1 #include "toys.h"
2
xsocket(int domain,int type,int protocol)3 int xsocket(int domain, int type, int protocol)
4 {
5 int fd = socket(domain, type, protocol);
6
7 if (fd < 0) perror_exit("socket %x %x", type, protocol);
8 fcntl(fd, F_SETFD, FD_CLOEXEC);
9
10 return fd;
11 }
12
xsetsockopt(int fd,int level,int opt,void * val,socklen_t len)13 void xsetsockopt(int fd, int level, int opt, void *val, socklen_t len)
14 {
15 if (-1 == setsockopt(fd, level, opt, val, len)) perror_exit("setsockopt");
16 }
17
xconnect(char * host,char * port,int family,int socktype,int protocol,int flags)18 int xconnect(char *host, char *port, int family, int socktype, int protocol,
19 int flags)
20 {
21 struct addrinfo info, *ai, *ai2;
22 int fd;
23
24 memset(&info, 0, sizeof(struct addrinfo));
25 info.ai_family = family;
26 info.ai_socktype = socktype;
27 info.ai_protocol = protocol;
28 info.ai_flags = flags;
29
30 fd = getaddrinfo(host, port, &info, &ai);
31 if (fd || !ai)
32 error_exit("Connect '%s%s%s': %s", host, port ? ":" : "", port ? port : "",
33 fd ? gai_strerror(fd) : "not found");
34
35 // Try all the returned addresses. Report errors if last entry can't connect.
36 for (ai2 = ai; ai; ai = ai->ai_next) {
37 fd = (ai->ai_next ? socket : xsocket)(ai->ai_family, ai->ai_socktype,
38 ai->ai_protocol);
39 if (!connect(fd, ai->ai_addr, ai->ai_addrlen)) break;
40 else if (!ai->ai_next) perror_exit("connect");
41 close(fd);
42 }
43 freeaddrinfo(ai2);
44
45 return fd;
46 }
47
xpoll(struct pollfd * fds,int nfds,int timeout)48 int xpoll(struct pollfd *fds, int nfds, int timeout)
49 {
50 int i;
51
52 for (;;) {
53 if (0>(i = poll(fds, nfds, timeout))) {
54 if (toys.signal) return i;
55 if (errno != EINTR && errno != ENOMEM) perror_exit("xpoll");
56 else if (timeout>0) timeout--;
57 } else return i;
58 }
59 }
60
61 // Loop forwarding data from in1 to out1 and in2 to out2, handling
62 // half-connection shutdown. timeouts return if no data for X miliseconds.
63 // Returns 0: both closed, 1 shutdown_timeout, 2 timeout
pollinate(int in1,int in2,int out1,int out2,int timeout,int shutdown_timeout)64 int pollinate(int in1, int in2, int out1, int out2, int timeout, int shutdown_timeout)
65 {
66 struct pollfd pollfds[2];
67 int i, pollcount = 2;
68
69 memset(pollfds, 0, 2*sizeof(struct pollfd));
70 pollfds[0].events = pollfds[1].events = POLLIN;
71 pollfds[0].fd = in1;
72 pollfds[1].fd = in2;
73
74 // Poll loop copying data from each fd to the other one.
75 for (;;) {
76 if (!xpoll(pollfds, pollcount, timeout)) return pollcount;
77
78 for (i=0; i<pollcount; i++) {
79 if (pollfds[i].revents & POLLIN) {
80 int len = read(pollfds[i].fd, libbuf, sizeof(libbuf));
81 if (len<1) pollfds[i].revents = POLLHUP;
82 else xwrite(i ? out2 : out1, libbuf, len);
83 }
84 if (pollfds[i].revents & POLLHUP) {
85 // Close half-connection. This is needed for things like
86 // "echo GET / | netcat landley.net 80"
87 // Note that in1 closing triggers timeout, in2 returns now.
88 if (i) {
89 shutdown(pollfds[0].fd, SHUT_WR);
90 pollcount--;
91 timeout = shutdown_timeout;
92 } else return 0;
93 }
94 }
95 }
96 }
97