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annotate toys/netcat.c @ 532:d44eb064da41

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Silence a couple pointless warnings.
author Rob Landley <rob@landley.net>
date Wed, 07 Mar 2012 19:00:21 -0600
parents 48e0f1f45181
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
233
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * nc: mini-netcat - Forward stdin/stdout to a file or network connection.
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4 *
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5 * Copyright 2007 Rob Landley <rob@landley.net>
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30a6db5a95c2 Add comments about SUSv3 specs (or lack thereof).
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6 *
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7 * Not in SUSv3.
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8
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9 USE_NETCAT(OLDTOY(nc, netcat, USE_NETCAT_LISTEN("tl^L^")"w#p#s:q#f:", TOYFLAG_BIN))
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10 USE_NETCAT(NEWTOY(netcat, USE_NETCAT_LISTEN("tl^L^")"w#p#s:q#f:", TOYFLAG_BIN))
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163498bf547b Move NEWTOY() list from end of toylist.h to generated/newtoys.h.
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11
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12 config NETCAT
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13 bool "netcat"
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14 default y
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15 help
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16 usage: netcat [-wpq #] [-s addr] {IPADDR PORTNUM|-f FILENAME|-let} [-e COMMAND]
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17
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18 -w SECONDS timeout for connection
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19 -p local port number
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20 -s local ipv4 address
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21 -q SECONDS quit this many seconds after EOF on stdin.
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22 -f use FILENAME (ala /dev/ttyS0) instead of network
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23
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24 Use "stty 115200 -F /dev/ttyS0 && stty raw -echo -ctlecho" with
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25 netcat -f to connect to a serial port.
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26
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27
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28 config NETCAT_LISTEN
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29 bool "netcat sever options (-let)"
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30 default y
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31 depends on NETCAT
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32 help
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33 -t allocate tty (must come before -l or -L)
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34 -l listen for one incoming connection.
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35 -L listen for multiple incoming connections (server mode).
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36
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37 Any additional command line arguments after -l or -L are executed
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38 to handle each incoming connection. If none, the connection is
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39 forwarded to stdin/stdout.
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40
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41 For a quick-and-dirty server, try something like:
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42 netcat -s 127.0.0.1 -p 1234 -tL /bin/bash -l
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43 */
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44
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45 #include "toys.h"
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46 #include "toynet.h"
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47
237
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48 DEFINE_GLOBALS(
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49 char *filename; // -f read from filename instead of network
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50 long quit_delay; // -q Exit after EOF from stdin after # seconds.
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51 char *source_address; // -s Bind to a specific source address.
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52 long port; // -p Bind to a specific source port.
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53 long wait; // -w Wait # seconds for a connection.
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54 )
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55
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56 #define TT this.netcat
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57
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58 #define FLAG_f 1
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59 #define FLAG_L 32
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60 #define FLAG_l 64
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61 #define FLAG_t 128
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62
189
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63 static void timeout(int signum)
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64 {
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65 if (TT.wait) error_exit("Timeout");
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66 exit(0);
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67 }
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68
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69 static void set_alarm(int seconds)
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70 {
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71 signal(SIGALRM, seconds ? timeout : SIG_DFL);
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72 alarm(seconds);
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73 }
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74
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75 // Translate x.x.x.x numeric IPv4 address, or else DNS lookup an IPv4 name.
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76 static void lookup_name(char *name, uint32_t *result)
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77 {
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78 struct hostent *hostbyname;
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79
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80 hostbyname = gethostbyname(name);
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81 if (!hostbyname) error_exit("no host '%s'", name);
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82 *result = *(uint32_t *)*hostbyname->h_addr_list;
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83 }
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84
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85 // Worry about a fancy lookup later.
