tor/src/or/directory.c

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/* Copyright 2001,2002,2003 Roger Dingledine, Matej Pfajfar. */
/* See LICENSE for licensing information */
/* $Id$ */
#include "or.h"
static int directory_send_command(connection_t *conn, int command);
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static int directory_handle_command(connection_t *conn);
/********* START VARIABLES **********/
extern or_options_t options; /* command-line and config-file options */
static char fetchstring[] = "GET / HTTP/1.0\r\n\r\n";
static char answerstring[] = "HTTP/1.0 200 OK\r\n\r\n";
static char the_directory[MAX_DIR_SIZE+1];
static int directorylen=0;
/********* END VARIABLES ************/
void directory_initiate_command(routerinfo_t *router, int command) {
connection_t *conn;
if(!router) { /* i guess they didn't have one in mind for me to use */
log_fn(LOG_WARN,"No running dirservers known. This is really bad.");
/* XXX never again will a directory fetch work. Should we exit here, or what? */
return;
}
#if 0 /* there's no problem with parallel get/posts now. whichever 'get' ends
last is the directory. */
if(connection_get_by_type(CONN_TYPE_DIR)) { /* there's already a dir conn running */
log_fn(LOG_DEBUG,"Canceling connect, dir conn already active.");
return;
}
#endif
if(command == DIR_CONN_STATE_CONNECTING_FETCH)
log_fn(LOG_DEBUG,"initiating directory fetch");
else
log_fn(LOG_DEBUG,"initiating directory upload");
conn = connection_new(CONN_TYPE_DIR);
/* set up conn so it's got all the data we need to remember */
conn->addr = router->addr;
conn->port = router->dir_port;
conn->address = tor_strdup(router->address);
conn->nickname = tor_strdup(router->nickname);
if (router->identity_pkey)
conn->identity_pkey = crypto_pk_dup_key(router->identity_pkey);
else {
log_fn(LOG_WARN, "No signing key known for dirserver %s; signature won't be checked", conn->address);
conn->identity_pkey = NULL;
/* XXX is there really any situation where router doesn't have an identity_pkey? */
}
if(connection_add(conn) < 0) { /* no space, forget it */
connection_free(conn);
return;
}
switch(connection_connect(conn, router->address, router->addr, router->dir_port)) {
case -1:
router_mark_as_down(conn->nickname); /* don't try him again */
connection_remove(conn);
connection_free(conn);
return;
case 0:
connection_set_poll_socket(conn);
connection_watch_events(conn, POLLIN | POLLOUT | POLLERR);
/* writable indicates finish, readable indicates broken link,
error indicates broken link in windowsland. */
conn->state = command;
return;
/* case 1: fall through */
}
connection_set_poll_socket(conn);
if(directory_send_command(conn, command) < 0) {
connection_remove(conn);
connection_free(conn);
}
}
static int directory_send_command(connection_t *conn, int command) {
const char *s;
char tmp[8192];
assert(conn && conn->type == CONN_TYPE_DIR);
switch(command) {
case DIR_CONN_STATE_CONNECTING_FETCH:
connection_write_to_buf(fetchstring, strlen(fetchstring), conn);
conn->state = DIR_CONN_STATE_CLIENT_SENDING_FETCH;
break;
case DIR_CONN_STATE_CONNECTING_UPLOAD:
s = router_get_my_descriptor();
if(!s) {
log_fn(LOG_WARN,"Failed to get my descriptor.");
return -1;
}
snprintf(tmp, sizeof(tmp), "POST / HTTP/1.0\r\nContent-Length: %d\r\n\r\n%s",
strlen(s), s);
connection_write_to_buf(tmp, strlen(tmp), conn);
conn->state = DIR_CONN_STATE_CLIENT_SENDING_UPLOAD;
break;
}
return 0;
}
int connection_dir_process_inbuf(connection_t *conn) {
assert(conn && conn->type == CONN_TYPE_DIR);
if(conn->inbuf_reached_eof) {
switch(conn->state) {
case DIR_CONN_STATE_CLIENT_READING_FETCH:
/* kill it, but first process the_directory and learn about new routers. */
switch(fetch_from_buf_http(conn->inbuf,
NULL, 0, the_directory, MAX_DIR_SIZE)) {
case -1: /* overflow */
log_fn(LOG_WARN,"'fetch' response too large. Failing.");
return -1;
case 0:
log_fn(LOG_INFO,"'fetch' response not all here, but we're at eof. Closing.");
return -1;
/* case 1, fall through */
}
/* XXX check headers, at least make sure returned 2xx */
directorylen = strlen(the_directory);
log_fn(LOG_INFO,"Received directory (size %d):\n%s", directorylen, the_directory);
