1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini xargs implementation for busybox
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4 | * Options are supported: "-prtx -n max_arg -s max_chars -e[ouf_str]"
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5 | *
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6 | * (C) 2002,2003 by Vladimir Oleynik <dzo@simtreas.ru>
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7 | *
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8 | * Special thanks
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9 | * - Mark Whitley and Glenn McGrath for stimulus to rewrite :)
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10 | * - Mike Rendell <michael@cs.mun.ca>
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11 | * and David MacKenzie <djm@gnu.ai.mit.edu>.
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12 | *
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13 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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14 | *
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15 | * xargs is described in the Single Unix Specification v3 at
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16 | * http://www.opengroup.org/onlinepubs/007904975/utilities/xargs.html
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17 | *
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18 | */
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19 |
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20 | #include "busybox.h"
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21 | #include <stdio.h>
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22 | #include <stdlib.h>
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23 | #include <string.h>
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24 | #include <unistd.h>
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25 | #include <getopt.h>
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26 | #include <errno.h>
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27 | #include <fcntl.h>
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28 | #include <sys/types.h>
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29 | #include <sys/wait.h>
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30 |
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31 | /* COMPAT: SYSV version defaults size (and has a max value of) to 470.
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32 | We try to make it as large as possible. */
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33 | #if !defined(ARG_MAX) && defined(_SC_ARG_MAX)
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34 | #define ARG_MAX sysconf (_SC_ARG_MAX)
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35 | #endif
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36 | #ifndef ARG_MAX
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37 | #define ARG_MAX 470
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38 | #endif
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39 |
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40 |
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41 | #ifdef TEST
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42 | # ifndef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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43 | # define CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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44 | # endif
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45 | # ifndef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
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46 | # define CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
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47 | # endif
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48 | # ifndef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
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49 | # define CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
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50 | # endif
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51 | # ifndef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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52 | # define CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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53 | # endif
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54 | #endif
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55 |
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56 | /*
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57 | This function have special algorithm.
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58 | Don`t use fork and include to main!
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59 | */
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60 | static int xargs_exec(char *const *args)
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61 | {
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62 | pid_t p;
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63 | volatile int exec_errno = 0; /* shared vfork stack */
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64 |
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65 | if ((p = vfork()) >= 0) {
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66 | if (p == 0) {
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67 | /* vfork -- child */
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68 | execvp(args[0], args);
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69 | exec_errno = errno; /* set error to shared stack */
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70 | _exit(1);
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71 | } else {
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72 | /* vfork -- parent */
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73 | int status;
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74 |
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75 | while (wait(&status) == (pid_t) - 1)
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76 | if (errno != EINTR)
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77 | break;
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78 | if (exec_errno) {
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79 | errno = exec_errno;
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80 | bb_perror_msg("%s", args[0]);
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81 | return exec_errno == ENOENT ? 127 : 126;
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82 | } else {
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83 | if (WEXITSTATUS(status) == 255) {
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84 | bb_error_msg("%s: exited with status 255; aborting", args[0]);
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85 | return 124;
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86 | }
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87 | if (WIFSTOPPED(status)) {
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88 | bb_error_msg("%s: stopped by signal %d",
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89 | args[0], WSTOPSIG(status));
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90 | return 125;
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91 | }
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92 | if (WIFSIGNALED(status)) {
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93 | bb_error_msg("%s: terminated by signal %d",
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94 | args[0], WTERMSIG(status));
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95 | return 125;
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96 | }
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97 | if (WEXITSTATUS(status) != 0)
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98 | return 123;
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99 | return 0;
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100 | }
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101 | }
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102 | } else {
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103 | bb_perror_msg_and_die("vfork");
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104 | }
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105 | }
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106 |
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107 |
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108 | typedef struct xlist_s {
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109 | char *data;
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110 | size_t lenght;
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111 | struct xlist_s *link;
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112 | } xlist_t;
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113 |
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114 | static int eof_stdin_detected;
