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/* Gopher protocol routines
Copyright (C) 2002 James A. Morrison <ja2morri@uwaterloo.ca>
Copyright (C) 2000 Igor Khavkine <igor@twu.net>
This file is part of Gopherfs.
Gopherfs is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
Gopherfs is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <stdio.h>
#include <error.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "gopherfs.h"
#include <hurd/hurd_types.h>
#include <hurd/netfs.h>
/* do a DNS lookup for NAME and store result in *ENT */
error_t
lookup_host (char *name, struct hostent **ent)
{
error_t err;
struct hostent hentbuf;
int herr = 0;
char *tmpbuf;
size_t tmpbuflen = 512;
tmpbuf = (char *) malloc (tmpbuflen);
if (!tmpbuf)
return ENOMEM;
/* XXX: use getaddrinfo */
while ((err = gethostbyname_r (name, &hentbuf, tmpbuf,
tmpbuflen, ent, &herr)) == ERANGE)
{
tmpbuflen *= 2;
tmpbuf = (char *) realloc (tmpbuf, tmpbuflen);
if (!tmpbuf)
return ENOMEM;
}
free (tmpbuf);
if (!herr)
return EINVAL;
return 0;
}
/* store the remote socket in *FD after writing a gopher selector
to it */
error_t
open_selector (struct netnode * node, int *fd)
{
error_t err;
struct hostent *server_ent;
struct sockaddr_in server;
ssize_t written;
size_t towrite;
err = lookup_host (node->server, &server_ent);
if (!err)
return err;
if (debug_flag)
fprintf (stderr, "trying to open %s:%d/%s\n", node->server,
node->port, node->selector);
server.sin_family = AF_INET;
server.sin_port = htons (node->port);
server.sin_addr = *(struct in_addr *) server_ent->h_addr;
*fd = socket (PF_INET, SOCK_STREAM, 0);
if (*fd == -1)
return errno;
err = connect (*fd, (struct sockaddr *) &server, sizeof (server));
if (err == -1)
return errno;
towrite = strlen (node->selector);
/* guard against EINTR failures */
written = TEMP_FAILURE_RETRY (write (*fd, node->selector, towrite));
written += TEMP_FAILURE_RETRY (write (*fd, "\r\n", 2));
if (written == -1 || written < (towrite + 2))
return errno;
return 0;
}
/* fetch a directory node from the gopher server
DIR should already be locked */
error_t
fill_dirnode (struct netnode * dir)
{
error_t err = 0;
FILE *sel;
int sel_fd;
char *line;
size_t line_len;
struct node *nd, **prevp;
err = open_selector (dir, &sel_fd);
if (err)
return err;
if (debug_flag)
fprintf (stderr, "filling out dir %s\n", dir->name);
errno = 0;
sel = fdopen (sel_fd, "r");
if (!sel)
{
close (sel_fd);
return errno;
}
dir->noents = TRUE;
dir->num_ents = 0;
prevp = &dir->ents;
line = NULL;
line_len = 0;
while (getline (&line, &line_len, sel) >= 0)
{
char type, *name, *selector, *server;
unsigned short port;
char *tok, *endtok;
if (debug_flag)
fprintf (stderr, "%s\n", line);
if (*line == '.' || err)
break;
/* parse the gopher node description */
type = *line;
endtok = line + 1;
name = strsep (&endtok, "\t");
selector = strsep (&endtok, "\t");
server = strsep (&endtok, "\t");
port = (unsigned short) atoi (strsep (&endtok, "\t"));
nd = gopherfs_make_node (type, name, selector, server, port);
if (!nd)
{
err = ENOMEM;
break;
}
*prevp = nd;
nd->prevp = prevp;
prevp = &nd->next;
dir->num_ents++;
if (dir->noents)
dir->noents = FALSE;
}
free (line);
if (err)
{
fclose (sel);
return err;
}
return 0;
}
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