setproctitle.c revision 181110 
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 <stdlib.h>
40#include <unistd.h>
41#ifdef HAVE_SYS_PSTAT_H
42#include <sys/pstat.h>
43#endif
44#include <string.h>
45
46#define SPT_NONE	0	/* don't use it at all */
47#define SPT_PSTAT	1	/* use pstat(PSTAT_SETCMD, ...) */
48#define SPT_REUSEARGV	2	/* cover argv with title information */
49
50#ifndef SPT_TYPE
51# define SPT_TYPE	SPT_NONE
52#endif
53
54#ifndef SPT_PADCHAR
55# define SPT_PADCHAR	'\0'
56#endif
57
58#if SPT_TYPE == SPT_REUSEARGV
59static char *argv_start = NULL;
60static size_t argv_env_len = 0;
61#endif
62
63#endif /* HAVE_SETPROCTITLE */
64
65void
66compat_init_setproctitle(int argc, char *argv[])
67{
68#if defined(SPT_TYPE) && SPT_TYPE == SPT_REUSEARGV
69	extern char **environ;
70	char *lastargv = NULL;
71	char **envp = environ;
72	int i;
73
74	/*
75	 * NB: This assumes that argv has already been copied out of the
76	 * way. This is true for sshd, but may not be true for other
77	 * programs. Beware.
78	 */
79
80	if (argc == 0 || argv[0] == NULL)
81		return;
82
83	/* Fail if we can't allocate room for the new environment */
84	for (i = 0; envp[i] != NULL; i++)
85		;
86	if ((environ = calloc(i + 1, sizeof(*environ))) == NULL) {
87		environ = envp;	/* put it back */
88		return;
89	}
90
91	/*
92	 * Find the last argv string or environment variable within
93	 * our process memory area.
94	 */
95	for (i = 0; i < argc; i++) {
96		if (lastargv == NULL || lastargv + 1 == argv[i])
97			lastargv = argv[i] + strlen(argv[i]);
98	}
99	for (i = 0; envp[i] != NULL; i++) {
100		if (lastargv + 1 == envp[i])
101			lastargv = envp[i] + strlen(envp[i]);
102	}
103
104	argv[1] = NULL;
105	argv_start = argv[0];
106	argv_env_len = lastargv - argv[0] - 1;
107
108	/*
109	 * Copy environment
110	 * XXX - will truncate env on strdup fail
111	 */
112	for (i = 0; envp[i] != NULL; i++)
113		environ[i] = strdup(envp[i]);
114	environ[i] = NULL;
115#endif /* SPT_REUSEARGV */
116}
117
118#ifndef HAVE_SETPROCTITLE
119void
120setproctitle(const char *fmt, ...)
121{
122#if SPT_TYPE != SPT_NONE
123	va_list ap;
124	char buf[1024];
125	size_t len;
126	extern char *__progname;
127#if SPT_TYPE == SPT_PSTAT
128	union pstun pst;
129#endif
130
131#if SPT_TYPE == SPT_REUSEARGV
132	if (argv_env_len <= 0)
133		return;
134#endif
135
136	strlcpy(buf, __progname, sizeof(buf));
137
138	va_start(ap, fmt);
139	if (fmt != NULL) {
140		len = strlcat(buf, ": ", sizeof(buf));
141		if (len < sizeof(buf))
142			vsnprintf(buf + len, sizeof(buf) - len , fmt, ap);
143	}
144	va_end(ap);
145
146#if SPT_TYPE == SPT_PSTAT
147	pst.pst_command = buf;
148	pstat(PSTAT_SETCMD, pst, strlen(buf), 0, 0);
149#elif SPT_TYPE == SPT_REUSEARGV
150/*	debug("setproctitle: copy \"%s\" into len %d",
151	    buf, argv_env_len); */
152	len = strlcpy(argv_start, buf, argv_env_len);
153	for(; len < argv_env_len; len++)
154		argv_start[len] = SPT_PADCHAR;
155#endif
156
157#endif /* SPT_NONE */
158}
159
160#endif /* HAVE_SETPROCTITLE */
161