openbsd-compat/setproctitle.c

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