1 | /* Copyright (C) 2002 by Red Hat, Incorporated. All rights reserved. |
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2 | * |
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3 | * Permission to use, copy, modify, and distribute this software |
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4 | * is freely granted, provided that this notice is preserved. |
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5 | */ |
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6 | #ifndef _NO_WORDEXP |
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7 | |
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8 | #include <sys/param.h> |
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9 | #include <sys/stat.h> |
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10 | |
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11 | #include <ctype.h> |
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12 | #include <dirent.h> |
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13 | #include <errno.h> |
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14 | #include <glob.h> |
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15 | #include <pwd.h> |
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16 | #include <stdio.h> |
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17 | #include <stdlib.h> |
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18 | #include <string.h> |
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19 | #include <unistd.h> |
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20 | #include <sys/wait.h> |
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21 | #include <sys/queue.h> |
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22 | |
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23 | #include <wordexp.h> |
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24 | #include "wordexp2.h" |
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25 | |
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26 | #define MAXLINELEN 500 |
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27 | |
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28 | /* Note: This implementation of wordexp requires a version of bash |
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29 | that supports the --wordexp and --protected arguments to be present |
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30 | on the system. It does not support the WRDE_UNDEF flag. */ |
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31 | int |
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32 | wordexp(const char *__restrict words, wordexp_t *__restrict pwordexp, int flags) |
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33 | { |
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34 | FILE *f = NULL; |
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35 | FILE *f_err = NULL; |
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36 | char tmp[MAXLINELEN]; |
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37 | int i = 0; |
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38 | int offs = 0; |
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39 | char *iter; |
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40 | pid_t pid; |
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41 | int num_words = 0; |
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42 | int num_bytes = 0; |
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43 | int fd[2]; |
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44 | int fd_err[2]; |
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45 | int err = WRDE_NOSPACE; |
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46 | ext_wordv_t *wordv = NULL; |
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47 | char *eword; |
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48 | struct ewords_entry *entry; |
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49 | |
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50 | if (pwordexp == NULL) |
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51 | { |
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52 | return WRDE_NOSPACE; |
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53 | } |
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54 | |
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55 | if (flags & WRDE_REUSE) |
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56 | wordfree(pwordexp); |
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57 | |
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58 | if ((flags & WRDE_APPEND) == 0) |
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59 | { |
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60 | pwordexp->we_wordc = 0; |
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61 | pwordexp->we_wordv = NULL; |
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62 | } |
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63 | |
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64 | if (flags & WRDE_DOOFFS) |
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65 | { |
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66 | offs = pwordexp->we_offs; |
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67 | |
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68 | if (pwordexp->we_wordv) |
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69 | wordv = WE_WORDV_TO_EXT_WORDV(pwordexp->we_wordv); |
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70 | wordv = (ext_wordv_t *)realloc(wordv, sizeof(ext_wordv_t) + (offs + pwordexp->we_wordc) * sizeof(char *)); |
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71 | if (!wordv) |
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72 | return err; |
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73 | if (!pwordexp->we_wordv) |
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74 | SLIST_INIT(&wordv->list); |
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75 | pwordexp->we_wordv = wordv->we_wordv; |
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76 | |
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77 | for (i = 0; i < offs; i++) |
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78 | pwordexp->we_wordv[i] = NULL; |
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79 | } |
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80 | |
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81 | if (pipe(fd)) |
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82 | return err; |
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83 | if (pipe(fd_err)) |
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84 | { |
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85 | close(fd[0]); |
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86 | close(fd[1]); |
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87 | return err; |
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88 | } |
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89 | pid = fork(); |
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90 | |
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91 | if (pid == -1) |
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92 | { |
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93 | /* In "parent" process, but fork failed */ |
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94 | close(fd_err[0]); |
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95 | close(fd_err[1]); |
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96 | close(fd[0]); |
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97 | close(fd[1]); |
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98 | return err; |
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99 | } |
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100 | else if (pid > 0) |
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101 | { |
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102 | /* In parent process. */ |
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103 | |
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104 | /* Close write end of parent's pipe. */ |
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105 | close(fd[1]); |
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106 | close(fd_err[1]); |
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107 | |
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108 | /* f_err is the standard error from the shell command. */ |
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109 | if (!(f_err = fdopen(fd_err[0], "r"))) |
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110 | goto cleanup; |
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111 | |
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112 | /* Check for errors. */ |
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113 | if (fgets(tmp, MAXLINELEN, f_err)) |
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114 | { |
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115 | if (strstr(tmp, "EOF")) |
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116 | err = WRDE_SYNTAX; |
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117 | else if (strstr(tmp, "`\n'") || strstr(tmp, "`|'") |
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118 | || strstr(tmp, "`&'") || strstr(tmp, "`;'") |
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119 | || strstr(tmp, "`<'") || strstr(tmp, "`>'") |
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120 | || strstr(tmp, "`('") || strstr(tmp, "`)'") |
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121 | || strstr(tmp, "`{'") || strstr(tmp, "`}'")) |
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122 | err = WRDE_BADCHAR; |
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123 | else if (strstr(tmp, "command substitution")) |
