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 = malloc(sizeof(*include));
  51
  52                 if (!include)
  53                         continue;
  54
  55                 memset(include, 0, sizeof(*include));
  56
  57                 include->name = e->name;
  58                 include->enabled = true;
  59
  60                 fw3_parse_options(include, fw3_include_opts, s);
  61
  62                 if (!include->enabled)
  63                 {
  64                         fw3_free_include(include);
  65                         continue;
  66                 }
  67
  68                 if (!include->path)
  69                 {
  70                         warn_elem(e, "must specify a path");
  71                         fw3_free_include(include);
  72                         continue;
  73                 }
  74
  75                 if (include->type == FW3_INC_TYPE_RESTORE && !include->family)
  76                         warn_elem(e, "does not specify a family, include will get loaded "
  77                                      "with both iptables-restore and ip6tables-restore!");
  78
  79                 list_add_tail(&include->list, &state->includes);
  80                 continue;
  81         }
  82 }
  83
  84
  85 static void
  86 print_include(struct fw3_include *include)
  87 {
  88         FILE *f;
  89         char line[1024];
  90
  91         info(" * Loading include '%s'", include->path);
  92
  93         if (!(f = fopen(include->path, "r")))
  94         {
  95                 info("   ! Skipping due to open error: %s", strerror(errno));
  96                 return;
  97         }
  98
  99         while (fgets(line, sizeof(line), f))
 100                 fw3_pr(line);
 101
 102         fclose(f);
 103 }
 104
 105 void
 106 fw3_print_includes(struct fw3_state *state, enum fw3_family family, bool reload)
 107 {
 108         struct fw3_include *include;
 109
 110         bool exec = false;
 111         const char *restore = "iptables-restore";
 112
 113         if (family == FW3_FAMILY_V6)
 114                 restore = "ip6tables-restore";
 115
 116         list_for_each_entry(include, &state->includes, list)
 117         {
 118                 if (reload && !include->reload)
 119                         continue;
 120
 121                 if (include->type != FW3_INC_TYPE_RESTORE)
 122                         continue;
 123
 124                 if (!fw3_is_family(include, family))
 125                         continue;
 126
 127                 if (!exec)
 128                 {
 129                         exec = fw3_command_pipe(false, restore, "--noflush");
 130
 131                         if (!exec)
 132                                 return;
 133                 }
 134
 135                 print_include(include);
 136         }
 137
 138         fw3_command_close();
 139 }
 140
 141
 142 static void
 143 run_include(struct fw3_include *include)
 144 {
 145         int rv;
 146         struct stat s;
 147         const char *tmpl =
 148                 "config() { "
 149                         "echo \"You cannot use UCI in firewall includes!\" >&2; "
 150                         "exit 1; "
 151                 "}; . %s";
 152
 153         char buf[PATH_MAX + sizeof(tmpl)];
 154
 155         info(" * Running script '%s'", include->path);
 156
 157         if (stat(include->path, &s))
 158         {
 159                 info("   ! Skipping due to path error: %s", strerror(errno));
 160                 return;
 161         }
 162
 163         snprintf(buf, sizeof(buf), tmpl, include->path);
 164         rv = system(buf);
 165
 166         if (rv)
 167                 info("   ! Failed with exit code %u", WEXITSTATUS(rv));
 168 }
 169
 170 void
 171 fw3_run_includes(struct fw3_state *state, bool reload)
 172 {
 173         struct fw3_include *include;
 174
 175         list_for_each_entry(include, &state->includes, list)
 176         {
 177                 if (reload && !include->reload)
 178                         continue;
 179
 180                 if (include->type == FW3_INC_TYPE_SCRIPT)
 181                         run_include(include);
 182         }
 183 }