Mercurial > hg > mercurial-crew-with-dirclash
annotate contrib/hgsh/hgsh.c @ 2697:6c540dd14c38
mq: qpop should act like quilt pop
qpop patchname would pop the named patch off the stack. This is slightly
different from how quilt pop works. quilt pop pops everything up to the
named patch.
author | Chris Mason <mason@suse.com> |
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date | Thu, 27 Jul 2006 09:27:39 -0700 |
parents | 9cbeef33eaa3 |
children | 59ddd43f609f |
rev | line source |
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1 /* |
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2 * hgsh.c - restricted login shell for mercurial |
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3 * |
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4 * Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com> |
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5 * |
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6 * This software may be used and distributed according to the terms of the |
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7 * GNU General Public License, incorporated herein by reference. |
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8 * |
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9 * this program is login shell for dedicated mercurial user account. it |
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10 * only allows few actions: |
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11 * |
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12 * 1. run hg in server mode on specific repository. no other hg commands |
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13 * are allowed. we try to verify that repo to be accessed exists under |
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14 * given top-level directory. |
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15 * |
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16 * 2. (optional) forward ssh connection from firewall/gateway machine to |
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17 * "real" mercurial host, to let users outside intranet pull and push |
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18 * changes through firewall. |
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19 * |
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20 * 3. (optional) run normal shell, to allow to "su" to mercurial user, use |
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21 * "sudo" to run programs as that user, or run cron jobs as that user. |
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22 * |
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23 * only tested on linux yet. patches for non-linux systems welcome. |
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24 */ |
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25 |
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26 #ifndef _GNU_SOURCE |
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27 #define _GNU_SOURCE /* for asprintf */ |
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28 #endif |
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29 |
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30 #include <stdio.h> |
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31 #include <stdlib.h> |
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32 #include <string.h> |
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33 #include <sys/stat.h> |
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34 #include <sys/types.h> |
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35 #include <sysexits.h> |
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36 #include <unistd.h> |
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37 |
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38 /* |
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39 * user config. |
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40 * |
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41 * if you see a hostname below, just use first part of hostname. example, |
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42 * if you have host named foo.bar.com, use "foo". |
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43 */ |
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44 |
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45 /* |
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46 * HG_GATEWAY: hostname of gateway/firewall machine that people outside your |
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47 * intranet ssh into if they need to ssh to other machines. if you do not |
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48 * have such machine, set to NULL. |
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49 */ |
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50 #ifndef HG_GATEWAY |
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51 #define HG_GATEWAY "gateway" |
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52 #endif |
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53 |
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54 /* |
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55 * HG_HOST: hostname of mercurial server. if any machine is allowed, set to |
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56 * NULL. |
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57 */ |
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58 #ifndef HG_HOST |
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59 #define HG_HOST "mercurial" |
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60 #endif |
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61 |
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62 /* |
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63 * HG_USER: username to log in from HG_GATEWAY to HG_HOST. if gateway and |
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64 * host username are same, set to NULL. |
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65 */ |
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66 #ifndef HG_USER |
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67 #define HG_USER "hg" |
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68 #endif |
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69 |
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70 /* |
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71 * HG_ROOT: root of tree full of mercurial repos. if you do not want to |
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72 * validate location of repo when someone is try to access, set to NULL. |
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73 */ |
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74 #ifndef HG_ROOT |
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75 #define HG_ROOT "/home/hg/repos" |
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76 #endif |
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77 |
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78 /* |
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79 * HG: path to the mercurial executable to run. |
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80 */ |
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81 #ifndef HG |
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82 #define HG "/home/hg/bin/hg" |
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83 #endif |
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84 |
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85 /* |
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86 * HG_SHELL: shell to use for actions like "sudo" and "su" access to |
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87 * mercurial user, and cron jobs. if you want to make these things |
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88 * impossible, set to NULL. |
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89 */ |
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90 #ifndef HG_SHELL |
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91 #define HG_SHELL NULL |
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92 // #define HG_SHELL "/bin/bash" |
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93 #endif |
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94 |
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95 /* |
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96 * HG_HELP: some way for users to get support if they have problem. if they |
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97 * should not get helpful message, set to NULL. |
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98 */ |
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99 #ifndef HG_HELP |
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100 #define HG_HELP "please contact support@example.com for help." |
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101 #endif |
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102 |
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103 /* |
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104 * SSH: path to ssh executable to run, if forwarding from HG_GATEWAY to |
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105 * HG_HOST. if you want to use rsh instead (why?), you need to modify |
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106 * arguments it is called with. see forward_through_gateway. |
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107 */ |
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108 #ifndef SSH |
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109 #define SSH "/usr/bin/ssh" |
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110 #endif |
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111 |
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112 /* |
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113 * tell whether to print command that is to be executed. useful for |
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114 * debugging. should not interfere with mercurial operation, since |
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115 * mercurial only cares about stdin and stdout, and this prints to stderr. |
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116 */ |
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117 static const int debug = 0; |
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118 |
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119 static void print_cmdline(int argc, char **argv) |
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120 { |
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121 FILE *fp = stderr; |
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122 int i; |
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123 |
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124 fputs("command: ", fp); |
