Mercurial > dropbear
annotate svr-tcpfwd.c @ 1549:5212630893ab
only clean libtom when using bundled libraries
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Mon, 26 Feb 2018 23:13:54 +0800 |
parents | 2c902644036d |
children | 572a7aefa188 |
rev | line source |
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74
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1 /* |
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2 * Dropbear SSH |
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3 * |
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4 * Copyright (c) 2002,2003 Matt Johnston |
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5 * Copyright (c) 2004 by Mihnea Stoenescu |
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6 * All rights reserved. |
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7 * |
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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9 * of this software and associated documentation files (the "Software"), to deal |
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10 * in the Software without restriction, including without limitation the rights |
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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12 * copies of the Software, and to permit persons to whom the Software is |
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13 * furnished to do so, subject to the following conditions: |
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14 * |
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15 * The above copyright notice and this permission notice shall be included in |
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16 * all copies or substantial portions of the Software. |
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17 * |
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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24 * SOFTWARE. */ |
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25 |
62 | 26 #include "includes.h" |
27 #include "ssh.h" | |
64 | 28 #include "tcpfwd.h" |
62 | 29 #include "dbutil.h" |
30 #include "session.h" | |
31 #include "buffer.h" | |
32 #include "packet.h" | |
33 #include "listener.h" | |
34 #include "runopts.h" | |
475
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35 #include "auth.h" |
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36 #include "netio.h" |
62 | 37 |
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38 #if !DROPBEAR_SVR_REMOTETCPFWD |
673
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39 |
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40 /* This is better than SSH_MSG_UNIMPLEMENTED */ |
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41 void recv_msg_global_request_remotetcp() { |
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42 TRACE(("recv_msg_global_request_remotetcp: remote tcp forwarding not compiled in")) |
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43 send_msg_request_failure(); |
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44 } |
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45 |
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46 /* */ |
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47 #endif /* !DROPBEAR_SVR_REMOTETCPFWD */ |
62 | 48 |
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49 static int svr_cancelremotetcp(void); |
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50 static int svr_remotetcpreq(int *allocated_listen_port); |
64 | 51 static int newtcpdirect(struct Channel * channel); |
62 | 52 |
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53 #if DROPBEAR_SVR_REMOTETCPFWD |
62 | 54 static const struct ChanType svr_chan_tcpremote = { |
55 1, /* sepfds */ | |
56 "forwarded-tcpip", | |
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57 tcp_prio_inithandler, |
62 | 58 NULL, |
59 NULL, | |
60 NULL | |
61 }; | |
62 | |
63 /* At the moment this is completely used for tcp code (with the name reflecting | |
64 * that). If new request types are added, this should be replaced with code | |
65 * similar to the request-switching in chansession.c */ | |
66 void recv_msg_global_request_remotetcp() { | |
67 | |
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68 char* reqname = NULL; |
62 | 69 unsigned int namelen; |
70 unsigned int wantreply = 0; | |
71 int ret = DROPBEAR_FAILURE; | |
72 | |
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73 TRACE(("enter recv_msg_global_request_remotetcp")) |
62 | 74 |
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75 if (svr_opts.noremotetcp || !svr_pubkey_allows_tcpfwd()) { |
165
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76 TRACE(("leave recv_msg_global_request_remotetcp: remote tcp forwarding disabled")) |
62 | 77 goto out; |
78 } | |
79 | |
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80 reqname = buf_getstring(ses.payload, &namelen); |
179
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81 wantreply = buf_getbool(ses.payload); |
62 | 82 |
267
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83 if (namelen > MAX_NAME_LEN) { |
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84 TRACE(("name len is wrong: %d", namelen)) |
62 | 85 goto out; |
86 } | |
87 | |
88 if (strcmp("tcpip-forward", reqname) == 0) { | |
1547 | 89 int allocated_listen_port = 0; |
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90 ret = svr_remotetcpreq(&allocated_listen_port); |
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91 /* client expects-port-number-to-make-use-of-server-allocated-ports */ |
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92 if (DROPBEAR_SUCCESS == ret) { |
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93 CHECKCLEARTOWRITE(); |
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94 buf_putbyte(ses.writepayload, SSH_MSG_REQUEST_SUCCESS); |
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95 buf_putint(ses.writepayload, allocated_listen_port); |
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96 encrypt_packet(); |
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97 wantreply = 0; /* avoid out: below sending another reply */ |
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98 } |
62 | 99 } else if (strcmp("cancel-tcpip-forward", reqname) == 0) { |
100 ret = svr_cancelremotetcp(); | |
101 } else { | |
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102 TRACE(("reqname isn't tcpip-forward: '%s'", reqname)) |
