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|
/* Copyright 2001,2002,2003 Roger Dingledine. */
/* See LICENSE for licensing information */
/* $Id$ */
#include "or.h"
/**
* \file directory.c
* \brief Implement directory HTTP protocol.
**/
/* In-points to directory.c:
*
* - directory_post_to_dirservers(), called from
* router_upload_dir_desc_to_dirservers() in router.c
* upload_service_descriptor() in rendservice.c
* - directory_get_from_dirserver(), called from
* rend_client_refetch_renddesc() in rendclient.c
* run_scheduled_events() in main.c
* do_hup() in main.c
* - connection_dir_process_inbuf(), called from
* connection_process_inbuf() in connection.c
* - connection_dir_finished_flushing(), called from
* connection_finished_flushing() in connection.c
* - connection_dir_finished_connecting(), called from
* connection_finished_connecting() in connection.c
*/
static void
directory_initiate_command_router(routerinfo_t *router, uint8_t purpose,
const char *payload, int payload_len);
static void
directory_initiate_command_trusted_dir(trusted_dir_server_t *dirserv,
uint8_t purpose, const char *payload, int payload_len);
static void
directory_initiate_command(const char *address, uint32_t addr, uint16_t port,
const char *platform,
const char *digest, uint8_t purpose,
const char *payload, int payload_len);
static void
directory_send_command(connection_t *conn, const char *platform,
uint16_t dir_port, int purpose,
const char *payload, int payload_len);
static int directory_handle_command(connection_t *conn);
/********* START VARIABLES **********/
extern or_options_t options; /* command-line and config-file options */
#if 0 /* commented out for now, since for now what clients send is
different from what servers want to receive */
/** URL for publishing rendezvous descriptors. */
char rend_publish_string[] = "/tor/rendezvous/publish";
/** Prefix for downloading rendezvous descriptors. */
char rend_fetch_url[] = "/tor/rendezvous/";
#endif
#define MAX_HEADERS_SIZE 50000
#define MAX_BODY_SIZE 500000
#define ALLOW_DIRECTORY_TIME_SKEW 30*60
/********* END VARIABLES ************/
/** Start a connection to every known directory server, using
* connection purpose 'purpose' and uploading the payload 'payload'
* (length 'payload_len'). The purpose should be one of
* 'DIR_PURPOSE_UPLOAD_DIR' or 'DIR_PURPOSE_UPLOAD_RENDDESC'.
*/
void
directory_post_to_dirservers(uint8_t purpose, const char *payload,
int payload_len)
{
int i;
routerinfo_t *router;
routerlist_t *rl;
router_get_routerlist(&rl);
if(!rl)
return;
for(i=0; i < smartlist_len(rl->routers); i++) {
router = smartlist_get(rl->routers, i);
/* Note: this posts our descriptor to ourselves, if we're an
* authdirserver. But I think that's ok. */
if(router->is_trusted_dir)
directory_initiate_command_router(router, purpose, payload, payload_len);
}
}
/** Start a connection to a random running directory server, using
* connection purpose 'purpose' requesting 'payload' (length
* 'payload_len'). The purpose should be one of
* 'DIR_PURPOSE_FETCH_DIR' or 'DIR_PURPOSE_FETCH_RENDDESC'.
*/
void
directory_get_from_dirserver(uint8_t purpose, const char *payload,
int payload_len)
{
routerinfo_t *r = NULL;
trusted_dir_server_t *ds = NULL;
if (purpose == DIR_PURPOSE_FETCH_DIR) {
if (advertised_server_mode()) {
/* only ask authdirservers, and don't ask myself */
r = router_pick_directory_server(1, 1);
/* XXXX NM Enable this once we actually set keys for dirservers.
* ds = router_pick_trusteddirserver(1);
*/
} else {
/* anybody with a non-zero dirport will do */
r = router_pick_directory_server(0, 1);
}
} else { // (purpose == DIR_PURPOSE_FETCH_RENDDESC)
/* only ask authdirservers, any of them will do */
r = router_pick_directory_server(1, 0);
/* XXXX NM Enable this once we actually set keys for dirservers.
