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/*-------------------------------------------------------------------------
*
* main.c
* Stub main() routine for the postgres executable.
*
* This does some essential startup tasks for any incarnation of postgres
* (postmaster, standalone backend, or standalone bootstrap mode) and then
* dispatches to the proper FooMain() routine for the incarnation.
*
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/main/main.c,v 1.43 2001/04/21 18:29:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <pwd.h>
#include <unistd.h>
#ifdef USE_LOCALE
#include <locale.h>
#endif
#if defined(__alpha) && defined(__osf__)
#include <sys/sysinfo.h>
#include "machine/hal_sysinfo.h"
#define ASSEMBLER
#include <sys/proc.h>
#undef ASSEMBLER
#endif
#if defined(__NetBSD__)
#include <sys/param.h>
#endif
#include "miscadmin.h"
#include "bootstrap/bootstrap.h"
#include "tcop/tcopprot.h"
#define NOROOTEXEC "\
\n\"root\" execution of the PostgreSQL server is not permitted.\n\n\
The server must be started under an unprivileged userid to prevent\n\
a possible system security compromise. See the INSTALL file for\n\
more information on how to properly start the server.\n\n"
int
main(int argc, char *argv[])
{
int len;
struct passwd *pw;
char *pw_name_persist;
/*
* Place platform-specific startup hacks here. This is the right
* place to put code that must be executed early in launch of either a
* postmaster, a standalone backend, or a standalone bootstrap run.
* Note that this code will NOT be executed when a backend or
* sub-bootstrap run is forked by the postmaster.
*
* XXX The need for code here is proof that the platform in question is
* too brain-dead to provide a standard C execution environment
* without help. Avoid adding more here, if you can.
*/
#if defined(__alpha)
#ifdef NOFIXADE
int buffer[] = {SSIN_UACPROC, UAC_SIGBUS};
#endif /* NOFIXADE */
#ifdef NOPRINTADE
int buffer[] = {SSIN_UACPROC, UAC_NOPRINT};
#endif /* NOPRINTADE */
#endif /* __alpha */
#if defined(NOFIXADE) || defined(NOPRINTADE)
#if defined(ultrix4)
syscall(SYS_sysmips, MIPS_FIXADE, 0, NULL, NULL, NULL);
#endif
#if defined(__alpha)
if (setsysinfo(SSI_NVPAIRS, buffer, 1, (caddr_t) NULL,
(unsigned long) NULL) < 0)
fprintf(stderr, "setsysinfo failed: %d\n", errno);
#endif
#endif /* NOFIXADE || NOPRINTADE */
#ifdef __BEOS__
/* BeOS-specific actions on startup */
beos_startup(argc, argv);
#endif
/*
* Not-quite-so-platform-specific startup environment checks. Still
* best to minimize these.
*/
/*
* Skip permission checks if we're just trying to do --help or --version;
* otherwise root will get unhelpful failure messages from initdb.
*/
if (!(argc > 1
&& (strcmp(argv[1], "--help") == 0 ||
strcmp(argv[1], "-?") == 0 ||
strcmp(argv[1], "--version") == 0 ||
strcmp(argv[1], "-V") == 0)))
{
/*
* Make sure we are not running as root.
*
* BeOS currently runs everything as root :-(, so this check must be
* temporarily disabled there...
*/
#ifndef __BEOS__
if (geteuid() == 0)
{
fprintf(stderr, "%s", NOROOTEXEC);
exit(1);
}
#endif /* __BEOS__ */
/*
* Also make sure that real and effective uids are the same.
* Executing Postgres as a setuid program from a root shell is a
* security hole, since on many platforms a nefarious subroutine could
* setuid back to root if real uid is root. (Since nobody actually
* uses Postgres as a setuid program, trying to actively fix this
* situation seems more trouble than it's worth; we'll just expend the
* effort to check for it.)
*/
if (getuid() != geteuid())
{
fprintf(stderr, "%s: real and effective userids must match\n",
argv[0]);
exit(1);
}
}
/*
* Set up locale information from environment, in only the categories
* needed by Postgres; leave other categories set to default "C".
* (Note that CTYPE and COLLATE will be overridden later from
* pg_control if we are in an already-initialized database. We set
* them here so that they will be available to fill pg_control during
* initdb.)
*/
#ifdef USE_LOCALE
setlocale(LC_CTYPE, "");
setlocale(LC_COLLATE, "");
setlocale(LC_MONETARY, "");
#endif
/*
* Now dispatch to one of PostmasterMain, PostgresMain, or
* BootstrapMain depending on the program name (and possibly first
* argument) we were called with. The lack of consistency here is
* historical.
*/
len = strlen(argv[0]);
if (len >= 10 && strcmp(argv[0] + len - 10, "postmaster") == 0)
{
/* Called as "postmaster" */
exit(PostmasterMain(argc, argv));
}
/*
* If the first argument is "-boot", then invoke bootstrap mode. Note
* we remove "-boot" from the arguments passed on to BootstrapMain.
*/
if (argc > 1 && strcmp(argv[1], "-boot") == 0)
exit(BootstrapMain(argc - 1, argv + 1));
/*
* Otherwise we're a standalone backend. Invoke PostgresMain,
* specifying current userid as the "authenticated" Postgres user
* name.
*/
pw = getpwuid(geteuid());
if (pw == NULL)
{
fprintf(stderr, "%s: invalid current euid %d\n",
argv[0], (int) geteuid());
exit(1);
}
/* Allocate new memory because later getpwuid() calls can overwrite it */
pw_name_persist = strdup(pw->pw_name);
exit(PostgresMain(argc, argv, argc, argv, pw_name_persist));
}
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