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