* ds = router_pick_trusteddirserver(0);
*/
}
if (r)
directory_initiate_command_router(r, purpose, payload, payload_len);
else if (ds)
directory_initiate_command_trusted_dir(ds, purpose, payload, payload_len);
else
log_fn(LOG_WARN,"No running dirservers known. Not trying. (purpose %d)", purpose);
}
/** Launch a new connection to the directory server <b>router</b> to upload or
* download a service or rendezvous descriptor. <b>purpose</b> determines what
* kind of directory connection we're launching, and must be one of
* DIR_PURPOSE_{FETCH|UPLOAD}_{DIR|RENDDESC}.
*
* When uploading, <b>payload</b> and <b>payload_len</b> determine the content
* of the HTTP post. When fetching a rendezvous descriptor, <b>payload</b>
* and <b>payload_len</b> are the service ID we want to fetch.
*/
static void
directory_initiate_command_router(routerinfo_t *router, uint8_t purpose,
const char *payload, int payload_len)
{
directory_initiate_command(router->address, router->addr, router->dir_port,
router->platform, router->identity_digest,
purpose, payload, payload_len);
}
static void
directory_initiate_command_trusted_dir(trusted_dir_server_t *dirserv,
uint8_t purpose, const char *payload, int payload_len)
{
directory_initiate_command(dirserv->address, dirserv->addr, dirserv->dir_port,
NULL, dirserv->digest, purpose, payload, payload_len);
}
static void
directory_initiate_command(const char *address, uint32_t addr,
uint16_t dir_port, const char *platform,
const char *digest, uint8_t purpose,
const char *payload, int payload_len)
{
connection_t *conn;
tor_assert(address && addr && dir_port && digest);
switch (purpose) {
case DIR_PURPOSE_FETCH_DIR:
log_fn(LOG_DEBUG,"initiating directory fetch");
break;
case DIR_PURPOSE_FETCH_RENDDESC:
log_fn(LOG_DEBUG,"initiating hidden-service descriptor fetch");
break;
case DIR_PURPOSE_UPLOAD_DIR:
log_fn(LOG_DEBUG,"initiating server descriptor upload");
break;
case DIR_PURPOSE_UPLOAD_RENDDESC:
log_fn(LOG_DEBUG,"initiating hidden-service descriptor upload");
break;
default:
log_fn(LOG_ERR, "Unrecognized directory connection purpose.");
tor_assert(0);
}
conn = connection_new(CONN_TYPE_DIR);
/* set up conn so it's got all the data we need to remember */
if(options.HttpProxy) {
conn->addr = options.HttpProxyAddr;
conn->port = options.HttpProxyPort;
} else {
conn->addr = addr;
conn->port = dir_port;
}
conn->address = tor_strdup(address);
/* conn->nickname = tor_strdup(router->nickname); */
/* tor_assert(router->identity_pkey); */
/* conn->identity_pkey = crypto_pk_dup_key(router->identity_pkey); */
/* crypto_pk_get_digest(conn->identity_pkey, conn->identity_digest); */
memcpy(conn->identity_digest, digest, DIGEST_LEN);
conn->purpose = purpose;
/* give it an initial state */
conn->state = DIR_CONN_STATE_CONNECTING;
if(purpose == DIR_PURPOSE_FETCH_DIR ||
purpose == DIR_PURPOSE_UPLOAD_DIR) {
/* then we want to connect directly */
switch(connection_connect(conn, conn->address, conn->addr, conn->port)) {
case -1:
router_mark_as_down(conn->identity_digest); /* don't try him again */
if(purpose == DIR_PURPOSE_FETCH_DIR && !all_directory_servers_down()) {
log_fn(LOG_INFO,"Giving up on dirserver %s; trying another.", conn->nickname);
directory_get_from_dirserver(purpose, payload, payload_len);
}
connection_free(conn);
return;
case 1:
conn->state = DIR_CONN_STATE_CLIENT_SENDING; /* start flushing conn */
/* fall through */
case 0:
/* queue the command on the outbuf */
directory_send_command(conn, platform, dir_port,
