1 | /* Created by: Robert French |
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2 | * |
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3 | * $Source: /afs/dev.mit.edu/source/repository/athena/bin/attach/attach.c,v $ |
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4 | * $Author: probe $ |
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5 | * |
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6 | * Copyright (c) 1988 by the Massachusetts Institute of Technology. |
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7 | */ |
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8 | |
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9 | #ifndef lint |
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10 | static char rcsid_attach_c[] = "$Header: /afs/dev.mit.edu/source/repository/athena/bin/attach/attach.c,v 1.17 1992-01-27 03:10:43 probe Exp $"; |
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11 | #endif |
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12 | |
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13 | #include "attach.h" |
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14 | #include <signal.h> |
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15 | |
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16 | extern int mul_attach(); |
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17 | |
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18 | /* |
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19 | * Attempt to attach a filesystem. Lookup the name with Hesiod as |
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20 | * necessary, and try all possible results in order. Also handles |
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21 | * the explicit flag for explicitly defined hostname/directory |
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22 | * arguments. Branches to NFS or RVD attach routines as necessary. |
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23 | */ |
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24 | |
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25 | attach(name) |
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26 | const char *name; |
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27 | { |
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28 | struct _attachtab at, *atp; |
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29 | char **hes; |
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30 | int i; |
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31 | int print_wait; |
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32 | extern int caught_signal; |
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33 | |
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34 | hes = build_hesiod_line(name); |
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35 | |
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36 | if (!hes || !*hes) { |
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37 | error_status = ERR_ATTACHBADFILSYS; |
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38 | return (FAILURE); |
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39 | } |
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40 | |
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41 | if (lookup || debug_flag) { |
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42 | printf("%s resolves to:\n", name); |
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43 | for (i=0;hes[i];i++) |
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44 | printf("%s\n", hes[i]); |
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45 | putchar('\n'); |
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46 | } |
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47 | |
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48 | if (lookup) |
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49 | return(SUCCESS); |
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50 | |
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51 | print_wait = 2; |
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52 | retry: |
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53 | lock_attachtab(); |
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54 | get_attachtab(); |
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55 | if (atp = attachtab_lookup(name)) { |
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56 | switch (atp->status) { |
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57 | case STATUS_ATTACHING: |
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58 | if (!force && really_in_use(name)) { |
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59 | unlock_attachtab(); |
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60 | free_attachtab(); |
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61 | if (print_path) { |
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62 | sleep(print_wait); /* Wait a few seconds */ |
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63 | if (print_wait < 30) |
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64 | print_wait *= 2; |
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65 | goto retry; |
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66 | } |
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67 | fprintf(stderr, |
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68 | "%s: Filesystem \"%s\" already being attached by another process\n", |
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69 | progname, name); |
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70 | error_status = ERR_ATTACHINUSE; |
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71 | return (FAILURE); |
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72 | } |
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73 | attachtab_delete(atp); |
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74 | put_attachtab(); |
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75 | break; |
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76 | case STATUS_DETACHING: |
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77 | if (!force && really_in_use(name)) { |
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78 | fprintf(stderr, "%s: Filesystem \"%s\" is being detached by another process\n", |
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79 | progname, name); |
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80 | error_status = ERR_ATTACHINUSE; |
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81 | unlock_attachtab(); |
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82 | free_attachtab(); |
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83 | return (FAILURE); |
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84 | } |
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85 | attachtab_delete(atp); |
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86 | put_attachtab(); |
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87 | break; |
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88 | case STATUS_ATTACHED: |
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89 | if (force) |
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90 | break; |
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91 | if (lock_filesystem) |
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92 | atp->flags |= FLAG_LOCKED; |
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93 | if (owner_list) |
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94 | add_an_owner(atp,owner_uid); |
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95 | if (owner_list || lock_filesystem) |
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96 | put_attachtab(); |
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97 | unlock_attachtab(); |
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98 | |
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99 | if (atp->fs->type == TYPE_MUL) |
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100 | return mul_attach(atp, (struct mntopts *)0, 0); |
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101 | |
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102 | if (print_path) |
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103 | printf("%s\n", atp->mntpt); |
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104 | else if(verbose) |
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105 | printf("%s: Filesystem \"%s\" is already attached", progname, name); |
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106 | #ifdef NFS |
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107 | if (map_anyway && atp->mode != 'n' && atp->fs->type == TYPE_NFS) { |
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108 | int ret; |
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109 | if (verbose && !print_path) |
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110 | printf(" (mapping)\n"); |
