1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
#include <limits.h>
#include <netdb.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "defs.h"
#include "command.h"
#include "loadalias.h"
#include "vars.h"
static int
StrToAddr(char *, struct in_addr * addr);
static int
StrToPort(char *, u_short * port, char *proto);
static int
StrToAddrAndPort(char *, struct in_addr * addr, u_short * port, char *proto);
int
AliasRedirectPort(struct cmdtab * list,
int argc,
char **argv,
void *param)
{
if (!(mode & MODE_ALIAS)) {
if (VarTerm)
fprintf(VarTerm, "Alias not enabled\n");
} else if (argc == 3) {
char proto_constant;
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 = 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", list->name,
list->syntax);
}
return 1;
}
error = StrToAddrAndPort(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", list->name, list->syntax);
}
return 1;
}
error = StrToPort(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", list->name, list->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 if (VarTerm)
fprintf(VarTerm, "Usage: alias %s %s\n", list->name, list->syntax);
return 1;
}
int
AliasRedirectAddr(struct cmdtab * list,
int argc,
char **argv,
void *param)
{
if (!(mode & MODE_ALIAS)) {
if (VarTerm)
fprintf(VarTerm, "alias not enabled\n");
} else if (argc == 2) {
int error;
struct in_addr local_addr;
struct in_addr alias_addr;
struct alias_link *link;
error = StrToAddr(argv[0], &local_addr);
if (error) {
if (VarTerm)
fprintf(VarTerm, "address redirect: invalid local address\n");
return 1;
}
error = StrToAddr(argv[1], &alias_addr);
if (error) {
if (VarTerm) {
fprintf(VarTerm, "address redirect: invalid alias address\n");
fprintf(VarTerm, "Usage: alias %s %s\n", list->name, list->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", list->name, list->syntax);
}
} else if (VarTerm)
fprintf(VarTerm, "Usage: alias %s %s\n", list->name, list->syntax);
return 1;
}
static int
StrToAddr(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(char *str,
u_short * port,
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;
}
int
StrToAddrAndPort(char *str,
struct in_addr * addr,
u_short * port,
char *proto)
{
char *ptr;
ptr = strchr(str, ':');
if (!ptr) {
LogPrintf(LogWARN, "StrToAddrAndPort: %s is missing port number.\n",
str);
return -1;
}
*ptr = '\0';
++ptr;
if (StrToAddr(str, addr) != 0)
return -1;
return StrToPort(ptr, port, proto);
}
|
