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
|
/*
* $Id: $
*/
#include <sys/param.h>
#include <netinet/in.h>
#include <alias.h>
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <unistd.h>
#include "command.h"
#include "systems.h"
#include "mbuf.h"
#include "log.h"
#include "loadalias.h"
#include "vars.h"
#define _PATH_ALIAS "/usr/lib/libalias.so." ## __libalias_version
#define off(item) ((int)&(((struct aliasHandlers *)0)->item))
#define entry(a) { off(a), "_" #a }
static struct {
int offset;
char *name;
} map[] = {
entry(PacketAliasGetFragment),
entry(PacketAliasInit),
entry(PacketAliasIn),
entry(PacketAliasOut),
entry(PacketAliasRedirectAddr),
entry(PacketAliasRedirectPort),
entry(PacketAliasSaveFragment),
entry(PacketAliasSetAddress),
entry(PacketAliasSetMode),
entry(PacketAliasFragmentIn),
{ 0, 0 }
};
static void *dl;
int
loadAliasHandlers(struct aliasHandlers * h)
{
char *path;
char *env;
int i;
path = _PATH_ALIAS;
env = getenv("_PATH_ALIAS");
if (env)
if (OrigUid() == 0)
path = env;
else
LogPrintf(LogALERT, "Ignoring environment _PATH_ALIAS value (%s)\n", env);
dl = dlopen(path, RTLD_LAZY);
if (dl == (void *) 0) {
LogPrintf(LogWARN, "_PATH_ALIAS (%s): Invalid lib: %s\n",
path, dlerror());
return -1;
}
for (i = 0; map[i].name; i++) {
*(void **) ((char *) h + map[i].offset) = dlsym(dl, map[i].name);
if (*(void **) ((char *) h + map[i].offset) == (void *) 0) {
LogPrintf(LogWARN, "_PATH_ALIAS (%s): %s: %s\n", path,
map[i].name, dlerror());
(void) dlclose(dl);
dl = (void *) 0;
return -1;
}
}
VarPacketAliasInit();
return 0;
}
void
unloadAliasHandlers()
{
if (dl) {
dlclose(dl);
dl = (void *) 0;
}
}
|
