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annotate tcpfwd-direct.c @ 9:7f77962de998

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- Reworked non-channel fd handling to listener.c - More channel cleaning up
author Matt Johnston <matt@ucc.asn.au>
date Thu, 03 Jun 2004 16:45:53 +0000
parents
children f76c9389e9e0
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>
parents:
diff changeset
1 #include "includes.h"
7f77962de998 - Reworked non-channel fd handling to listener.c
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2 #include "session.h"
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Matt Johnston <matt@ucc.asn.au>
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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"
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6
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7 #ifndef DISABLE_TCPFWD_DIRECT
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8 static int newtcpdirect(struct Channel * channel);
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9 static int newtcp(const char * host, int port);
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10
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11 const struct ChanType chan_tcpdirect = {
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12 0, /* sepfds */
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13 "direct-tcpip",
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14 newtcpdirect, /* init */
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Matt Johnston <matt@ucc.asn.au>
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15 NULL, /* checkclose */
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Matt Johnston <matt@ucc.asn.au>
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16 NULL, /* reqhandler */
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Matt Johnston <matt@ucc.asn.au>
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17 NULL /* closehandler */
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Matt Johnston <matt@ucc.asn.au>
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18 };
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19
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20
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21 /* Called upon creating a new direct tcp channel (ie we connect out to an
7f77962de998 - Reworked non-channel fd handling to listener.c
Matt Johnston <matt@ucc.asn.au>
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22 * address */
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23 static int newtcpdirect(struct Channel * channel) {
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24
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25 unsigned char* desthost = NULL;
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26 unsigned int destport;
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27 unsigned char* orighost = NULL;
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28 unsigned int origport;
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29 int sock;
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30 int len;
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31 int ret = DROPBEAR_FAILURE;
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32
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33 if (ses.opts->nolocaltcp) {
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34 TRACE(("leave newtcpdirect: local tcp forwarding disabled"));
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35 goto out;
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36 }
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37
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38 desthost = buf_getstring(ses.payload, &len);
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39 if (len > MAX_HOST_LEN) {
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40 TRACE(("leave newtcpdirect: desthost too long"));
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41 goto out;
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42 }
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43
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44 destport = buf_getint(ses.payload);
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45
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46 orighost = buf_getstring(ses.payload, &len);
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47 if (len > MAX_HOST_LEN) {
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48 TRACE(("leave newtcpdirect: orighost too long"));
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Matt Johnston <matt@ucc.asn.au>
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49 goto out;
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50 }
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51
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52 origport = buf_getint(ses.payload);
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53
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54 /* best be sure */
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55 if (origport > 65535 || destport > 65535) {
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56 TRACE(("leave newtcpdirect: port > 65535"));
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57 goto out;
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58 }
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59
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60 sock = newtcp(desthost, destport);
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61 if (sock < 0) {
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62 TRACE(("leave newtcpdirect: sock failed"));
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63 goto out;
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64 }
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65
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66 ses.maxfd = MAX(ses.maxfd, sock);
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67
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68 /* Note that infd is actually the "outgoing" direction on the
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69 * tcp connection, vice versa for outfd.
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70 * We don't set outfd, that will get set after the connection's
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71 * progress succeeds */
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72 channel->infd = sock;
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73 channel->initconn = 1;
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74
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75 ret = DROPBEAR_SUCCESS;
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76
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77 out:
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78 m_free(desthost);
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79 m_free(orighost);
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80 TRACE(("leave newtcpdirect: ret %d", ret));
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81 return ret;
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82 }
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83
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84 /* Initiate a new TCP connection - this is non-blocking, so the socket
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85 * returned will need to be checked for success when it is first written.
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86 * Similarities with OpenSSH's connect_to() are not coincidental.
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87 * Returns -1 on failure */
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88 static int newtcp(const char * host, int port) {
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89
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90 int sock = -1;
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91 char portstring[6];
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92 struct addrinfo *res = NULL, *ai;
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93 int val;
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94
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95 struct addrinfo hints;
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96
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97 TRACE(("enter newtcp"));
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98
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99 memset(&hints, 0, sizeof(hints));
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100 /* TCP, either ip4 or ip6 */
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101 hints.ai_socktype = SOCK_STREAM;
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102 hints.ai_family = PF_UNSPEC;
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103
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104 snprintf(portstring, sizeof(portstring), "%d", port);
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105 if (getaddrinfo(host, portstring, &hints, &res) != 0) {
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106 if (res) {
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107 freeaddrinfo(res);
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108 }
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109 TRACE(("leave newtcp: failed getaddrinfo"));
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110 return -1;
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Matt Johnston <matt@ucc.asn.au>
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111 }
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112
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113 /* Use the first socket that works */
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114 for (ai = res; ai != NULL; ai = ai->ai_next) {
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115
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116 if (ai->ai_family != PF_INET && ai->ai_family != PF_INET6) {
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117 continue;
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118 }
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119
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120 sock = socket(ai->ai_family, SOCK_STREAM, 0);
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121 if (sock < 0) {
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122 TRACE(("TCP socket() failed"));
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123 continue;
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124 }
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125
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126 if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) {
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127 close(sock);
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128 TRACE(("TCP non-blocking failed"));
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129 continue;
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130 }
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131
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132 /* non-blocking, so it might return without success (EINPROGRESS) */
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133 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
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134 if (errno == EINPROGRESS) {
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135 TRACE(("connect in progress"));
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Matt Johnston <matt@ucc.asn.au>
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136 } else {
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137 close(sock);
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138 TRACE(("TCP connect failed"));
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139 continue;
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Matt Johnston <matt@ucc.asn.au>
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140 }
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141 }
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Matt Johnston <matt@ucc.asn.au>
parents:
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142 break;
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Matt Johnston <matt@ucc.asn.au>
parents:
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143 }
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144
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145 freeaddrinfo(res);
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146
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parents:
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147 if (ai == NULL) {
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148 return -1;
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149 }
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150
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151 setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void*)&val, sizeof(val));
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152 return sock;
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153 }
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154 #endif /* DISABLE_TCPFWD_DIRECT */