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125 |
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126 for (i = 0; i < argc; i++) { |
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127 char *spc = strpbrk(argv[i], " \t\r\n"); |
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128 if (spc) { |
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129 fputc('\'', fp); |
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130 } |
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131 fputs(argv[i], fp); |
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132 if (spc) { |
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133 fputc('\'', fp); |
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134 } |
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135 if (i < argc - 1) { |
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136 fputc(' ', fp); |
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137 } |
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138 } |
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139 fputc('\n', fp); |
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140 fflush(fp); |
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141 } |
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142 |
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143 static void usage(const char *reason, int exitcode) |
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144 { |
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145 char *hg_help = HG_HELP; |
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146 |
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147 if (reason) { |
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148 fprintf(stderr, "*** Error: %s.\n", reason); |
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149 } |
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150 fprintf(stderr, "*** This program has been invoked incorrectly.\n"); |
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151 if (hg_help) { |
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152 fprintf(stderr, "*** %s\n", hg_help); |
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153 } |
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154 exit(exitcode ? exitcode : EX_USAGE); |
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155 } |
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156 |
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157 /* |
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158 * run on gateway host to make another ssh connection, to "real" mercurial |
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159 * server. it sends its command line unmodified to far end. |
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160 * |
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161 * never called if HG_GATEWAY is NULL. |
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162 */ |
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163 static void forward_through_gateway(int argc, char **argv) |
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164 { |
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165 char *ssh = SSH; |
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166 char *hg_host = HG_HOST; |
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167 char *hg_user = HG_USER; |
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168 char **nargv = alloca((10 + argc) * sizeof(char *)); |
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169 int i = 0, j; |
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170 |
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171 nargv[i++] = ssh; |
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172 nargv[i++] = "-q"; |
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173 nargv[i++] = "-T"; |
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174 nargv[i++] = "-x"; |
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175 if (hg_user) { |
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176 nargv[i++] = "-l"; |
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177 nargv[i++] = hg_user; |
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178 } |
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179 nargv[i++] = hg_host; |
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180 |
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181 /* |
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182 * sshd called us with added "-c", because it thinks we are a shell. |
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183 * drop it if we find it. |
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184 */ |
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185 j = 1; |
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186 if (j < argc && strcmp(argv[j], "-c") == 0) { |
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187 j++; |
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188 } |
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189 |
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190 for (; j < argc; i++, j++) { |
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191 nargv[i] = argv[j]; |
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192 } |
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193 nargv[i] = NULL; |
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194 |
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195 if (debug) { |
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196 print_cmdline(i, nargv); |
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197 } |
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198 |
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199 execv(ssh, nargv); |
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200 perror(ssh); |
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201 exit(EX_UNAVAILABLE); |
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202 } |
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203 |
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204 /* |
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205 * run shell. let administrator "su" to mercurial user's account to do |
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206 * administrative works. |
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207 * |
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208 * never called if HG_SHELL is NULL. |
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209 */ |
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210 static void run_shell(int argc, char **argv) |
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211 { |
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212 char *hg_shell = HG_SHELL; |
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213 char **nargv; |
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214 char *c; |
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215 int i; |
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216 |
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217 nargv = alloca((argc + 3) * sizeof(char *)); |
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218 c = strrchr(hg_shell, '/'); |
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219 |
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220 /* tell "real" shell it is login shell, if needed. */ |
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221 |
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222 if (argv[0][0] == '-' && c) { |
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223 nargv[0] = strdup(c); |
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224 if (nargv[0] == NULL) { |
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225 perror("malloc"); |
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226 exit(EX_OSERR); |
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227 } |
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228 nargv[0][0] = '-'; |
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229 } else { |
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230 nargv[0] = hg_shell; |
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231 } |
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232 |
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233 for (i = 1; i < argc; i++) { |
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234 nargv[i] = argv[i]; |
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235 } |
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236 nargv[i] = NULL; |
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237 |
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238 if (debug) { |
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239 print_cmdline(i, nargv); |
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240 } |
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241 |
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242 execv(hg_shell, nargv); |
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243 perror(hg_shell); |
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244 exit(EX_OSFILE); |
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245 } |
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246 |
2602
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247 enum cmdline { |
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248 hg_init, |
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249 hg_serve, |
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250 }; |
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251 |
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252 |
2341
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253 /* |
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254 * paranoid wrapper, runs hg executable in server mode. |
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255 */ |
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256 static void serve_data(int argc, char **argv) |
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257 { |
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258 char *hg_root = HG_ROOT; |
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259 char *repo, *repo_root; |
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260 enum cmdline cmd; |
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261 char *nargv[6]; |
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262 struct stat st; |
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263 size_t repolen; |
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264 int i; |
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265 |
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266 /* |
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267 * check argv for looking okay. we should be invoked with argv |
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268 * resembling like this: |
