sbin/udevd/udevd_socket.c

   1 /*
   2  * Copyright (c) 2010 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Alex Hornung <ahornung@gmail.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 #include <sys/types.h>
  35 #include <sys/device.h>
  36 #include <sys/wait.h>
  37 #include <sys/stat.h>
  38 #include <sys/socket.h>
  39 #include <sys/un.h>
  40
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <fcntl.h>
  44 #include <libgen.h>
  45 #include <regex.h>
  46 #include <signal.h>
  47 #include <stdarg.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <syslog.h>
  52 #include <unistd.h>
  53
  54 #include <libprop/proplib.h>
  55 #include <sys/udev.h>
  56 #include "udevd.h"
  57
  58 int
  59 send_xml(int s, char *xml)
  60 {
  61         ssize_t r,n;
  62         size_t sz;
  63
  64         sz = strlen(xml) + 1;
  65
  66         r = send(s, &sz, sizeof(sz), 0);
  67         if (r <= 0)
  68                 return r;
  69
  70         r = 0;
  71         while (r < (ssize_t)sz) {
  72                 n = send(s, xml+r, sz-r, 0);
  73                 if (n <= 0)
  74                         return n;
  75                 r += n;
  76         }
  77
  78         return r;
  79 }
  80
  81 int
  82 read_xml(int s, char **buf)
  83 {
  84         char *xml;
  85         size_t sz;
  86         int n, r;
  87
  88         *buf = NULL;
  89
  90         n = recv(s, &sz, sizeof(sz), MSG_WAITALL);
  91         if ((n <= 0) || (sz > 12*1024*1024)) /* Arbitrary limit */
  92                 return n;
  93
  94         xml = malloc(sz+2);
  95         r = 0;
  96         while (r < (ssize_t)sz) {
  97                 n = recv(s, xml+r, sz-r, MSG_WAITALL);
  98                 if (n <= 0) {
  99                         free(xml);
 100                         return n;
 101                 }
 102                 r += n;
 103         }
 104
 105         *buf = xml;
 106         return r;
 107 }
 108
 109 int
 110 unblock_descriptor(int s)
 111 {
 112         int flags, ret;
 113
 114         flags = fcntl(s, F_GETFL, 0);
 115         ret = fcntl(s, F_SETFL, flags | O_NONBLOCK);
 116         return ret;
 117 }
 118
 119 int
 120 block_descriptor(int s)
 121 {
 122         int flags, ret;
 123
 124         flags = fcntl(s, F_GETFL, 0);
 125         ret = fcntl(s, F_SETFL, flags & ~O_NONBLOCK);
 126         return ret;
 127 }
 128
 129 int
 130 init_local_server(const char *sockfile, int socktype, int nonblock)
 131 {
 132         mode_t msk;
 133         int s;
 134         struct sockaddr_un un_addr;
 135
 136         if ((s = socket(AF_UNIX, socktype, 0)) < 0)
 137                 return -1;
 138
 139         memset(&un_addr, 0, sizeof(un_addr));
 140         un_addr.sun_family = AF_UNIX;
 141         strncpy(un_addr.sun_path, sockfile, SOCKFILE_NAMELEN);
 142         un_addr.sun_path[SOCKFILE_NAMELEN - 1] = '\0';
 143
 144         /*
 145          * DO NOT change `un_addr.sun_path' to `sockfile' here,
 146          * since `sockfile' may have been truncated by above strncpy(3).
 147          */
 148         unlink(un_addr.sun_path);
 149
 150         if (nonblock && unblock_descriptor(s) < 0) {
 151                 close(s);
 152                 return -1;
 153         }
 154
 155         msk = umask(S_IXUSR|S_IXGRP|S_IXOTH);
 156         if (bind(s, (struct sockaddr *)&un_addr, sizeof(un_addr)) < 0) {
 157                 close(s);
 158                 return -1;
 159         }
 160         umask(msk);      /* Restore the original mask */
 161
 162         if (socktype == SOCK_STREAM && listen(s, LOCAL_BACKLOG) < 0) {
 163                 close(s);
 164                 return -1;
 165         }
 166
 167         return s;
 168 }