCPY
size_t strlcpy(char *dst, const char *src, size_t n)
{
size_t len = strlen(src);
if (len < n) {
memcpy(dst, src, len + 1);
} else if (n > 0) {
memcpy(dst, src, n - 1);
dst[n - 1] = 0;
}
return len;
}
#endif
#ifndef HAVE_STRLCAT
size_t strlcat(char *dst, const char *src, size_t n)
{
size_t pos = 0;
while (pos < n && dst[pos])
pos++;
return pos + strlcpy(dst + pos, src, n - pos);
}
#endif
/*
* Get other side's uid for UNIX socket.
*
* Standardise on getpeereid() from BSDs.
*/
#ifndef HAVE_GETPEEREID
int getpeereid(int fd, uid_t *uid_p, gid_t *gid_p)
{
#ifdef SO_PEERCRED
struct ucred cred;
socklen_t len = sizeof(cred);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cred, &len) >= 0) {
*uid_p = cred.uid;
*gid_p = cred.gid;
return 0;
}
#else /* !SO_PEERCRED */
#ifdef HAVE_GETPEERUCRED
ucred_t *cred = NULL;
if (getpeerucred(fd, &cred) >= 0) {
*uid_p = ucred_geteuid(cred);
*gid_p = ucred_getegid(cred);
ucred_free(cred);
if (*uid_p >= 0 && *gid_p >= 0)
return 0;
}
#endif /* HAVE_GETPEERUCRED */
#endif /* !SO_PEERCRED */
return -1;
}
#endif /* !HAVE_GETPEEREID */
#ifndef HAVE_BASENAME
const char *basename(const char *path)
{
const char *p;
if (path == NULL || path[0] == 0)
return ".";
if ((p = strrchr(path, '/')) != NULL)
return p[1] ? p + 1 : p;
return path;
}
#endif
void change_user(const char *user)
{
const struct passwd *pw;
gid_t gset[1];
/* check for a valid username */
pw = getpwnam(user);
if (pw == NULL)
fatal("could not find user '%s' to switch to", user);
gset[0] = pw->pw_gid;
if (getuid() == 0) {
if (setgroups(1, gset) < 0)
fatal_perror("failed to reset groups");
}
if (setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0)
fatal_perror("failed to assume identity of user '%s'", user);
if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
fatal("setuid() failed to work");
}
#ifndef HAVE_INET_NTOP
const char *inet_ntop(int af, const void *src, char *dst, socklen_t cnt)
{
const unsigned char *p = src;
if (af != AF_INET)
return NULL;
snprintf(dst, cnt, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
return dst;
}
#endif
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