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("path",                string,         include,     path),
  24         FW3_OPT("type",                include_type,   include,     type),
  25         FW3_OPT("family",              family,         include,     family),
  26
  27         { }
  28 };
  29
  30
  31 void
  32 fw3_load_includes(struct fw3_state *state, struct uci_package *p)
  33 {
  34         struct uci_section *s;
  35         struct uci_element *e;
  36         struct fw3_include *include;
  37
  38         INIT_LIST_HEAD(&state->includes);
  39
  40         uci_foreach_element(&p->sections, e)
  41         {
  42                 s = uci_to_section(e);
  43
  44                 if (strcmp(s->type, "include"))
  45                         continue;
  46
  47                 include = malloc(sizeof(*include));
  48
  49                 if (!include)
  50                         continue;
  51
  52                 memset(include, 0, sizeof(*include));
  53                 include->name = e->name;
  54
  55                 fw3_parse_options(include, fw3_include_opts, s);
  56
  57                 if (!include->path)
  58                 {
  59                         warn_elem(e, "must specify a path");
  60                         fw3_free_include(include);
  61                         continue;
  62                 }
  63
  64                 if (include->type == FW3_INC_TYPE_RESTORE && !include->family)
  65                         warn_elem(e, "does not specify a family, include will get loaded "
  66                                      "with both iptables-restore and ip6tables-restore!");
  67
  68                 list_add_tail(&include->list, &state->includes);
  69                 continue;
  70         }
  71 }
  72
  73
  74 static void
  75 print_include(enum fw3_family family, struct fw3_include *include)
  76 {
  77         FILE *f;
  78         char line[1024];
  79
  80         if (!fw3_is_family(include, family))
  81                 return;
  82
  83         info(" * Loading include '%s'", include->path);
  84
  85         if (!(f = fopen(include->path, "r")))
  86         {
  87                 info("   ! Skipping due to open error: %s", strerror(errno));
  88                 return;
  89         }
  90
  91         while (fgets(line, sizeof(line), f))
  92                 fw3_pr(line);
  93
  94         fclose(f);
  95 }
  96
  97 void
  98 fw3_print_includes(enum fw3_family family, struct fw3_state *state)
  99 {
 100         struct fw3_include *include;
 101
 102         list_for_each_entry(include, &state->includes, list)
 103                 if (include->type == FW3_INC_TYPE_RESTORE)
 104                         print_include(family, include);
 105 }
 106
 107
 108 static void
 109 run_include(struct fw3_include *include)
 110 {
 111         int rv;
 112         struct stat s;
 113         const char *tmpl =
 114                 "config() { "
 115                         "echo \"You cannot use UCI in firewall includes!\" >&2; "
 116                         "exit 1; "
 117                 "}; . %s";
 118
 119         char buf[PATH_MAX + sizeof(tmpl)];
 120
 121         info(" * Running script '%s'", include->path);
 122
 123         if (stat(include->path, &s))
 124         {
 125                 info("   ! Skipping due to path error: %s", strerror(errno));
 126                 return;
 127         }
 128
 129         snprintf(buf, sizeof(buf), tmpl, include->path);
 130         rv = system(buf);
 131
 132         if (rv)
 133                 info("   ! Failed with exit code %u", WEXITSTATUS(rv));
 134 }
 135
 136 void
 137 fw3_run_includes(struct fw3_state *state)
 138 {
 139         struct fw3_include *include;
 140
 141         list_for_each_entry(include, &state->includes, list)
 142                 if (include->type == FW3_INC_TYPE_SCRIPT)
 143                         run_include(include);
 144 }