Mercurial > hg > toybox
annotate toys/other/netcat.c @ 1727:c0ef9b7976f0 draft
Use xsignal() instead of signal().
author | Rob Landley <rob@landley.net> |
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date | Tue, 10 Mar 2015 11:07:28 -0500 |
parents | cbb1aca81eca |
children | 57f2a26fa92c |
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, TOYFLAG_BIN)) |
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8 USE_NETCAT(NEWTOY(netcat, USE_NETCAT_LISTEN("^tlL")"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 |
1196 | 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 // This should be xexit() but would need siglongjmp()... |
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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 xsignal(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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99 |
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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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104 |
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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 (xfork()) 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_ process. |
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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 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 } |
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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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189 xexec(toys.optargs); |
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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; |
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194 |
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195 if (0>poll(pollfds, pollcount, -1)) perror_exit("poll"); |
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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 } |