purpose, payload, payload_len);
connection_watch_events(conn, POLLIN | POLLOUT | POLLERR);
/* writable indicates finish, readable indicates broken link,
error indicates broken link in windowsland. */
}
} else { /* we want to connect via tor */
/* make an AP connection
* populate it and add it at the right state
* socketpair and hook up both sides
*/
conn->s = connection_ap_make_bridge(conn->address, conn->port);
if(conn->s < 0) {
log_fn(LOG_WARN,"Making AP bridge to dirserver failed.");
connection_mark_for_close(conn);
return;
}
conn->state = DIR_CONN_STATE_CLIENT_SENDING;
connection_add(conn);
/* queue the command on the outbuf */
directory_send_command(conn, platform, dir_port,
purpose, payload, payload_len);
connection_watch_events(conn, POLLIN | POLLOUT | POLLERR);
}
}
/** Queue an appropriate HTTP command on conn-\>outbuf. The args
* <b>purpose</b>, <b>payload</b>, and <b>payload_len</b> are as in
* directory_initiate_command.
*/
static void
directory_send_command(connection_t *conn, const char *platform,
uint16_t dir_port, int purpose,
const char *payload, int payload_len) {
char tmp[8192];
char proxystring[128];
char hoststring[128];
char url[128];
int use_newer = 0;
char *httpcommand = NULL;
tor_assert(conn && conn->type == CONN_TYPE_DIR);
tor_assert(dir_port && conn);
/* If we don't know the platform, assume it's up-to-date. */
use_newer = platform ? tor_version_as_new_as(platform, "0.0.9pre1"):1;
if(dir_port == 80) {
strlcpy(hoststring, conn->address, sizeof(hoststring));
} else {
sprintf(hoststring, "%s:%d", conn->address, dir_port);
}
if(options.HttpProxy) {
sprintf(proxystring, "http://%s", hoststring);
} else {
proxystring[0] = 0;
}
switch(purpose) {
case DIR_PURPOSE_FETCH_DIR:
tor_assert(payload == NULL);
log_fn(LOG_DEBUG, "Asking for %scompressed directory from server running %s",
use_newer?"":"un", platform?platform:"<unknown version>");
httpcommand = "GET";
strlcpy(url, use_newer ? "/tor/dir.z" : "/", sizeof(url));
break;
case DIR_PURPOSE_FETCH_RUNNING_LIST:
tor_assert(payload == NULL);
httpcommand = "GET";
strlcpy(url, use_newer ? "/tor/running-routers" : "/running-routers", sizeof(url));
break;
case DIR_PURPOSE_UPLOAD_DIR:
tor_assert(payload);
httpcommand = "POST";
strlcpy(url, use_newer ? "/tor/" : "/", sizeof(url));
break;
case DIR_PURPOSE_FETCH_RENDDESC:
tor_assert(payload);
/* this must be true or we wouldn't be doing the lookup */
tor_assert(payload_len <= REND_SERVICE_ID_LEN);
/* This breaks the function abstraction. */
memcpy(conn->rend_query, payload, payload_len);
conn->rend_query[payload_len] = 0;
httpcommand = "GET";
sprintf(url, "%s/rendezvous/%s", use_newer ? "/tor" : "", payload);
/* XXX We're using payload here to mean something other than
* payload of the http post. This is probably bad, and should
* be fixed one day. Kludge for now to make sure we don't post more. */
payload_len = 0;
payload = NULL;
break;
case DIR_PURPOSE_UPLOAD_RENDDESC:
tor_assert(payload);
httpcommand = "POST";
sprintf(url, "%s/rendezvous/publish", use_newer ? "/tor" : "");
break;
}
snprintf(tmp, sizeof(tmp), "%s %s%s HTTP/1.0\r\nContent-Length: %d\r\nHost: %s\r\n\r\n",
httpcommand,
proxystring,
url,
payload_len,
hoststring);
connection_write_to_buf(tmp, strlen(tmp), conn);
if(payload) {
/* then send the payload afterwards too */
connection_write_to_buf(payload, payload_len, conn);
}
}
/** Parse an HTTP request string <b>headers</b> of the form
* "\%s [http[s]://]\%s HTTP/1..."
