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
200
201
202
203
204
205
|
#include <stdlib.h>
#include <stdio.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include "log.h"
#include "socket.h"
#include "request.h"
#define TIMEOUT 120
int inetd;
int ipversion;
Conn_Struct conn;
static int s;
void SetInetdSocket()
{
dup2(0,1);
s=1;
}
int NewConn(void)
{
struct sockaddr_in6 sa;
socklen_t slt=sizeof(sa);
int s2;
char rmt[40], loc[40];
if(inetd) {
if(getpeername(s, (struct sockaddr *)&sa, &slt))
LogError("getpeername");
ipversion=((struct sockaddr *)&sa)->sa_family==AF_INET?4:6;
} else {
if((s2=accept(s, (struct sockaddr *)&sa, &slt))<0)
LogError("accept");
if(fork()) {
close(s2);
return(1);
}
close(s);
s=s2;
}
if(ipversion==6) {
conn.rh=sa.sin6_addr;
conn.rp=htons(sa.sin6_port);
} else {
conn.rh.s6_addr32[3]=((struct sockaddr_in *)&sa)->sin_addr.s_addr;
conn.rp=htons(((struct sockaddr_in *)&sa)->sin_port);
}
if(getsockname(s, (struct sockaddr *)&sa, &slt))
LogError("getsockname");
if(ipversion==6) {
conn.lh=sa.sin6_addr;
conn.lp=htons(sa.sin6_port);
} else {
conn.lh.s6_addr32[3]=((struct sockaddr_in *)&sa)->sin_addr.s_addr;
conn.lp=htons(((struct sockaddr_in *)&sa)->sin_port);
}
// Log
inet_ntop(ipversion==4?AF_INET:AF_INET6, &conn.rh.s6_addr32[ipversion==4?3:0], rmt, 40);
inet_ntop(ipversion==4?AF_INET:AF_INET6, &conn.lh.s6_addr32[ipversion==4?3:0], loc, 40);
Log("[%s]:%i -> [%s]:%i", rmt, conn.rp, loc, conn.lp);
return(0);
}
static void BindListen(int port)
{
socklen_t slt;
struct sockaddr *sa;
struct sockaddr_in sa4;
struct sockaddr_in6 sa6;
if(ipversion==4) {
sa4.sin_family=AF_INET;
sa4.sin_port=htons(port);
sa4.sin_addr.s_addr=INADDR_ANY;
sa=(struct sockaddr *)&sa4;
slt=sizeof(sa4);
} else {
sa6.sin6_family=AF_INET6;
sa6.sin6_port=htons(port);
sa6.sin6_addr=in6addr_any;
sa6.sin6_flowinfo=0;
sa6.sin6_scope_id=0;
sa=(struct sockaddr *)&sa6;
slt=sizeof(sa6);
}
if(bind(s, sa, slt))
LogError("bind");
if(listen(s,3))
LogError("listen");
Log("Using IPv%i", ipversion);
}
void OpenListenSock(int port, int forcev4)
{
int one=1;
if (!forcev4) {
if((s = socket(PF_INET6, SOCK_STREAM, 0)) < 0) {
if(errno!=EAFNOSUPPORT)
LogError("socket");
else
Log("IPv6 not available");
} else {
if(setsockopt(s,SOL_SOCKET,SO_REUSEADDR,&one,sizeof(one)))
LogError("setsockopt");
ipversion=6;
return(BindListen(port));
}
}
if ((s = socket(PF_INET, SOCK_STREAM, 0)) < 0)
LogError("socket");
if(setsockopt(s,SOL_SOCKET,SO_REUSEADDR,&one,sizeof(one)))
LogError("setsockopt");
ipversion=4;
return(BindListen(port));
}
char *ReadLine(void)
{
static char buf[1024];
static char line[64];
static int len;
int x;
char *p;
int l;
fd_set rfs;
struct timeval tv;
while(!(p=memchr(buf, '\n', len))) {
FD_ZERO(&rfs);
FD_SET(s, &rfs);
tv.tv_sec=TIMEOUT;
tv.tv_usec=0;
switch(select(s+1, &rfs, NULL, NULL, &tv)) {
case -1:
LogError("select");
case 0:
Log("Connection timed out");
return(NULL);
}
switch((x=recv(s, buf+len, 1024-len, 0))) {
case -1:
LogError("recv");
case 0:
Log("Remote host closed connection");
return(NULL);
}
len+=x;
if(len==1024) {
Log("Remote host flooded me");
return(NULL);
}
}
l=p-buf+1;
if(l<4 || l>64) {
Log("Received line to short/long");
return(NULL);
}
if(*(p-1)=='\r') *(p-1)=0;
*p=0;
strcpy(line, buf);
memcpy(buf, buf+l, len-l);
len-=l;
return(line);
}
void Reply_Error(char *error)
{
char *buf;
int l;
l=asprintf(&buf, "%i, %i : ERROR : %s\r\n", req.lp, req.rp, error);
if(send(s, buf, l, 0)==-1) LogError("send");
free(buf);
}
void Reply_User(char *user)
{
char *buf;
int l;
l=asprintf(&buf, "%i, %i : USERID : UNIX : %s\r\n", req.lp, req.rp, user);
if(send(s, buf, l, 0)==-1) LogError("send");
free(buf);
}
|
