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/* Based on setproctitle.c from openssh-5.6p1 */
/* Based on conf.c from UCB sendmail 8.8.8 */
/*
* Copyright 2003 Damien Miller
* Copyright (c) 1983, 1995-1997 Eric P. Allman
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "ruby.h"
#include "ruby/util.h"
#define compat_init_setproctitle ruby_init_setproctitle
RUBY_FUNC_EXPORTED void ruby_init_setproctitle(int argc, char *argv[]);
#ifndef HAVE_SETPROCTITLE
#include <stdarg.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_PSTAT_H
#include <sys/pstat.h>
#endif
#include <string.h>
#if defined(__APPLE__)
# ifdef HAVE_CRT_EXTERNS_H
# include <crt_externs.h>
# undef environ
# define environ (*_NSGetEnviron())
# else
# include "crt_externs.h"
# endif
#endif
#define SPT_NONE 0 /* don't use it at all */
#define SPT_PSTAT 1 /* use pstat(PSTAT_SETCMD, ...) */
#define SPT_REUSEARGV 2 /* cover argv with title information */
#ifndef SPT_TYPE
# define SPT_TYPE SPT_NONE
#endif
#ifndef SPT_PADCHAR
# define SPT_PADCHAR '\0'
#endif
#if SPT_TYPE == SPT_REUSEARGV
static char *argv_start = NULL;
static size_t argv_env_len = 0;
static size_t argv_len = 0;
static char **argv1_addr = NULL;
#endif
#endif /* HAVE_SETPROCTITLE */
#if defined(SPT_TYPE) && SPT_TYPE == SPT_REUSEARGV
# define ALLOCATE_ENVIRON 1
#else
# define ALLOCATE_ENVIRON 0
#endif
#if ALLOCATE_ENVIRON
/* system_environ is the value of environ before we allocate a custom buffer.
*
* We use this to restore environ in ruby_free_proctitle.
*/
static char **system_environ = NULL;
/* orig_environ is the buffer we allocate for environ.
*
* We use this to free this buffer in ruby_free_proctitle. When we add new
* environment variables using setenv, the system may change environ to a
* different buffer and will not free the original buffer, so we need to hold
* onto this so we can free it in ruby_free_proctitle.
*
* We must not free any of the contents because it may change if the system
* updates existing environment variables.
*/
static char **orig_environ = NULL;
/* alloc_environ is a copy of orig_environ.
*
* We use this to free all the original string copies that were in orig_environ.
* Since environ could be changed to point to strings allocated by the system
* if environment variables are updated, so we need this to point to the
* original strings.
*/
static char **alloc_environ = NULL;
#endif
void
compat_init_setproctitle(int argc, char *argv[])
{
#if ALLOCATE_ENVIRON
extern char **environ;
char *lastargv = NULL;
char *lastenvp = NULL;
char **envp = environ;
int i;
/*
* NB: This assumes that argv has already been copied out of the
* way. This is true for sshd, but may not be true for other
* programs. Beware.
*/
if (argc == 0 || argv[0] == NULL)
return;
/* Fail if we can't allocate room for the new environment */
for (i = 0; envp[i] != NULL; i++);
system_environ = environ;
alloc_environ = xcalloc(i + 1, sizeof(*environ));
orig_environ = environ = xcalloc(i + 1, sizeof(*environ));
if (environ == NULL) {
environ = envp; /* put it back */
return;
}
/*
* Find the last argv string or environment variable within
* our process memory area.
*/
for (i = 0; i < argc; i++) {
if (lastargv == NULL || lastargv + 1 == argv[i])
lastargv = argv[i] + strlen(argv[i]);
}
lastenvp = lastargv;
for (i = 0; envp[i] != NULL; i++) {
if (lastenvp + 1 == envp[i])
lastenvp = envp[i] + strlen(envp[i]);
}
/* We keep argv[1], argv[2], etc. at this moment,
because the ps command of AIX refers to them. */
argv1_addr = &argv[1];
argv_start = argv[0];
argv_len = lastargv - argv[0];
argv_env_len = lastenvp - argv[0];
for (i = 0; envp[i] != NULL; i++)
alloc_environ[i] = environ[i] = ruby_strdup(envp[i]);
alloc_environ[i] = environ[i] = NULL;
#endif /* SPT_REUSEARGV */
}
void
ruby_free_proctitle(void)
{
#if ALLOCATE_ENVIRON
extern char **environ;
if (!orig_environ) return; /* environ is allocated by OS */
for (int i = 0; alloc_environ[i] != NULL; i++) {
xfree(alloc_environ[i]);
}
xfree(alloc_environ);
xfree(orig_environ);
environ = system_environ;
#endif
}
#ifndef HAVE_SETPROCTITLE
void
setproctitle(const char *fmt, ...)
{
#if SPT_TYPE != SPT_NONE
va_list ap;
char ptitle[1024];
size_t len;
size_t argvlen;
#if SPT_TYPE == SPT_PSTAT
union pstun pst;
#endif
#if SPT_TYPE == SPT_REUSEARGV
if (argv_env_len <= 0)
return;
#endif
/* fmt must be non-NULL */
va_start(ap, fmt);
vsnprintf(ptitle, sizeof(ptitle), fmt, ap);
va_end(ap);
#if SPT_TYPE == SPT_PSTAT
pst.pst_command = ptitle;
pstat(PSTAT_SETCMD, pst, strlen(ptitle), 0, 0);
#elif SPT_TYPE == SPT_REUSEARGV
len = strlcpy(argv_start, ptitle, argv_env_len);
argvlen = len > argv_len ? argv_env_len : argv_len;
for(; len < argvlen; len++)
argv_start[len] = SPT_PADCHAR;
/* argv[1], argv[2], etc. are no longer valid. */
*argv1_addr = NULL;
#endif
#endif /* SPT_NONE */
}
#endif /* HAVE_SETPROCTITLE */
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