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
|
/* network.c - (c) rohan drape, 2005-2006 */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/select.h>
#include "int.h"
#include "failure.h"
#include "time-timeval.h"
int socket_udp(int flags)
{
int fd = socket(AF_INET, SOCK_DGRAM, flags);
if(fd < 0) {
perror("socket_udp: socket() failed");
FAILURE;
}
return fd;
}
void init_sockaddr_in(struct sockaddr_in *name, const char *hostname, uint16_t port)
{
name->sin_family = AF_INET;
name->sin_port = htons(port);
if(hostname) {
struct hostent *hostinfo = gethostbyname(hostname);
if (hostinfo == NULL) {
fprintf(stderr, "init_sockaddr_in: unknown host: %s.\n", hostname);
FAILURE;
}
name->sin_addr = *(struct in_addr *) hostinfo->h_addr_list[0];
} else {
name->sin_addr.s_addr = htonl(INADDR_ANY);
}
}
void init_broadcast_sockaddr_in(struct sockaddr_in *name, uint16_t port)
{
name->sin_family = AF_INET;
name->sin_port = htons(port);
name->sin_addr.s_addr = htonl(INADDR_BROADCAST);
}
int sockaddr_in_equal(const struct sockaddr_in *a, const struct sockaddr_in *b)
{
return(( a->sin_family == b->sin_family)&&
(a->sin_addr.s_addr == b->sin_addr.s_addr)&&
(a->sin_port == b->sin_port));
}
void print_sockaddr_in(FILE *fp, struct sockaddr_in a)
{
fprintf(fp, "sin_family %d\n", a.sin_family);
fprintf(fp, "sin_port %d\n", a.sin_port);
fprintf(fp, "sin_addr.s_addr %d\n", a.sin_addr.s_addr);
}
void bind_inet(int fd, const char *hostname, int port)
{
struct sockaddr_in name;
init_sockaddr_in(&name, hostname, port);
int err = bind(fd, (struct sockaddr *)&name, sizeof(name));
if(err < 0) {
perror("bind_inet: bind() failed");
FAILURE;
}
}
void connect_inet(int fd, const char *hostname, int port)
{
struct sockaddr_in name;
init_sockaddr_in(&name, hostname, port);
int err = connect(fd, (struct sockaddr *)&name, sizeof(name));
if(err < 0) {
perror("connect_inet: bind() failed");
FAILURE;
}
}
int xsendto(int fd, const void *data, size_t n, int flags, struct sockaddr *addr, socklen_t length)
{
int err = sendto(fd, data, n, flags, addr, length);
if(err < 0) {
perror("sendto() failed");
FAILURE;
}
return err;
}
void sendto_exactly(int fd, const u8 *data, int n, struct sockaddr_in address)
{
int err = xsendto(fd, data, n, 0, (struct sockaddr *)&address, sizeof(address));
if(err != n) {
fprintf(stderr, "sendto_exactly: partial write\n");
FAILURE;
}
}
int xrecv(int fd, void *buf, size_t n, int flags)
{
int err = recv(fd, buf, n, flags);
if(err < 0) {
perror("recv() failed");
FAILURE;
}
return err;
}
void recv_exactly(int fd, void *buf, size_t n, int flags)
{
int err = (int) xrecv(fd, buf, n, flags);
if(err != n) {
fprintf(stderr, "recv_exactly: partial recv (%d != %ul)\n", err, (int) n);
FAILURE;
}
}
int xrecvfrom(int fd, void *buf, size_t n, int flags, struct sockaddr *addr, socklen_t *length)
{
int err = recvfrom(fd, buf, n, flags, addr, length);
if(err < 0) {
perror("recvfrom() failed");
FAILURE;
}
return err;
}
void recvfrom_exactly(int fd, void *buf, size_t n, int flags, struct sockaddr *addr, socklen_t *length)
{
int err = (int) xrecvfrom(fd, buf, n, flags, addr, length);
if(err != n) {
fprintf(stderr, "recvfrom_exactly: partial recv (%d != %d)\n", err, (int) n);
FAILURE;
}
}
/* Wait at most `timeout' usecs for `fd' to become readable. Returns
0 on timeout, 1 if data is available. */
int fd_wait(int fd, unsigned long timeout)
{
fd_set set;
FD_ZERO(&set);
FD_SET(fd, &set);
struct timeval t;
t = usec_to_timeval(timeout);
int err;
err = select(FD_SETSIZE, &set, NULL, NULL, &t);
if(err == -1) {
fprintf(stderr, "fd_wait: select failed, %d\n", err);
FAILURE;
}
return err;
}
|
