--- /dev/null
+/*
+ * keydb_hkp.c - Routines to store and fetch keys from another keyserver.
+ *
+ * Copyright 2013 Jonathan McDowell <noodles@earth.li>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <curl/curl.h>
+
+#include "armor.h"
+#include "charfuncs.h"
+#include "keydb.h"
+#include "keystructs.h"
+#include "log.h"
+#include "mem.h"
+#include "onak-conf.h"
+#include "parsekey.h"
+
+static CURL *curl = NULL;
+
+/**
+ * initdb - Initialize the key database.
+ *
+ * We initialize CURL here.
+ */
+static void hkp_initdb(bool readonly)
+{
+ curl_global_init(CURL_GLOBAL_DEFAULT);
+ curl = curl_easy_init();
+}
+
+/**
+ * cleanupdb - De-initialize the key database.
+ *
+ * We cleanup CURL here.
+ */
+static void hkp_cleanupdb(void)
+{
+ if (curl) {
+ curl_easy_cleanup(curl);
+ curl = NULL;
+ }
+ curl_global_cleanup();
+}
+
+/**
+ * Receive data from a CURL request and process it into a buffer context.
+ */
+static size_t hkp_curl_recv_data(void *buffer, size_t size, size_t nmemb,
+ void *ctx)
+{
+ buffer_putchar(ctx, nmemb * size, buffer);
+
+ return (nmemb * size);
+}
+
+/**
+ * fetch_key - Given a keyid fetch the key from storage.
+ * @keyid: The keyid to fetch.
+ * @publickey: A pointer to a structure to return the key in.
+ * @intrans: If we're already in a transaction.
+ *
+ * We use the hex representation of the keyid as the filename to fetch the
+ * key from. The key is stored in the file as a binary OpenPGP stream of
+ * packets, so we can just use read_openpgp_stream() to read the packets
+ * in and then parse_keys() to parse the packets into a publickey
+ * structure.
+ */
+static int hkp_fetch_key(uint64_t keyid, struct openpgp_publickey **publickey,
+ bool intrans)
+{
+ struct openpgp_packet_list *packets = NULL;
+ char keyurl[1024];
+ CURLcode res;
+ struct buffer_ctx buf;
+
+ buf.offset = 0;
+ buf.size = 8192;
+ buf.buffer = malloc(8192);
+
+ snprintf(keyurl, sizeof(keyurl),
+ "http://%s:11371/pks/lookup?op=get&search=0x%08" PRIX64,
+ config.db_dir, keyid);
+
+ curl_easy_setopt(curl, CURLOPT_URL, keyurl);
+ curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION,
+ hkp_curl_recv_data);
+ curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buf);
+ res = curl_easy_perform(curl);
+
+ if (res == 0) {
+ buf.offset = 0;
+ dearmor_openpgp_stream(buffer_fetchchar, &buf, &packets);
+ parse_keys(packets, publickey);
+ free_packet_list(packets);
+ packets = NULL;
+ } else {
+ logthing(LOGTHING_ERROR, "Couldn't find key: %s (%d)",
+ curl_easy_strerror(res), res);
+ }
+
+ free(buf.buffer);
+ buf.offset = buf.size = 0;
+ buf.buffer = NULL;
+
+ return (res == 0) ? 1 : 0;
+}
+
+/**
+ * fetch_key_text - Tries to find the keys that contain the supplied text.
+ * @search: The text to search for.
+ * @publickey: A pointer to a structure to return the key in.
+ *
+ * This function searches for the supplied text and returns the keys that
+ * contain it.
+ *
+ * TODO: Write for flat file access. Some sort of grep?
+ */
+static int hkp_fetch_key_text(const char *search,
+ struct openpgp_publickey **publickey)
+{
+ struct openpgp_packet_list *packets = NULL;
+ char keyurl[1024];
+ CURLcode res;
+ struct buffer_ctx buf;
+ int count = 0;
+
+ buf.offset = 0;
+ buf.size = 8192;
+ buf.buffer = malloc(8192);
+
+ snprintf(keyurl, sizeof(keyurl),
+ "http://%s:11371/pks/lookup?op=get&search=%s",
+ config.db_dir, search);
+
+ curl_easy_setopt(curl, CURLOPT_URL, keyurl);
+ curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION,
+ hkp_curl_recv_data);
+ curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buf);
+ res = curl_easy_perform(curl);
+
+ if (res == 0) {
+ buf.offset = 0;
+ dearmor_openpgp_stream(buffer_fetchchar, &buf, &packets);
+ count = parse_keys(packets, publickey);
+ free_packet_list(packets);
+ packets = NULL;
+ } else {
+ logthing(LOGTHING_ERROR, "Couldn't find key: %s (%d)",
+ curl_easy_strerror(res), res);
+ }
+
+ free(buf.buffer);
+ buf.offset = buf.size = 0;
+ buf.buffer = NULL;
+
+ return count;
+}
+
+/**
+ * store_key - Takes a key and stores it.
