Mercurial > hg > toybox

annotate toys/netcat.c @ 226:6aac63925eff

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Update web pages.
author Rob Landley <rob@landley.net>
date Sat, 05 Jan 2008 18:09:49 -0600
parents 30a6db5a95c2
children d4176f3f3835
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189
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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1 /* vi: set sw=4 ts=4: */
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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2 /* nc: mini-netcat - Forward stdin/stdout to a file or network connection.
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3 *
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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4 * Copyright 2007 Rob Landley <rob@landley.net>
194
30a6db5a95c2 Add comments about SUSv3 specs (or lack thereof).
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5 *
30a6db5a95c2 Add comments about SUSv3 specs (or lack thereof).
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6 * Not in SUSv3.
189
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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7 */
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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8
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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9 #include "toys.h"
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10 #include "toynet.h"
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11
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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12 #include <sys/socket.h>
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13 #include <netinet/in.h>
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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14 #include <arpa/inet.h>
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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15
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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16 #define TT toy.netcat
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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17
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18 static void timeout(int signum)
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19 {
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20 error_exit("Timeout");
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21 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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22
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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23 // Translate x.x.x.x numeric IPv4 address, or else DNS lookup an IPv4 name.
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24 void lookup_name(char *name, uint32_t *result)
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25 {
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26 struct hostent *hostbyname;
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27
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28 hostbyname = gethostbyname(*toys.optargs);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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29 if (!hostbyname) error_exit("name lookup failed");
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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30 *result = *(uint32_t *)*hostbyname->h_addr_list;
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31 }
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32
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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33 // Worry about a fancy lookup later.
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34 void lookup_port(char *str, uint16_t *port)
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35 {
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36 *port = SWAP_BE16(atoi(str));
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37 }
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38
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39 void netcat_main(void)
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40 {
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41 int sockfd, pollcount;
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42 struct pollfd pollfds[2];
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43
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44 if (TT.wait) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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45 signal(SIGALRM, timeout);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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46 alarm(TT.wait);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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47 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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48
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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49 if (TT.filename) pollfds[0].fd = xopen(TT.filename, O_RDWR);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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50 else {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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51 int temp;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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52 struct sockaddr_in address;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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53
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54 // The argument parsing logic can't make "<2" conditional on "-f", so...
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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55 if (!*toys.optargs || !toys.optargs[1]) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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56 toys.exithelp++;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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57 error_exit("Need address and port");
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58 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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59
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60 // Setup socket
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61 sockfd = socket(AF_INET, SOCK_STREAM, 0);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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62 if (-1 == sockfd) perror_exit("socket");
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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63 fcntl(sockfd, F_SETFD, FD_CLOEXEC);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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64 temp = 1;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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65 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &temp, sizeof(temp));
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66 memset(&address, 0, sizeof(address));
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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67 address.sin_family = AF_INET;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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68 if (TT.port) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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69 address.sin_port = TT.port;
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70 if (-1 == bind(sockfd, &address, sizeof(address)))
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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71 perror_exit("bind");
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72 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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73
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74 // Figure out where to dial out to.
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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75 lookup_name(*toys.optargs, (uint32_t *)&address.sin_addr);
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76 lookup_port(toys.optargs[1], &address.sin_port);
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77 temp = connect(sockfd, (struct sockaddr *)&address, sizeof(address));
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78 if (temp<0) perror_exit("connect");
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79 pollfds[0].fd = sockfd;
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80 }
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81
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82 // We have a connection. Disarm timeout.
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83 if (TT.wait) {
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84 alarm(0);
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85 signal(SIGALRM, SIG_DFL);
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86 }
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87
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88 pollcount = 2;
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89 pollfds[1].fd = 0;
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90 pollfds[0].events = pollfds[1].events = POLLIN;
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91
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92 // Poll loop copying stdin->socket and socket->stdout.
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93 for (;;) {
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94 int i;
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95
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96 if (0>poll(pollfds, pollcount, -1)) perror_exit("poll");
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97
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98 for (i=0; i<pollcount; i++) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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99 if (pollfds[i].revents & POLLIN) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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100 int len = read(pollfds[i].fd, toybuf, sizeof(toybuf));
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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101 if (len<1) goto dohupnow;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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102 xwrite(i ? pollfds[0].fd : 1, toybuf, len);
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103 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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104 if (pollfds[i].revents & POLLHUP) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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105 dohupnow:
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106 // Close half-connect. This is needed for things like
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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107 // "echo GET / | netcat landley.net 80" to work.
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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108 if (i) {
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109 shutdown(pollfds[0].fd, SHUT_WR);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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110 pollcount--;
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111 } else goto cleanup;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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112 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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113 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
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114 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
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115 cleanup:
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116 close(pollfds[0].fd);
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117 // close(sockfd);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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118 }