1 | #include <stdio.h> |
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2 | #include <stdlib.h> |
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3 | #include <ctype.h> |
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4 | #include <errno.h> |
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5 | #include <sys/types.h> |
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6 | #include <netinet/in.h> |
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7 | #include <arpa/inet.h> |
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8 | #include <limits.h> |
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9 | #include <string.h> |
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10 | #include <time.h> |
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11 | #include <unistd.h> |
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12 | #include <hesiod.h> |
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13 | |
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14 | #ifndef INADDR_NONE |
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15 | #define INADDR_NONE ((unsigned long) -1) |
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16 | #endif |
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17 | |
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18 | /* Delay attaching new packs by up to four hours. */ |
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19 | #define UPDATE_INTERVAL (3600 * 4) |
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20 | |
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21 | static void usage(void); |
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22 | static void shellenv(char **hp, char *ws_version, int bourneshell); |
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23 | static void output_var(const char *var, const char *val, int bourneshell); |
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24 | static void upper(char *v); |
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25 | static char **readcluster(FILE *f); |
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26 | static char **merge(char **l1, char **l2); |
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27 | static int vercmp(const char *v1, const char *v2); |
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28 | static void *emalloc(size_t size); |
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29 | |
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30 | /* Make a hesiod cluster query for the machine you are on and produce a |
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31 | * set of environment variable assignments for the C shell or the Bourne |
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32 | * shell, depending on the '-b' flag |
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33 | * If a localfile or a fallbackfile is specified, read cluster information |
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34 | * from it as well. Variables in localfile override varibles obtained from |
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35 | * Hesiod, and variables obtained from Hesiod override in fallbackfile. |
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36 | * "Override" means that the presence of any instances of variable "foo" |
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37 | * in one source will prevent any instances from a source being overridden. |
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38 | * Example 1: |
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39 | * localfile: lpr myprinter |
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40 | * Hesiod: syslib random-syspack-1 9.0 |
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41 | * syslib random-syspack-2 9.1 |
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42 | * syslib old-random-syspack |
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43 | * fallback: syslib normal-syspack |
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44 | * |
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45 | * lpr would be myprinter, and syslib would be negotiated among the three |
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46 | * Hesiod entries. |
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47 | * |
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48 | * Example 2: |
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49 | * localfile: lpr myprinter |
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50 | * syslib new-spiffy-syspack |
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51 | * Hesiod: syslib random-syspack-1 9.0 |
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52 | * syslib random-syspack-2 9.1 |
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53 | * syslib old-random-syspack |
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54 | * fallback: syslib normal-syspack |
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55 | * |
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56 | * lpr would be myprinter, and syslib would be new-spiffy-syspack, regardless |
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57 | * of the given version. |
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58 | * |
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59 | * |
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60 | * If any stdio errors, truncate standard output to 0 and return an exit |
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61 | * status. |
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62 | */ |
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63 | |
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64 | int main(int argc, char **argv) |
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65 | { |
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66 | char **hp, **fp, **lp, **or1, **or2; |
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67 | int debug = 0, bourneshell = 0, ch; |
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68 | char *fallbackfile = NULL, *localfile = NULL; |
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69 | FILE *f; |
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70 | void *hescontext; |
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71 | extern int optind; |
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72 | extern char *optarg; |
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73 | |
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74 | while ((ch = getopt(argc, argv, "bdl:f:")) != -1) |
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75 | { |
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76 | switch (ch) |
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77 | { |
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78 | case 'd': |
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79 | debug = 1; |
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80 | break; |
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81 | case 'b': |
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82 | bourneshell = 1; |
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83 | break; |
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84 | case 'f': |
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85 | fallbackfile = optarg; |
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86 | break; |
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87 | case 'l': |
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88 | localfile = optarg; |
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89 | break; |
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90 | default: |
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91 | usage(); |
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92 | } |
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93 | } |
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94 | argc -= optind; |
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95 | argv += optind; |
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96 | |
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97 | if (argc != 2) |
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98 | usage(); |
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99 | |
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100 | fp = NULL; |
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101 | if (fallbackfile != NULL) |
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102 | { |
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103 | f = fopen(fallbackfile, "r"); |
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104 | if (f) |
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105 | { |
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106 | fp = readcluster(f); |
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107 | fclose(f); |
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108 | } |
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109 | } |
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110 | |
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111 | lp = NULL; |
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112 | if (localfile != NULL) |