* If it's well-formed, strdup the second \%s into *<b>url</b>, and
* null-terminate it. If the url doesn't start with "/tor/", rewrite it
* so it does. Return 0.
* Otherwise, return -1.
*/
static int
parse_http_url(char *headers, char **url)
{
char *s, *start, *tmp;
s = (char *)eat_whitespace_no_nl(headers);
if (!*s) return -1;
s = (char *)find_whitespace(s); /* get past GET/POST */
if (!*s) return -1;
s = (char *)eat_whitespace_no_nl(s);
if (!*s) return -1;
start = s; /* this is it, assuming it's valid */
s = (char *)find_whitespace(start);
if (!*s) return -1;
/* tolerate the http[s] proxy style of putting the hostname in the url */
if(s-start >= 4 && !strcmpstart(start,"http")) {
tmp = start + 4;
if(*tmp == 's')
tmp++;
if(s-tmp >= 3 && !strcmpstart(tmp,"://")) {
tmp = strchr(tmp+3, '/');
if(tmp && tmp < s) {
log_fn(LOG_DEBUG,"Skipping over 'http[s]://hostname' string");
start = tmp;
}
}
}
if(s-start < 5 || strcmpstart(start,"/tor/")) { /* need to rewrite it */
*url = tor_malloc(s - start + 5);
strcpy(*url,"/tor");
strlcpy((*url)+4, start, s-start+1);
(*url)[s-start+4] = 0; /* null terminate it */
} else {
*url = tor_strndup(start, s-start);
}
return 0;
}
/** Parse an HTTP response string <b>headers</b> of the form
* "HTTP/1.\%d \%d\%s\r\n...".
* If it's well-formed, assign *<b>code</b>, point *<b>message</b> to the first
* non-space character after code if there is one and message is non-NULL
* (else leave it alone), and return 0.
* If <b>date</b> is provided, set *date to the Date header in the
* http headers, or 0 if no such header is found.
* Otherwise, return -1.
*/
static int
parse_http_response(char *headers, int *code, char **message, time_t *date,
int *compression)
{
int n1, n2;
char datestr[RFC1123_TIME_LEN+1];
smartlist_t *parsed_headers;
tor_assert(headers && code);
while(isspace((int)*headers)) headers++; /* tolerate leading whitespace */
if(sscanf(headers, "HTTP/1.%d %d", &n1, &n2) < 2 ||
(n1 != 0 && n1 != 1) ||
(n2 < 100 || n2 >= 600)) {
log_fn(LOG_WARN,"Failed to parse header '%s'",headers);
return -1;
}
*code = n2;
if(message) {
/* XXX should set *message correctly */
}
parsed_headers = smartlist_create();
smartlist_split_string(parsed_headers, headers, "\n",
SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
if (date) {
*date = 0;
SMARTLIST_FOREACH(parsed_headers, const char *, s,
if (!strcmpstart(s, "Date: ")) {
strlcpy(datestr, s+6, sizeof(datestr));
/* This will do nothing on failure, so we don't need to check
the result. We shouldn't warn, since there are many other valid
date formats besides the one we use. */
parse_rfc1123_time(datestr, date);
break;
});
}
if (compression) {
const char *enc = NULL;
SMARTLIST_FOREACH(parsed_headers, const char *, s,
if (!strcmpstart(s, "Content-Encoding: ")) {
enc = s+18; break;
});
if (!enc || !strcmp(enc, "identity")) {
*compression = 0;
} else if (!strcmp(enc, "deflate") || !strcmp(enc, "x-deflate")) {
*compression = ZLIB_METHOD;
} else if (!strcmp(enc, "gzip") || !strcmp(enc, "x-gzip")) {
*compression = GZIP_METHOD;
} else {
log_fn(LOG_WARN, "Unrecognized content encoding: '%s'", enc);
*compression = 0;
}
}
SMARTLIST_FOREACH(parsed_headers, char *, s, tor_free(s));
smartlist_free(parsed_headers);
return 0;
}
/** We are a client, and we've finished reading the server's
* response. Parse and it and act appropriately.