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86 static void lookup_port(char *str, uint16_t *port)
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87 {
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88 *port = SWAP_BE16(atoi(str));
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89 }
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90
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91 void netcat_main(void)
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92 {
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93 int sockfd=-1, pollcount=2;
189
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94 struct pollfd pollfds[2];
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95
324
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96 memset(pollfds, 0, 2*sizeof(struct pollfd));
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97 pollfds[0].events = pollfds[1].events = POLLIN;
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98 set_alarm(TT.wait);
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99
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100 // The argument parsing logic can't make "<2" conditional on other
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101 // arguments like -f and -l, so we do it by hand here.
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102 if (toys.optflags&FLAG_f) {
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103 if (toys.optc) toys.exithelp++;
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104 } else if (!(toys.optflags&(FLAG_l|FLAG_L)) && toys.optc!=2) toys.exithelp++;
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105
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106 if (toys.exithelp) error_exit("Argument count wrong");
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107
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108 if (TT.filename) pollfds[0].fd = xopen(TT.filename, O_RDWR);
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109 else {
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110 int temp;
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111 struct sockaddr_in address;
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112
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113 // Setup socket
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114 sockfd = socket(AF_INET, SOCK_STREAM, 0);
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115 if (-1 == sockfd) perror_exit("socket");
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116 fcntl(sockfd, F_SETFD, FD_CLOEXEC);
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117 temp = 1;
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118 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &temp, sizeof(temp));
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119 memset(&address, 0, sizeof(address));
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120 address.sin_family = AF_INET;
321
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121 if (TT.source_address || TT.port) {
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122 address.sin_port = SWAP_BE16(TT.port);
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123 if (TT.source_address)
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124 lookup_name(TT.source_address, (uint32_t *)&address.sin_addr);
532
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125 if (bind(sockfd, (struct sockaddr *)&address, sizeof(address)))
189
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126 perror_exit("bind");
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127 }
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128
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129 // Dial out
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130
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131 if (!CFG_NETCAT_LISTEN || !(toys.optflags&(FLAG_L|FLAG_l))) {
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
132 // Figure out where to dial out to.
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
133 lookup_name(*toys.optargs, (uint32_t *)&address.sin_addr);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
134 lookup_port(toys.optargs[1], &address.sin_port);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
135 temp = connect(sockfd, (struct sockaddr *)&address, sizeof(address));
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
136 if (temp<0) perror_exit("connect");
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
137 pollfds[0].fd = sockfd;
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
138
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
139 // Listen for incoming connections
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
140
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
141 } else {
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
142 socklen_t len = sizeof(address);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
143
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
144 if (listen(sockfd, 5)) error_exit("listen");
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
145 if (!TT.port) {
532
d44eb064da41 Silence a couple pointless warnings.
Rob Landley <rob@landley.net>
parents: 328
diff changeset
146 getsockname(sockfd, (struct sockaddr *)&address, &len);
321
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
147 printf("%d\n", SWAP_BE16(address.sin_port));
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
148 fflush(stdout);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
149 }
322
fa0a95ae4303 Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents: 321
diff changeset
150 // Do we need to return immediately because -l has arguments?
fa0a95ae4303 Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents: 321
diff changeset
151
323
dd0b130edf6d Shell $(netcat) won't return unless child's stdin/stdout/stderr are closed.
Rob Landley <rob@landley.net>
parents: 322
diff changeset
152 if ((toys.optflags&FLAG_l) && toys.optc) {
322
fa0a95ae4303 Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents: 321
diff changeset
153 if (fork()) goto cleanup;
323
dd0b130edf6d Shell $(netcat) won't return unless child's stdin/stdout/stderr are closed.
Rob Landley <rob@landley.net>
parents: 322
diff changeset
154 close(0);
dd0b130edf6d Shell $(netcat) won't return unless child's stdin/stdout/stderr are closed.
Rob Landley <rob@landley.net>
parents: 322
diff changeset
155 close(1);
dd0b130edf6d Shell $(netcat) won't return unless child's stdin/stdout/stderr are closed.