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111 | |
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112 | ret = nfsid(atp->host, atp->hostaddr[0], |
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113 | MOUNTPROC_KUIDMAP, 1, name, 1, real_uid); |
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114 | if(atp->mode != 'm') |
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115 | return ret; |
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116 | if (ret == FAILURE) |
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117 | { |
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118 | error_status = 0; |
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119 | clear_errored(atp->hostaddr[0]); |
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120 | } |
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121 | return SUCCESS; |
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122 | } |
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123 | #endif |
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124 | #ifdef AFS |
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125 | if (map_anyway && atp->mode != 'n' && atp->fs->type == TYPE_AFS) { |
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126 | if (verbose && !print_path) |
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127 | printf(" (authenticating)\n"); |
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128 | return(afs_auth(atp->hesiodname, atp->hostdir)); |
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129 | } |
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130 | #endif |
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131 | if (verbose && !print_path) |
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132 | putchar('\n'); |
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133 | /* No error code set on already attached */ |
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134 | free_attachtab(); |
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135 | return (FAILURE); |
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136 | } |
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137 | } |
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138 | |
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139 | /* Note: attachtab is still locked at this point */ |
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140 | |
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141 | /* We don't really care about ANY of the values besides status */ |
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142 | at.status = STATUS_ATTACHING; |
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143 | at.explicit = explicit; |
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144 | at.fs = NULL; |
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145 | strcpy(at.hesiodname, name); |
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146 | strcpy(at.host, "?"); |
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147 | strcpy(at.hostdir, "?"); |
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148 | bzero((char *)&at.hostaddr, sizeof(at.hostaddr)); |
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149 | at.rmdir = 0; |
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150 | at.drivenum = 0; |
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151 | at.mode = 'r'; |
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152 | at.flags = 0; |
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153 | at.nowners = 1; |
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154 | at.owners[0] = owner_uid; |
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155 | strcpy(at.mntpt, "?"); |
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156 | |
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157 | /* |
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158 | * Mark the filsys as "being attached". |
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159 | */ |
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160 | start_critical_code(); /* Don't let us be interrupted */ |
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161 | mark_in_use(name); |
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162 | attachtab_append(&at); |
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163 | put_attachtab(); |
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164 | unlock_attachtab(); |
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165 | |
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166 | for (i=0;hes[i];i++) { |
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167 | if (debug_flag) |
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168 | printf("Processing line %s\n", hes[i]); |
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169 | if (caught_signal) { |
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170 | if (debug_flag) |
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171 | printf("Caught signal; cleaning up attachtab....\n"); |
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172 | free_attachtab(); |
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173 | lock_attachtab(); |
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174 | get_attachtab(); |
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175 | attachtab_delete(attachtab_lookup(at.hesiodname)); |
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176 | put_attachtab(); |
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177 | unlock_attachtab(); |
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178 | free_attachtab(); |
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179 | terminate_program(); |
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180 | } |
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181 | /* |
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182 | * Note try_attach will change attachtab appropriately if |
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183 | * successful. |
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184 | */ |
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185 | if (try_attach(name, hes[i], !hes[i+1]) == SUCCESS) { |
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186 | free_attachtab(); |
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187 | mark_in_use(NULL); |
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188 | end_critical_code(); |
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189 | return (SUCCESS); |
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190 | } |
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191 | } |
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192 | free_attachtab(); |
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193 | |
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194 | if (error_status == ERR_ATTACHNOTALLOWED) |
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195 | fprintf(stderr, "%s: You are not allowed to attach %s.\n", |
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196 | progname, name); |
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197 | |
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198 | if (error_status == ERR_ATTACHBADMNTPT) |
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199 | fprintf(stderr, |
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200 | "%s: You are not allowed to attach a filesystem here\n", |
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201 | progname); |
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202 | /* |
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203 | * We've failed -- delete the partial entry and unlock the in-use file. |
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204 | */ |
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205 | lock_attachtab(); |
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206 | get_attachtab(); |
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207 | attachtab_delete(attachtab_lookup(at.hesiodname)); |
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208 | put_attachtab(); |
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209 | mark_in_use(NULL); |
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210 | unlock_attachtab(); |
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211 | free_attachtab(); |
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212 | end_critical_code(); |
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213 | |
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214 | /* Assume error code already set by whatever made us fail */ |
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215 | return (FAILURE); |
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216 | } |
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217 | |
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218 | /* |
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219 | * Given a Hesiod line and a filesystem name, try to attach it. If |
