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- /* Copyright 2001,2002,2003 Roger Dingledine. */
- /* See LICENSE for licensing information */
- /* $Id$ */
- #include "or.h"
- static int directory_send_command(connection_t *conn, int command);
- static int directory_handle_command(connection_t *conn);
- /********* START VARIABLES **********/
- extern or_options_t options; /* command-line and config-file options */
- extern int has_fetched_directory;
- #define MAX_HEADERS_SIZE 2048
- #define MAX_BODY_SIZE 500000
- /********* END VARIABLES ************/
- void directory_initiate_command(routerinfo_t *router, int command) {
- connection_t *conn;
- switch(command) {
- case DIR_CONN_STATE_CONNECTING_FETCH:
- log_fn(LOG_DEBUG,"initiating directory fetch");
- break;
- case DIR_CONN_STATE_CONNECTING_UPLOAD:
- log_fn(LOG_DEBUG,"initiating directory upload");
- break;
- }
- if (!router) { /* i guess they didn't have one in mind for me to use */
- log_fn(LOG_WARN,"No running dirservers known. Not trying.");
- return;
- }
- 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);
- assert(router->identity_pkey);
- conn->identity_pkey = crypto_pk_dup_key(router->identity_pkey);
- conn->state = command;
- 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_mark_for_close(conn, 0);
- 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. */
- return;
- /* case 1: fall through */
- }
- connection_set_poll_socket(conn);
- if(directory_send_command(conn, command) < 0) {
- connection_mark_for_close(conn, 0);
- }
- }
- static int directory_send_command(connection_t *conn, int command) {
- char fetchstring[] = "GET / HTTP/1.0\r\n\r\n";
- 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",
- (int)strlen(s), s);
- connection_write_to_buf(tmp, strlen(tmp), conn);
- conn->state = DIR_CONN_STATE_CLIENT_SENDING_UPLOAD;
- break;
- }
- return 0;
- }
- /* Parse "HTTP/1.%d %d%s\r\n".
- * If it's well-formed, assign *code, point *message to the first
- * non-space character after code if there is one and message is non-NULL
- * (else leave it alone), and return 0.
- * Otherwise, return -1.
- */
- int parse_http_response(char *headers, int *code, char **message) {
- int n1, n2;
- 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 */
- }
- return 0;
- }
- int connection_dir_process_inbuf(connection_t *conn) {
- char *directory;
- char *headers;
- int status_code;
- assert(conn && conn->type == CONN_TYPE_DIR);
- if(conn->inbuf_reached_eof) {
- if(conn->state != DIR_CONN_STATE_CLIENT_READING_FETCH &&
- conn->state != DIR_CONN_STATE_CLIENT_READING_UPLOAD) {
- 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,0);
- return -1;
- }
- switch(fetch_from_buf_http(conn->inbuf,
- &headers, MAX_HEADERS_SIZE,
- &directory, MAX_DIR_SIZE)) {
- case -1: /* overflow */
- log_fn(LOG_WARN,"'fetch' response too large. Failing.");
- connection_mark_for_close(conn,0);
- return -1;
- case 0:
- log_fn(LOG_INFO,"'fetch' response not all here, but we're at eof. Closing.");
- connection_mark_for_close(conn,0);
- return -1;
- /* case 1, fall through */
- }
- if(parse_http_response(headers, &status_code, NULL) < 0) {
- log_fn(LOG_WARN,"Unparseable headers. Closing.");
- free(directory); free(headers);
- connection_mark_for_close(conn,0);
- return -1;
- }
- if(conn->state == DIR_CONN_STATE_CLIENT_READING_FETCH) {
- /* fetch/process the directory to learn about new routers. */
- int directorylen;
- directorylen = strlen(directory);
- log_fn(LOG_INFO,"Received directory (size %d):\n%s", directorylen, directory);
- if(status_code == 503 || directorylen == 0) {