Rob Landley <rob@landley.net>
parents: 322
diff changeset
156 close(2);
dd0b130edf6d Shell $(netcat) won't return unless child's stdin/stdout/stderr are closed.
Rob Landley <rob@landley.net>
parents: 322
diff changeset
157 }
321
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
158
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
159 for (;;) {
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
160 pid_t child = 0;
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
161
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
162 // For -l, call accept from the _new_ thread.
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
163
322
fa0a95ae4303 Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents: 321
diff changeset
164 pollfds[0].fd = accept(sockfd, (struct sockaddr *)&address,
fa0a95ae4303 Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents: 321
diff changeset
165 &len);
fa0a95ae4303 Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents: 321
diff changeset
166 if (pollfds[0].fd<0) perror_exit("accept");
321
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
167
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
168 // Do we need a tty?
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
169
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
170 if (toys.optflags&FLAG_t)
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
171 child = forkpty(&(pollfds[1].fd), NULL, NULL, NULL);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
172
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
173 // Do we need to fork and/or redirect for exec?
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
174
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
175 else {
322
fa0a95ae4303 Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents: 321
diff changeset
176 if (toys.optflags&FLAG_L) child = fork();
321
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
177 if (!child && toys.optc) {
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
178 int fd = pollfds[0].fd;
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
179
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
180 if (!temp) close(sockfd);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
181 dup2(fd, 0);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
182 dup2(fd, 1);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
183 dup2(fd, 2);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
184 if (fd>2) close(fd);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
185 }
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
186 }
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
187
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
188 if (child<0) error_msg("Fork failed\n");
322
fa0a95ae4303 Second attempt at making netcat -l work properly.
Rob Landley <rob@landley.net>
parents: 321
diff changeset
189 if (child<1) break;
321
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
190 close(pollfds[0].fd);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
191 }
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
192 }
189
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
193 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
194
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
195 // We have a connection. Disarm timeout.
321
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
196 // (Does not play well with -L, but what _should_ that do?)
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
197 set_alarm(0);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
198
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
199 if (CFG_NETCAT_LISTEN && (toys.optflags&(FLAG_L|FLAG_l) && toys.optc)) {
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
200 execvp(*toys.optargs, toys.optargs);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
201 error_exit("Exec failed");
189
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
202 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
203
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
204 // Poll loop copying stdin->socket and socket->stdout.
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
205 for (;;) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
206 int i;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
207
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
208 if (0>poll(pollfds, pollcount, -1)) perror_exit("poll");
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
209
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
210 for (i=0; i<pollcount; i++) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
211 if (pollfds[i].revents & POLLIN) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
212 int len = read(pollfds[i].fd, toybuf, sizeof(toybuf));
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
213 if (len<1) goto dohupnow;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
214 xwrite(i ? pollfds[0].fd : 1, toybuf, len);
324
50c8afc263ee More than 4k of input can be queued up in a pipe, so loop needs to continue reading until POLLIN is exhausted before acknowledging POLLHUP.
Rob Landley <rob@landley.net>
parents: 323
diff changeset
215 } else if (pollfds[i].revents & POLLHUP) {
189
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
216 dohupnow:
321
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
217 // Close half-connection. This is needed for things like
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
218 // "echo GET / | netcat landley.net 80"
189
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
219 if (i) {
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
220 shutdown(pollfds[0].fd, SHUT_WR);
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
221 pollcount--;
321
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
222 set_alarm(TT.quit_delay);
189
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
223 } else goto cleanup;
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
224 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
225 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
226 }
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
227 cleanup:
321
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
228 if (CFG_TOYBOX_FREE) {
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
229 close(pollfds[0].fd);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
230 close(sockfd);
dfbfbaeb69c9 Add netcat server mode, -l, -L, and -t.
Rob Landley <rob@landley.net>
parents: 237
diff changeset
231 }
189
22d22427dec6 Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
diff changeset
232 }