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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 #include <vis.h>
47 
48 #define SPT_NONE	0	/* don't use it at all */
49 #define SPT_PSTAT	1	/* use pstat(PSTAT_SETCMD, ...) */
50 #define SPT_REUSEARGV	2	/* cover argv with title information */
51 
52 #ifndef SPT_TYPE
53 # define SPT_TYPE	SPT_NONE
54 #endif
55 
56 #ifndef SPT_PADCHAR
57 # define SPT_PADCHAR	'\0'
58 #endif
59 
60 #if SPT_TYPE == SPT_REUSEARGV
61 static char *argv_start = NULL;
62 static size_t argv_env_len = 0;
63 #endif
64 
65 #endif /* HAVE_SETPROCTITLE */
66 
67 void
compat_init_setproctitle(int argc,char * argv[])68 compat_init_setproctitle(int argc, char *argv[])
69 {
70 #if !defined(HAVE_SETPROCTITLE) && \
71     defined(SPT_TYPE) && SPT_TYPE == SPT_REUSEARGV
72 	extern char **environ;
73 	char *lastargv = NULL;
74 	char **envp = environ;
75 	int i;
76 
77 	/*
78 	 * NB: This assumes that argv has already been copied out of the
79 	 * way. This is true for sshd, but may not be true for other
80 	 * programs. Beware.
81 	 */
82 
83 	if (argc == 0 || argv[0] == NULL)
84 		return;
85 
86 	/* Fail if we can't allocate room for the new environment */
87 	for (i = 0; envp[i] != NULL; i++)
88 		;
89 	if ((environ = calloc(i + 1, sizeof(*environ))) == NULL) {
90 		environ = envp;	/* put it back */
91 		return;
92 	}
93 
94 	/*
95 	 * Find the last argv string or environment variable within
96 	 * our process memory area.
97 	 */
98 	for (i = 0; i < argc; i++) {
99 		if (lastargv == NULL || lastargv + 1 == argv[i])
100 			lastargv = argv[i] + strlen(argv[i]);
101 	}
102 	for (i = 0; envp[i] != NULL; i++) {
103 		if (lastargv + 1 == envp[i])
104 			lastargv = envp[i] + strlen(envp[i]);
105 	}
106 
107 	argv[1] = NULL;
108 	argv_start = argv[0];
109 	argv_env_len = lastargv - argv[0] - 1;
110 
111 	/*
112 	 * Copy environment
113 	 * XXX - will truncate env on strdup fail
114 	 */
115 	for (i = 0; envp[i] != NULL; i++)
116 		environ[i] = strdup(envp[i]);
117 	environ[i] = NULL;
118 #endif /* SPT_REUSEARGV */
119 }
120 
121 #ifndef HAVE_SETPROCTITLE
122 void
setproctitle(const char * fmt,...)123 setproctitle(const char *fmt, ...)
124 {
125 #if SPT_TYPE != SPT_NONE
126 	va_list ap;
127 	char buf[1024], ptitle[1024];
128 	size_t len;
129 	int r;
130 	extern char *__progname;
131 #if SPT_TYPE == SPT_PSTAT
132 	union pstun pst;
133 #endif
134 
135 #if SPT_TYPE == SPT_REUSEARGV
136 	if (argv_env_len <= 0)
137 		return;
138 #endif
139 
140 	strlcpy(buf, __progname, sizeof(buf));
141 
142 	r = -1;
143 	va_start(ap, fmt);
144 	if (fmt != NULL) {
145 		len = strlcat(buf, ": ", sizeof(buf));
146 		if (len < sizeof(buf))
147 			r = vsnprintf(buf + len, sizeof(buf) - len , fmt, ap);
148 	}
149 	va_end(ap);
150 	if (r == -1 || (size_t)r >= sizeof(buf) - len)
151 		return;
152 	strnvis(ptitle, buf, sizeof(ptitle),
153 	    VIS_CSTYLE|VIS_NL|VIS_TAB|VIS_OCTAL);
154 
155 #if SPT_TYPE == SPT_PSTAT
156 	pst.pst_command = ptitle;
157 	pstat(PSTAT_SETCMD, pst, strlen(ptitle), 0, 0);
158 #elif SPT_TYPE == SPT_REUSEARGV
159 /*	debug("setproctitle: copy \"%s\" into len %d",
160 	    buf, argv_env_len); */
161 	len = strlcpy(argv_start, ptitle, argv_env_len);
162 	for(; len < argv_env_len; len++)
163 		argv_start[len] = SPT_PADCHAR;
164 #endif
165 
166 #endif /* SPT_NONE */
167 }
168 
169 #endif /* HAVE_SETPROCTITLE */
170