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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 <arpa/inet.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:PORT and store results in ENT and error in H_ERR */
error_t
lookup_host (char *name, unsigned short port, struct addrinfo **ai)
{
/* XXX: cache host lookups. */
struct addrinfo hints;
char *service;
error_t err;
memset (&hints, 0, sizeof(hints));
hints.ai_family = PF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_IP;
hints.ai_flags = AI_NUMERICSERV;
err = asprintf (&service, "%hu", port);
if (err == -1)
return ENOMEM;
err = getaddrinfo (name, service, &hints, ai);
free (service);
return err;
}
/* open ENTRY and store the remote socket in *FD */
error_t
gopher_open (struct gopher_entry *entry, int *fd)
{
struct addrinfo *addr;
error_t err;
ssize_t written;
size_t towrite;
*fd = socket (PF_INET, SOCK_STREAM, 0);
if (*fd < 0)
{
debug ("failed to open socket (errno: %s)", strerror(errno));
return errno;
}
err = lookup_host (entry->server, entry->port, &addr);
if (err)
{
debug ("looking up host failed: %s", gai_strerror(err));
return err;
}
/* XXX: cache host lookups. */
do
{
debug ("connecting to %s:%hu...",
inet_ntoa(((struct sockaddr_in *)addr->ai_addr)->sin_addr),
ntohs(((struct sockaddr_in *)addr->ai_addr)->sin_port));
err = connect (*fd, (struct sockaddr_in *) addr->ai_addr, addr->ai_addrlen);
if (err)
debug ("connect() failed! errno: %s", strerror(errno));
addr = addr->ai_next;
}
while (addr && err);
freeaddrinfo(addr);
if (err)
{
close (*fd);
return errno;
}
/* Write selector to *FD. */
towrite = strlen (entry->selector);
/* guard against EINTR failures */
written = TEMP_FAILURE_RETRY (write (*fd, entry->selector, towrite));
written += TEMP_FAILURE_RETRY (write (*fd, "\r\n", 2));
if (written == -1 || written < (towrite + 2))
return errno;
return 0;
}
/* List all entries from ENTRY and store them in *MAP. */
error_t
gopher_list_entries (struct gopher_entry *entry, struct gopher_entry **map)
{
FILE *sel;
char *line = NULL;
size_t line_len = 0;
struct gopher_entry *prev = NULL;
error_t err = 0;
{
int fd;
err = gopher_open (entry, &fd);
if (err)
return err;
sel = fdopen (fd, "r");
if (!sel)
{
close (fd);
return errno;
}
}
while (getline (&line, &line_len, sel) >= 0)
{
/* Parse gopher entry. */
struct gopher_entry *cur;
char *tmp;
debug ("%s", line);
if (*line == '.' || err)
break;
cur = malloc (sizeof (struct gopher_entry));
if (!cur)
{
err = ENOMEM;
break;
}
cur->type = line[0];
tmp = line + 1;
cur->name = strdup(strsep (&tmp, "\t"));
cur->selector = strdup(strsep (&tmp, "\t"));
cur->server = strdup(strsep (&tmp, "\t"));
cur->port = (unsigned short) atoi (strsep (&tmp, "\t"));
if (!*map)
/* First item. */
*map = cur;
else
prev->next = cur;
cur->prev = prev;
cur->next = NULL;
prev = cur;
}
free (line);
fclose (sel);
return err;
}
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