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220 | * successful, change the attachtab accordingly. |
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221 | */ |
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222 | |
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223 | try_attach(name, hesline, errorout) |
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224 | char *name, *hesline; |
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225 | int errorout; |
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226 | { |
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227 | struct _attachtab at, *atp; |
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228 | int status; |
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229 | int attach_suid; |
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230 | #ifdef ZEPHYR |
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231 | char instbfr[BUFSIZ]; |
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232 | #endif |
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233 | struct mntopts mopt; |
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234 | char *default_options; |
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235 | |
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236 | if (parse_hes(hesline, &at, name)) { |
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237 | error_status = ERR_BADFSDSC; |
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238 | return(FAILURE); |
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239 | } |
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240 | if (filsys_type && *filsys_type && strcasecmp(filsys_type, at.fs->name)) { |
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241 | error_status = ERR_ATTACHBADFILSYS; |
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242 | return FAILURE; |
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243 | } |
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244 | if (!override && !allow_filsys(name, at.fs->type)) { |
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245 | error_status = ERR_ATTACHNOTALLOWED; |
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246 | return(FAILURE); |
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247 | } |
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248 | |
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249 | at.status = STATUS_ATTACHING; |
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250 | at.explicit = explicit; |
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251 | strcpy(at.hesiodname, name); |
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252 | add_an_owner(&at, owner_uid); |
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253 | |
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254 | if (mntpt) |
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255 | strcpy(at.mntpt, mntpt); |
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256 | |
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257 | /* |
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258 | * Note if a filesystem does nothave AT_FS_MNTPT_CANON as a property, |
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259 | * it must also somehow call check_mntpt, if it wants mountpoint |
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260 | * checking to happen at all. |
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261 | */ |
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262 | if (at.fs->flags & AT_FS_MNTPT_CANON) { |
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263 | char *path; |
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264 | |
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265 | /* Perform path canonicalization */ |
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266 | if ((path = path_canon(at.mntpt)) == NULL) { |
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267 | fprintf(stderr, "%s: Cannot get information about the mountpoint %s\n", |
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268 | at.hesiodname, at.mntpt); |
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269 | error_status = ERR_SOMETHING; |
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270 | return(FAILURE); |
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271 | } |
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272 | strcpy(at.mntpt, path); |
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273 | if (debug_flag) |
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274 | printf("Mountpoint canonicalized as: %s\n", at.mntpt); |
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275 | if (!override && !check_mountpt(at.mntpt, at.fs->type)) { |
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276 | error_status = ERR_ATTACHBADMNTPT; |
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277 | return(FAILURE); |
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278 | } |
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279 | } |
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280 | |
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281 | if (at.fs->flags & AT_FS_MNTPT && (atp=attachtab_lookup_mntpt(at.mntpt))) { |
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282 | fprintf(stderr,"%s: Filesystem %s is already mounted on %s\n", |
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283 | at.hesiodname, atp->hesiodname, at.mntpt); |
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284 | error_status = ERR_ATTACHDIRINUSE; |
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285 | return(FAILURE); |
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286 | } |
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287 | |
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288 | if (override_mode) |
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289 | at.mode = override_mode; |
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290 | |
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291 | if (override_suid == -1) |
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292 | attach_suid = !nosetuid_filsys(name, at.fs->type); |
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293 | else |
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294 | attach_suid = override_suid; |
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295 | at.flags = (attach_suid ? 0 : FLAG_NOSETUID) + |
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296 | (lock_filesystem ? FLAG_LOCKED : 0); |
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297 | |
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298 | /* Prepare mount options structure */ |
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299 | bzero(&mopt, sizeof(mopt)); |
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300 | mopt.type = at.fs->mount_type; |
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301 | |
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302 | /* Read in default options */ |
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303 | default_options = filsys_options(at.hesiodname, at.fs->type); |
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304 | add_options(&mopt, "soft"); /* Soft by default */ |
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305 | if (mount_options && *mount_options) |
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306 | add_options(&mopt, mount_options); |
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307 | if (default_options && *default_options) |
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308 | add_options(&mopt, default_options); |
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309 | |
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310 | if (at.mode == 'r') |
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311 | add_options(&mopt, "ro"); |
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312 | if (at.flags & FLAG_NOSETUID) |
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313 | add_options(&mopt, "nosuid"); |
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314 | |
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315 | if (at.fs->attach) { |
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316 | if (at.fs->flags & AT_FS_MNTPT) { |
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317 | if (make_mntpt(&at) == FAILURE) { |
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318 | rm_mntpt(&at); |
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319 | return (FAILURE); |
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320 | } |
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321 | } |
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322 | status = (at.fs->attach)(&at, &mopt, errorout); |
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323 | } else { |
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324 | fprintf(stderr, |
