includes.c

   1 /*
   2  * firewall3 - 3rd OpenWrt UCI firewall implementation
   3  *
   4  *   Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include "includes.h"
  20
  21
  22 const struct fw3_option fw3_include_opts[] = {
  23         FW3_OPT("enabled",             bool,           include,     enabled),
  24
  25         FW3_OPT("path",                string,         include,     path),
  26         FW3_OPT("type",                include_type,   include,     type),
  27         FW3_OPT("family",              family,         include,     family),
  28         FW3_OPT("reload",              bool,           include,     reload),
  29
  30         { }
  31 };
  32
  33
  34 void
  35 fw3_load_includes(struct fw3_state *state, struct uci_package *p)
  36 {
  37         struct uci_section *s;
  38         struct uci_element *e;
  39         struct fw3_include *include;
  40
  41         INIT_LIST_HEAD(&state->includes);
  42
  43         uci_foreach_element(&p->sections, e)
  44         {
  45                 s = uci_to_section(e);
  46
  47                 if (strcmp(s->type, "include"))
  48                         continue;
  49
  50                 include = calloc(1, sizeof(*include));
  51                 if (!include)
  52                         continue;
  53
  54                 include->name = e->name;
  55                 include->enabled = true;
  56
  57                 fw3_parse_options(include, fw3_include_opts, s);
  58
  59                 if (!include->enabled)
  60                 {
  61                         fw3_free_include(include);
  62                         continue;
  63                 }
  64
  65                 if (!include->path)
  66                 {
  67                         warn_elem(e, "must specify a path");
  68                         fw3_free_include(include);
  69                         continue;
  70                 }
  71
  72                 if (include->type == FW3_INC_TYPE_RESTORE && !include->family)
  73                         warn_elem(e, "does not specify a family, include will get loaded "
  74                                      "with both iptables-restore and ip6tables-restore!");
  75
  76                 list_add_tail(&include->list, &state->includes);
  77                 continue;
  78         }
  79 }
  80
  81
  82 static void
  83 print_include(struct fw3_include *include)
  84 {
  85         FILE *f;
  86         char line[1024];
  87
  88         info(" * Loading include '%s'", include->path);
  89
  90         if (!(f = fopen(include->path, "r")))
  91         {
  92                 info("   ! Skipping due to open error: %s", strerror(errno));
  93                 return;
  94         }
  95
  96         while (fgets(line, sizeof(line), f))
  97                 fw3_pr(line);
  98
  99         fclose(f);
 100 }
 101
 102 void
 103 fw3_print_includes(struct fw3_state *state, enum fw3_family family, bool reload)
 104 {
 105         struct fw3_include *include;
 106
 107         bool exec = false;
 108         const char *restore = "iptables-restore";
 109
 110         if (family == FW3_FAMILY_V6)
 111                 restore = "ip6tables-restore";
 112
 113         list_for_each_entry(include, &state->includes, list)
 114         {
 115                 if (reload && !include->reload)
 116                         continue;
 117
 118                 if (include->type != FW3_INC_TYPE_RESTORE)
 119                         continue;
 120
 121                 if (!fw3_is_family(include, family))
 122                         continue;
 123
 124                 if (!exec)
 125                 {
 126                         exec = fw3_command_pipe(false, restore, "--noflush");
 127
 128                         if (!exec)
 129                                 return;
 130                 }
 131
 132                 print_include(include);
 133         }
 134
 135         if (exec)
 136                 fw3_command_close();
 137 }
 138
 139
 140 static void
 141 run_include(struct fw3_include *include)
 142 {
 143         int rv;
 144         struct stat s;
 145         const char *tmpl =
 146                 "config() { "
 147                         "echo \"You cannot use UCI in firewall includes!\" >&2; "
 148                         "exit 1; "
 149                 "}; . %s";
 150
 151         char buf[PATH_MAX + sizeof(tmpl)];
 152
 153         info(" * Running script '%s'", include->path);
 154
 155         if (stat(include->path, &s))
 156         {
 157                 info("   ! Skipping due to path error: %s", strerror(errno));
 158                 return;
 159         }
 160
 161         snprintf(buf, sizeof(buf), tmpl, include->path);
 162         rv = system(buf);
 163
 164         if (rv)
 165                 info("   ! Failed with exit code %u", WEXITSTATUS(rv));
 166 }
 167
 168 void
 169 fw3_run_includes(struct fw3_state *state, bool reload)
 170 {
 171         struct fw3_include *include;
 172
 173         list_for_each_entry(include, &state->includes, list)
 174         {
 175                 if (reload && !include->reload)
 176                         continue;
 177
 178                 if (include->type == FW3_INC_TYPE_SCRIPT)
 179                         run_include(include);
 180         }
 181 }