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115 |
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116 | #define ISBLANK(c) ((c) == ' ' || (c) == '\t')
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117 | #define ISSPACE(c) (ISBLANK (c) || (c) == '\n' || (c) == '\r' \
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118 | || (c) == '\f' || (c) == '\v')
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119 |
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120 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
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121 | static xlist_t *process_stdin(xlist_t * list_arg,
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122 | const char *eof_str, size_t mc, char *buf)
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123 | {
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124 | #define NORM 0
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125 | #define QUOTE 1
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126 | #define BACKSLASH 2
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127 | #define SPACE 4
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128 |
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129 | char *s = NULL; /* start word */
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130 | char *p = NULL; /* pointer to end word */
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131 | char q = 0; /* quote char */
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132 | char state = NORM;
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133 | char eof_str_detected = 0;
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134 | size_t line_l = 0; /* size loaded args line */
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135 | int c; /* current char */
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136 | xlist_t *cur;
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137 | xlist_t *prev;
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138 |
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139 | for (prev = cur = list_arg; cur; cur = cur->link) {
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140 | line_l += cur->lenght; /* previous allocated */
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141 | if (prev != cur)
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142 | prev = prev->link;
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143 | }
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144 |
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145 | while (!eof_stdin_detected) {
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146 | c = getchar();
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147 | if (c == EOF) {
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148 | eof_stdin_detected++;
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149 | if (s)
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150 | goto unexpected_eof;
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151 | break;
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152 | }
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153 | if (eof_str_detected)
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154 | continue;
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155 | if (state == BACKSLASH) {
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156 | state = NORM;
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157 | goto set;
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158 | } else if (state == QUOTE) {
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159 | if (c == q) {
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160 | q = 0;
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161 | state = NORM;
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162 | } else {
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163 | goto set;
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164 | }
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165 | } else { /* if(state == NORM) */
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166 |
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167 | if (ISSPACE(c)) {
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168 | if (s) {
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169 | unexpected_eof:
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170 | state = SPACE;
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171 | c = 0;
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172 | goto set;
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173 | }
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174 | } else {
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175 | if (s == NULL)
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176 | s = p = buf;
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177 | if (c == '\\') {
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178 | state = BACKSLASH;
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179 | } else if (c == '\'' || c == '"') {
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180 | q = c;
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181 | state = QUOTE;
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182 | } else {
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183 | set:
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184 | if ((size_t)(p - buf) >= mc)
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185 | bb_error_msg_and_die("argument line too long");
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186 | *p++ = c;
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187 | }
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188 | }
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189 | }
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190 | if (state == SPACE) { /* word's delimiter or EOF detected */
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191 | if (q) {
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192 | bb_error_msg_and_die("unmatched %s quote",
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193 | q == '\'' ? "single" : "double");
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194 | }
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195 | /* word loaded */
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196 | if (eof_str) {
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197 | eof_str_detected = strcmp(s, eof_str) == 0;
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198 | }
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199 | if (!eof_str_detected) {
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200 | size_t lenght = (p - buf);
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201 |
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202 | cur = xmalloc(sizeof(xlist_t) + lenght);
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203 | cur->data = memcpy(cur + 1, s, lenght);
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204 | cur->lenght = lenght;
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205 | cur->link = NULL;
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206 | if (prev == NULL) {
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207 | list_arg = cur;
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208 | } else {
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209 | prev->link = cur;
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210 | }
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211 | prev = cur;
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212 | line_l += lenght;
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213 | if (line_l > mc) {
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214 | /* stop memory usage :-) */
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215 | break;
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216 | }
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217 | }
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218 | s = NULL;
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219 | state = NORM;
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220 | }
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221 | }
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222 | return list_arg;
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223 | }
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224 | #else
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225 | /* The variant does not support single quotes, double quotes or backslash */
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226 | static xlist_t *process_stdin(xlist_t * list_arg,
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227 | const char *eof_str, size_t mc, char *buf)
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228 | {
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229 |
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230 | int c; /* current char */
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231 | int eof_str_detected = 0;