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325 | "%s: Can't attach filesystem type \"%s\"\n", |
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326 | progname, at.fs->name); |
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327 | status = ERR_FATAL; |
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328 | return(FAILURE); |
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329 | } |
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330 | |
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331 | if (status == SUCCESS) { |
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332 | char tmp[BUFSIZ]; |
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333 | if (at.fs->flags & AT_FS_REMOTE) |
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334 | sprintf(tmp, "%s:%s", at.host, at.hostdir); |
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335 | else |
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336 | strcpy(tmp, at.hostdir); |
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337 | if (verbose) |
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338 | if(at.fs->type == TYPE_AFS) |
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339 | printf("%s: %s linked to %s for filesystem %s\n", progname, |
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340 | tmp, at.mntpt, at.hesiodname); |
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341 | else |
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342 | printf("%s: filesystem %s (%s) mounted on %s (%s)\n", |
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343 | progname, at.hesiodname, tmp, |
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344 | at.mntpt, (mopt.flags & M_RDONLY) ? "read-only" : |
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345 | "read-write"); |
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346 | if (print_path) |
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347 | printf("%s\n", at.mntpt); |
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348 | at.status = STATUS_ATTACHED; |
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349 | lock_attachtab(); |
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350 | get_attachtab(); |
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351 | attachtab_replace(&at); |
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352 | put_attachtab(); |
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353 | unlock_attachtab(); |
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354 | /* |
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355 | * Do Zephyr stuff as necessary |
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356 | */ |
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357 | #ifdef ZEPHYR |
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358 | if (use_zephyr && at.fs->flags & AT_FS_REMOTE) { |
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359 | if(at.fs->type == TYPE_AFS) { |
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360 | afs_zinit(at.hesiodname, at.hostdir); |
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361 | } else { |
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362 | sprintf(instbfr, "%s:%s", at.host, at.hostdir); |
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363 | zephyr_addsub(instbfr); |
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364 | zephyr_addsub(at.host); |
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365 | } |
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366 | } |
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367 | #endif |
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368 | free_attachtab(); |
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369 | } else |
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370 | if (at.fs->flags & AT_FS_MNTPT) |
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371 | rm_mntpt(&at); |
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372 | return (status); |
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373 | } |
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374 | |
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375 | |
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376 | char *attach_list_format = "%-22s %-22s %c%-18s%s\n"; |
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377 | |
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378 | int attach_print(host) |
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379 | char *host; |
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380 | { |
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381 | static int print_banner = 1; |
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382 | struct _attachtab *atp; |
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383 | extern struct _attachtab *attachtab_first; |
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384 | char optstr[40]; |
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385 | int bad = 0; |
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386 | int i; |
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387 | |
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388 | lock_attachtab(); |
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389 | get_attachtab(); |
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390 | unlock_attachtab(); |
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391 | atp = attachtab_first; |
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392 | if (!atp) { |
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393 | printf("No filesystems currently attached.\n"); |
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394 | free_attachtab(); |
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395 | return(ERR_NONE); |
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396 | } |
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397 | if (print_banner) { |
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398 | printf(attach_list_format, "filesystem", "mountpoint", |
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399 | ' ', "user", "mode"); |
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400 | printf(attach_list_format, "----------", "----------", |
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401 | ' ', "----", "----"); |
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402 | print_banner = 0; |
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403 | } |
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404 | while (atp) { |
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405 | optstr[0] = atp->mode; |
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406 | optstr[1] = '\0'; |
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407 | if (atp->flags & FLAG_NOSETUID) |
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408 | strcat(optstr, ",nosuid"); |
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409 | if (atp->flags & FLAG_LOCKED) |
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410 | strcat(optstr, ",locked"); |
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411 | if (atp->flags & FLAG_PERMANENT) |
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412 | strcat(optstr, ",perm"); |
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413 | if (host) { |
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414 | bad = 1; |
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415 | for (i=0; i<MAXHOSTS && atp->hostaddr[i].s_addr; i++) { |
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416 | if (host_compare(host, inet_ntoa(atp->hostaddr[i]))) { |
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417 | bad = 0; |
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418 | break; |
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419 | } |
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420 | } |
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421 | } |
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422 | if (!bad && atp->status == STATUS_ATTACHED) { |
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423 | printf(attach_list_format, atp->hesiodname, |
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424 | (atp->fs->type&TYPE_MUL) ? "-" : atp->mntpt, |
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425 | atp->flags & FLAG_ANYONE ? '*' : ' ', |
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426 | ownerlist(atp), optstr); |
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427 | } |
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428 | atp = atp->next; |
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429 | } |
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430 | free_attachtab(); |
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431 | return (ERR_NONE); |
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432 | } |
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