62 | 103 } |
104 | |
105 out: | |
106 if (wantreply) { | |
107 if (ret == DROPBEAR_SUCCESS) { | |
108 send_msg_request_success(); | |
109 } else { | |
110 send_msg_request_failure(); | |
111 } | |
112 } | |
113 | |
114 m_free(reqname); | |
115 | |
165
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116 TRACE(("leave recv_msg_global_request")) |
62 | 117 } |
118 | |
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119 static int matchtcp(const void* typedata1, const void* typedata2) { |
62 | 120 |
121 const struct TCPListener *info1 = (struct TCPListener*)typedata1; | |
122 const struct TCPListener *info2 = (struct TCPListener*)typedata2; | |
123 | |
258
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124 return (info1->listenport == info2->listenport) |
62 | 125 && (info1->chantype == info2->chantype) |
258
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126 && (strcmp(info1->listenaddr, info2->listenaddr) == 0); |
62 | 127 } |
128 | |
129 static int svr_cancelremotetcp() { | |
130 | |
131 int ret = DROPBEAR_FAILURE; | |
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132 char * bindaddr = NULL; |
62 | 133 unsigned int addrlen; |
134 unsigned int port; | |
135 struct Listener * listener = NULL; | |
136 struct TCPListener tcpinfo; | |
137 | |
165
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138 TRACE(("enter cancelremotetcp")) |
62 | 139 |
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140 bindaddr = buf_getstring(ses.payload, &addrlen); |
62 | 141 if (addrlen > MAX_IP_LEN) { |
165
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142 TRACE(("addr len too long: %d", addrlen)) |
62 | 143 goto out; |
144 } | |
145 | |
146 port = buf_getint(ses.payload); | |
147 | |
258
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148 tcpinfo.sendaddr = NULL; |
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149 tcpinfo.sendport = 0; |
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150 tcpinfo.listenaddr = bindaddr; |
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151 tcpinfo.listenport = port; |
62 | 152 listener = get_listener(CHANNEL_ID_TCPFORWARDED, &tcpinfo, matchtcp); |
153 if (listener) { | |
154 remove_listener( listener ); | |
155 ret = DROPBEAR_SUCCESS; | |
156 } | |
157 | |
158 out: | |
159 m_free(bindaddr); | |
165
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160 TRACE(("leave cancelremotetcp")) |
62 | 161 return ret; |
162 } | |
163 | |
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164 static int svr_remotetcpreq(int *allocated_listen_port) { |
62 | 165 |
166 int ret = DROPBEAR_FAILURE; | |
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167 char * request_addr = NULL; |
62 | 168 unsigned int addrlen; |
169 struct TCPListener *tcpinfo = NULL; | |
170 unsigned int port; | |
171 | |
165
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172 TRACE(("enter remotetcpreq")) |
62 | 173 |
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174 request_addr = buf_getstring(ses.payload, &addrlen); |
62 | 175 if (addrlen > MAX_IP_LEN) { |
165
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176 TRACE(("addr len too long: %d", addrlen)) |
62 | 177 goto out; |
178 } | |
179 | |
180 port = buf_getint(ses.payload); | |
181 | |
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182 if (port != 0) { |
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183 if (port < 1 || port > 65535) { |
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184 TRACE(("invalid port: %d", port)) |
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185 goto out; |
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186 } |
62 | 187 |
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188 if (!ses.allowprivport && port < IPPORT_RESERVED) { |
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189 TRACE(("can't assign port < 1024 for non-root")) |
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190 goto out; |
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191 } |
62 | 192 } |
193 | |
194 tcpinfo = (struct TCPListener*)m_malloc(sizeof(struct TCPListener)); | |
258
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195 tcpinfo->sendaddr = NULL; |
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* add -g (dbclient) and -a (dropbear) options for allowing non-local
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196 tcpinfo->sendport = 0; |
64 | 197 tcpinfo->listenport = port; |
62 | 198 tcpinfo->chantype = &svr_chan_tcpremote; |
259
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199 tcpinfo->tcp_type = forwarded; |
62 | 200 |
675
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201 tcpinfo->request_listenaddr = request_addr; |
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202 if (!opts.listen_fwd_all || (strcmp(request_addr, "localhost") == 0) ) { |
1250 | 203 /* NULL means "localhost only" */ |
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204 tcpinfo->listenaddr = NULL; |
577
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205 } |
675
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206 else |
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207 { |
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208 tcpinfo->listenaddr = m_strdup(request_addr); |
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209 } |
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210 |
62 | 211 ret = listen_tcpfwd(tcpinfo); |
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212 if (DROPBEAR_SUCCESS == ret) { |
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213 tcpinfo->listenport = get_sock_port(ses.listeners[0]->socks[0]); |
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214 *allocated_listen_port = tcpinfo->listenport; |
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215 } |
62 | 216 |
217 out: | |
218 if (ret == DROPBEAR_FAILURE) { | |
219 /* we only free it if a listener wasn't created, since the listener | |
220 * has to remember it if it's to be cancelled */ | |
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221 m_free(request_addr); |
62 | 222 m_free(tcpinfo); |
223 } | |
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224 |
165
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225 TRACE(("leave remotetcpreq")) |
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226 |
62 | 227 return ret; |
228 } | |
64 | 229 |
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230 #endif /* DROPBEAR_SVR_REMOTETCPFWD */ |
673
