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
|
#include "network.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netdb.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
/*
* Create a file descriptor connected to a network socket peer.
* Client sockets will be connected, listening sockets will be bound/listened.
* Returns -1 in case of failure, a valid fd otherwise.
*/
int network_socket(char* host, char* port, int socktype, int listener){
int fd = -1, status, yes = 1, flags;
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = socktype,
.ai_flags = (listener ? AI_PASSIVE : 0)
};
struct addrinfo *info, *addr_it;
status = getaddrinfo(host, port, &hints, &info);
if(status){
fprintf(stderr, "Failed to parse address %s port %s: %s\n", host, port, gai_strerror(status));
return -1;
}
//traverse the result list
for(addr_it = info; addr_it; addr_it = addr_it->ai_next){
fd = socket(addr_it->ai_family, addr_it->ai_socktype, addr_it->ai_protocol);
if(fd < 0){
continue;
}
//set required socket options
yes = 1;
if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(yes)) < 0){
fprintf(stderr, "Failed to enable SO_REUSEADDR on socket: %s\n", strerror(errno));
}
yes = 0;
if(setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (void*)&yes, sizeof(yes)) < 0){
fprintf(stderr, "Failed to unset IPV6_V6ONLY on socket: %s\n", strerror(errno));
}
//TODO loop, bcast for udp
if(listener){
status = bind(fd, addr_it->ai_addr, addr_it->ai_addrlen);
if(status < 0){
close(fd);
continue;
}
}
else{
status = connect(fd, addr_it->ai_addr, addr_it->ai_addrlen);
if(status < 0){
close(fd);
continue;
}
}
break;
}
freeaddrinfo(info);
if(!addr_it){
fprintf(stderr, "Failed to create socket for %s port %s\n", host, port);
return -1;
}
//set nonblocking
flags = fcntl(fd, F_GETFL, 0);
if(fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0){
fprintf(stderr, "Failed to set socket nonblocking: %s\n", strerror(errno));
close(fd);
return -1;
}
if(!listener){
return fd;
}
if(socktype == SOCK_STREAM){
status = listen(fd, SOMAXCONN);
if(status < 0){
fprintf(stderr, "Failed to listen on socket: %s\n", strerror(errno));
close(fd);
return -1;
}
}
return fd;
}
/*
* Create a file descriptor connected to a unix socket peer.
* Client sockets will be connected, listening sockets will be bound.
* Returns -1 in case of failure, a valid fd otherwise.
*/
int network_socket_unix(char* path, int socktype, int listener){
struct sockaddr_un addr = {
.sun_family = AF_UNIX,
};
int fd = socket(AF_UNIX, socktype, 0), flags;
if(fd < 0){
fprintf(stderr, "Failed to create socket: %s\n", strerror(errno));
return -1;
}
//set nonblocking
flags = fcntl(fd, F_GETFL, 0);
if(fcntl(fd, F_SETFL, flags | O_NONBLOCK) < 0){
fprintf(stderr, "Failed to set socket nonblocking: %s\n", strerror(errno));
close(fd);
return -1;
}
strncpy(addr.sun_path, path, (strlen(path) < (sizeof(addr.sun_path) - 1)) ? strlen(path) : (sizeof(addr.sun_path) - 1));
if(listener){
unlink(path);
if(bind(fd, (struct sockaddr*) &addr, sizeof(addr))){
fprintf(stderr, "Failed to bind %s: %s\n", path, strerror(errno));
close(fd);
return -1;
}
if(listen(fd, SOMAXCONN)){
fprintf(stderr, "Failed to listen on %s: %s\n", path, strerror(errno));
close(fd);
return -1;
}
return fd;
}
//connect clients
if(connect(fd, (struct sockaddr*) &addr, sizeof(addr))){
fprintf(stderr, "Failed to connect to %s: %s\n", path, strerror(errno));
close(fd);
return -1;
}
return fd;
}
/*
* Send arbitrary data over multiple writes if necessary.
* Returns 0 on success
*/
int network_send(int fd, uint8_t* data, size_t length){
//TODO probably should introduce send buffering at some point
ssize_t total = 0, sent;
while(total < length){
sent = send(fd, data + total, length - total, 0);
if(sent < 0){
fprintf(stderr, "Failed to send: %s\n", strerror(errno));
return 1;
}
total += sent;
}
return 0;
}
/*
* Send string data over multiple writes if necessary.
* Returns 0 on success
*/
int network_send_str(int fd, char* data){
return network_send(fd, (uint8_t*) data, strlen(data));
}
|