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113 | { |
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114 | f = fopen(localfile, "r"); |
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115 | if (f) |
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116 | { |
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117 | lp = readcluster(f); |
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118 | fclose(f); |
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119 | } |
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120 | } |
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121 | |
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122 | hp = NULL; |
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123 | if (debug) |
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124 | { |
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125 | /* Get clusterinfo records from standard input. */ |
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126 | hp = readcluster(stdin); |
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127 | } |
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128 | else |
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129 | { |
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130 | /* Get clusterinfo records from Hesiod. */ |
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131 | if (hesiod_init(&hescontext) != 0) |
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132 | perror("hesiod_init"); |
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133 | else |
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134 | { |
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135 | hp = hesiod_resolve(hescontext, argv[0], "cluster"); |
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136 | if (hp == NULL && errno != ENOENT) |
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137 | perror("hesiod_resolve"); |
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138 | } |
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139 | } |
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140 | |
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141 | if (hp == NULL && lp == NULL && fp == NULL) |
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142 | { |
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143 | fprintf(stderr, "No cluster information available for %s\n", argv[0]); |
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144 | return 2; |
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145 | } |
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146 | |
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147 | or1 = merge(lp, hp); |
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148 | or2 = merge(or1, fp); |
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149 | shellenv(or2, argv[1], bourneshell); |
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150 | if (!debug) |
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151 | { |
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152 | if (hp != NULL) |
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153 | hesiod_free_list(hescontext, hp); |
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154 | hesiod_end(hescontext); |
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155 | } |
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156 | /* We don't bother to free memory we know we allocated just before exiting; |
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157 | * it's not worth the trouble. */ |
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158 | return (ferror(stdout)) ? 1 : 0; |
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159 | } |
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160 | |
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161 | static char **merge(char **l1, char **l2) |
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162 | { |
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163 | int size, point, i, j, ret, sizefroml1; |
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164 | char **nl; |
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165 | char var[256], compvar[256], dummy[256]; |
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166 | |
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167 | if (l1 == NULL) |
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168 | return l2; |
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169 | if (l2 == NULL) |
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170 | return l1; |
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171 | |
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172 | size = 1; |
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173 | for (i = 0; l1[i] != NULL; i++) |
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174 | size++; |
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175 | for (i = 0; l2[i] != NULL; i++) |
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176 | size++; |
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177 | |
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178 | nl = emalloc(sizeof(char *) * size); |
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179 | point = 0; |
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180 | |
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181 | /* Copy l1 to nl. */ |
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182 | for (i = 0; l1[i] != NULL; i++) |
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183 | { |
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184 | ret = sscanf(l1[i], "%s %s", var, dummy); |
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185 | if (ret == 2) /* Ignore invalid lines. */ |
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186 | { |
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187 | nl[point] = l1[i]; |
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188 | point++; |
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189 | } |
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190 | } |
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191 | sizefroml1 = point; |
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192 | |
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193 | /* For each entry in l2, add it to nl if nothing in l1 has that var. */ |
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194 | for (i = 0; l2[i] != NULL; i++) |
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195 | { |
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196 | ret = sscanf(l2[i], "%s %s", var, dummy); |
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197 | if (ret < 2) |
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198 | continue; /* Ignore invalid lines. */ |
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199 | for (j = 0; j < sizefroml1; j++) |
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200 | { |
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201 | sscanf(nl[j], "%s", compvar); |
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202 | if (strcmp(var, compvar) == 0) |
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203 | break; |
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204 | } |
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205 | if (j == sizefroml1) |
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206 | { |
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207 | nl[point] = l2[i]; |
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208 | point++; |
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209 | } |
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210 | } |
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211 | nl[point] = NULL; |
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212 | return nl; |
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213 | } |
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214 | |
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215 | static void usage(void) |
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216 | { |
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217 | fprintf(stderr, "Usage: getcluster [-f fallbackfile] [-l localfile]" |
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218 | " [-b] [-d] hostname version\n"); |
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219 | exit(1); |
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220 | } |
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221 | |
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222 | /* Cluster records will come in entries of the form: |
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223 | * |
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224 | * variable value [version [flags]] |
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225 | * |
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226 | * There may be multiple records for the same variable, but not |
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227 | * multiple entries with the same variable and version. There may be |
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228 | * at most one entry for a given variable that does not list a |
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229 | * version. |
