Mercurial > dropbear

annotate tcpfwd-direct.c @ 24:469950e86d0f

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switching to global vars
author Matt Johnston <matt@ucc.asn.au>
date Tue, 20 Jul 2004 12:05:00 +0000
parents f76c9389e9e0
children 0969767bca0d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
9
7f77962de998 - Reworked non-channel fd handling to listener.c
Matt Johnston <matt@ucc.asn.au>
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diff changeset
1 #include "includes.h"
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2 #include "session.h"
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3 #include "dbutil.h"
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4 #include "channel.h"
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5 #include "tcpfwd-direct.h"
24
469950e86d0f switching to global vars
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parents: 11
diff changeset
6 #include "runopts.h"
9
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7
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8 #ifndef DISABLE_TCPFWD_DIRECT
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9 static int newtcpdirect(struct Channel * channel);
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10 static int newtcp(const char * host, int port);
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11
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12 const struct ChanType chan_tcpdirect = {
11
f76c9389e9e0 Mostly done with the listener changeover
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13 1, /* sepfds */
9
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14 "direct-tcpip",
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15 newtcpdirect, /* init */
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16 NULL, /* checkclose */
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17 NULL, /* reqhandler */
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18 NULL /* closehandler */
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19 };
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20
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21
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22 /* Called upon creating a new direct tcp channel (ie we connect out to an
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23 * address */
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24 static int newtcpdirect(struct Channel * channel) {
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25
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26 unsigned char* desthost = NULL;
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27 unsigned int destport;
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28 unsigned char* orighost = NULL;
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29 unsigned int origport;
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30 int sock;
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31 int len;
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32 int ret = DROPBEAR_FAILURE;
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33
24
469950e86d0f switching to global vars
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34 if (opts.nolocaltcp) {
9
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35 TRACE(("leave newtcpdirect: local tcp forwarding disabled"));
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36 goto out;
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37 }
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38
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39 desthost = buf_getstring(ses.payload, &len);
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40 if (len > MAX_HOST_LEN) {
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41 TRACE(("leave newtcpdirect: desthost too long"));
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42 goto out;
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43 }
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44
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45 destport = buf_getint(ses.payload);
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46
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47 orighost = buf_getstring(ses.payload, &len);
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48 if (len > MAX_HOST_LEN) {
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49 TRACE(("leave newtcpdirect: orighost too long"));
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50 goto out;
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51 }
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52
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53 origport = buf_getint(ses.payload);
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54
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55 /* best be sure */
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56 if (origport > 65535 || destport > 65535) {
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57 TRACE(("leave newtcpdirect: port > 65535"));
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58 goto out;
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59 }
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60
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61 sock = newtcp(desthost, destport);
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62 if (sock < 0) {
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63 TRACE(("leave newtcpdirect: sock failed"));
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64 goto out;
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65 }
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66
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67 ses.maxfd = MAX(ses.maxfd, sock);
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68
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69 /* Note that infd is actually the "outgoing" direction on the
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70 * tcp connection, vice versa for outfd.
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71 * We don't set outfd, that will get set after the connection's
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72 * progress succeeds */
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73 channel->infd = sock;
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74 channel->initconn = 1;
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75
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76 ret = DROPBEAR_SUCCESS;
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77
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78 out:
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79 m_free(desthost);
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80 m_free(orighost);
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81 TRACE(("leave newtcpdirect: ret %d", ret));
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82 return ret;
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83 }
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84
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85 /* Initiate a new TCP connection - this is non-blocking, so the socket
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86 * returned will need to be checked for success when it is first written.
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87 * Similarities with OpenSSH's connect_to() are not coincidental.
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88 * Returns -1 on failure */
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89 static int newtcp(const char * host, int port) {
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90
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91 int sock = -1;
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92 char portstring[6];
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93 struct addrinfo *res = NULL, *ai;
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94 int val;
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95
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96 struct addrinfo hints;
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97
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98 TRACE(("enter newtcp"));
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99
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100 memset(&hints, 0, sizeof(hints));
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101 /* TCP, either ip4 or ip6 */
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102 hints.ai_socktype = SOCK_STREAM;
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103 hints.ai_family = PF_UNSPEC;
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104
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105 snprintf(portstring, sizeof(portstring), "%d", port);
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106 if (getaddrinfo(host, portstring, &hints, &res) != 0) {
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107 if (res) {
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108 freeaddrinfo(res);
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109 }
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110 TRACE(("leave newtcp: failed getaddrinfo"));
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111 return -1;
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112 }
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113
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114 /* Use the first socket that works */
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115 for (ai = res; ai != NULL; ai = ai->ai_next) {
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116
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117 if (ai->ai_family != PF_INET && ai->ai_family != PF_INET6) {
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118 continue;
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119 }
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120
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121 sock = socket(ai->ai_family, SOCK_STREAM, 0);
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122 if (sock < 0) {
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123 TRACE(("TCP socket() failed"));
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124 continue;
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125 }
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126
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127 if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) {
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128 close(sock);
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129 TRACE(("TCP non-blocking failed"));
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130 continue;
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131 }
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132
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133 /* non-blocking, so it might return without success (EINPROGRESS) */
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134 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
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135 if (errno == EINPROGRESS) {
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136 TRACE(("connect in progress"));
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137 } else {
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138 close(sock);
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139 TRACE(("TCP connect failed"));
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140 continue;
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141 }
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142 }
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Matt Johnston <matt@ucc.asn.au>
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143 break;
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144 }
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145
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146 freeaddrinfo(res);
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147
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148 if (ai == NULL) {
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149 return -1;
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150 }
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151
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152 setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void*)&val, sizeof(val));
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153 return sock;
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154 }
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155 #endif /* DISABLE_TCPFWD_DIRECT */