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	/* cover argv with title information */
45 #define SPT_REUSEARGV	2	/* use pstat(PSTAT_SETCMD, ...) */
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
56 static char *argv_start = NULL;
57 static size_t argv_env_len = 0;
58 #endif
59 
60 #endif /* HAVE_SETPROCTITLE */
61 
62 void
63 compat_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
116 void
117 setproctitle(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