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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 char getstring[] = "GET / HTTP/1.0\n\r";
/********* END VARIABLES ************/
void directory_initiate_fetch(routerinfo_t *router) {
connection_t *conn;
struct sockaddr_in router_addr;
int s;
log(LOG_DEBUG,"directory_initiate_fetch(): initiating directory fetch");
if(!router) /* i guess they didn't have one in mind for me to use */
return;
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->or_port; /* NOTE we store or_port here always */
conn->address = strdup(router->address);
conn->receiver_bucket = -1; /* edge connections don't do receiver buckets */
conn->bandwidth = -1;
s=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
if (s < 0)
{
log(LOG_ERR,"directory_initiate_fetch(): Error creating network socket.");
connection_free(conn);
return;
}
fcntl(s, F_SETFL, O_NONBLOCK); /* set s to non-blocking */
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 = router->addr;
log(LOG_DEBUG,"directory_initiate_fetch(): Trying to connect to %s:%u.",inet_ntoa(*(struct in_addr *)&router->addr),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(LOG_DEBUG,"directory_initiate_fetch(): 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(LOG_DEBUG,"directory_initiate_fetch(): 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(LOG_DEBUG,"directory_send_command(): Couldn't write command to buffer.");
return -1;
}
conn->state = DIR_CONN_STATE_SENDING_COMMAND;
return 0;
}
void directory_rebuild(void) {
dump_directory_to_string(the_directory, MAX_DIR_SIZE);
log(LOG_DEBUG,"New directory:\n'%s'",the_directory);
directorylen = strlen(the_directory);
}
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(LOG_DEBUG,"connection_dir_process_inbuf(): conn reached eof, not reading. Closing.");
return -1;
}
/* eof reached, kill it, but first process the_directory and learn about new routers. */
// log(LOG_DEBUG,"connection_dir_process_inbuf(): conn reached eof. Processing directory.");
log(LOG_DEBUG,"connection_dir_process_inbuf(): Received directory (size %d)\n%s", directorylen, the_directory);
if(directorylen == 0) {
log(LOG_DEBUG,"connection_dir_process_inbuf(): Empty directory. Ignoring.");
return -1;
}
if(router_get_list_from_string(the_directory, options.ORPort) < 0) {
log(LOG_DEBUG,"connection_dir_process_inbuf(): ...but parsing failed. Ignoring.");
}
if(options.Role & ROLE_OR_CONNECT_ALL) { /* connect to them all */
struct sockaddr_in local; /* local address */
if(learn_local(&local) < 0)
return -1;
local.sin_port = htons(options.ORPort);
router_retry_connections(&local);
}
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(LOG_DEBUG,"connection_dir_process_inbuf(): Got data while writing; Ignoring.");
break;
}
return 0;
}
int directory_handle_command(connection_t *conn) {
assert(conn && conn->type == CONN_TYPE_DIR);
if(conn->inbuf_datalen < strlen(getstring)) { /* entire response available? */
log(LOG_DEBUG,"directory_handle_command(): Entire command not here yet. Waiting.");
return 0; /* not yet */
}
/* for now, don't bother reading it. */
if(directorylen == 0) {
log(LOG_DEBUG,"directory_handle_command(): My directory is empty. Closing.");
return -1;
}
log(LOG_DEBUG,"directory_handle_command(): Dumping directory to client.");
if(connection_write_to_buf(the_directory, directorylen, conn) < 0) {
log(LOG_DEBUG,"directory_handle_command(): my outbuf is full. Oops.");
return -1;
}
conn->state = DIR_CONN_STATE_WRITING;
return 0;
}
int directory_handle_reading(connection_t *conn) {
int amt;
assert(conn && conn->type == CONN_TYPE_DIR);
amt = conn->inbuf_datalen;
if(amt + directorylen >= MAX_DIR_SIZE) {
log(LOG_DEBUG,"directory_handle_reading(): Directory too large. Failing messily.");
return -1;
}
log(LOG_DEBUG,"directory_handle_reading(): Pulling %d bytes in at offset %d.",
amt, directorylen);
if(connection_fetch_from_buf(the_directory+directorylen,amt,conn) < 0) {
log(LOG_DEBUG,"directory_handle_reading(): fetch_from_buf failed.");
return -1;
}
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, &e, &len) < 0) { /* not yet */
if(errno != EINPROGRESS){
/* yuck. kill it. */
log(LOG_DEBUG,"connection_dir_finished_flushing(): 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(LOG_DEBUG,"connection_dir_finished_flushing(): Dir connection to router %s:%u established.",
conn->address,conn->port);
return directory_send_command(conn);
case DIR_CONN_STATE_SENDING_COMMAND:
log(LOG_DEBUG,"connection_dir_finished_flushing(): client finished sending command.");
directorylen = 0;
conn->state = DIR_CONN_STATE_READING;
connection_watch_events(conn, POLLIN);
return 0;
case DIR_CONN_STATE_WRITING:
log(LOG_DEBUG,"connection_dir_finished_flushing(): Finished writing directory. Closing.");
return -1; /* kill it */
default:
log(LOG_DEBUG,"Bug: connection_dir_finished_flushing() called in unexpected state.");
return 0;
}
return 0;
}
int connection_dir_create_listener(struct sockaddr_in *local) {
log(LOG_DEBUG,"connection_create_dir_listener starting");
return connection_create_listener(local, CONN_TYPE_DIR_LISTENER);
}
int connection_dir_handle_listener_read(connection_t *conn) {
log(LOG_NOTICE,"Dir: Received a connection request. Waiting for command.");
return connection_handle_listener_read(conn, CONN_TYPE_DIR, DIR_CONN_STATE_COMMAND_WAIT);
}
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