*
* Return -1 if an error has occurred, or 0 normally. The caller
* will take care of marking the connection for close.
*/
static int
connection_dir_client_reached_eof(connection_t *conn)
{
char *body;
char *headers;
int body_len=0;
int status_code;
time_t now, date_header=0;
int delta;
int compression;
switch(fetch_from_buf_http(conn->inbuf,
&headers, MAX_HEADERS_SIZE,
&body, &body_len, 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 */
}
if(parse_http_response(headers, &status_code, NULL, &date_header,
&compression) < 0) {
log_fn(LOG_WARN,"Unparseable headers. Closing.");
tor_free(body); tor_free(headers);
return -1;
}
if (date_header > 0) {
now = time(NULL);
delta = now-date_header;
if (abs(delta)>ALLOW_DIRECTORY_TIME_SKEW) {
log_fn(LOG_WARN, "Received directory with skewed time: we are %d minutes %s, or the directory is %d minutes %s.",
abs(delta)/60, delta>0 ? "ahead" : "behind",
abs(delta)/60, delta>0 ? "behind" : "ahead");
} else {
log_fn(LOG_INFO, "Time on received directory is within tolerance; we are %d seconds skewed. (That's okay.)", delta);
}
}
if (compression != 0) {
char *new_body;
size_t new_len;
if (tor_gzip_uncompress(&new_body, &new_len, body, body_len, compression)) {
log_fn(LOG_WARN, "Unable to decompress HTTP body.");
tor_free(body); tor_free(headers);
return -1;
}
tor_free(body);
body = new_body;
body_len = (int)new_len;
}
if(conn->purpose == DIR_PURPOSE_FETCH_DIR) {
/* fetch/process the directory to learn about new routers. */
log_fn(LOG_INFO,"Received directory (size %d):\n%s", body_len, body);
if(status_code == 503 || body_len == 0) {
log_fn(LOG_INFO,"Empty directory. Ignoring.");
tor_free(body); tor_free(headers);
return 0;
}
if(status_code != 200) {
log_fn(LOG_WARN,"Received http status code %d from dirserver. Failing.",
status_code);
tor_free(body); tor_free(headers);
return -1;
}
if(router_load_routerlist_from_directory(body, NULL, 1) < 0){
log_fn(LOG_WARN,"I failed to parse the directory I fetched from %s:%d. Ignoring.", conn->address, conn->port);
} else {
log_fn(LOG_INFO,"updated routers.");
}
directory_has_arrived(); /* do things we've been waiting to do */
}
if(conn->purpose == DIR_PURPOSE_FETCH_RUNNING_LIST) {
running_routers_t *rrs;
routerlist_t *rl;
/* just update our list of running routers, if this list is new info */
log_fn(LOG_INFO,"Received running-routers list (size %d):\n%s", body_len, body);
if(status_code != 200) {
log_fn(LOG_WARN,"Received http status code %d from dirserver. Failing.",
status_code);
tor_free(body); tor_free(headers);
return -1;
}
if (!(rrs = router_parse_runningrouters(body))) {
log_fn(LOG_WARN, "Can't parse runningrouters list");
tor_free(body); tor_free(headers);
return -1;
}
router_get_routerlist(&rl);
routerlist_update_from_runningrouters(rl,rrs);
running_routers_free(rrs);
}
if(conn->purpose == DIR_PURPOSE_UPLOAD_DIR) {
switch(status_code) {
case 200:
log_fn(LOG_INFO,"eof (status 200) after uploading server descriptor: finished.");
break;
case 400:
log_fn(LOG_WARN,"http status 400 (bad request) response from dirserver. Malformed server descriptor?");
break;
case 403:
