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annotate toys/other/netcat.c @ 1005:03f72b57a092

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DHCP client and server, from Ashwini Sharma.
author Rob Landley <rob@landley.net>
date Wed, 14 Aug 2013 19:09:33 -0500
parents 144d5ba7d410
children e11684e3bbc5
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1 /* netcat.c - Forward stdin/stdout to a file or network connection.
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2 *
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3 * Copyright 2007 Rob Landley <rob@landley.net>
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4 *
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5 * TODO: udp, ipv6, genericize for telnet/microcom/tail-f
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6
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7 USE_NETCAT(OLDTOY(nc, netcat, USE_NETCAT_LISTEN("tl^L^")"w#p#s:q#f:", TOYFLAG_BIN))
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8 USE_NETCAT(NEWTOY(netcat, USE_NETCAT_LISTEN("tl^L^")"w#p#s:q#f:", TOYFLAG_BIN))
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9
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10 config NETCAT
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11 bool "netcat"
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12 default y
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13 help
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14 usage: netcat [-wpq #] [-s addr] [-u] {IPADDR PORTNUM|-f FILENAME}
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15
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16 -f use FILENAME (ala /dev/ttyS0) instead of network
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17 -p local port number
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18 -q SECONDS quit this many seconds after EOF on stdin.
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19 -s local ipv4 address
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20 -w SECONDS timeout for connection
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21
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22 Use "stty 115200 -F /dev/ttyS0 && stty raw -echo -ctlecho" with
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23 netcat -f to connect to a serial port.
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24
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25 config NETCAT_LISTEN
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26 bool "netcat server options (-let)"
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27 default y
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28 depends on NETCAT
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29 help
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30 usage: netcat [-t] [-lL COMMAND...]
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31
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32 -t allocate tty (must come before -l or -L)
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33 -l listen for one incoming connection.
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34 -L listen for multiple incoming connections (server mode).
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35
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36 The command line after -l or -L is executed to handle each incoming
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37 connection. If none, the connection is forwarded to stdin/stdout.
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39 For a quick-and-dirty server, try something like:
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40 netcat -s 127.0.0.1 -p 1234 -tL /bin/bash -l
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41 */
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42
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43 #define FOR_netcat
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44 #include "toys.h"
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45 #include "toynet.h"
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46
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47 GLOBALS(
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48 char *filename; // -f read from filename instead of network
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49 long quit_delay; // -q Exit after EOF from stdin after # seconds.
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50 char *source_address; // -s Bind to a specific source address.
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51 long port; // -p Bind to a specific source port.
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52 long wait; // -w Wait # seconds for a connection.
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53 )
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54
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55 static void timeout(int signum)
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56 {
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57 if (TT.wait) error_exit("Timeout");
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58 exit(0);
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59 }
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60
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61 static void set_alarm(int seconds)
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62 {
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63 signal(SIGALRM, seconds ? timeout : SIG_DFL);
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64 alarm(seconds);
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65 }
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66
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67 // Translate x.x.x.x numeric IPv4 address, or else DNS lookup an IPv4 name.
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68 static void lookup_name(char *name, uint32_t *result)
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69 {
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70 struct hostent *hostbyname;
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71
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72 hostbyname = gethostbyname(name); // getaddrinfo
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73 if (!hostbyname) error_exit("no host '%s'", name);
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74 *result = *(uint32_t *)*hostbyname->h_addr_list;
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75 }
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76
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77 // Worry about a fancy lookup later.
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78 static void lookup_port(char *str, uint16_t *port)
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79 {
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80 *port = SWAP_BE16(atoi(str));
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81 }
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82
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83 void netcat_main(void)
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84 {
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85 int sockfd=-1, pollcount=2;
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86 struct pollfd pollfds[2];
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87
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88 memset(pollfds, 0, 2*sizeof(struct pollfd));
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89 pollfds[0].events = pollfds[1].events = POLLIN;
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90 set_alarm(TT.wait);
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91
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92 // The argument parsing logic can't make "<2" conditional on other
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93 // arguments like -f and -l, so we do it by hand here.
