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
|
/*
* DDNS v3 Client
*
* By: Alan Yates <alany@ay.com.au>
* Date: 27-08-2000
*/
#ifdef WIN32
#include <windows.h>
#else
#include <netdb.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <string.h>
#endif
#include <stdio.h>
#include "sockio.h"
int
ddns3_sockio_resolve(char *str, struct sockaddr_in *sai) {
struct hostent *he;
char buf[500];
char err[100];
short port;
int ret, i;
for(i = 0; str[i]; i++) if(str[i] == ':') str[i] = ' ';
ret = sscanf(str, "%s%hd", buf, &port);
if(ret < 2) return -1;
if((inet_aton(buf, &sai->sin_addr)) == 0) {
if(!(he = gethostbyname(buf))) {
//perror("gethostbyname()");
ddns3_sockio_error(err,100);
fprintf(stderr,"gethostbyname(): %s\n", err);
return -1;
}
memcpy(&sai->sin_addr.s_addr, he->h_addr, he->h_length);
}
sai->sin_port = htons(port);
sai->sin_family = AF_INET;
return 0;
}
int
ddns3_sockio_connect(char *host) {
int ret;
int sock;
struct sockaddr_in sai;
char err[100];
sock = socket(PF_INET, SOCK_STREAM, 0);
if(sock < 0) {
//perror("socket(PF_INET, SOCK_STREAM, 0)");
ddns3_sockio_error(err,100);
fprintf(stderr, "socket(): %s\n",err);
return -1;
}
ret = ddns3_sockio_resolve(host, &sai);
if(ret < 0) {
return -1;
}
ret = connect(sock, (struct sockaddr *)&sai, sizeof(struct sockaddr_in));
if(ret < 0) {
//perror("connect()");
ddns3_sockio_error(err,100);
fprintf(stderr, "connect(): %s\n",err);
return -1;
}
return sock;
}
int
ddns3_sockio_write(int sock, char *buf, int len) {
int ret;
char err[100];
/* FIXME: we pretend short writes never happen! */
ret = send(sock, buf, len, 0);
if(ret < 0) {
//perror("write()");
ddns3_sockio_error(err,100);
fprintf(stderr, "send(): %s\n", err);
}
return ret;
}
int
ddns3_sockio_read(int sock, char *buf, int len) {
int ret;
char err[100];
ret = recv(sock, buf, len, 0);
if(ret < 0){
//perror("read()");
ddns3_sockio_error(err,100);
fprintf(stderr, "recv(): %s\n", err);
}
return ret;
}
int
ddns3_sockio_close(int sock) {
#ifdef WIN32
closesocket(sock);
#else
close(sock);
#endif
return 0;
}
int
ddns3_sockio_init(void) {
#ifdef WIN32
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 1, 1 );
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
/* Tell the user that we could not find a usable */
/* WinSock DLL. */
return -1;
}
#endif
return 0;
}
int
ddns3_sockio_cleanup(void) {
#ifdef WIN32
WSACleanup();
#endif
return 0;
}
int
ddns3_sockio_error(char *buf, int len) {
int code;
#ifdef WIN32
code = WSAGetLastError();
sprintf(buf,"%d",code);
#else
code = errno;
sprintf(buf,"%s",strerror(code));
#endif
return code;
}
int
ddns3_sockio_getlocalip(int sock, char *buf, int len) {
int ret;
char err[100];
struct sockaddr_in sai;
int sailen = sizeof(struct sockaddr_in);
ret = getsockname(sock, (struct sockaddr *)&sai, &sailen);
if(ret < 0) {
ddns3_sockio_error(err,100);
fprintf(stderr, "getsockname(): %s\n", err);
}
if(!buf || len < 16) return -1;
return sprintf(buf, "%s", inet_ntoa(sai.sin_addr));
}
|
