Mercurial > hg > toybox
annotate toys/netcat.c @ 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.
author | Rob Landley <rob@landley.net> |
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date | Tue, 18 Nov 2008 22:17:43 -0600 |
parents | dd0b130edf6d |
children | 48e0f1f45181 |
rev | line source |
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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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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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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 |
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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 |
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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; |
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94 struct pollfd pollfds[2]; |
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95 |
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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) && toys.optc!=1) toys.exithelp++; |
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103 if (!(toys.optflags&(FLAG_l|FLAG_L)) && toys.optc!=2) toys.exithelp++; |
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104 |
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105 if (toys.exithelp) error_exit("Argument count wrong"); |
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106 |
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107 if (TT.filename) pollfds[0].fd = xopen(TT.filename, O_RDWR); |
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108 else { |
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109 int temp; |
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110 struct sockaddr_in address; |
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111 |
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112 // Setup socket |
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113 sockfd = socket(AF_INET, SOCK_STREAM, 0); |
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114 if (-1 == sockfd) perror_exit("socket"); |
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115 fcntl(sockfd, F_SETFD, FD_CLOEXEC); |
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|
116 temp = 1; |
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117 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &temp, sizeof(temp)); |
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118 memset(&address, 0, sizeof(address)); |
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|
119 address.sin_family = AF_INET; |
321
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120 if (TT.source_address || TT.port) { |
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121 address.sin_port = SWAP_BE16(TT.port); |
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122 if (TT.source_address) |
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123 lookup_name(TT.source_address, (uint32_t *)&address.sin_addr); |
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124 if (bind(sockfd, &address, sizeof(address))) |
189
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|
125 perror_exit("bind"); |
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|
126 } |
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127 |
321
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128 // Dial out |
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129 |
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130 if (!CFG_NETCAT_LISTEN || !(toys.optflags&(FLAG_L|FLAG_l))) { |
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131 // Figure out where to dial out to. |
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132 lookup_name(*toys.optargs, (uint32_t *)&address.sin_addr); |
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133 lookup_port(toys.optargs[1], &address.sin_port); |
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134 temp = connect(sockfd, (struct sockaddr *)&address, sizeof(address)); |
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135 if (temp<0) perror_exit("connect"); |
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136 pollfds[0].fd = sockfd; |
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137 |
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138 // Listen for incoming connections |
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139 |
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140 } else { |
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141 socklen_t len = sizeof(address); |
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142 |
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143 if (listen(sockfd, 5)) error_exit("listen"); |
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144 if (!TT.port) { |
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145 getsockname(sockfd, &address, &len); |
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146 printf("%d\n", SWAP_BE16(address.sin_port)); |
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147 fflush(stdout); |
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|
148 } |
322
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149 // Do we need to return immediately because -l has arguments? |
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150 |
323
dd0b130edf6d
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151 if ((toys.optflags&FLAG_l) && toys.optc) { |
322
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152 if (fork()) goto cleanup; |
323
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153 close(0); |
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154 close(1); |
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155 close(2); |
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156 } |
321
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157 |
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158 for (;;) { |
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159 pid_t child = 0; |
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160 |
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161 // For -l, call accept from the _new_ thread. |
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162 |
322
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Second attempt at making netcat -l work properly.
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163 pollfds[0].fd = accept(sockfd, (struct sockaddr *)&address, |
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|
164 &len); |
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|
165 if (pollfds[0].fd<0) perror_exit("accept"); |
321
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166 |
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167 // Do we need a tty? |
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168 |
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|
169 if (toys.optflags&FLAG_t) |
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|
170 child = forkpty(&(pollfds[1].fd), NULL, NULL, NULL); |
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|
171 |
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|
172 // Do we need to fork and/or redirect for exec? |
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173 |
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|
174 else { |
322
fa0a95ae4303
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321
diff
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|
175 if (toys.optflags&FLAG_L) child = fork(); |
321
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|
176 if (!child && toys.optc) { |
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237
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|
177 int fd = pollfds[0].fd; |
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|
178 |
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|
179 if (!temp) close(sockfd); |
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237
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|
180 dup2(fd, 0); |
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diff
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|
181 dup2(fd, 1); |
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237
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|
182 dup2(fd, 2); |
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237
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changeset
|
183 if (fd>2) close(fd); |
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237
diff
changeset
|
184 } |
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237
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changeset
|
185 } |
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237
diff
changeset
|
186 |
dfbfbaeb69c9
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237
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|
187 if (child<0) error_msg("Fork failed\n"); |
322
fa0a95ae4303
Second attempt at making netcat -l work properly.
