sbin/svc/subs.c

   1 /*
   2  * Copyright (c) 2014 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34 /*
  35  * Support routines
  36  */
  37
  38 #include "svc.h"
  39
  40 void
  41 sfree(char **strp)
  42 {
  43         if (*strp)
  44                 free(*strp);
  45 }
  46
  47 void
  48 sreplace(char **strp, const char *orig)
  49 {
  50         if (*strp) {
  51                 free(*strp);
  52                 *strp = NULL;
  53         }
  54         if (orig)
  55                 *strp = strdup(orig);
  56 }
  57
  58 void
  59 sdup(char **strp)
  60 {
  61         if (*strp)
  62                 *strp = strdup(*strp);
  63 }
  64
  65 void
  66 afree(char ***aryp)
  67 {
  68         char **ary = *aryp;
  69         int i;
  70
  71         if (ary) {
  72                 for (i = 0; ary[i]; ++i)
  73                         free(ary[i]);
  74                 free(ary);
  75         }
  76         *aryp = NULL;
  77 }
  78
  79 void
  80 adup(char ***aryp)
  81 {
  82         char **ary = *aryp;
  83         char **nary;
  84         int i;
  85
  86         if (ary) {
  87                 for (i = 0; ary[i]; ++i)
  88                         ;
  89                 nary = calloc(sizeof(char *), i + 1);
  90                 bcopy(ary, nary, sizeof(char *) * (i + 1));
  91                 for (i = 0; nary[i]; ++i)
  92                         nary[i] = strdup(nary[i]);
  93                 *aryp = nary;
  94         }
  95 }
  96
  97 /*
  98  * Sets up the pidfile and unix domain socket.  We do not yet know the
  99  * pid to store in the pidfile.
 100  */
 101 int
 102 setup_pid_and_socket(command_t *cmd, int *lfdp, int *pfdp)
 103 {
 104         struct sockaddr_un sou;
 105         size_t len;
 106         char *pidfile;
 107
 108         /*
 109          * Create and test the pidfile.
 110          */
 111         asprintf(&pidfile, "%s/service.%s.pid", cmd->piddir, cmd->label);
 112         *lfdp = -1;
 113         *pfdp = open(pidfile, O_RDWR|O_CREAT|O_EXLOCK|O_NONBLOCK, 0640);
 114         free(pidfile);
 115         if (*pfdp < 0) {
 116                 if (errno == EWOULDBLOCK) {
 117                         fprintf(cmd->fp, "Cannot init, %s is already active\n",
 118                                 cmd->label);
 119                 } else {
 120                         fprintf(cmd->fp,
 121                                 "Cannot init, unable to create \"%s\": %s\n",
 122                                 cmd->label,
 123                                 strerror(errno));
 124                 }
 125                 return 1;
 126         }
 127         ftruncate(*pfdp, 0);
 128
 129         /*
 130          * Create the unix-domain socket.
 131          */
 132         bzero(&sou, sizeof(sou));
 133         if ((*lfdp = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0) {
 134                 sou.sun_family = AF_UNIX;
 135                 snprintf(sou.sun_path, sizeof(sou.sun_path),
 136                          "%s/service.%s.sk", cmd->piddir, cmd->label);
 137                 len = strlen(sou.sun_path);
 138                 len = offsetof(struct sockaddr_un, sun_path[len+1]);
 139
 140                 /* remove stale file before trying to bind */
 141                 remove(sou.sun_path);
 142
 143                 if (bind(*lfdp, (void *)&sou, len) < 0) {
 144                         fprintf(cmd->fp, "Unable to bind \"%s\"\n",
 145                                 sou.sun_path);
 146                         close(*lfdp);
 147                         *lfdp = -1;
 148                 } else if (listen(*lfdp, 32) < 0) {
 149                         fprintf(cmd->fp, "Unable to listen on \"%s\"\n",
 150                                 sou.sun_path);
 151                         close(*lfdp);
 152                         *lfdp = -1;
 153                 }
 154         } else {
 155                 fprintf(cmd->fp, "Unable to create unix-domain socket\n");
 156         }
 157         if (*lfdp >= 0) {
 158                 return 0;
 159         } else {
 160                 close(*pfdp);
 161                 *pfdp = -1;
 162
 163                 return 1;
 164         }
 165 }
 166
 167 void
 168 remove_pid_and_socket(command_t *cmd, const char *label)
 169 {
 170         char *pidpath, *skpath;
 171
 172         asprintf(&pidpath, "%s/service.%s.pid", cmd->piddir, label);
 173         remove(pidpath);
 174         asprintf(&skpath, "%s/service.%s.sk", cmd->piddir, label);
 175         remove(skpath);
 176
 177         free(pidpath);
 178         free(skpath);
 179 }