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annotate toys/netcat.c @ 233:d4176f3f3835

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Zap toys/Config.in and instead create generated/Config.in from contents of toys/*.c. Move relevant info into comment at the top of each toys/*.c. Also convert more of Makefile into a thin wrapper around shell scripts that actually do the work. (Makefile is only still there for the user interface.)
author Rob Landley <rob@landley.net>
date Sat, 19 Jan 2008 17:08:39 -0600
parents 30a6db5a95c2
children 163498bf547b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
233
d4176f3f3835 Zap toys/Config.in and instead create generated/Config.in from contents of
Rob Landley <rob@landley.net>
parents: 194
diff changeset
1 /* vi: set sw=4 ts=4:
d4176f3f3835 Zap toys/Config.in and instead create generated/Config.in from contents of
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2 *
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3 * nc: mini-netcat - Forward stdin/stdout to a file or network connection.
189
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4 *
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5 * Copyright 2007 Rob Landley <rob@landley.net>
194
30a6db5a95c2 Add comments about SUSv3 specs (or lack thereof).
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6 *
30a6db5a95c2 Add comments about SUSv3 specs (or lack thereof).
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7 * Not in SUSv3.
233
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8
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9 config NETCAT
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10 bool "netcat"
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11 default n
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12 help
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13 usage: netcat [-iwlp] {IPADDR PORTNUM|-f FILENAME} [-e COMMAND]
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14
d4176f3f3835 Zap toys/Config.in and instead create generated/Config.in from contents of
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15 -e exec the rest of the command line
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16 -i SECONDS delay after each line sent
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17 -w SECONDS timeout for connection
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18 -f filename use file (ala /dev/ttyS0) instead of network
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19 -l listen for incoming connection (twice for persistent connection)
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20 -p local port number
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21 -s local source address
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22 -q SECONDS quit this many seconds after EOF on stdin.
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23
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24 Use -l twice with -e for a quick-and-dirty server.
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25
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26 Use "stty 115200 -F /dev/ttyS0 && stty raw -echo -ctlecho" with
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27 netcat -f to connect to a serial port.
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28 */
189
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29
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30 #include "toys.h"
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31 #include "toynet.h"
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32
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33 #define TT toy.netcat
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34
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35 static void timeout(int signum)
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36 {
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37 error_exit("Timeout");
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38 }
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39
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40 // Translate x.x.x.x numeric IPv4 address, or else DNS lookup an IPv4 name.
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41 void lookup_name(char *name, uint32_t *result)
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42 {
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43 struct hostent *hostbyname;
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44
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45 hostbyname = gethostbyname(*toys.optargs);
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46 if (!hostbyname) error_exit("name lookup failed");
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47 *result = *(uint32_t *)*hostbyname->h_addr_list;
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48 }
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49
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50 // Worry about a fancy lookup later.
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51 void lookup_port(char *str, uint16_t *port)
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52 {
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53 *port = SWAP_BE16(atoi(str));
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54 }
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55
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56 void netcat_main(void)
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57 {
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58 int sockfd, pollcount;
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59 struct pollfd pollfds[2];
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60
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61 if (TT.wait) {
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62 signal(SIGALRM, timeout);
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63 alarm(TT.wait);
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64 }
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65
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66 if (TT.filename) pollfds[0].fd = xopen(TT.filename, O_RDWR);
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67 else {
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68 int temp;
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69 struct sockaddr_in address;
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70
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71 // The argument parsing logic can't make "<2" conditional on "-f", so...
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72 if (!*toys.optargs || !toys.optargs[1]) {
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73 toys.exithelp++;
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74 error_exit("Need address and port");
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75 }
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76
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77 // Setup socket
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78 sockfd = socket(AF_INET, SOCK_STREAM, 0);
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79 if (-1 == sockfd) perror_exit("socket");
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80 fcntl(sockfd, F_SETFD, FD_CLOEXEC);
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81 temp = 1;
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82 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &temp, sizeof(temp));
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83 memset(&address, 0, sizeof(address));
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84 address.sin_family = AF_INET;
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85 if (TT.port) {
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86 address.sin_port = TT.port;
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87 if (-1 == bind(sockfd, &address, sizeof(address)))
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88 perror_exit("bind");
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89 }
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90
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91 // Figure out where to dial out to.
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92 lookup_name(*toys.optargs, (uint32_t *)&address.sin_addr);
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93 lookup_port(toys.optargs[1], &address.sin_port);
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94 temp = connect(sockfd, (struct sockaddr *)&address, sizeof(address));
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95 if (temp<0) perror_exit("connect");
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96 pollfds[0].fd = sockfd;
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97 }
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98
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99 // We have a connection. Disarm timeout.
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100 if (TT.wait) {
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101 alarm(0);
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102 signal(SIGALRM, SIG_DFL);
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103 }
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104
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105 pollcount = 2;
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106 pollfds[1].fd = 0;
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107 pollfds[0].events = pollfds[1].events = POLLIN;
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108
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109 // Poll loop copying stdin->socket and socket->stdout.
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110 for (;;) {
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111 int i;
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112
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113 if (0>poll(pollfds, pollcount, -1)) perror_exit("poll");
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114
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115 for (i=0; i<pollcount; i++) {
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116 if (pollfds[i].revents & POLLIN) {
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117 int len = read(pollfds[i].fd, toybuf, sizeof(toybuf));
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118 if (len<1) goto dohupnow;
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119 xwrite(i ? pollfds[0].fd : 1, toybuf, len);
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120 }
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121 if (pollfds[i].revents & POLLHUP) {
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122 dohupnow:
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123 // Close half-connect. This is needed for things like
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124 // "echo GET / | netcat landley.net 80" to work.
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125 if (i) {
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126 shutdown(pollfds[0].fd, SHUT_WR);
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127 pollcount--;
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128 } else goto cleanup;
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129 }
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130 }
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131 }
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Rob Landley <rob@landley.net>
parents:
diff changeset
132 cleanup:
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
133 close(pollfds[0].fd);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
134 // close(sockfd);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
135 }