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321
diff
changeset
|
188 if (child<1) break; |
321
dfbfbaeb69c9
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diff
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|
189 close(pollfds[0].fd); |
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237
diff
changeset
|
190 } |
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237
diff
changeset
|
191 } |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
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parents:
diff
changeset
|
192 } |
22d22427dec6
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parents:
diff
changeset
|
193 |
22d22427dec6
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|
194 // We have a connection. Disarm timeout. |
321
dfbfbaeb69c9
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237
diff
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|
195 // (Does not play well with -L, but what _should_ that do?) |
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237
diff
changeset
|
196 set_alarm(0); |
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237
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|
197 |
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237
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|
198 if (CFG_NETCAT_LISTEN && (toys.optflags&(FLAG_L|FLAG_l) && toys.optc)) { |
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237
diff
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|
199 execvp(*toys.optargs, toys.optargs); |
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237
diff
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|
200 error_exit("Exec failed"); |
189
22d22427dec6
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parents:
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changeset
|
201 } |
22d22427dec6
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parents:
diff
changeset
|
202 |
22d22427dec6
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|
203 // Poll loop copying stdin->socket and socket->stdout. |
22d22427dec6
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parents:
diff
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|
204 for (;;) { |
22d22427dec6
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parents:
diff
changeset
|
205 int i; |
22d22427dec6
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parents:
diff
changeset
|
206 |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
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parents:
diff
changeset
|
207 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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parents:
diff
changeset
|
208 |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
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parents:
diff
changeset
|
209 for (i=0; i<pollcount; i++) { |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
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parents:
diff
changeset
|
210 if (pollfds[i].revents & POLLIN) { |
22d22427dec6
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parents:
diff
changeset
|
211 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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parents:
diff
changeset
|
212 if (len<1) goto dohupnow; |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
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parents:
diff
changeset
|
213 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
|
214 } else if (pollfds[i].revents & POLLHUP) { |
189
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
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parents:
diff
changeset
|
215 dohupnow: |
321
dfbfbaeb69c9
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237
diff
changeset
|
216 // Close half-connection. This is needed for things like |
dfbfbaeb69c9
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237
diff
changeset
|
217 // "echo GET / | netcat landley.net 80" |
189
22d22427dec6
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parents:
diff
changeset
|
218 if (i) { |
22d22427dec6
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parents:
diff
changeset
|
219 shutdown(pollfds[0].fd, SHUT_WR); |
22d22427dec6
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parents:
diff
changeset
|
220 pollcount--; |
321
dfbfbaeb69c9
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237
diff
changeset
|
221 set_alarm(TT.quit_delay); |
189
22d22427dec6
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|
222 } else goto cleanup; |
22d22427dec6
Add first pass at netcat. Base applet, -f, and -w implemented.
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parents:
diff
changeset
|
223 } |
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 cleanup: |
321
dfbfbaeb69c9
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parents:
237
diff
changeset
|
227 if (CFG_TOYBOX_FREE) { |
dfbfbaeb69c9
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237
diff
changeset
|
228 close(pollfds[0].fd); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
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237
diff
changeset
|
229 close(sockfd); |
dfbfbaeb69c9
Add netcat server mode, -l, -L, and -t.
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parents:
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Add first pass at netcat. Base applet, -f, and -w implemented.
Rob Landley <rob@landley.net>
parents:
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