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231 |
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232 #if DROPBEAR_SVR_LOCALTCPFWD |
673
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233 |
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diff
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234 const struct ChanType svr_chan_tcpdirect = { |
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- Don't sent SSH_MSG_UNIMPLEMENTED if we don't have ENABLE_SVR_REMOTETCPFWD
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235 1, /* sepfds */ |
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- Don't sent SSH_MSG_UNIMPLEMENTED if we don't have ENABLE_SVR_REMOTETCPFWD
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236 "direct-tcpip", |
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237 newtcpdirect, /* init */ |
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238 NULL, /* checkclose */ |
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239 NULL, /* reqhandler */ |
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240 NULL /* closehandler */ |
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241 }; |
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- Don't sent SSH_MSG_UNIMPLEMENTED if we don't have ENABLE_SVR_REMOTETCPFWD
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diff
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242 |
64 | 243 /* Called upon creating a new direct tcp channel (ie we connect out to an |
244 * address */ | |
245 static int newtcpdirect(struct Channel * channel) { | |
246 | |
1114
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Turn many local variables into char *
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parents:
1094
diff
changeset
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247 char* desthost = NULL; |
64 | 248 unsigned int destport; |
1114
db7963049308
Turn many local variables into char *
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parents:
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diff
changeset
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249 char* orighost = NULL; |
64 | 250 unsigned int origport; |
251 char portstring[NI_MAXSERV]; | |
1094
c45d65392c1a
Fix pointer differ in signess warnings [-Werror=pointer-sign]
Gaël PORTAY <gael.portay@gmail.com>
parents:
1032
diff
changeset
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252 unsigned int len; |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
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64
diff
changeset
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253 int err = SSH_OPEN_ADMINISTRATIVELY_PROHIBITED; |
64 | 254 |
941
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Set tcp priority as follows:
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diff
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255 TRACE(("newtcpdirect channel %d", channel->index)) |
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diff
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256 |
475
52a644e7b8e1
* Patch from Frédéric Moulins adding options to authorized_keys.
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410
diff
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257 if (svr_opts.nolocaltcp || !svr_pubkey_allows_tcpfwd()) { |
165
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff
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258 TRACE(("leave newtcpdirect: local tcp forwarding disabled")) |
64 | 259 goto out; |
260 } | |
261 | |
1122
aaf576b27a10
Merge pull request #13 from gazoo74/fix-warnings
Matt Johnston <matt@ucc.asn.au>
parents:
1114
diff
changeset
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262 desthost = buf_getstring(ses.payload, &len); |
64 | 263 if (len > MAX_HOST_LEN) { |
165
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parents:
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diff
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264 TRACE(("leave newtcpdirect: desthost too long")) |
64 | 265 goto out; |
266 } | |
267 | |
268 destport = buf_getint(ses.payload); | |
269 | |
1122
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Matt Johnston <matt@ucc.asn.au>
parents:
1114
diff
changeset
|
270 orighost = buf_getstring(ses.payload, &len); |
64 | 271 if (len > MAX_HOST_LEN) { |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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156
diff
changeset
|
272 TRACE(("leave newtcpdirect: orighost too long")) |
64 | 273 goto out; |
274 } | |
275 | |
276 origport = buf_getint(ses.payload); | |
277 | |
278 /* best be sure */ | |
279 if (origport > 65535 || destport > 65535) { | |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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diff
changeset
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280 TRACE(("leave newtcpdirect: port > 65535")) |
64 | 281 goto out; |
282 } | |
283 | |
1237
888e3d17e962
Fix print format specifier
Chocobo1 <Chocobo1@users.noreply.github.com>
parents:
1122
diff
changeset
|
284 snprintf(portstring, sizeof(portstring), "%u", destport); |
1466
f787f60f8e45
bind to port as well with -b
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parents:
1465
diff
changeset
|
285 channel->conn_pending = connect_remote(desthost, portstring, channel_connect_done, channel, NULL, NULL); |
941
5daedffd0769
Set tcp priority as follows:
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diff
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|
286 |
5daedffd0769
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diff
changeset
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287 channel->prio = DROPBEAR_CHANNEL_PRIO_UNKNOWABLE; |
64 | 288 |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
64
diff
changeset
|
289 err = SSH_OPEN_IN_PROGRESS; |
64 | 290 |
291 out: | |
292 m_free(desthost); | |
293 m_free(orighost); | |
165
0cfba3034be5
Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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156
diff
changeset
|
294 TRACE(("leave newtcpdirect: err %d", err)) |
70
b0316ce64e4b
Merging in the changes from 0.41-0.43 main Dropbear tree
Matt Johnston <matt@ucc.asn.au>
parents:
64
diff
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|
295 return err; |
64 | 296 } |
297 | |
1295
750ec4ec4cbe
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Matt Johnston <matt@ucc.asn.au>
parents:
1276
diff
changeset
|
298 #endif /* DROPBEAR_SVR_LOCALTCPFWD */ |