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232 | char *s = NULL; /* start word */
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233 | char *p = NULL; /* pointer to end word */
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234 | size_t line_l = 0; /* size loaded args line */
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235 | xlist_t *cur;
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236 | xlist_t *prev;
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237 |
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238 | for (prev = cur = list_arg; cur; cur = cur->link) {
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239 | line_l += cur->lenght; /* previous allocated */
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240 | if (prev != cur)
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241 | prev = prev->link;
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242 | }
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243 |
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244 | while (!eof_stdin_detected) {
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245 | c = getchar();
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246 | if (c == EOF) {
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247 | eof_stdin_detected++;
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248 | }
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249 | if (eof_str_detected)
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250 | continue;
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251 | if (c == EOF || ISSPACE(c)) {
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252 | if (s == NULL)
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253 | continue;
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254 | c = EOF;
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255 | }
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256 | if (s == NULL)
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257 | s = p = buf;
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258 | if ((p - buf) >= mc)
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259 | bb_error_msg_and_die("argument line too long");
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260 | *p++ = c == EOF ? 0 : c;
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261 | if (c == EOF) { /* word's delimiter or EOF detected */
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262 | /* word loaded */
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263 | if (eof_str) {
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264 | eof_str_detected = strcmp(s, eof_str) == 0;
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265 | }
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266 | if (!eof_str_detected) {
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267 | size_t lenght = (p - buf);
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268 |
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269 | cur = xmalloc(sizeof(xlist_t) + lenght);
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270 | cur->data = memcpy(cur + 1, s, lenght);
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271 | cur->lenght = lenght;
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272 | cur->link = NULL;
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273 | if (prev == NULL) {
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274 | list_arg = cur;
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275 | } else {
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276 | prev->link = cur;
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277 | }
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278 | prev = cur;
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279 | line_l += lenght;
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280 | if (line_l > mc) {
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281 | /* stop memory usage :-) */
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282 | break;
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283 | }
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284 | s = NULL;
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285 | }
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286 | }
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287 | }
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288 | return list_arg;
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289 | }
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290 | #endif /* CONFIG_FEATURE_XARGS_SUPPORT_QUOTES */
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291 |
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292 |
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293 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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294 | /* Prompt the user for a response, and
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295 | if the user responds affirmatively, return true;
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296 | otherwise, return false. Used "/dev/tty", not stdin. */
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297 | static int xargs_ask_confirmation(void)
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298 | {
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299 | static FILE *tty_stream;
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300 | int c, savec;
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301 |
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302 | if (!tty_stream) {
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303 | tty_stream = bb_xfopen(CURRENT_TTY, "r");
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304 | /* pranoidal security by vodz */
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305 | fcntl(fileno(tty_stream), F_SETFD, FD_CLOEXEC);
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306 | }
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307 | fputs(" ?...", stderr);
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308 | fflush(stderr);
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309 | c = savec = getc(tty_stream);
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310 | while (c != EOF && c != '\n')
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311 | c = getc(tty_stream);
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312 | if (savec == 'y' || savec == 'Y')
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313 | return 1;
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314 | return 0;
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315 | }
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316 |
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317 | # define OPT_INC_P 1
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318 | #else
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319 | # define OPT_INC_P 0
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320 | # define xargs_ask_confirmation() 1
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321 | #endif /* CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION */
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322 |
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323 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
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324 | # define OPT_INC_X 1
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325 | #else
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326 | # define OPT_INC_X 0
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327 | #endif
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328 |
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329 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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330 | static xlist_t *process0_stdin(xlist_t * list_arg, const char *eof_str ATTRIBUTE_UNUSED,
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331 | size_t mc, char *buf)
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332 | {
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333 | int c; /* current char */
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334 | char *s = NULL; /* start word */
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335 | char *p = NULL; /* pointer to end word */
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336 | size_t line_l = 0; /* size loaded args line */
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337 | xlist_t *cur;
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338 | xlist_t *prev;
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339 |
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340 | for (prev = cur = list_arg; cur; cur = cur->link) {
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341 | line_l += cur->lenght; /* previous allocated */
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342 | if (prev != cur)
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343 | prev = prev->link;