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230 | * |
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231 | * Discard records if they have a version greater than the current |
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232 | * workstation version and any of the following is true: |
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233 | * - They have 't' listed in the flags. |
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234 | * - AUTOUPDATE is false. |
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235 | * - The environment variable UPDATE_TIME doesn't exist or |
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236 | * specifies a time later than the current time. |
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237 | * Set NEW_TESTING_RELEASE if any records are discarded for the first |
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238 | * reason, NEW_PRODUCTION_RELEASE if any records are discarded for |
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239 | * the second reason, and UPDATE_TIME if any entries specify a version |
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240 | * greater than the current workstation version and are not discarded |
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241 | * for the first two reasons. |
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242 | * |
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243 | * After discarding records, output the variable definition with the |
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244 | * highest version number. If there aren't any records left with |
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245 | * version numbers and there's one with no version number, output |
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246 | * that one. */ |
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247 | static void shellenv(char **hp, char *ws_version, int bourneshell) |
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248 | { |
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249 | int *seen, count, i, j, output_time = 0, autoupdate = 0; |
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250 | char var[80], val[80], vers[80], flags[80], compvar[80], compval[80]; |
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251 | char compvers[80], defaultval[80], new_production[80], new_testing[80]; |
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252 | char timebuf[32], *envp; |
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253 | time_t update_time = -1, now; |
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254 | unsigned long ip = INADDR_NONE; |
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255 | |
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256 | time(&now); |
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257 | |
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258 | /* Gather information from the environment. UPDATE_TIME comes from |
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259 | * the clusterinfo file we wrote out last time; AUTOUPDATE and ADDR |
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260 | * come from rc.conf. If neither file has been sourced by the |
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261 | * caller, we just use defaults. */ |
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262 | envp = getenv("UPDATE_TIME"); |
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263 | if (envp) |
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264 | update_time = atoi(envp); |
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265 | envp = getenv("AUTOUPDATE"); |
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266 | if (envp && strcmp(envp, "true") == 0) |
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267 | autoupdate = 1; |
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268 | envp = getenv("ADDR"); |
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269 | if (envp) |
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270 | ip = inet_addr(envp); |
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271 | |
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272 | count = 0; |
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273 | while (hp[count]) |
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274 | count++; |
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275 | |
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276 | seen = (int *) calloc(count, sizeof(int)); |
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277 | if (seen == NULL) |
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278 | exit(1); |
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279 | |
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280 | strcpy(new_production, "0.0"); |
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281 | strcpy(new_testing, "0.0"); |
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282 | |
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283 | /* The outer loop is for the purpose of "considering each variable." |
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284 | * We skip entries for variables which had a previous entry. */ |
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285 | for (i = 0; i < count; i++) |
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286 | { |
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287 | if (seen[i]) |
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288 | continue; |
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289 | sscanf(hp[i], "%s", var); |
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290 | |
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291 | /* Consider each entry for this variable (including hp[i]). */ |
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292 | strcpy(vers, "0.0"); |
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293 | *defaultval = 0; |
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294 | for (j = i; j < count; j++) |
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295 | { |
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296 | *compvers = *flags = 0; |
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297 | sscanf(hp[j], "%s %s %s %s", compvar, compval, compvers, flags); |
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298 | if (strcmp(compvar, var) != 0) |
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299 | continue; |
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300 | seen[j] = 1; |
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301 | |
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302 | /* If there's no version, keep this as the default value in |
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303 | * case we don't come up with anything else to print. If |
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304 | * there is a version, discard it if it doesn't match the |
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305 | * current workstation version and (a) we're not autoupdate, |
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306 | * or (b) it's a testing version. If we do consider the |
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307 | * entry, and its version is greater than the current best |
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308 | * version we have, update the current best version and its |
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309 | * value. */ |
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310 | if (!*compvers) |
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311 | strcpy(defaultval, compval); |
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312 | else if (((autoupdate && !strchr(flags, 't')) || |
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313 | (vercmp(compvers, ws_version) == 0))) |
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314 | { |
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315 | if (vercmp(compvers, ws_version) > 0) |
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316 | { |
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317 | /* We want to take this value, but not necessarily |
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318 | * right away. Accept the record only if we have an |
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319 | * update time which has already passed. Make |
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320 | * a note that we should output the time |
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321 | * whether or not we discard the entry, since the |
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322 | * workstation is out of date either way. */ |
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323 | output_time = 1; |
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324 | if (update_time == -1 || now < update_time) |
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325 | continue; |
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326 | } |
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327 | |
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328 | if (vercmp(compvers, vers) >= 0) |
