source: trunk/minix/commands/simple/rget.c@ 15

Last change on this file since 15 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a
File size: 6.8 KB
Line 
1/* rget 2.6 - remote pipe Author: Kees J. Bot
2 * 20 Mar 1989
3 *
4 * here$ ... | rput key there$ rget -h here key | ...
5 * here$ rput key command ... there$ rget -h here key command ...
6 *
7 * (Once my first try at network programming, completely reworked by now.)
8 */
9#define nil ((void*)0)
10#include <sys/types.h>
11#include <sys/ioctl.h>
12#include <stdio.h>
13#include <fcntl.h>
14#include <stdlib.h>
15#include <unistd.h>
16#include <string.h>
17#include <errno.h>
18#if __minix
19#include <net/gen/in.h>
20#include <net/gen/inet.h>
21#include <net/gen/netdb.h>
22#include <net/gen/socket.h>
23#include <net/gen/tcp.h>
24#include <net/gen/tcp_hdr.h>
25#include <net/gen/tcp_io.h>
26#include <net/hton.h>
27#include <net/netlib.h>
28#else
29#include <sys/socket.h>
30#include <netinet/in.h>
31#include <netdb.h>
32#endif
33
34static char *name;
35static int iflag, oflag, hflag, lflag, cflag; /* -iolch? */
36static char *host; /* Argument to -h. */
37static struct hostent *hent; /* gethostbyname(host) */
38static char *key; /* key (port) */
39static char **cmdv; /* command [arg ...] */
40
41static void fatal(const char *label)
42{
43 int err= errno;
44
45 fprintf(stderr, "%s: %s: %s\n", name, label, strerror(err));
46 exit(1);
47}
48
49static unsigned name2port(char *n)
50{
51 char *end;
52 unsigned port;
53
54 port= strtoul(n, &end, 0);
55 if (end == n || *end != 0) {
56 port= 1;
57 while (*n != 0) port *= (*n++ & 0xFF);
58 port |= 0x8000;
59 }
60 return htons(port & 0xFFFF);
61}
62
63static void usage(void)
64{
65 fprintf(stderr,
66 "Usage: %s [-lcio] [-h host] key [command [arg ...]]\n"
67 "\t-l: Open TCP socket and listen (default for rput)\n"
68 "\t-c: Connect to a remote TCP socket (default for rget)\n"
69 "\t-i: Tie standard input to the TCP stream (default for rget)\n"
70 "\t-o: Tie standard output to the TCP stream (default for rput)\n"
71 "\t-io: Bidirectional!\n"
72 "\tkey: A word to hash into a port number, or simply a port number\n",
73 name);
74 exit(1);
75}
76
77int main(int argc, char **argv)
78{
79 int i, s;
80
81 if ((name= strrchr(argv[0], '/')) == nil) name= argv[0]; else name++;
82
83 if (strcmp(name, "rget") != 0 && strcmp(name, "rput") != 0) {
84 fprintf(stderr, "Don't know what to do if you call me '%s'\n", name);
85 exit(1);
86 }
87
88 i= 1;
89 while (i < argc && argv[i][0] == '-') {
90 char *opt= argv[i++]+1;
91
92 if (opt[0] == '-' && opt[1] == 0) break; /* -- */
93
94 while (*opt != 0) switch (*opt++) {
95 case 'l': lflag= 1; break;
96 case 'c': cflag= 1; break;
97 case 'i': iflag= 1; break;
98 case 'o': oflag= 1; break;
99 case 'h':
100 hflag= 1;
101 if (*opt == 0) {
102 if (i == argc) usage();
103 opt= argv[i++];
104 }
105 host= opt;
106 opt= "";
107 break;
108 default: usage(); break;
109 }
110 }
111
112 if (i == argc) usage();
113 key= argv[i++];
114 cmdv= argv + i;
115
116 /* Defaults. */
117 if (!lflag && !cflag) {
118 if (name[1] == 'p') lflag= 1;
119 if (name[1] == 'g') cflag= 1;
120 }
121 if (!iflag && !oflag) {
122 if (name[1] == 'g') iflag= 1;
123 if (name[1] == 'p') oflag= 1;
124 }
125
126 /* Constraints. */
127 if (lflag && cflag) {
128 fprintf(stderr, "%s: -c and -l don't mix\n", name);
129 usage();
130 }
131 if (cflag && !hflag) {
132 fprintf(stderr, "%s: -c requires a host name given with -h\n", name);
133 usage();
134 }
135 if (lflag && hflag) {
136 fprintf(stderr, "%s: -l does not require a host name given with -h\n",
137 name);
138 usage();
139 }
140 if (iflag && oflag && cmdv[0] == nil) {
141 fprintf(stderr, "%s: -io requires that a command is given\n", name);
142 usage();
143 }
144
145 if (hflag) {
146 if ((hent= gethostbyname(host)) == nil) {
