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
|
#include <stddef.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "ip_misc.h"
#define Export
/*
* Fill in ADDR from HOST, SERVICE and PROTOCOL.
* PROTOCOL can be tcp or udp.
* Supplying a null pointer for HOST means use INADDR_ANY.
* Supplying a null pointer for SERVICE, means use port 0, i.e. no port.
*
* Returns negative on errors, zero or positive if everything ok.
*/
Export int
get_inaddr(struct sockaddr_in * addr,
const char * host,
const char * service,
const char * protocol)
{
memset(addr, 0, sizeof *addr);
addr->sin_family = AF_INET;
/*
* Set host part of ADDR
*/
if (host == NULL)
addr->sin_addr.s_addr = INADDR_ANY;
else
{
addr->sin_addr.s_addr = inet_addr(host);
if (addr->sin_addr.s_addr == (unsigned long)-1)
{
struct hostent * hp;
hp = gethostbyname(host);
if (hp == NULL)
return -1;
memcpy(&addr->sin_addr, hp->h_addr, hp->h_length);
addr->sin_family = hp->h_addrtype;
}
}
/*
* Set port part of ADDR
*/
if (service == NULL)
addr->sin_port = htons(0);
else
{
char * end;
long portno;
portno = strtol(service, &end, 10);
if (portno > 0 && portno <= 65535
&& end != service && *end == '\0')
{
addr->sin_port = htons(portno);
}
else
{
struct servent * serv;
serv = getservbyname(service, protocol);
if (serv == NULL)
return -1;
addr->sin_port = serv->s_port;
}
}
return 0;
}
|