- log_fn(LOG_INFO,"Empty directory. Ignoring.");
- free(directory); free(headers);
- connection_mark_for_close(conn,0);
- return 0;
- }
- if(status_code != 200) {
- log_fn(LOG_WARN,"Received http status code %d from dirserver. Failing.",
- status_code);
- free(directory); free(headers);
- connection_mark_for_close(conn,0);
- return -1;
- }
- if(router_set_routerlist_from_directory(directory, conn->identity_pkey) < 0){
- log_fn(LOG_INFO,"...but parsing failed. Ignoring.");
- } else {
- log_fn(LOG_INFO,"updated routers.");
- }
- has_fetched_directory=1;
- if(options.ORPort) { /* connect to them all */
- router_retry_connections();
- }
- free(directory); free(headers);
- connection_mark_for_close(conn,0);
- return 0;
- }
- if(conn->state == DIR_CONN_STATE_CLIENT_READING_UPLOAD) {
- switch(status_code) {
- case 200:
- log_fn(LOG_INFO,"eof (status 200) while reading upload response: finished.");
- break;
- case 400:
- log_fn(LOG_WARN,"http status 400 (bad request) response from dirserver.");
- break;
- case 403:
- log_fn(LOG_WARN,"http status 403 (unapproved server) response from dirserver. Is your clock skewed? Have you mailed arma your identity fingerprint? Are you using the right key?");
- break;
- }
- free(directory); free(headers);
- connection_mark_for_close(conn,0);
- return 0;
- }
- }
- 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;
- }
- 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 answer503[] = "HTTP/1.0 503 Directory unavailable\r\n\r\n";
- static int directory_handle_command_get(connection_t *conn,
- char *headers, char *body) {
- size_t dlen;
- const char *cp;
- /* XXX should check url and http version */
- log_fn(LOG_DEBUG,"Received GET command.");
- dlen = dirserv_get_directory(&cp);
- if(dlen == 0) {
- log_fn(LOG_WARN,"My directory is empty. Closing.");
- connection_write_to_buf(answer503, strlen(answer503), conn);
- conn->state = DIR_CONN_STATE_SERVER_WRITING;
- return 0;
- }
- log_fn(LOG_DEBUG,"Dumping directory to client.");
- connection_write_to_buf(answer200, strlen(answer200), conn);
- connection_write_to_buf(cp, dlen, conn);
- conn->state = DIR_CONN_STATE_SERVER_WRITING;
- return 0;
- }
- static int directory_handle_command_post(connection_t *conn,
- char *headers, char *body) {
- const char *cp;
- /* XXX should check url and http version */
- log_fn(LOG_DEBUG,"Received POST command.");
- 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); /* rebuild and write to disk */
- connection_write_to_buf(answer200, strlen(answer200), conn);
- break;
- }
- conn->state = DIR_CONN_STATE_SERVER_WRITING;
- return 0;
- }
- static int directory_handle_command(connection_t *conn) {
- char *headers=NULL, *body=NULL;
- int r;
- assert(conn && conn->type == CONN_TYPE_DIR);
- switch(fetch_from_buf_http(conn->inbuf,
- &headers, MAX_HEADERS_SIZE, &body, 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);
- else if (!strncasecmp(headers,"POST",4))
- r = directory_handle_command_post(conn, headers, body);
- else {
- log_fn(LOG_WARN,"Got headers '%s' with unknown command. Closing.", headers);
- r = -1;
- }
- tor_free(headers); tor_free(body);
- return r;
- }
- 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 */
- connection_mark_for_close(conn,0);
- 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.");
- connection_mark_for_close(conn,0);
- return 0;
- default:
- log_fn(LOG_WARN,"BUG: called in unexpected state %d.", conn->state);
- return -1;
- }
- return 0;
- }
- /*
- Local Variables:
- mode:c
- indent-tabs-mode:nil
- c-basic-offset:2
- End:
- */
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