hashquery.c

   1 /*
   2  * hashquery.c - CGI to handle SKS style /pks/hashquery requests
   3  *
   4  * Copyright 2011 Jonathan McDowell <noodles@earth.li>
   5  *
   6  * This program is free software: you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc., 51
  17  * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <stdint.h>
  24 #include <unistd.h>
  25
  26 #include "charfuncs.h"
  27 #include "cleanup.h"
  28 #include "keyid.h"
  29 #include "log.h"
  30 #include "marshal.h"
  31 #include "mem.h"
  32 #include "onak-conf.h"
  33
  34 void doerror(char *error)
  35 {
  36         printf("Content-Type: text/plain\n\n");
  37         printf("%s", error);
  38         cleanuplogthing();
  39         cleanupconfig();
  40         exit(EXIT_FAILURE);
  41 }
  42
  43 int main(int argc, char *argv[])
  44 {
  45         char *request_method;
  46         int count, found, i;
  47         uint8_t **hashes;
  48         struct buffer_ctx cgipostbuf;
  49         struct openpgp_publickey **keys;
  50
  51         readconfig(NULL);
  52         initlogthing("hashquery", config.logfile);
  53
  54         request_method = getenv("REQUEST_METHOD");
  55         if (request_method == NULL || strcmp(request_method, "POST") != 0) {
  56                 doerror("hashquery must be a HTTP POST request.\n");
  57         }
  58
  59         if (!(cgipostbuf.size = atoi(getenv("CONTENT_LENGTH")))) {
  60                 doerror("Must provide a content length.\n");
  61         }
  62
  63         cgipostbuf.offset = 0;
  64         cgipostbuf.buffer = malloc(cgipostbuf.size);
  65         if (cgipostbuf.buffer == NULL) {
  66                 doerror("Couldn't allocate memory for query content.\n");
  67         }
  68
  69         if (!fread(cgipostbuf.buffer, cgipostbuf.size, 1, stdin)) {
  70                 doerror("Couldn't read query.\n");
  71         }
  72
  73         hashes = (uint8_t **) unmarshal_array(buffer_fetchchar, &cgipostbuf,
  74                         (void * (*)(int (*)(void *, size_t,  void *), void *))
  75                                 unmarshal_skshash, &count);
  76
  77         free(cgipostbuf.buffer);
  78         cgipostbuf.buffer = NULL;
  79         cgipostbuf.size = cgipostbuf.offset = 0;
  80
  81         if (hashes == NULL) {
  82                 doerror("No hashes supplied.\n");
  83         }
  84
  85         found = 0;
  86         keys = calloc(sizeof(struct openpgp_publickey *), count);
  87         if (keys == NULL) {
  88                 doerror("Couldn't allocate memory for reply.\n");
  89         }
  90
  91         if (config.dbbackend->fetch_key_skshash == NULL) {
  92                 doerror("Can't fetch by skshash with this backend.");
  93         }
  94
  95         catchsignals();
  96         config.dbbackend->initdb(false);
  97
  98         for (i = 0; i < count; i++) {
  99                 config.dbbackend->fetch_key_skshash(
 100                                 (struct skshash *) hashes[i], &keys[found]);
 101                 if (keys[found] != NULL) {
 102                         found++;
 103                 }
 104                 free(hashes[i]);
 105                 hashes[i] = NULL;
 106         }
 107         free(hashes);
 108         hashes = NULL;
 109
 110         config.dbbackend->cleanupdb();
 111
 112         puts("Content-Type: pgp/keys\n");
 113         marshal_array(stdout_putchar, NULL,
 114                         (void (*)(int (*)(void *, size_t,  void *),
 115                                         void *, const void *))
 116                                 marshal_publickey, (void **) keys, found);
 117         printf("\n");
 118
 119         for (i = 0; i < found; i++) {
 120                 free_publickey(keys[i]);
 121         }
 122         free(keys);
 123
 124         cleanuplogthing();
 125         cleanupconfig();
 126 }