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annotate toys/netcat.c @ 189:22d22427dec6

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Add first pass at netcat. Base applet, -f, and -w implemented.
author Rob Landley <rob@landley.net>
date Mon, 03 Dec 2007 18:53:00 -0600
parents
children 30a6db5a95c2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
189
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
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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.
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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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>
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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5 */
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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6
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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7 #include "toys.h"
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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8 #include "toynet.h"
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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9
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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10 #include <sys/socket.h>
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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11 #include <netinet/in.h>
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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12 #include <arpa/inet.h>
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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13
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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14 #define TT toy.netcat
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 static void timeout(int signum)
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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17 {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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18 error_exit("Timeout");
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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19 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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20
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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21 // Translate x.x.x.x numeric IPv4 address, or else DNS lookup an IPv4 name.
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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22 void lookup_name(char *name, uint32_t *result)
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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23 {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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24 struct hostent *hostbyname;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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25
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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26 hostbyname = gethostbyname(*toys.optargs);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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27 if (!hostbyname) error_exit("name lookup failed");
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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28 *result = *(uint32_t *)*hostbyname->h_addr_list;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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29 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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30
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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31 // Worry about a fancy lookup later.
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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32 void lookup_port(char *str, uint16_t *port)
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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33 {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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34 *port = SWAP_BE16(atoi(str));
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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35 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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36
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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37 void netcat_main(void)
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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38 {
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39 int sockfd, pollcount;
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40 struct pollfd pollfds[2];
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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41
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42 if (TT.wait) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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43 signal(SIGALRM, timeout);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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44 alarm(TT.wait);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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45 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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46
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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47 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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48 else {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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49 int temp;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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50 struct sockaddr_in address;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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51
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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52 // 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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53 if (!*toys.optargs || !toys.optargs[1]) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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54 toys.exithelp++;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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55 error_exit("Need address and port");
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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56 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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57
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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58 // Setup socket
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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59 sockfd = socket(AF_INET, SOCK_STREAM, 0);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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60 if (-1 == sockfd) perror_exit("socket");
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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61 fcntl(sockfd, F_SETFD, FD_CLOEXEC);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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62 temp = 1;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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63 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &temp, sizeof(temp));
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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64 memset(&address, 0, sizeof(address));
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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65 address.sin_family = AF_INET;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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66 if (TT.port) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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67 address.sin_port = TT.port;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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68 if (-1 == bind(sockfd, &address, sizeof(address)))
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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69 perror_exit("bind");
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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70 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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71
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72 // Figure out where to dial out to.
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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73 lookup_name(*toys.optargs, (uint32_t *)&address.sin_addr);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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74 lookup_port(toys.optargs[1], &address.sin_port);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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75 temp = connect(sockfd, (struct sockaddr *)&address, sizeof(address));
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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76 if (temp<0) perror_exit("connect");
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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77 pollfds[0].fd = sockfd;
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78 }
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79
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80 // We have a connection. Disarm timeout.
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81 if (TT.wait) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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82 alarm(0);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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83 signal(SIGALRM, SIG_DFL);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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84 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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85
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86 pollcount = 2;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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87 pollfds[1].fd = 0;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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88 pollfds[0].events = pollfds[1].events = POLLIN;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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89
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90 // Poll loop copying stdin->socket and socket->stdout.
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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91 for (;;) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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92 int i;
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93
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94 if (0>poll(pollfds, pollcount, -1)) perror_exit("poll");
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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95
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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96 for (i=0; i<pollcount; i++) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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97 if (pollfds[i].revents & POLLIN) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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98 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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99 if (len<1) goto dohupnow;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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100 xwrite(i ? pollfds[0].fd : 1, toybuf, len);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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101 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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102 if (pollfds[i].revents & POLLHUP) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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103 dohupnow:
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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104 // 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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105 // "echo GET / | netcat landley.net 80" to work.
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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106 if (i) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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107 shutdown(pollfds[0].fd, SHUT_WR);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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108 pollcount--;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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109 } else goto cleanup;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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110 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
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111 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
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112 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
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113 cleanup:
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
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114 close(pollfds[0].fd);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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115 // close(sockfd);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
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116 }