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annotate toys/other/netcat.c @ 1429:8c78a7e5486d draft

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Disable xopen's default O_CLOEXEC for oneit.
author Rob Landley <rob@landley.net>
date Sat, 09 Aug 2014 23:49:48 -0500
parents 85f297591693
children e127aa575ff2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 [-u] [-wpq #] [-s addr] {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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38
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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
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46 GLOBALS(
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47 char *filename; // -f read from filename instead of network
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48 long quit_delay; // -q Exit after EOF from stdin after # seconds.
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49 char *source_address; // -s Bind to a specific source address.
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50 long port; // -p Bind to a specific source port.
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51 long wait; // -w Wait # seconds for a connection.
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52 )
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53
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54 static void timeout(int signum)
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55 {
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56 if (TT.wait) error_exit("Timeout");
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57 exit(0);
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58 }
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59
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60 static void set_alarm(int seconds)
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61 {
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62 signal(SIGALRM, seconds ? timeout : SIG_DFL);
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63 alarm(seconds);
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64 }
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65
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66 // Translate x.x.x.x numeric IPv4 address, or else DNS lookup an IPv4 name.
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67 static void lookup_name(char *name, uint32_t *result)
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68 {
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69 struct hostent *hostbyname;
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70
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71 hostbyname = gethostbyname(name); // getaddrinfo
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72 if (!hostbyname) error_exit("no host '%s'", name);
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73 *result = *(uint32_t *)*hostbyname->h_addr_list;
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74 }
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75
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76 // Worry about a fancy lookup later.
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77 static void lookup_port(char *str, uint16_t *port)
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78 {
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79 *port = SWAP_BE16(atoi(str));
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80 }
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81
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82 void netcat_main(void)
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83 {
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84 int sockfd=-1, pollcount=2;
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85 struct pollfd pollfds[2];
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86
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87 memset(pollfds, 0, 2*sizeof(struct pollfd));
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88 pollfds[0].events = pollfds[1].events = POLLIN;
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89 set_alarm(TT.wait);
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90
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91 // The argument parsing logic can't make "<2" conditional on other
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92 // arguments like -f and -l, so we do it by hand here.
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93 if (toys.optflags&FLAG_f) {
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94 if (toys.optc) toys.exithelp++;
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95 } else if (!(toys.optflags&(FLAG_l|FLAG_L)) && toys.optc!=2) toys.exithelp++;
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96
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97 if (toys.exithelp) error_exit("Argument count wrong");
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98
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99 if (TT.filename) pollfds[0].fd = xopen(TT.filename, O_RDWR);
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100 else {
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101 int temp;
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102 struct sockaddr_in address;
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103
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104 // Setup socket
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105 sockfd = xsocket(AF_INET, SOCK_STREAM, 0);
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106 fcntl(sockfd, F_SETFD, FD_CLOEXEC);
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107 temp = 1;
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108 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &temp, sizeof(temp));
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109 memset(&address, 0, sizeof(address));
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110 address.sin_family = AF_INET;
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111 if (TT.source_address || TT.port) {
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112 address.sin_port = SWAP_BE16(TT.port);
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113 if (TT.source_address)
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114 lookup_name(TT.source_address, (uint32_t *)&address.sin_addr);
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115 if (bind(sockfd, (struct sockaddr *)&address, sizeof(address)))
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116 perror_exit("bind");
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117 }
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118
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119 // Dial out
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120
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121 if (!CFG_NETCAT_LISTEN || !(toys.optflags&(FLAG_L|FLAG_l))) {
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122 // Figure out where to dial out to.
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123 lookup_name(*toys.optargs, (uint32_t *)&address.sin_addr);
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124 lookup_port(toys.optargs[1], &address.sin_port);
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125 temp = connect(sockfd, (struct sockaddr *)&address, sizeof(address));
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126 if (temp<0) perror_exit("connect");
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127 pollfds[0].fd = sockfd;
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128
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129 // Listen for incoming connections
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130
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131 } else {
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132 socklen_t len = sizeof(address);
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133
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134 if (listen(sockfd, 5)) error_exit("listen");
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135 if (!TT.port) {
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136 getsockname(sockfd, (struct sockaddr *)&address, &len);
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137 printf("%d\n", SWAP_BE16(address.sin_port));
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138 fflush(stdout);
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139 }
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140 // Do we need to return immediately because -l has arguments?
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141
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142 if ((toys.optflags & FLAG_l) && toys.optc) {
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143 if (xfork()) goto cleanup;
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144 close(0);
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145 close(1);
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146 close(2);
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147 }
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148
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149 for (;;) {
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150 pid_t child = 0;
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151
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152 // For -l, call accept from the _new_ process.
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153
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154 pollfds[0].fd = accept(sockfd, (struct sockaddr *)&address, &len);
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155 if (pollfds[0].fd<0) perror_exit("accept");
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156
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157 // Do we need a tty?
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158
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159 if (toys.optflags&FLAG_t)
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160 child = forkpty(&(pollfds[1].fd), NULL, NULL, NULL);
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161
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162 // Do we need to fork and/or redirect for exec?
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163
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164 else {
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165 if (toys.optflags&FLAG_L) child = fork();
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166 if (!child && toys.optc) {
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167 int fd = pollfds[0].fd;
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168
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169 if (!temp) close(sockfd);
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170 dup2(fd, 0);
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171 dup2(fd, 1);
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172 if (toys.optflags&FLAG_L) dup2(fd, 2);
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173 if (fd>2) close(fd);
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174 }
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175 }
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176
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177 if (child<0) error_msg("Fork failed\n");
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178 if (child<1) break;
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179 close(pollfds[0].fd);
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180 }
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181 }
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182 }
189
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183
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184 // We have a connection. Disarm timeout.
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185 // (Does not play well with -L, but what _should_ that do?)
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186 set_alarm(0);
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187
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188 if (CFG_NETCAT_LISTEN && (toys.optflags&(FLAG_L|FLAG_l) && toys.optc))
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144d5ba7d410 Replace users of xexec(toys.optargs) with xexec_optargs(0) to avoid free/reuse bug during argument parsing.
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189 xexec_optargs(0);
189
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190
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191 // Poll loop copying stdin->socket and socket->stdout.
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192 for (;;) {
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193 int i;
189
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194
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195 if (0>poll(pollfds, pollcount, -1)) perror_exit("poll");
189
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196
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197 for (i=0; i<pollcount; i++) {
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198 if (pollfds[i].revents & POLLIN) {
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199 int len = read(pollfds[i].fd, toybuf, sizeof(toybuf));
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200 if (len<1) goto dohupnow;
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201 xwrite(i ? pollfds[0].fd : 1, toybuf, len);
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202 } else if (pollfds[i].revents & POLLHUP) {
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203 dohupnow:
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204 // Close half-connection. This is needed for things like
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205 // "echo GET / | netcat landley.net 80"
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206 if (i) {
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207 shutdown(pollfds[0].fd, SHUT_WR);
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208 pollcount--;
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209 set_alarm(TT.quit_delay);
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210 } else goto cleanup;
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211 }
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212 }
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213 }
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214 cleanup:
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215 if (CFG_TOYBOX_FREE) {
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216 close(pollfds[0].fd);
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217 close(sockfd);
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218 }
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219 }