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/*-
* The code in this file was written by Eivind Eklund <perhaps@yes.no>,
* who places it in the public domain without restriction.
*
* $Id: alias_cmd.c,v 1.4 1997/12/24 10:28:15 brian Exp $
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "defs.h"
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "loadalias.h"
#include "vars.h"
#include "alias_cmd.h"
static int StrToAddr(const char *, struct in_addr *);
static int StrToPort(const char *, u_short *, const char *);
static int StrToAddrAndPort(const char *, struct in_addr *, u_short *, const char *);
int
AliasRedirectPort(struct cmdargs const *arg)
{
if (!(mode & MODE_ALIAS)) {
if (VarTerm)
fprintf(VarTerm, "Alias not enabled\n");
return 1;
} else if (arg->argc == 3) {
char proto_constant;
const char *proto;
u_short local_port;
u_short alias_port;
int error;
struct in_addr local_addr;
struct in_addr null_addr;
struct alias_link *link;
proto = arg->argv[0];
if (strcmp(proto, "tcp") == 0) {
proto_constant = IPPROTO_TCP;
} else if (strcmp(proto, "udp") == 0) {
proto_constant = IPPROTO_UDP;
} else {
if (VarTerm) {
fprintf(VarTerm, "port redirect: protocol must be tcp or udp\n");
fprintf(VarTerm, "Usage: alias %s %s\n", arg->cmd->name,
arg->cmd->syntax);
}
return 1;
}
error = StrToAddrAndPort(arg->argv[1], &local_addr, &local_port, proto);
if (error) {
if (VarTerm) {
fprintf(VarTerm, "port redirect: error reading local addr:port\n");
fprintf(VarTerm, "Usage: alias %s %s\n", arg->cmd->name, arg->cmd->syntax);
}
return 1;
}
error = StrToPort(arg->argv[2], &alias_port, proto);
if (error) {
if (VarTerm) {
fprintf(VarTerm, "port redirect: error reading alias port\n");
fprintf(VarTerm, "Usage: alias %s %s\n", arg->cmd->name, arg->cmd->syntax);
}
return 1;
}
null_addr.s_addr = 0;
link = VarPacketAliasRedirectPort(local_addr, local_port,
null_addr, 0,
null_addr, alias_port,
proto_constant);
if (link == NULL && VarTerm)
fprintf(VarTerm, "port redirect: error returned by packed"
" aliasing engine (code=%d)\n", error);
} else
return -1;
return 0;
}
int
AliasRedirectAddr(struct cmdargs const *arg)
{
if (!(mode & MODE_ALIAS)) {
if (VarTerm)
fprintf(VarTerm, "alias not enabled\n");
return 1;
} else if (arg->argc == 2) {
int error;
struct in_addr local_addr;
struct in_addr alias_addr;
struct alias_link *link;
error = StrToAddr(arg->argv[0], &local_addr);
if (error) {
if (VarTerm)
fprintf(VarTerm, "address redirect: invalid local address\n");
return 1;
}
error = StrToAddr(arg->argv[1], &alias_addr);
if (error) {
if (VarTerm) {
fprintf(VarTerm, "address redirect: invalid alias address\n");
fprintf(VarTerm, "Usage: alias %s %s\n", arg->cmd->name, arg->cmd->syntax);
}
return 1;
}
link = VarPacketAliasRedirectAddr(local_addr, alias_addr);
if (link == NULL && VarTerm) {
fprintf(VarTerm, "address redirect: packet aliasing engine error\n");
fprintf(VarTerm, "Usage: alias %s %s\n", arg->cmd->name, arg->cmd->syntax);
}
} else
return -1;
return 0;
}
static int
StrToAddr(const char *str, struct in_addr *addr)
{
struct hostent *hp;
if (inet_aton(str, addr))
return 0;
hp = gethostbyname(str);
if (!hp) {
LogPrintf(LogWARN, "StrToAddr: Unknown host %s.\n", str);
return -1;
}
*addr = *((struct in_addr *) hp->h_addr);
return 0;
}
static int
StrToPort(const char *str, u_short *port, const char *proto)
{
int iport;
struct servent *sp;
char *end;
iport = strtol(str, &end, 10);
if (end != str) {
*port = htons(iport);
return 0;
}
sp = getservbyname(str, proto);
if (!sp) {
LogPrintf(LogWARN, "StrToAddr: Unknown port or service %s/%s.\n",
str, proto);
return -1;
}
*port = sp->s_port;
return 0;
}
static int
StrToAddrAndPort(const char *str, struct in_addr *addr, u_short *port, const char *proto)
{
char *colon;
int res;
colon = strchr(str, ':');
if (!colon) {
LogPrintf(LogWARN, "StrToAddrAndPort: %s is missing port number.\n", str);
return -1;
}
*colon = '\0'; /* Cheat the const-ness ! */
res = StrToAddr(str, addr);
*colon = ':'; /* Cheat the const-ness ! */
if (res != 0)
return -1;
return StrToPort(colon+1, port, proto);
}
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