if(directorylen == 0) {
log_fn(LOG_INFO,"Empty directory. Ignoring.");
return -1;
}
if(router_get_dir_from_string(the_directory, conn->identity_pkey) < 0){
log_fn(LOG_INFO,"...but parsing failed. Ignoring.");
} else {
log_fn(LOG_INFO,"and got an %s directory; updated routers.",
conn->identity_pkey ? "authenticated" : "unauthenticated");
}
if(options.OnionRouter) { /* connect to them all */
router_retry_connections();
}
return -1;
case DIR_CONN_STATE_CLIENT_READING_UPLOAD:
/* XXX make sure there's a 200 OK on the buffer */
log_fn(LOG_INFO,"eof while reading upload response. Finished.");
return -1;
default:
log_fn(LOG_INFO,"conn reached eof, not reading. Closing.");
return -1;
}
}
if(conn->state == DIR_CONN_STATE_SERVER_COMMAND_WAIT)
return directory_handle_command(conn);
/* XXX for READ states, might want to make sure inbuf isn't too big */
log_fn(LOG_DEBUG,"Got data, not eof. Leaving on inbuf.");
return 0;
}
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static int directory_handle_command(connection_t *conn) {
char headers[1024];
char body[50000]; /* XXX */
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size_t dlen;
const char *cp;
assert(conn && conn->type == CONN_TYPE_DIR);
switch(fetch_from_buf_http(conn->inbuf,
headers, sizeof(headers), body, sizeof(body))) {
case -1: /* overflow */
log_fn(LOG_WARN,"input too large. Failing.");
return -1;
case 0:
log_fn(LOG_DEBUG,"command not all here yet.");
return 0;
/* case 1, fall through */
}
log_fn(LOG_DEBUG,"headers '%s', body '%s'.",headers,body);
if(!strncasecmp(headers,"GET",3)) {
/* XXX should check url and http version */
log_fn(LOG_DEBUG,"Received GET command.");
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dlen = dirserv_get_directory(&cp);
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if(dlen == 0) {
log_fn(LOG_WARN,"My directory is empty. Closing.");
return -1; /* XXX send some helpful http error code */
}
log_fn(LOG_DEBUG,"Dumping directory to client.");
connection_write_to_buf(answerstring, strlen(answerstring), conn);
connection_write_to_buf(cp, dlen, conn);
conn->state = DIR_CONN_STATE_SERVER_WRITING;
return 0;
}
if(!strncasecmp(headers,"POST",4)) {
/* XXX should check url and http version */
log_fn(LOG_DEBUG,"Received POST command.");
cp = body;
if(dirserv_add_descriptor(&cp) < 0) {
log_fn(LOG_WARN,"dirserv_add_descriptor() failed. Dropping.");
return -1; /* XXX should write an http failed code */
}
dirserv_get_directory(&cp); /* rebuild and write to disk */
connection_write_to_buf(answerstring, strlen(answerstring), conn);
conn->state = DIR_CONN_STATE_SERVER_WRITING;
return 0;
}
log_fn(LOG_WARN,"Got headers with unknown command. Closing.");
return -1;
}
int connection_dir_finished_flushing(connection_t *conn) {
int e, len=sizeof(e);
assert(conn && conn->type == CONN_TYPE_DIR);
switch(conn->state) {
case DIR_CONN_STATE_CONNECTING_FETCH:
case DIR_CONN_STATE_CONNECTING_UPLOAD:
if (getsockopt(conn->s, SOL_SOCKET, SO_ERROR, (void*)&e, &len) < 0) { /* not yet */
if(!ERRNO_CONN_EINPROGRESS(errno)) {
log_fn(LOG_DEBUG,"in-progress connect failed. Removing.");
router_mark_as_down(conn->nickname); /* don't try him again */
return -1;
} else {
return 0; /* no change, see if next time is better */
}
}
/* the connect has finished. */
log_fn(LOG_INFO,"Dir connection to router %s:%u established.",
conn->address,conn->port);
return directory_send_command(conn, conn->state);
case DIR_CONN_STATE_CLIENT_SENDING_FETCH:
log_fn(LOG_DEBUG,"client finished sending fetch command.");
conn->state = DIR_CONN_STATE_CLIENT_READING_FETCH;
connection_watch_events(conn, POLLIN);
return 0;
case DIR_CONN_STATE_CLIENT_SENDING_UPLOAD:
log_fn(LOG_DEBUG,"client finished sending upload command.");
conn->state = DIR_CONN_STATE_CLIENT_READING_UPLOAD;
connection_watch_events(conn, POLLIN);
return 0;
case DIR_CONN_STATE_SERVER_WRITING:
log_fn(LOG_INFO,"Finished writing server response. Closing.");
return -1; /* kill it */
default:
log_fn(LOG_WARN,"BUG: called in unexpected state.");
return -1;
}
return 0;
}
/*
Local Variables:
mode:c
indent-tabs-mode:nil
c-basic-offset:2
End:
*/