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94 if (toys.optflags&FLAG_f) {
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95 if (toys.optc) toys.exithelp++;
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96 } else if (!(toys.optflags&(FLAG_l|FLAG_L)) && toys.optc!=2) toys.exithelp++;
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97
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98 if (toys.exithelp) error_exit("Argument count wrong");
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100 if (TT.filename) pollfds[0].fd = xopen(TT.filename, O_RDWR);
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101 else {
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102 int temp;
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103 struct sockaddr_in address;
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105 // Setup socket
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106 sockfd = xsocket(AF_INET, SOCK_STREAM, 0);
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107 fcntl(sockfd, F_SETFD, FD_CLOEXEC);
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108 temp = 1;
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109 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &temp, sizeof(temp));
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110 memset(&address, 0, sizeof(address));
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111 address.sin_family = AF_INET;
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112 if (TT.source_address || TT.port) {
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113 address.sin_port = SWAP_BE16(TT.port);
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114 if (TT.source_address)
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115 lookup_name(TT.source_address, (uint32_t *)&address.sin_addr);
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116 if (bind(sockfd, (struct sockaddr *)&address, sizeof(address)))
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117 perror_exit("bind");
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118 }
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119
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120 // Dial out
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121
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122 if (!CFG_NETCAT_LISTEN || !(toys.optflags&(FLAG_L|FLAG_l))) {
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123 // Figure out where to dial out to.
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124 lookup_name(*toys.optargs, (uint32_t *)&address.sin_addr);
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125 lookup_port(toys.optargs[1], &address.sin_port);
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126 temp = connect(sockfd, (struct sockaddr *)&address, sizeof(address));
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127 if (temp<0) perror_exit("connect");
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128 pollfds[0].fd = sockfd;
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129
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130 // Listen for incoming connections
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131
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132 } else {
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133 socklen_t len = sizeof(address);
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134
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135 if (listen(sockfd, 5)) error_exit("listen");
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136 if (!TT.port) {
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137 getsockname(sockfd, (struct sockaddr *)&address, &len);
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138 printf("%d\n", SWAP_BE16(address.sin_port));
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139 fflush(stdout);
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140 }
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141 // Do we need to return immediately because -l has arguments?
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142
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143 if ((toys.optflags & FLAG_l) && toys.optc) {
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144 if (fork()) goto cleanup;
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145 close(0);
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146 close(1);
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147 close(2);
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148 }
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149
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150 for (;;) {
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151 pid_t child = 0;
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152
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153 // For -l, call accept from the _new_ thread.
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154
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155 pollfds[0].fd = accept(sockfd, (struct sockaddr *)&address, &len);
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156 if (pollfds[0].fd<0) perror_exit("accept");
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157
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158 // Do we need a tty?
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159
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160 if (toys.optflags&FLAG_t)
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161 child = forkpty(&(pollfds[1].fd), NULL, NULL, NULL);
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162
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163 // Do we need to fork and/or redirect for exec?
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164
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165 else {
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166 if (toys.optflags&FLAG_L) child = fork();
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167 if (!child && toys.optc) {
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168 int fd = pollfds[0].fd;
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169
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170 if (!temp) close(sockfd);
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171 dup2(fd, 0);
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172 dup2(fd, 1);
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173 if (toys.optflags&FLAG_L) dup2(fd, 2);
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174 if (fd>2) close(fd);
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175 }
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176 }
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177
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178 if (child<0) error_msg("Fork failed\n");
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179 if (child<1) break;
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180 close(pollfds[0].fd);
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181 }
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182 }
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183 }
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184
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185 // We have a connection. Disarm timeout.
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186 // (Does not play well with -L, but what _should_ that do?)
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187 set_alarm(0);
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188
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189 if (CFG_NETCAT_LISTEN && (toys.optflags&(FLAG_L|FLAG_l) && toys.optc))
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190 xexec_optargs(0);
189
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191
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192 // Poll loop copying stdin->socket and socket->stdout.
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193 for (;;) {
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194 int i;
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195
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196 if (0>poll(pollfds, pollcount, -1)) perror_exit("poll");
189
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197
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198 for (i=0; i<pollcount; i++) {
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199 if (pollfds[i].revents & POLLIN) {
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200 int len = read(pollfds[i].fd, toybuf, sizeof(toybuf));
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201 if (len<1) goto dohupnow;
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202 xwrite(i ? pollfds[0].fd : 1, toybuf, len);
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203 } else if (pollfds[i].revents & POLLHUP) {
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204 dohupnow:
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205 // Close half-connection. This is needed for things like
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206 // "echo GET / | netcat landley.net 80"
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207 if (i) {
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208 shutdown(pollfds[0].fd, SHUT_WR);
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209 pollcount--;
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210 set_alarm(TT.quit_delay);
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211 } else goto cleanup;
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212 }
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213 }
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214 }
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215 cleanup:
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216 if (CFG_TOYBOX_FREE) {
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217 close(pollfds[0].fd);
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218 close(sockfd);
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219 }
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220 }