tor/src/or/directory.c

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/* Copyright 2001,2002 Roger Dingledine, Matej Pfajfar. */
/* See LICENSE for licensing information */
/* $Id$ */
#include "or.h"
#define MAX_DIR_SIZE 50000 /* XXX, big enough? */
/********* START VARIABLES **********/
extern or_options_t options; /* command-line and config-file options */
static char the_directory[MAX_DIR_SIZE+1];
static int directorylen=0;
static int reading_headers=0;
static int directory_dirty=1;
static char getstring[] = "GET / HTTP/1.0\r\n\r\n";
static char answerstring[] = "HTTP/1.0 200 OK\r\n\r\n";
/********* END VARIABLES ************/
void directory_initiate_fetch(routerinfo_t *router) {
connection_t *conn;
struct sockaddr_in router_addr;
int s;
if(!router) /* i guess they didn't have one in mind for me to use */
return;
if(connection_get_by_type(CONN_TYPE_DIR)) /* there's already a fetch running */
return;
log_fn(LOG_DEBUG,"initiating directory fetch");
conn = connection_new(CONN_TYPE_DIR);
if(!conn)
return;
/* 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 = strdup(router->address);
conn->receiver_bucket = -1; /* edge connections don't do receiver buckets */
conn->bandwidth = -1;
if (router->signing_pkey)
conn->pkey = crypto_pk_dup_key(router->signing_pkey);
else {
log_fn(LOG_ERR, "No signing key known for directory %s; signature won't be checked", conn->address);
conn->pkey = NULL;
}
s=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
if(s < 0) {
log_fn(LOG_ERR,"Error creating network socket.");
connection_free(conn);
return;
}
set_socket_nonblocking(s);
memset((void *)&router_addr,0,sizeof(router_addr));
router_addr.sin_family = AF_INET;
router_addr.sin_port = htons(router->dir_port);
router_addr.sin_addr.s_addr = htonl(router->addr);
log_fn(LOG_DEBUG,"Trying to connect to %s:%u.",router->address,router->dir_port);
if(connect(s,(struct sockaddr *)&router_addr,sizeof(router_addr)) < 0){
if(errno != EINPROGRESS){
/* yuck. kill it. */
router_forget_router(conn->addr, conn->port); /* don't try him again */
connection_free(conn);
return;
} else {
/* it's in progress. set state appropriately and return. */
conn->s = s;
if(connection_add(conn) < 0) { /* no space, forget it */
connection_free(conn);
return;
}
log_fn(LOG_DEBUG,"connect in progress.");
connection_watch_events(conn, POLLIN | POLLOUT); /* writable indicates finish, readable indicates broken link */
conn->state = DIR_CONN_STATE_CONNECTING;
return;
}
}
/* it succeeded. we're connected. */
conn->s = s;
if(connection_add(conn) < 0) { /* no space, forget it */
connection_free(conn);
return;
}
log_fn(LOG_DEBUG,"Connection to router %s:%u established.",router->address,router->dir_port);
if(directory_send_command(conn) < 0) {
connection_remove(conn);
connection_free(conn);
}
}
int directory_send_command(connection_t *conn) {
assert(conn && conn->type == CONN_TYPE_DIR);
if(connection_write_to_buf(getstring, strlen(getstring), conn) < 0) {
log_fn(LOG_DEBUG,"Couldn't write command to buffer.");
return -1;
}
conn->state = DIR_CONN_STATE_SENDING_COMMAND;
return 0;
}
void directory_set_dirty(void) {
directory_dirty = 1;
}
void directory_rebuild(void) {
if(directory_dirty) {
if (dump_signed_directory_to_string(the_directory, MAX_DIR_SIZE,
get_signing_privatekey())) {
log(LOG_ERR, "Error writing directory");
return;
}
log(LOG_INFO,"New directory:\n%s",the_directory);
directorylen = strlen(the_directory);
directory_dirty = 0;
} else {
log(LOG_INFO,"Directory still clean, reusing.");
}
}
int connection_dir_process_inbuf(connection_t *conn) {
assert(conn && conn->type == CONN_TYPE_DIR);
if(conn->inbuf_reached_eof) {
if(conn->state != DIR_CONN_STATE_READING) {
log_fn(LOG_DEBUG,"conn reached eof, not reading. Closing.");
return -1;
}
/* eof reached, kill it, but first process the_directory and learn about new routers. */