147 fprintf(stderr, "%s: %s: Name lookup failed\n", name, host);
148 exit(1);
149 }
150 }
151
152 s= -1;
153 if (lflag) {
154 /* We need to listen and wait. (We're "rput", most likely.) */
155#if __minix
156 char *tcp_device;
157 struct nwio_tcpconf tcpconf;
158 struct nwio_tcpcl tcplistenopt;
159
160 if ((tcp_device= getenv("TCP_DEVICE")) == nil) tcp_device= "/dev/tcp";
161 if ((s= open(tcp_device, O_RDWR)) < 0) fatal(tcp_device);
162
163 tcpconf.nwtc_flags=
164 NWTC_EXCL | NWTC_LP_SET | NWTC_UNSET_RA | NWTC_UNSET_RP;
165 tcpconf.nwtc_locport= name2port(key);
166 if (ioctl(s, NWIOSTCPCONF, &tcpconf) < 0) fatal("NWIOSTCPCONF");
167
168 tcplistenopt.nwtcl_flags= 0;
169 if (ioctl(s, NWIOTCPLISTEN, &tcplistenopt) < 0) fatal("NWIOTCPLISTEN");
170#else
171 int sa;
172 struct sockaddr_in channel;
173 static int on= 1;
174
175 if ((s= socket(AF_INET, SOCK_STREAM, IPPROTO_TCP))<0) fatal("socket()");
176
177 (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *) &on,
178 sizeof(on));
179 memset(&channel, 0, sizeof(channel));
180 channel.sin_family= AF_INET;
181 channel.sin_addr.s_addr= htonl(INADDR_ANY);
182 channel.sin_port= name2port(key);
183 if (bind(s, (struct sockaddr *) &channel, sizeof(channel)) < 0)
184 fatal("bind()");
185
186 if (listen(s, 0) < 0) fatal("listen()");
187
188 if ((sa= accept(s, nil, nil)) < 0) fatal("accept()");
189 close(s);
190 s= sa;
191#endif
192 }
193
194 if (cflag) {
195 /* Connect to the remote end. (We're "rget", most likely.) */
196#if __minix
197 int n;
198 char *tcp_device;
199 nwio_tcpconf_t tcpconf;
200 nwio_tcpcl_t tcpconnopt;
201
202 if ((tcp_device= getenv("TCP_DEVICE")) == nil) tcp_device= "/dev/tcp";
203
204 n=60;
205 for (;;) {
206 if ((s= open(tcp_device, O_RDWR)) < 0) fatal(tcp_device);
207
208 tcpconf.nwtc_flags= NWTC_LP_SEL | NWTC_SET_RA | NWTC_SET_RP;
209 memcpy(&tcpconf.nwtc_remaddr, hent->h_addr,
210 sizeof(tcpconf.nwtc_remaddr));
211 tcpconf.nwtc_remport= name2port(key);
212 if (ioctl(s, NWIOSTCPCONF, &tcpconf) < 0) fatal("NWIOSTCPCONF");
213
214 tcpconnopt.nwtcl_flags= 0;
215 if (ioctl(s, NWIOTCPCONN, &tcpconnopt) == 0) break;
216
217 if (--n > 0) sleep(2); else fatal("NWIOTCPCONN");
218 close(s);
219 }
220#else
221 int n;
222 struct sockaddr_in channel;
223
224 n=60;
225 for (;;) {
226 if ((s= socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
227 fatal("socket()");
228
229 memset(&channel, 0, sizeof(channel));
230 channel.sin_family= AF_INET;
231 memcpy(&channel.sin_addr.s_addr, hent->h_addr,
232 sizeof(channel.sin_addr.s_addr));
233 channel.sin_port= name2port(key);
234 if (connect(s, (struct sockaddr *) &channel,
235 sizeof(channel)) >= 0) break;
236
237 if (--n > 0) sleep(2); else fatal("connect()");
238 close(s);
239 }
240#endif
241 }
242
243 if (cmdv[0] != nil) {
244 /* A command is given, so execute it with standard input (rget),
245 * standard output (rput) or both (-io) tied to the TCP stream.
246 */
247 if (iflag) dup2(s, 0);
248 if (oflag) dup2(s, 1);
249 close(s);
250
251 execvp(cmdv[0], cmdv);
252 fatal(cmdv[0]);
253 } else {
254 /* Without a command we have to copy bytes ourselves, probably to or
255 * from a command that is connected to us with a pipe. (The original
256 * function of rput/rget, a remote pipe.)
257 */
258 int fi, fo;
259 int n;
260 char buf[8192];
261
262 if (iflag) {
263 fi= s;
264 fo= 1;
265 } else {
266 fi= 0;
267 fo= s;
268 }
269
270 while ((n= read(fi, buf, sizeof(buf))) > 0) {
271 char *bp= buf;
272
273 while (n > 0) {
274 int r;
275
276 if ((r= write(fo, bp, n)) <= 0) {
277 if (r == 0) {
278 fprintf(stderr, "%s: write(): Unexpected EOF\n", name);
279 exit(1);
280 }
281 fatal("write()");
282 }
283 bp+= r;
284 n-= r;
285 }
286 }
287 if (n < 0) fatal("read()");
288 }
289 return 0;
290}
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