log_fn(LOG_WARN,"http status 403 (unapproved server) response from dirserver. Is your clock skewed? Have you mailed us your identity fingerprint? Are you using the right key? See README.");
break;
default:
log_fn(LOG_WARN,"http status %d response unrecognized.", status_code);
break;
}
}
if(conn->purpose == DIR_PURPOSE_FETCH_RENDDESC) {
log_fn(LOG_INFO,"Received rendezvous descriptor (size %d, status code %d)",
body_len, status_code);
switch(status_code) {
case 200:
if(rend_cache_store(body, body_len) < 0) {
log_fn(LOG_WARN,"Failed to store rendezvous descriptor.");
/* alice's ap_stream will notice when connection_mark_for_close
* cleans it up */
} else {
/* success. notify pending connections about this. */
rend_client_desc_fetched(conn->rend_query, 1);
conn->purpose = DIR_PURPOSE_HAS_FETCHED_RENDDESC;
}
break;
case 404:
/* not there. pending connections will be notified when
* connection_mark_for_close cleans it up. */
break;
case 400:
log_fn(LOG_WARN,"http status 400 (bad request). Dirserver didn't like our rendezvous query?");
break;
}
}
if(conn->purpose == DIR_PURPOSE_UPLOAD_RENDDESC) {
switch(status_code) {
case 200:
log_fn(LOG_INFO,"eof (status 200) after uploading rendezvous descriptor: finished.");
break;
case 400:
log_fn(LOG_WARN,"http status 400 (bad request) response from dirserver. Malformed rendezvous descriptor?");
break;
default:
log_fn(LOG_WARN,"http status %d response unrecognized.", status_code);
break;
}
}
tor_free(body); tor_free(headers);
return 0;
}
/** Read handler for directory connections. (That's connections <em>to</em>
* directory servers and connections <em>at</em> directory servers.)
*/
int connection_dir_process_inbuf(connection_t *conn) {
int retval;
tor_assert(conn && conn->type == CONN_TYPE_DIR);
/* Directory clients write, then read data until they receive EOF;
* directory servers read data until they get an HTTP command, then
* write their response (when it's finished flushing, they mark for
* close).
*/
if(conn->inbuf_reached_eof) {
if(conn->state != DIR_CONN_STATE_CLIENT_READING) {
log_fn(LOG_INFO,"conn reached eof, not reading. Closing.");
connection_close_immediate(conn); /* it was an error; give up on flushing */
connection_mark_for_close(conn);
return -1;
}
retval = connection_dir_client_reached_eof(conn);
connection_mark_for_close(conn);
return retval;
} /* endif 'reached eof' */
/* If we're on the dirserver side, look for a command. */
if(conn->state == DIR_CONN_STATE_SERVER_COMMAND_WAIT) {
if (directory_handle_command(conn) < 0) {
connection_mark_for_close(conn);
return -1;
}
return 0;
}
/* 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;
}
static char answer200[] = "HTTP/1.0 200 OK\r\n\r\n";
static char answer400[] = "HTTP/1.0 400 Bad request\r\n\r\n";
static char answer403[] = "HTTP/1.0 403 Unapproved server\r\n\r\n";
static char answer404[] = "HTTP/1.0 404 Not found\r\n\r\n";
static char answer503[] = "HTTP/1.0 503 Directory unavailable\r\n\r\n";
/** Helper function: called when a dirserver gets a complete HTTP GET
* request. Look for a request for a directory or for a rendezvous
* service descriptor. On finding one, write a response into
* conn-\>outbuf. If the request is unrecognized, send a 400.