+ * @publickey: A pointer to the public key to store.
+ * @intrans: If we're already in a transaction.
+ * @update: If true the key exists and should be updated.
+ *
+ */
+static int hkp_store_key(struct openpgp_publickey *publickey, bool intrans,
+ bool update)
+{
+ struct openpgp_packet_list *packets = NULL;
+ struct openpgp_packet_list *list_end = NULL;
+ char keyurl[1024];
+ CURLcode res;
+ struct buffer_ctx buf;
+ char *addform;
+
+ buf.offset = 0;
+ buf.size = 8192;
+ buf.buffer = malloc(8192);
+ buf.offset = snprintf(buf.buffer, buf.size, "keytextz");
+
+ flatten_publickey(publickey, &packets, &list_end);
+ armor_openpgp_stream(buffer_putchar, &buf, packets);
+ addform = curl_easy_escape(curl, buf.buffer, buf.offset);
+ addform[7] = '=';
+
+ snprintf(keyurl, sizeof(keyurl),
+ "http://%s:11371/pks/add",
+ config.db_dir);
+
+ curl_easy_setopt(curl, CURLOPT_URL, keyurl);
+ curl_easy_setopt(curl, CURLOPT_POSTFIELDS, addform);
+ curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION,
+ hkp_curl_recv_data);
+ buf.offset = 0;
+ curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buf);
+ res = curl_easy_perform(curl);
+
+ if (res != 0) {
+ logthing(LOGTHING_ERROR, "Couldn't send key: %s (%d)",
+ curl_easy_strerror(res), res);
+ }
+
+ curl_free(addform);
+
+ /* TODO: buf has any response text we might want to parse. */
+ free(buf.buffer);
+ buf.offset = buf.size = 0;
+ buf.buffer = NULL;
+
+ return (res == 0) ? 1 : 0;
+}
+
+/**
+ * delete_key - Given a keyid delete the key from storage.
+ * @keyid: The keyid to delete.
+ * @intrans: If we're already in a transaction.
+ *
+ * No op for HKP.
+ */
+static int hkp_delete_key(uint64_t keyid, bool intrans)
+{
+ return -1;
+}
+
+/**
+ * iterate_keys - call a function once for each key in the db.
+ * @iterfunc: The function to call.
+ * @ctx: A context pointer
+ *
+ * Not applicable for HKP backend.
+ */
+static int hkp_iterate_keys(void (*iterfunc)(void *ctx,
+ struct openpgp_publickey *key), void *ctx)
+{
+ return 0;
+}
+
+/**
+ * starttrans - Start a transaction.
+ *
+ * This is just a no-op for HKP access.
+ */
+static bool hkp_starttrans(void)
+{
+ return true;
+}
+
+/**
+ * endtrans - End a transaction.
+ *
+ * This is just a no-op for HKP access.
+ */
+static void hkp_endtrans(void)
+{
+ return;
+}
+
+/*
+ * Include the basic keydb routines.
+ */
+#define NEED_KEYID2UID 1
+#define NEED_GETKEYSIGS 1
+#define NEED_GETFULLKEYID 1
+#define NEED_UPDATEKEYS 1
+#include "keydb.c"
+
+struct dbfuncs keydb_hkp_funcs = {
+ .initdb = hkp_initdb,
+ .cleanupdb = hkp_cleanupdb,
+ .starttrans = hkp_starttrans,
+ .endtrans = hkp_endtrans,
+ .fetch_key = hkp_fetch_key,
+ .fetch_key_text = hkp_fetch_key_text,
+ .store_key = hkp_store_key,
+ .update_keys = generic_update_keys,
+ .delete_key = hkp_delete_key,
+ .getkeysigs = generic_getkeysigs,
+ .cached_getkeysigs = generic_cached_getkeysigs,
+ .keyid2uid = generic_keyid2uid,
+ .getfullkeyid = generic_getfullkeyid,
+ .iterate_keys = hkp_iterate_keys,
+};
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