1 /******************************************************************************/
2 /* pfixtools: a collection of postfix related tools */
4 /* ________________________________________________________________________ */
6 /* Redistribution and use in source and binary forms, with or without */
7 /* modification, are permitted provided that the following conditions */
10 /* 1. Redistributions of source code must retain the above copyright */
11 /* notice, this list of conditions and the following disclaimer. */
12 /* 2. Redistributions in binary form must reproduce the above copyright */
13 /* notice, this list of conditions and the following disclaimer in the */
14 /* documentation and/or other materials provided with the distribution. */
15 /* 3. The names of its contributors may not be used to endorse or promote */
16 /* products derived from this software without specific prior written */
19 /* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND */
20 /* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE */
21 /* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
22 /* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS */
23 /* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR */
24 /* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF */
25 /* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS */
26 /* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
27 /* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) */
28 /* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF */
29 /* THE POSSIBILITY OF SUCH DAMAGE. */
30 /******************************************************************************/
33 * Copyright © 2006-2007 Pierre Habouzit
34 * Copyright © 2008 Florent Bruneau
42 #include "policy_tokens.h"
45 #include "postlicyd.h"
47 #define DAEMON_NAME "postlicyd"
48 #define DAEMON_VERSION "0.2"
49 #define DEFAULT_PORT 10000
50 #define RUNAS_USER "nobody"
51 #define RUNAS_GROUP "nogroup"
55 static config_t *config = NULL;
58 static void *query_starter(server_t* server)
60 query_context_t *context = p_new(query_context_t, 1);
61 filter_context_prepare(&context->context, context);
65 static void query_stopper(void *data)
67 query_context_t **context = data;
69 filter_context_wipe(&(*context)->context);
74 static bool config_refresh(void *mconfig)
76 if (filter_running > 0) {
81 return config_reload(mconfig);
84 static void policy_answer(server_t *pcy, const char *message)
86 query_context_t *context = pcy->data;
87 const query_t* query = &context->query;
89 buffer_addstr(&pcy->obuf, "action=");
90 buffer_ensure(&pcy->obuf, m_strlen(message) + 64);
92 ssize_t size = array_size(pcy->obuf) - array_len(pcy->obuf);
93 ssize_t format_size = query_format(array_ptr(pcy->obuf, array_len(pcy->obuf)),
94 size, message, query);
95 if (format_size == -1) {
96 buffer_addstr(&pcy->obuf, message);
97 } else if (format_size > size) {
98 buffer_ensure(&pcy->obuf, format_size + 1);
99 query_format(array_ptr(pcy->obuf, array_len(pcy->obuf)),
100 array_size(pcy->obuf) - array_len(pcy->obuf),
102 array_len(pcy->obuf) += format_size;
104 array_len(pcy->obuf) += format_size;
106 buffer_addstr(&pcy->obuf, "\n\n");
107 buffer_consume(&pcy->ibuf, query->eoq - pcy->ibuf.data);
108 epoll_modify(pcy->fd, EPOLLIN | EPOLLOUT, pcy);
111 static const filter_t *next_filter(server_t *pcy, const filter_t *filter,
112 const query_t *query, const filter_hook_t *hook, bool *ok) {
114 warn("request client=%s, from=<%s>, to=<%s>: aborted",
116 query->sender == NULL ? "undefined" : query->sender,
117 query->recipient == NULL ? "undefined" : query->recipient);
120 } else if (hook->async) {
121 debug("request client=%s, from=<%s>, to=<%s>: "
122 "asynchronous filter from filter %s",
124 query->sender == NULL ? "undefined" : query->sender,
125 query->recipient == NULL ? "undefined" : query->recipient,