* Always return 0. */
static int
directory_handle_command_get(connection_t *conn, char *headers,
char *body, int body_len)
{
size_t dlen;
const char *cp;
char *url;
char tmp[8192];
char date[RFC1123_TIME_LEN+1];
log_fn(LOG_DEBUG,"Received GET command.");
conn->state = DIR_CONN_STATE_SERVER_WRITING;
if (parse_http_url(headers, &url) < 0) {
connection_write_to_buf(answer400, strlen(answer400), conn);
return 0;
}
log_fn(LOG_INFO,"rewritten url as '%s'.", url);
if(!strcmp(url,"/tor/") || !strcmp(url,"/tor/dir.z")) { /* directory fetch */
int deflated = !strcmp(url,"/tor/dir.z");
dlen = dirserv_get_directory(&cp, deflated);
tor_free(url);
if(dlen == 0) {
log_fn(LOG_WARN,"My directory is empty. Closing.");
connection_write_to_buf(answer503, strlen(answer503), conn);
return 0;
}
log_fn(LOG_DEBUG,"Dumping %sdirectory to client.",
deflated?"deflated ":"");
format_rfc1123_time(date, time(NULL));
snprintf(tmp, sizeof(tmp), "HTTP/1.0 200 OK\r\nDate: %s\r\nContent-Length: %d\r\nContent-Type: text/plain\r\nContent-Encoding: %s\r\n\r\n",
date,
(int)dlen,
deflated?"deflate":"identity");
connection_write_to_buf(tmp, strlen(tmp), conn);
connection_write_to_buf(cp, dlen, conn);
return 0;
}
if(!strcmp(url,"/tor/running-routers")) { /* running-routers fetch */
tor_free(url);
if(!authdir_mode()) {
/* XXX008 for now, we don't cache running-routers. Reject. */
connection_write_to_buf(answer400, strlen(answer400), conn);
return 0;
}
dlen = dirserv_get_runningrouters(&cp);
if(!dlen) { /* we failed to create cp */
connection_write_to_buf(answer503, strlen(answer503), conn);
return 0;
}
format_rfc1123_time(date, time(NULL));
snprintf(tmp, sizeof(tmp), "HTTP/1.0 200 OK\r\nDate: %s\r\nContent-Length: %d\r\nContent-Type: text/plain\r\n\r\n",
date,
(int)dlen);
connection_write_to_buf(tmp, strlen(tmp), conn);
connection_write_to_buf(cp, strlen(cp), conn);
return 0;
}
if(!strcmpstart(url,"/tor/rendezvous/")) {
/* rendezvous descriptor fetch */
const char *descp;
int desc_len;
if(!authdir_mode()) {
/* We don't hand out rend descs. In fact, it could be a security
* risk, since rend_cache_lookup_desc() below would provide it
* if we're gone to the site recently, and 404 if we haven't.
*
* Reject. */
connection_write_to_buf(answer400, strlen(answer400), conn);
tor_free(url);
return 0;
}
switch(rend_cache_lookup_desc(url+strlen("/tor/rendezvous/"), &descp, &desc_len)) {
case 1: /* valid */
format_rfc1123_time(date, time(NULL));
snprintf(tmp, sizeof(tmp), "HTTP/1.0 200 OK\r\nDate: %s\r\nContent-Length: %d\r\nContent-Type: application/octet-stream\r\n\r\n",
date,
desc_len); /* can't include descp here, because it's got nuls */
connection_write_to_buf(tmp, strlen(tmp), conn);
connection_write_to_buf(descp, desc_len, conn);
break;
case 0: /* well-formed but not present */
connection_write_to_buf(answer404, strlen(answer404), conn);
break;
case -1: /* not well-formed */
connection_write_to_buf(answer400, strlen(answer400), conn);
break;
}
tor_free(url);
return 0;
}
/* we didn't recognize the url */
connection_write_to_buf(answer404, strlen(answer404), conn);
tor_free(url);
return 0;
}
/** Helper function: called when a dirserver gets a complete HTTP POST
* request. Look for an uploaded server descriptor or rendezvous
* service descriptor. On finding one, process it and write a
* response into conn-\>outbuf. If the request is unrecognized, send a
* 400. Always return 0. */
static int
directory_handle_command_post(connection_t *conn, char *headers,
char *body, int body_len)
