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/* ident.c,v 1.8 2004/06/17 01:27:40 eagle Exp
**
** High-level interface to the ident library.
**
** Written by Pdr Emanuelsson <pell@lysator.liu.se>
** With modifications by Peter Eriksson <pen@lysator.liu.se>
*/
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
/* BSDI needs <netinet/in.h> before <arpa/inet.h>. */
#include <netinet/in.h>
#include <arpa/inet.h>
#include "sident.h"
#define MAX_PORT 65536
#define VALID_PORT(port) ((port) > 1 && (port) < MAX_PORT)
extern void id_auth_free();
/*
** Do a complete ident query and return the result as an IDENT struct.
** Assumes that the client to query is whatever client is attached to the
** provided file descriptor. The timeout is given in seconds.
*/
IDENT *
ident_lookup(int fd, int timeout)
{
struct sockaddr_in localaddr, remoteaddr;
int len;
len = sizeof(remoteaddr);
if (getpeername(fd, (struct sockaddr *) &remoteaddr, &len) < 0)
return 0;
len = sizeof(localaddr);
if (getsockname(fd, (struct sockaddr *) &localaddr, &len) < 0)
return 0;
return ident_query(&localaddr.sin_addr, &remoteaddr.sin_addr,
(int) ntohs(remoteaddr.sin_port),
(int) ntohs(localaddr.sin_port), timeout);
}
/*
** Same as ident_lookup, but takes the local address and port and the remote
** address and port. This function can be run by a process completely
** unrelated to the one to which the client is connected, if need be.
*/
IDENT *
ident_query(struct in_addr *laddr, struct in_addr *raddr,
int resp_port, int req_port, int timeout)
{
int res;
ident_t *id;
struct timeval timout;
IDENT *ident = NULL;
struct ident_auth_client_data *auth_data;
char tmp[IDENT_BUFFER_SIZE];
/* Do some sanity checks on the args */
if (!VALID_PORT(resp_port) || !VALID_PORT(req_port) || timeout < 0) {
errno = EINVAL;
return NULL;
}
timout.tv_sec = timeout;
timout.tv_usec = 0;
auth_data = id_auth_init(NULL);
auth_data->local_addr = laddr;
auth_data->remote_addr = raddr;
if (timeout > 0)
id = id_open(laddr, raddr, &timout);
else
id = id_open(laddr, raddr, NULL);
if (id == NULL) {
errno = EINVAL;
return NULL;
}
if (timeout)
res = id_query(id, resp_port, req_port, &timout, auth_data);
else
res = id_query(id, resp_port, req_port, NULL, auth_data);
if (res < 0) {
id_auth_free(auth_data);
id_close(id);
return NULL;
}
ident = malloc(sizeof(IDENT));
if (ident == NULL) {
id_auth_free(auth_data);
id_close(id);
return NULL;
}
if (timeout)
res = id_parse(id, &timout, &ident->resp_port, &ident->req_port,
&ident->identifier, &ident->opsys, &ident->charset,
auth_data);
else
res = id_parse(id, NULL, &ident->resp_port, &ident->req_port,
&ident->identifier, &ident->opsys, &ident->charset,
auth_data);
/* Copy over the principal, if any, first, since this is another memory
allocation that could potentially fail and change the result code. */
if (auth_data->user_principal != NULL) {
ident->principal = strdup(auth_data->user_principal);
if (ident->principal == NULL)
res = IDENT_SYSTEM_ERROR;
}
/* Check to see if we succeeded. If we didn't, cobble up an error reply
to stuff into the identifier field. */
if (res != IDENT_AUTH_OKAY) {
if (ident->identifier == NULL)
sprintf(tmp, "%s:NULL", ident_err_txt[res]);
else {
sprintf(tmp, "%s:%s", ident_err_txt[res], ident->identifier);
free(ident->identifier);
}
ident->identifier = strdup(tmp);
}
/* Success. Set the rest of the ident struct, free our internal
structures, and return. */
ident->result_code = res;
ident->expires = auth_data->expires;
id_auth_free(auth_data);
id_close(id);
return ident;
}
/*
** The simplest of the lookup calls. Assumes that fd points to an open
** network connection and does an ident callback to the system on the other
** end, asking for the identity of the user opening that connection. Returns
** only the identity string in newly allocated memory. timeout specifies the
** timout in seconds. If the protocol failed or the user could not be
** authenticated, returns NULL.
*/
char *
ident_id(int fd, int timeout)
{
IDENT *ident;
char *id = NULL;
ident = ident_lookup(fd, timeout);
if (ident == NULL)
return NULL;
if (ident->identifier == NULL || *ident->identifier == '\0') {
ident_free(ident);
return NULL;
}
if (ident->result_code != IDENT_AUTH_OKAY) {
ident_free(ident);
return NULL;
}
id = strdup(ident->identifier);
ident_free(ident);
return id;
}
/*
** Free an IDENT struct and all of the allocated memory that it points to.
*/
void
ident_free(IDENT *id)
{
if (id == NULL)
return;
if (id->identifier != NULL)
free(id->identifier);
if (id->opsys != NULL)
free(id->opsys);
if (id->charset != NULL)
free(id->charset);
free(id);
}
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