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329 | { |
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330 | strcpy(val, compval); |
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331 | strcpy(vers, compvers); |
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332 | } |
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333 | } |
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334 | else |
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335 | { |
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336 | /* Discard this entry, but record most recent testing and |
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337 | * production releases. */ |
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338 | if (strchr(flags, 't') && vercmp(compvers, new_testing) > 0) |
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339 | strcpy(new_testing, compvers); |
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340 | if (!strchr(flags, 't') && vercmp(compvers, new_production) > 0) |
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341 | strcpy(new_production, compvers); |
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342 | } |
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343 | } |
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344 | if (*vers != '0' || *defaultval) |
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345 | { |
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346 | if (*vers == '0') |
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347 | strcpy(val, defaultval); |
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348 | upper(var); |
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349 | output_var(var, val, bourneshell); |
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350 | } |
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351 | } |
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352 | |
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353 | if (vercmp(new_testing, ws_version) > 0) |
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354 | output_var("NEW_TESTING_RELEASE", new_testing, bourneshell); |
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355 | if (vercmp(new_production, ws_version) > 0) |
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356 | output_var("NEW_PRODUCTION_RELEASE", new_production, bourneshell); |
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357 | if (output_time) |
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358 | { |
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359 | /* If we have no time from the environment, make up one |
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360 | * between now and UPDATE_INTERVAL seconds in the future. */ |
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361 | if (update_time == -1) |
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362 | { |
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363 | srand(ntohl(ip)); |
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364 | update_time = now + rand() % UPDATE_INTERVAL; |
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365 | } |
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366 | sprintf(timebuf, "%lu", update_time); |
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367 | output_var("UPDATE_TIME", timebuf, bourneshell); |
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368 | } |
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369 | free(seen); |
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370 | } |
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371 | |
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372 | static void output_var(const char *var, const char *val, int bourneshell) |
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373 | { |
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374 | if (bourneshell) |
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375 | printf("%s=%s ; export %s ;\n", var, val, var); |
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376 | else |
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377 | printf("setenv %s %s ;\n", var, val); |
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378 | } |
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379 | |
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380 | static void upper(char *v) |
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381 | { |
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382 | while(*v) |
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383 | { |
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384 | *v = toupper(*v); |
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385 | v++; |
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386 | } |
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387 | } |
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388 | |
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389 | static int vercmp(const char *v1, const char *v2) |
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390 | { |
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391 | int major1 = 0, minor1 = 0, major2 =0, minor2 = 0; |
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392 | |
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393 | sscanf(v1, "%d.%d", &major1, &minor1); |
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394 | sscanf(v2, "%d.%d", &major2, &minor2); |
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395 | return (major1 != major2) ? (major1 - major2) : (minor1 - minor2); |
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396 | } |
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397 | |
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398 | static char **readcluster(FILE *f) |
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399 | { |
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400 | char line[1024]; |
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401 | char **lp; |
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402 | int nl, al; |
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403 | |
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404 | nl = 0; |
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405 | al = 10; |
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406 | lp = emalloc(al * sizeof(char *)); |
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407 | |
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408 | lp[0] = NULL; |
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409 | while (fgets(line, 1024, f) != NULL) |
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410 | { |
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411 | if (nl + 1 == al) |
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412 | { |
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413 | al = al * 2; |
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414 | lp = realloc(lp, al * sizeof(char *)); |
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415 | if (lp == NULL) |
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416 | { |
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417 | fprintf(stderr, "Out of memory."); |
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418 | exit(1); |
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419 | } |
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420 | } |
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421 | lp[nl] = strdup(line); |
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422 | if (lp[nl] == NULL) |
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423 | { |
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424 | fprintf(stderr, "Out of memory."); |
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425 | exit(1); |
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426 | } |
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427 | nl++; |
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428 | } |
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429 | lp[nl] = NULL; |
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430 | |
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431 | return lp; |
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432 | } |
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433 | |
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434 | static void *emalloc(size_t size) |
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435 | { |
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436 | void *p; |
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437 | |
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438 | p = malloc(size); |
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439 | if (p == NULL) |
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440 | { |
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441 | fprintf(stderr, "Out of memory.\n"); |
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442 | exit(1); |
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443 | } |
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444 | return p; |
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445 | } |
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