1/* Based on setproctitle.c from openssh-5.6p1 */
2/* Based on conf.c from UCB sendmail 8.8.8 */
3
4/*
5 * Copyright 2003 Damien Miller
6 * Copyright (c) 1983, 1995-1997 Eric P. Allman
7 * Copyright (c) 1988, 1993
8 *	The Regents of the University of California.  All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include "ruby.h"
36#include "ruby/util.h"
37#define compat_init_setproctitle ruby_init_setproctitle
38
39#ifndef HAVE_SETPROCTITLE
40
41#include <stdarg.h>
42#include <stdlib.h>
43#ifdef HAVE_UNISTD_H
44#include <unistd.h>
45#endif
46#ifdef HAVE_SYS_PSTAT_H
47#include <sys/pstat.h>
48#endif
49#include <string.h>
50
51#if defined(__APPLE__)
52# ifdef HAVE_CRT_EXTERNS_H
53#  include <crt_externs.h>
54#  undef environ
55#  define environ (*_NSGetEnviron())
56# else
57#  include "crt_externs.h"
58# endif
59#endif
60
61#define SPT_NONE	0	/* don't use it at all */
62#define SPT_PSTAT	1	/* use pstat(PSTAT_SETCMD, ...) */
63#define SPT_REUSEARGV	2	/* cover argv with title information */
64
65#ifndef SPT_TYPE
66# define SPT_TYPE	SPT_NONE
67#endif
68
69#ifndef SPT_PADCHAR
70# define SPT_PADCHAR	'\0'
71#endif
72
73#if SPT_TYPE == SPT_REUSEARGV
74static char *argv_start = NULL;
75static size_t argv_env_len = 0;
76static size_t argv_len = 0;
77#endif
78
79#endif /* HAVE_SETPROCTITLE */
80
81void
82compat_init_setproctitle(int argc, char *argv[])
83{
84#if defined(SPT_TYPE) && SPT_TYPE == SPT_REUSEARGV
85	extern char **environ;
86	char *lastargv = NULL;
87	char *lastenvp = NULL;
88	char **envp = environ;
89	int i;
90
91	/*
92	 * NB: This assumes that argv has already been copied out of the
93	 * way. This is true for sshd, but may not be true for other
94	 * programs. Beware.
95	 */
96
97	if (argc == 0 || argv[0] == NULL)
98		return;
99
100	/* Fail if we can't allocate room for the new environment */
101	for (i = 0; envp[i] != NULL; i++)
102		;
103	if ((environ = calloc(i + 1, sizeof(*environ))) == NULL) {
104		environ = envp;	/* put it back */
105		return;
106	}
107
108	/*
109	 * Find the last argv string or environment variable within
110	 * our process memory area.
111	 */
112	for (i = 0; i < argc; i++) {
113		if (lastargv == NULL || lastargv + 1 == argv[i])
114			lastargv = argv[i] + strlen(argv[i]);
115	}
116	lastenvp = lastargv;
117	for (i = 0; envp[i] != NULL; i++) {
118		if (lastenvp + 1 == envp[i])
119			lastenvp = envp[i] + strlen(envp[i]);
120	}
121
122	argv[1] = NULL;
123	argv_start = argv[0];
124	argv_len = lastargv - argv[0];
125	argv_env_len = lastenvp - argv[0];
126
127	for (i = 0; envp[i] != NULL; i++)
128		environ[i] = ruby_strdup(envp[i]);
129	environ[i] = NULL;
130#endif /* SPT_REUSEARGV */
131}
132
133#ifndef HAVE_SETPROCTITLE
134void
135setproctitle(const char *fmt, ...)
136{
137#if SPT_TYPE != SPT_NONE
138	va_list ap;
139	char ptitle[1024];
140	size_t len;
141	size_t argvlen;
142#if SPT_TYPE == SPT_PSTAT
143	union pstun pst;
144#endif
145
146#if SPT_TYPE == SPT_REUSEARGV
147	if (argv_env_len <= 0)
148		return;
149#endif
150
151	va_start(ap, fmt);
152	if (fmt != NULL) {
153		vsnprintf(ptitle, sizeof(ptitle) , fmt, ap);
154	}
155	va_end(ap);
156
157#if SPT_TYPE == SPT_PSTAT
158	pst.pst_command = ptitle;
159	pstat(PSTAT_SETCMD, pst, strlen(ptitle), 0, 0);
160#elif SPT_TYPE == SPT_REUSEARGV
161	len = strlcpy(argv_start, ptitle, argv_env_len);
162	argvlen = len > argv_len ? argv_env_len : argv_len;
163	for(; len < argvlen; len++)
164		argv_start[len] = SPT_PADCHAR;
165#endif
166
167#endif /* SPT_NONE */
168}
169
170#endif /* HAVE_SETPROCTITLE */
171