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124 | err = WRDE_CMDSUB; |
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125 | else |
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126 | err = WRDE_SYNTAX; |
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127 | |
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128 | if (flags & WRDE_SHOWERR) |
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129 | { |
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130 | fprintf(stderr, tmp); |
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131 | while(fgets(tmp, MAXLINELEN, f_err)) |
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132 | fprintf(stderr, tmp); |
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133 | } |
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134 | |
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135 | goto cleanup; |
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136 | } |
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137 | |
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138 | /* f is the standard output from the shell command. */ |
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139 | if (!(f = fdopen(fd[0], "r"))) |
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140 | goto cleanup; |
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141 | |
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142 | /* Get number of words expanded by shell. */ |
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143 | if (!fgets(tmp, MAXLINELEN, f)) |
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144 | goto cleanup; |
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145 | |
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146 | if((iter = strchr(tmp, '\n'))) |
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147 | *iter = '\0'; |
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148 | |
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149 | num_words = atoi(tmp); |
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150 | |
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151 | if (pwordexp->we_wordv) |
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152 | wordv = WE_WORDV_TO_EXT_WORDV(pwordexp->we_wordv); |
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153 | wordv = (ext_wordv_t *)realloc(wordv, sizeof(ext_wordv_t) + (offs + pwordexp->we_wordc + num_words) * sizeof(char *)); |
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154 | if (!wordv) |
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155 | return err; |
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156 | if (!pwordexp->we_wordv) |
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157 | SLIST_INIT(&wordv->list); |
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158 | pwordexp->we_wordv = wordv->we_wordv; |
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159 | |
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160 | /* Get number of bytes required for storage of all num_words words. */ |
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161 | if (!fgets(tmp, MAXLINELEN, f)) |
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162 | goto cleanup; |
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163 | |
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164 | if((iter = strchr(tmp, '\n'))) |
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165 | *iter = '\0'; |
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166 | |
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167 | num_bytes = atoi(tmp); |
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168 | |
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169 | if (!(entry = (struct ewords_entry *)malloc(sizeof(struct ewords_entry) + num_bytes + num_words))) |
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170 | goto cleanup; |
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171 | SLIST_INSERT_HEAD(&wordv->list, entry, next); |
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172 | |
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173 | /* Get expansion from the shell output. */ |
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174 | if (!fread(entry->ewords, 1, num_bytes + num_words, f)) |
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175 | goto cleanup; |
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176 | entry->ewords[num_bytes + num_words] = 0; |
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177 | |
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178 | /* Store each entry in pwordexp's we_wordv vector. */ |
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179 | eword = entry->ewords; |
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180 | for(i = 0; i < num_words; i++, eword = iter) |
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181 | { |
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182 | if (!eword) |
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183 | break; |
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184 | pwordexp->we_wordv[offs + pwordexp->we_wordc + i] = eword; |
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185 | if ((iter = strchr(eword, '\n'))) |
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186 | *iter++ = '\0'; |
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187 | } |
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188 | |
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189 | pwordexp->we_wordv[offs + pwordexp->we_wordc + i] = NULL; |
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190 | pwordexp->we_wordc += num_words; |
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191 | if (i == num_words) |
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192 | err = WRDE_SUCCESS; |
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193 | |
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194 | cleanup: |
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195 | if (f) |
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196 | fclose(f); |
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197 | else |
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198 | close(fd[0]); |
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199 | if (f_err) |
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200 | fclose(f_err); |
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201 | else |
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202 | close(fd_err[0]); |
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203 | |
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204 | /* Wait for child to finish. */ |
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205 | waitpid (pid, NULL, 0); |
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206 | |
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207 | return err; |
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208 | } |
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209 | else |
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210 | { |
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211 | /* In child process. */ |
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212 | |
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213 | /* Close read end of child's pipe. */ |
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214 | close(fd[0]); |
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215 | close(fd_err[0]); |
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216 | |
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217 | /* Pipe standard output to parent process via fd. */ |
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218 | if (fd[1] != STDOUT_FILENO) |
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219 | { |
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220 | if (dup2(fd[1], STDOUT_FILENO) == -1) |
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221 | _exit(EXIT_FAILURE); |
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222 | /* fd[1] no longer required. */ |
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223 | close(fd[1]); |
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224 | } |
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225 | |
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226 | /* Pipe standard error to parent process via fd_err. */ |
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227 | if (fd_err[1] != STDERR_FILENO) |
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228 | { |
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229 | if (dup2(fd_err[1], STDERR_FILENO) == -1) |
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230 | _exit(EXIT_FAILURE); |
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231 | /* fd_err[1] no longer required. */ |
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232 | close(fd_err[1]); |
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233 | } |
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234 | |
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235 | if (flags & WRDE_NOCMD) |
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236 | execl("/bin/bash", "bash", "--protected", "--wordexp", words, (char *)0); |
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237 | else |
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238 | execl("/bin/bash", "bash", "--wordexp", words, (char *)0); |
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239 | _exit(EXIT_FAILURE); |
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240 | } |
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241 | return WRDE_SUCCESS; |
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242 | } |
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243 | #endif /* !_NO_WORDEXP */ |
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