{
const char *cp;
char *url;
log_fn(LOG_DEBUG,"Received POST command.");
conn->state = DIR_CONN_STATE_SERVER_WRITING;
if(!authdir_mode()) {
/* we just provide cached directories; we don't want to
* receive anything. */
connection_write_to_buf(answer400, strlen(answer400), conn);
return 0;
}
if (parse_http_url(headers, &url) < 0) {
connection_write_to_buf(answer400, strlen(answer400), conn);
return 0;
}
log_fn(LOG_INFO,"rewritten url as '%s'.", url);
if(!strcmp(url,"/tor/")) { /* server descriptor post */
cp = body;
switch(dirserv_add_descriptor(&cp)) {
case -1:
/* malformed descriptor, or something wrong */
connection_write_to_buf(answer400, strlen(answer400), conn);
break;
case 0:
/* descriptor was well-formed but server has not been approved */
connection_write_to_buf(answer403, strlen(answer403), conn);
break;
case 1:
dirserv_get_directory(&cp, 0); /* rebuild and write to disk */
connection_write_to_buf(answer200, strlen(answer200), conn);
break;
}
tor_free(url);
return 0;
}
if(!strcmpstart(url,"/tor/rendezvous/publish")) {
/* rendezvous descriptor post */
if(rend_cache_store(body, body_len) < 0)
connection_write_to_buf(answer400, strlen(answer400), conn);
else
connection_write_to_buf(answer200, strlen(answer200), conn);
tor_free(url);
return 0;
}
/* we didn't recognize the url */
connection_write_to_buf(answer404, strlen(answer404), conn);
tor_free(url);
return 0;
}
/** Called when a dirserver receives data on a directory connection;
* looks for an HTTP request. If the request is complete, remove it
* from the inbuf, try to process it; otherwise, leave it on the
* buffer. Return a 0 on success, or -1 on error.
*/
static int directory_handle_command(connection_t *conn) {
char *headers=NULL, *body=NULL;
int body_len=0;
int r;
tor_assert(conn && conn->type == CONN_TYPE_DIR);
switch(fetch_from_buf_http(conn->inbuf,
&headers, MAX_HEADERS_SIZE,
&body, &body_len, MAX_BODY_SIZE)) {
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))
r = directory_handle_command_get(conn, headers, body, body_len);
else if (!strncasecmp(headers,"POST",4))
r = directory_handle_command_post(conn, headers, body, body_len);
else {
log_fn(LOG_WARN,"Got headers '%s' with unknown command. Closing.", headers);
r = -1;
}
tor_free(headers); tor_free(body);
return r;
}
/** Write handler for directory connections; called when all data has
* been flushed. Close the connection or wait for a response as
* appropriate.
*/
int connection_dir_finished_flushing(connection_t *conn) {
tor_assert(conn && conn->type == CONN_TYPE_DIR);
switch(conn->state) {
case DIR_CONN_STATE_CLIENT_SENDING:
log_fn(LOG_DEBUG,"client finished sending command.");
conn->state = DIR_CONN_STATE_CLIENT_READING;
connection_stop_writing(conn);
return 0;
case DIR_CONN_STATE_SERVER_WRITING:
log_fn(LOG_INFO,"Finished writing server response. Closing.");
connection_mark_for_close(conn);
return 0;
default:
log_fn(LOG_WARN,"BUG: called in unexpected state %d.", conn->state);
return -1;
}
return 0;
}
/** Connected handler for directory connections: begin sending data to the
* server */
int connection_dir_finished_connecting(connection_t *conn)
{
tor_assert(conn && conn->type == CONN_TYPE_DIR);
tor_assert(conn->state == DIR_CONN_STATE_CONNECTING);
log_fn(LOG_INFO,"Dir connection to router %s:%u established.",
conn->address,conn->port);
conn->state = DIR_CONN_STATE_CLIENT_SENDING; /* start flushing conn */
return 0;
}
/*
Local Variables:
mode:c
indent-tabs-mode:nil
c-basic-offset:2
End:
*/
|