log_fn(LOG_DEBUG,"Received directory (size %d)\n%s", directorylen, the_directory);
if(directorylen == 0) {
log_fn(LOG_DEBUG,"Empty directory. Ignoring.");
return -1;
}
if(router_get_dir_from_string(the_directory, conn->pkey) < 0) {
log_fn(LOG_DEBUG,"...but parsing failed. Ignoring.");
} else {
log_fn(LOG_DEBUG,"and got a %s directory; updated routers.",
conn->pkey ? "authenticated" : "unauthenticated");
}
if(options.OnionRouter) { /* connect to them all */
router_retry_connections();
}
return -1;
}
switch(conn->state) {
case DIR_CONN_STATE_COMMAND_WAIT:
return directory_handle_command(conn);
case DIR_CONN_STATE_READING:
return directory_handle_reading(conn);
default:
log_fn(LOG_DEBUG,"Got data while writing; Ignoring.");
break;
}
return 0;
}
int directory_handle_command(connection_t *conn) {
char buf[15];
assert(conn && conn->type == CONN_TYPE_DIR);
if(conn->inbuf_datalen < strlen(getstring)) { /* entire response available? */
log_fn(LOG_DEBUG,"Entire command not here yet. Waiting.");
return 0; /* not yet */
}
connection_fetch_from_buf(buf,strlen(getstring),conn);
if(strncasecmp(buf,getstring,strlen("GET / HTTP/"))) {
log_fn(LOG_DEBUG,"Command doesn't seem to be a get. Closing,");
return -1;
}
directory_rebuild(); /* rebuild it now, iff it's dirty */
if(directorylen == 0) {
log_fn(LOG_DEBUG,"My directory is empty. Closing.");
return -1;
}
log_fn(LOG_DEBUG,"Dumping directory to client.");
if((connection_write_to_buf(answerstring, strlen(answerstring), conn) < 0) ||
(connection_write_to_buf(the_directory, directorylen, conn) < 0)) {
log_fn(LOG_DEBUG,"my outbuf is full. Oops.");
return -1;
}
conn->state = DIR_CONN_STATE_WRITING;
return 0;
}
int directory_handle_reading(connection_t *conn) {
int amt;
char *headers;
assert(conn && conn->type == CONN_TYPE_DIR);
if(reading_headers) {
amt = connection_find_on_inbuf("\r\n\r\n", 4, conn);
if(amt < 0) /* not there yet */
return 0;
headers = tor_malloc(amt+1);
connection_fetch_from_buf(headers,amt,conn);
headers[amt] = 0; /* null terminate it, */
free(headers); /* and then throw it away */
reading_headers = 0;
}
amt = conn->inbuf_datalen;
if(amt + directorylen >= MAX_DIR_SIZE) {
log_fn(LOG_DEBUG,"Directory too large. Failing messily.");
return -1;
}
log_fn(LOG_DEBUG,"Pulling %d bytes in at offset %d.",
amt, directorylen);
connection_fetch_from_buf(the_directory+directorylen,amt,conn);
directorylen += amt;
the_directory[directorylen] = 0;
return 0;
}
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:
if (getsockopt(conn->s, SOL_SOCKET, SO_ERROR, (void*)&e, &len) < 0) { /* not yet */
if(errno != EINPROGRESS){
/* yuck. kill it. */
log_fn(LOG_DEBUG,"in-progress connect failed. Removing.");
router_forget_router(conn->addr, conn->port); /* 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_DEBUG,"Dir connection to router %s:%u established.",
conn->address,conn->port);
return directory_send_command(conn);
case DIR_CONN_STATE_SENDING_COMMAND:
log_fn(LOG_DEBUG,"client finished sending command.");
directorylen = 0;
reading_headers = 1;
conn->state = DIR_CONN_STATE_READING;
connection_watch_events(conn, POLLIN);
return 0;
case DIR_CONN_STATE_WRITING:
log_fn(LOG_DEBUG,"Finished writing directory. Closing.");
return -1; /* kill it */
default:
log_fn(LOG_DEBUG,"BUG: called in unexpected state.");
return 0;
}
return 0;
}
int connection_dir_create_listener(struct sockaddr_in *bindaddr) {
log_fn(LOG_DEBUG,"starting");
return connection_create_listener(bindaddr, CONN_TYPE_DIR_LISTENER);
}
int connection_dir_handle_listener_read(connection_t *conn) {
log(LOG_INFO,"Dir: Received a connection request. Waiting for command.");
return connection_handle_listener_read(conn, CONN_TYPE_DIR, DIR_CONN_STATE_COMMAND_WAIT);
}
/*
Local Variables:
mode:c
indent-tabs-mode:nil
c-basic-offset:2
End:
*/