setproctitle.c revision 126274 
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 <unistd.h>
39#ifdef HAVE_SYS_PSTAT_H
40#include <sys/pstat.h>
41#endif
42
43#define SPT_NONE	0	/* don't use it at all */
44#define SPT_PSTAT	1	/* use pstat(PSTAT_SETCMD, ...) */
45#define SPT_REUSEARGV	2	/* cover argv with title information */
46
47#ifndef SPT_TYPE
48# define SPT_TYPE	SPT_NONE
49#endif
50
51#ifndef SPT_PADCHAR
52# define SPT_PADCHAR	'\0'
53#endif
54
55#if SPT_TYPE == SPT_REUSEARGV
56static char *argv_start = NULL;
57static size_t argv_env_len = 0;
58#endif
59
60#endif /* HAVE_SETPROCTITLE */
61
62void
63compat_init_setproctitle(int argc, char *argv[])
64{
65#if defined(SPT_TYPE) && SPT_TYPE == SPT_REUSEARGV
66	extern char **environ;
67	char *lastargv = NULL;
68	char **envp = environ;
69	int i;
70
71	/*
72	 * NB: This assumes that argv has already been copied out of the
73	 * way. This is true for sshd, but may not be true for other
74	 * programs. Beware.
75	 */
76
77	if (argc == 0 || argv[0] == NULL)
78		return;
79
80	/* Fail if we can't allocate room for the new environment */
81	for (i = 0; envp[i] != NULL; i++)
82		;
83	if ((environ = malloc(sizeof(*environ) * (i + 1))) == NULL) {
84		environ = envp;	/* put it back */
85		return;
86	}
87
88	/*
89	 * Find the last argv string or environment variable within
90	 * our process memory area.
91	 */
92	for (i = 0; i < argc; i++) {
93		if (lastargv == NULL || lastargv + 1 == argv[i])
94			lastargv = argv[i] + strlen(argv[i]);
95	}
96	for (i = 0; envp[i] != NULL; i++) {
97		if (lastargv + 1 == envp[i])
98			lastargv = envp[i] + strlen(envp[i]);
99	}
100
101	argv[1] = NULL;
102	argv_start = argv[0];
103	argv_env_len = lastargv - argv[0] - 1;
104
105	/*
106	 * Copy environment
107	 * XXX - will truncate env on strdup fail
108	 */
109	for (i = 0; envp[i] != NULL; i++)
110		environ[i] = strdup(envp[i]);
111	environ[i] = NULL;
112#endif /* SPT_REUSEARGV */
113}
114
115#ifndef HAVE_SETPROCTITLE
116void
117setproctitle(const char *fmt, ...)
118{
119#if SPT_TYPE != SPT_NONE
120	va_list ap;
121	char buf[1024];
122	size_t len;
123	extern char *__progname;
124#if SPT_TYPE == SPT_PSTAT
125	union pstun pst;
126#endif
127
128#if SPT_TYPE == SPT_REUSEARGV
129	if (argv_env_len <= 0)
130		return;
131#endif
132
133	strlcpy(buf, __progname, sizeof(buf));
134
135	va_start(ap, fmt);
136	if (fmt != NULL) {
137		len = strlcat(buf, ": ", sizeof(buf));
138		if (len < sizeof(buf))
139			vsnprintf(buf + len, sizeof(buf) - len , fmt, ap);
140	}
141	va_end(ap);
142
143#if SPT_TYPE == SPT_PSTAT
144	pst.pst_command = buf;
145	pstat(PSTAT_SETCMD, pst, strlen(buf), 0, 0);
146#elif SPT_TYPE == SPT_REUSEARGV
147/*	debug("setproctitle: copy \"%s\" into len %d",
148	    buf, argv_env_len); */
149	len = strlcpy(argv_start, buf, argv_env_len);
150	for(; len < argv_env_len; len++)
151		argv_start[len] = SPT_PADCHAR;
152#endif
153
154#endif /* SPT_NONE */
155}
156
157#endif /* HAVE_SETPROCTITLE */
158