mdw@git.distorted.org.uk Git - fwd/blob - un.c

   1 /* -*-c-*-
   2  *
   3  * $Id: un.c,v 1.2 1999/07/27 18:30:53 mdw Exp $
   4  *
   5  * Protocol specific definitions for Unix-domain sockets
   6  *
   7  * (c) 1999 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of the `fw' port forwarder.
  13  *
  14  * `fw' is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * `fw' is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with `fw'; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: un.c,v $
  32  * Revision 1.2  1999/07/27 18:30:53  mdw
  33  * Various minor portability fixes.
  34  *
  35  * Revision 1.1  1999/07/26 23:34:11  mdw
  36  * New socket address types.
  37  *
  38  */
  39
  40 /*----- Header files ------------------------------------------------------*/
  41
  42 #include "config.h"
  43 #undef sun /* Cretins */
  44
  45 #include <ctype.h>
  46 #include <errno.h>
  47 #include <limits.h>
  48 #include <stddef.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52
  53 #include <sys/types.h>
  54 #include <unistd.h>
  55
  56 #include <sys/socket.h>
  57 #include <sys/un.h>
  58 #include <arpa/inet.h>
  59 #include <netdb.h>
  60
  61 #include <mLib/alloc.h>
  62 #include <mLib/dstr.h>
  63 #include <mLib/report.h>
  64 #include <mLib/sub.h>
  65
  66 #include "addr.h"
  67 #include "conf.h"
  68 #include "fattr.h"
  69 #include "fw.h"
  70 #include "reffd.h"
  71 #include "scan.h"
  72 #include "un.h"
  73
  74 /*----- Data structures ---------------------------------------------------*/
  75
  76 typedef struct un_addr {
  77   addr a;
  78   struct sockaddr_un sun;
  79 } un_addr;
  80
  81 typedef struct un_opts {
  82   addr_opts ao;
  83   fattr f;
  84 } un_opts;
  85
  86 /*----- Protocol operations -----------------------------------------------*/
  87
  88 /* --- @read@ --- */
  89
  90 static addr *un_read(scanner *sc, unsigned type)
  91 {
  92   dstr d = DSTR_INIT;
  93   un_addr *ua;
  94
  95   conf_name(sc, '/', &d);
  96   ua = xmalloc(sizeof(addr) +
  97                offsetof(struct sockaddr_un, sun_path) +
  98                d.len + 1);
  99   ua->a.ops = &un_ops;
 100   ua->a.sz = offsetof(struct sockaddr_un, sun_path) + d.len + 1;
 101   memset(&ua->sun, 0, ua->a.sz);
 102   ua->sun.sun_family = AF_UNIX;
 103   memcpy(ua->sun.sun_path, d.buf, d.len + 1);
 104   dstr_destroy(&d);
 105   return (&ua->a);
 106 }
 107
 108 /* --- @destroy@ --- */
 109
 110 static void un_destroy(addr *a)
 111 {
 112   un_addr *ua = (un_addr *)a;
 113   free(ua);
 114 }
 115
 116 /* --- @print@ --- */
 117
 118 static void un_print(addr *a, unsigned type, dstr *d)
 119 {
 120   un_addr *ua = (un_addr *)a;
 121   dstr_puts(d, "unix:");
 122   dstr_puts(d, ua->sun.sun_path);
 123 }
 124
 125 /* --- @initopts@ --- */
 126
 127 static addr_opts *un_initopts(void)
 128 {
 129   un_opts *uo = CREATE(un_opts);
 130   uo->f = fattr_global;
 131   return (&uo->ao);
 132 }
 133
 134 /* --- @option@ --- */
 135
 136 static int un_option(scanner *sc, addr_opts *ao)
 137 {
 138   un_opts *uo = (un_opts *)ao;
 139   CONF_BEGIN(sc, "unix", "Unix domain socket")
 140
 141   if (fattr_option(sc, uo ? &uo->f : &fattr_global))
 142     CONF_ACCEPT;
 143
 144   CONF_END;
 145 }
 146
 147 /* --- @accept@ --- */
 148
 149 static reffd *un_accept(int fd, addr_opts *ao, const char *desc)
 150 {
 151   int nfd;
 152   un_opts *uo = (un_opts *)ao;
 153
 154   /* --- Accept the new connection --- */
 155
 156   {
 157     char buf[PATH_MAX + sizeof(struct sockaddr)];
 158     struct sockaddr_un *sun = (struct sockaddr_un *)buf;
 159     int sunsz = sizeof(buf);
 160
 161     if ((nfd = accept(fd, (struct sockaddr *)sun, &sunsz)) < 0)
 162       return (0);
 163   }
 164
 165   /* --- Log the connection --- *
 166    *
 167    * It'd be really nice if I could find out who the user is, but I can't in
 168    * anything like a portable way.
 169    */
 170
 171   if (!(uo->ao.f & ADDRF_NOLOG))
 172     fw_log(-1, "[%s] accepted", desc);
 173   return (reffd_init(nfd));
 174 }
 175
 176 /* --- @freeopts@ --- */
 177
 178 static void un_freeopts(addr_opts *ao)
 179 {
 180   un_opts *uo = (un_opts *)ao;
 181   DESTROY(uo);
 182 }
 183
 184 /* --- @bound@ --- */
 185
 186 static void un_bound(addr *a, addr_opts *ao)
 187 {
 188   un_addr *ua = (un_addr *)a;
 189   un_opts *uo = (un_opts *)ao;
 190   if (fattr_apply(ua->sun.sun_path, &uo->f)) {
 191     dstr d = DSTR_INIT;
 192     un_print(a, ADDR_SRC, &d);
 193     fw_log(-1, "[%s] couldn't apply file attributes: %s",
 194            d.buf, strerror(errno));
 195     dstr_destroy(&d);
 196   }
 197 }
 198
 199 /* --- @unbind@ --- */
 200
 201 static void un_unbind(addr *a)
 202 {
 203   un_addr *ua = (un_addr *)a;
 204   unlink(ua->sun.sun_path);
 205 }
 206
 207 /* --- Protocol definition --- */
 208
 209 addr_ops un_ops = {
 210   "unix", PF_UNIX,
 211   un_read, un_destroy, un_print,
 212   un_initopts, un_option, un_accept, un_freeopts, un_bound, un_unbind
 213 };
 214
 215 /*----- That's all, folks -------------------------------------------------*/