129 } else if (hook->postfix) {
130 info("request client=%s, from=<%s>, to=<%s>: "
131 "awswer %s from filter %s: \"%s\"",
133 query->sender == NULL ? "undefined" : query->sender,
134 query->recipient == NULL ? "undefined" : query->recipient,
135 htokens[hook->type], filter->name, hook->value);
136 policy_answer(pcy, hook->value);
140 debug("request client=%s, from=<%s>, to=<%s>: "
141 "awswer %s from filter %s: next filter %s",
143 query->sender == NULL ? "undefined" : query->sender,
144 query->recipient == NULL ? "undefined" : query->recipient,
145 htokens[hook->type], filter->name,
146 (array_ptr(config->filters, hook->filter_id))->name);
147 return array_ptr(config->filters, hook->filter_id);
151 static bool policy_process(server_t *pcy, const config_t *mconfig)
153 query_context_t *context = pcy->data;
154 const query_t* query = &context->query;
155 const filter_t *filter;
156 if (mconfig->entry_points[query->state] == -1) {
157 warn("no filter defined for current protocol_state (%d)", query->state);
160 if (context->context.current_filter != NULL) {
161 filter = context->context.current_filter;
163 filter = array_ptr(mconfig->filters, mconfig->entry_points[query->state]);
165 context->context.current_filter = NULL;
168 const filter_hook_t *hook = filter_run(filter, query, &context->context);
169 filter = next_filter(pcy, filter, query, hook, &ok);
170 if (filter == NULL) {
176 static int policy_run(server_t *pcy, void* vconfig)
182 int search_offs = MAX(0, (int)(pcy->ibuf.len - 1));
183 int nb = buffer_read(&pcy->ibuf, pcy->fd, -1);
185 query_context_t *context = pcy->data;
186 query_t *query = &context->query;
187 context->server = pcy;
188 const config_t *mconfig = vconfig;
191 if (errno == EAGAIN || errno == EINTR)
198 err("unexpected end of data");
202 if (!(eoq = strstr(pcy->ibuf.data + search_offs, "\n\n")))
205 if (!query_parse(pcy->data, pcy->ibuf.data))
207 query->eoq = eoq + strlen("\n\n");
208 epoll_modify(pcy->fd, 0, pcy);
209 return policy_process(pcy, mconfig) ? 0 : -1;
212 static void policy_async_handler(filter_context_t *context,
213 const filter_hook_t *hook)
216 const filter_t *filter = context->current_filter;
217 query_context_t *qctx = context->data;
218 query_t *query = &qctx->query;
219 server_t *server = qctx->server;
221 context->current_filter = next_filter(server, filter, query, hook, &ok);
222 if (context->current_filter != NULL) {
223 ok = policy_process(server, config);
226 server_release(server);
230 static int postlicyd_init(void)
232 filter_async_handler_register(policy_async_handler);
235 module_init(postlicyd_init);
237 int start_listener(int port)
239 return start_server(port, NULL, NULL);
242 /* administrivia {{{ */
246 fputs("usage: "DAEMON_NAME" [options] config\n"
249 " -l <port> port to listen to\n"
250 " -p <pidfile> file to write our pid to\n"
251 " -f stay in foreground\n"
252 " -d grow logging level\n"
253 " -u unsafe mode (don't drop privileges)\n"
259 int main(int argc, char *argv[])
262 const char *pidfile = NULL;
263 bool daemonize = true;
264 int port = DEFAULT_PORT;
265 bool port_from_cli = false;
267 for (int c = 0; (c = getopt(argc, argv, "ufd" "l:p:")) >= 0; ) {
277 port_from_cli = true;
295 if (argc - optind != 1) {
300 info("starting %s v%s...", DAEMON_NAME, DAEMON_VERSION);
302 if (pidfile_open(pidfile) < 0) {
303 crit("unable to write pidfile %s", pidfile);
307 if (drop_privileges(RUNAS_USER, RUNAS_GROUP) < 0) {
308 crit("unable to drop privileges");
312 config = config_read(argv[optind]);
313 if (config == NULL) {
316 if (port_from_cli || config->port == 0) {
320 if (daemonize && daemon_detach() < 0) {
321 crit("unable to fork");
327 if (start_listener(config->port) < 0) {
330 return server_loop(query_starter, query_stopper,
331 policy_run, config_refresh, config);