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

   1 /* -*-c-*-
   2  *
   3  * $Id: un.c,v 1.3 2000/08/01 17:58:32 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 1.3  2000/08/01 17:58:32  mdw
  33  * Remove unnecessary <ctype.h> header.
  34  *
  35  * Revision 1.2  1999/07/27 18:30:53  mdw
  36  * Various minor portability fixes.
  37  *
  38  * Revision 1.1  1999/07/26 23:34:11  mdw
  39  * New socket address types.
  40  *
  41  */
  42
  43 /*----- Header files ------------------------------------------------------*/
  44
  45 #include "config.h"
  46 #undef sun /* Cretins */
  47
  48 #include <errno.h>
  49 #include <limits.h>
  50 #include <stddef.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54
  55 #include <sys/types.h>
  56 #include <unistd.h>
  57
  58 #include <sys/socket.h>
  59 #include <sys/un.h>
  60 #include <arpa/inet.h>
  61 #include <netdb.h>
  62
  63 #include <mLib/alloc.h>
  64 #include <mLib/dstr.h>
  65 #include <mLib/report.h>
  66 #include <mLib/sub.h>
  67
  68 #include "addr.h"
  69 #include "conf.h"
  70 #include "fattr.h"
  71 #include "fw.h"
  72 #include "reffd.h"
  73 #include "scan.h"
  74 #include "un.h"
  75
  76 /*----- Data structures ---------------------------------------------------*/
  77
  78 typedef struct un_addr {
  79   addr a;
  80   struct sockaddr_un sun;
  81 } un_addr;
  82
  83 typedef struct un_opts {
  84   addr_opts ao;
  85   fattr f;
  86 } un_opts;
  87
  88 /*----- Protocol operations -----------------------------------------------*/
  89
  90 /* --- @read@ --- */
  91
  92 static addr *un_read(scanner *sc, unsigned type)
  93 {
  94   dstr d = DSTR_INIT;
  95   un_addr *ua;
  96
  97   conf_name(sc, '/', &d);
  98   ua = xmalloc(sizeof(addr) +
  99                offsetof(struct sockaddr_un, sun_path) +
 100                d.len + 1);
 101   ua->a.ops = &un_ops;
 102   ua->a.sz = offsetof(struct sockaddr_un, sun_path) + d.len + 1;
 103   memset(&ua->sun, 0, ua->a.sz);
 104   ua->sun.sun_family = AF_UNIX;
 105   memcpy(ua->sun.sun_path, d.buf, d.len + 1);
 106   dstr_destroy(&d);
 107   return (&ua->a);
 108 }
 109
 110 /* --- @destroy@ --- */
 111
 112 static void un_destroy(addr *a)
 113 {
 114   un_addr *ua = (un_addr *)a;
 115   free(ua);
 116 }
 117
 118 /* --- @print@ --- */
 119
 120 static void un_print(addr *a, unsigned type, dstr *d)
 121 {
 122   un_addr *ua = (un_addr *)a;
 123   dstr_puts(d, "unix:");
 124   dstr_puts(d, ua->sun.sun_path);
 125 }
 126
 127 /* --- @initopts@ --- */
 128
 129 static addr_opts *un_initopts(void)
 130 {
 131   un_opts *uo = CREATE(un_opts);
 132   uo->f = fattr_global;
 133   return (&uo->ao);
 134 }
 135
 136 /* --- @option@ --- */
 137
 138 static int un_option(scanner *sc, addr_opts *ao)
 139 {
 140   un_opts *uo = (un_opts *)ao;
 141   CONF_BEGIN(sc, "unix", "Unix domain socket")
 142
 143   if (fattr_option(sc, uo ? &uo->f : &fattr_global))
 144     CONF_ACCEPT;
 145
 146   CONF_END;
 147 }
 148
 149 /* --- @accept@ --- */
 150
 151 static reffd *un_accept(int fd, addr_opts *ao, const char *desc)
 152 {
 153   int nfd;
 154   un_opts *uo = (un_opts *)ao;
 155
 156   /* --- Accept the new connection --- */
 157
 158   {
 159     char buf[PATH_MAX + sizeof(struct sockaddr)];
 160     struct sockaddr_un *sun = (struct sockaddr_un *)buf;
 161     int sunsz = sizeof(buf);
 162
 163     if ((nfd = accept(fd, (struct sockaddr *)sun, &sunsz)) < 0)
 164       return (0);
 165   }
 166
 167   /* --- Log the connection --- *
 168    *
 169    * It'd be really nice if I could find out who the user is, but I can't in
 170    * anything like a portable way.
 171    */
 172
 173   if (!(uo->ao.f & ADDRF_NOLOG))
 174     fw_log(-1, "[%s] accepted", desc);
 175   return (reffd_init(nfd));
 176 }
 177
 178 /* --- @freeopts@ --- */
 179
 180 static void un_freeopts(addr_opts *ao)
 181 {
 182   un_opts *uo = (un_opts *)ao;
 183   DESTROY(uo);
 184 }
 185
 186 /* --- @bound@ --- */
 187
 188 static void un_bound(addr *a, addr_opts *ao)
 189 {
 190   un_addr *ua = (un_addr *)a;
 191   un_opts *uo = (un_opts *)ao;
 192   if (fattr_apply(ua->sun.sun_path, &uo->f)) {
 193     dstr d = DSTR_INIT;
 194     un_print(a, ADDR_SRC, &d);
 195     fw_log(-1, "[%s] couldn't apply file attributes: %s",
 196            d.buf, strerror(errno));
 197     dstr_destroy(&d);
 198   }
 199 }
 200
 201 /* --- @unbind@ --- */
 202
 203 static void un_unbind(addr *a)
 204 {
 205   un_addr *ua = (un_addr *)a;
 206   unlink(ua->sun.sun_path);
 207 }
 208
 209 /* --- Protocol definition --- */
 210
 211 addr_ops un_ops = {
 212   "unix", PF_UNIX,
 213   un_read, un_destroy, un_print,
 214   un_initopts, un_option, un_accept, un_freeopts, un_bound, un_unbind
 215 };
 216
 217 /*----- That's all, folks -------------------------------------------------*/