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269 * |
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270 * hgsh |
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271 * -c |
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272 * hg -R some/path serve --stdio |
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273 * |
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274 * the "-c" is added by sshd, because it thinks we are login shell. |
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275 */ |
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276 |
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277 if (argc != 3) { |
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278 goto badargs; |
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279 } |
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280 |
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281 if (strcmp(argv[1], "-c") != 0) { |
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282 goto badargs; |
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283 } |
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284 |
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285 if (sscanf(argv[2], "hg init %as", &repo) == 1) { |
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286 cmd = hg_init; |
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287 } |
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288 else if (sscanf(argv[2], "hg -R %as serve --stdio", &repo) == 1) { |
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289 cmd = hg_serve; |
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290 } else { |
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291 goto badargs; |
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292 } |
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293 |
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294 repolen = repo ? strlen(repo) : 0; |
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295 |
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296 if (repolen == 0) { |
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297 goto badargs; |
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298 } |
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299 |
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300 if (hg_root) { |
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301 if (asprintf(&repo_root, "%s/%s/", hg_root, repo) == -1) { |
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302 goto badargs; |
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303 } |
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304 |
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305 /* |
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306 * attempt to stop break out from inside the repository tree. could |
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307 * do something more clever here, because e.g. we could traverse a |
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308 * symlink that looks safe, but really breaks us out of tree. |
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309 */ |
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310 |
2602
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311 if (strstr(repo_root, "/../") != NULL) { |
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312 goto badargs; |
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|
313 } |
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314 |
2602
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315 /* only hg init expects no repo. */ |
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316 |
2602
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317 if (cmd != hg_init) { |
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318 char *abs_path; |
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319 |
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320 if (asprintf(&abs_path, "%s.hg/data", repo_root) == -1) { |
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321 goto badargs; |
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322 } |
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323 |
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324 /* verify that we really are looking at valid repo. */ |
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325 |
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326 if (stat(abs_path, &st) == -1) { |
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327 perror(repo); |
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328 exit(EX_DATAERR); |
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329 } |
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330 } |
2341
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331 |
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332 if (chdir(hg_root) == -1) { |
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333 perror(hg_root); |
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|
334 exit(EX_SOFTWARE); |
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|
335 } |
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parents:
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|
336 } |
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|
337 |
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338 i = 0; |
2602
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339 |
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340 switch (cmd) { |
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341 case hg_serve: |
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342 nargv[i++] = HG; |
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343 nargv[i++] = "-R"; |
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344 nargv[i++] = repo; |
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345 nargv[i++] = "serve"; |
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346 nargv[i++] = "--stdio"; |
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347 break; |
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348 case hg_init: |
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349 nargv[i++] = HG; |
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350 nargv[i++] = "init"; |
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351 nargv[i++] = repo; |
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352 break; |
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|
353 } |
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|
354 |
2341
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355 nargv[i] = NULL; |
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|
356 |
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|
357 if (debug) { |
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358 print_cmdline(i, nargv); |
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|
359 } |
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parents:
diff
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|
360 |
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|
361 execv(HG, nargv); |
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|
362 perror(HG); |
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parents:
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|
363 exit(EX_UNAVAILABLE); |
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diff
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|
364 |
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parents:
diff
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|
365 badargs: |
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|
366 /* print useless error message. */ |
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|
367 |
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368 usage("invalid arguments", EX_DATAERR); |
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|
369 } |
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Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff
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|
370 |
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|
371 int main(int argc, char **argv) |
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|
372 { |
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parents:
diff
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|
373 char host[1024]; |
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parents:
diff
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|
374 char *c; |
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375 |
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376 if (gethostname(host, sizeof(host)) == -1) { |
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377 perror("gethostname"); |
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378 exit(EX_OSERR); |
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379 } |
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380 |
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381 if ((c = strchr(host, '.')) != NULL) { |
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382 *c = '\0'; |
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383 } |
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384 |
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385 if (getenv("SSH_CLIENT")) { |
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386 char *hg_gateway = HG_GATEWAY; |
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387 char *hg_host = HG_HOST; |
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388 |
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389 if (hg_gateway && strcmp(host, hg_gateway) == 0) { |
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390 forward_through_gateway(argc, argv); |
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391 } |
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392 |
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393 if (hg_host && strcmp(host, hg_host) != 0) { |
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394 usage("invoked on unexpected host", EX_USAGE); |
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395 } |
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396 |
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397 serve_data(argc, argv); |
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398 } else if (HG_SHELL) { |
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399 run_shell(argc, argv); |
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400 } else { |
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401 usage("invalid arguments", EX_DATAERR); |
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402 } |
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403 |
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404 return 0; |
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405 } |