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