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344 | }
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345 |
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346 | while (!eof_stdin_detected) {
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347 | c = getchar();
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348 | if (c == EOF) {
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349 | eof_stdin_detected++;
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350 | if (s == NULL)
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351 | break;
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352 | c = 0;
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353 | }
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354 | if (s == NULL)
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355 | s = p = buf;
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356 | if ((size_t)(p - buf) >= mc)
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357 | bb_error_msg_and_die("argument line too long");
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358 | *p++ = c;
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359 | if (c == 0) { /* word's delimiter or EOF detected */
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360 | /* word loaded */
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361 | size_t lenght = (p - buf);
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362 |
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363 | cur = xmalloc(sizeof(xlist_t) + lenght);
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364 | cur->data = memcpy(cur + 1, s, lenght);
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365 | cur->lenght = lenght;
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366 | cur->link = NULL;
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367 | if (prev == NULL) {
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368 | list_arg = cur;
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369 | } else {
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370 | prev->link = cur;
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371 | }
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372 | prev = cur;
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373 | line_l += lenght;
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374 | if (line_l > mc) {
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375 | /* stop memory usage :-) */
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376 | break;
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377 | }
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378 | s = NULL;
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379 | }
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380 | }
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381 | return list_arg;
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382 | }
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383 |
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384 | # define READ_ARGS(l, e, nmc, mc) (*read_args)(l, e, nmc, mc)
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385 | # define OPT_INC_0 1 /* future use */
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386 | #else
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387 | # define OPT_INC_0 0 /* future use */
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388 | # define READ_ARGS(l, e, nmc, mc) process_stdin(l, e, nmc, mc)
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389 | #endif /* CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM */
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390 |
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391 |
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392 | #define OPT_VERBOSE (1<<0)
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393 | #define OPT_NO_EMPTY (1<<1)
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394 | #define OPT_UPTO_NUMBER (1<<2)
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395 | #define OPT_UPTO_SIZE (1<<3)
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396 | #define OPT_EOF_STRING (1<<4)
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397 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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398 | #define OPT_INTERACTIVE (1<<5)
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399 | #else
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400 | #define OPT_INTERACTIVE (0) /* require for algorithm &| */
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401 | #endif
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402 | #define OPT_TERMINATE (1<<(5+OPT_INC_P))
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403 | #define OPT_ZEROTERM (1<<(5+OPT_INC_P+OPT_INC_X))
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404 | /* next future
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405 | #define OPT_NEXT_OTHER (1<<(5+OPT_INC_P+OPT_INC_X+OPT_INC_0))
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406 | */
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407 |
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408 | int xargs_main(int argc, char **argv)
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409 | {
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410 | char **args;
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411 | int i, a, n;
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412 | xlist_t *list = NULL;
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413 | xlist_t *cur;
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414 | int child_error = 0;
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415 | char *max_args, *max_chars;
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416 | int n_max_arg;
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417 | size_t n_chars = 0;
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418 | long orig_arg_max;
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419 | const char *eof_str = "_";
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420 | unsigned long opt;
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421 | size_t n_max_chars;
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422 |
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423 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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424 | xlist_t *(*read_args) (xlist_t *, const char *, size_t, char *) = process_stdin;
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425 | #endif
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426 |
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427 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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428 | bb_opt_complementally = "pt";
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429 | #endif
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430 |
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431 | opt = bb_getopt_ulflags(argc, argv, "+trn:s:e::"
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432 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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433 | "p"
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434 | #endif
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435 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
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436 | "x"
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437 | #endif
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438 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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439 | "0"
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440 | #endif
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441 | ,&max_args, &max_chars, &eof_str);
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442 |
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443 | a = argc - optind;
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444 | argv += optind;
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445 | if (a == 0) {
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446 | /* default behavior is to echo all the filenames */
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447 | *argv = "echo";
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448 | a++;
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449 | }
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450 |
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451 | orig_arg_max = ARG_MAX;
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452 | if (orig_arg_max == -1)
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453 | orig_arg_max = LONG_MAX;
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454 | orig_arg_max -= 2048; /* POSIX.2 requires subtracting 2048. */
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455 | if ((opt & OPT_UPTO_SIZE)) {
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456 | n_max_chars = bb_xgetularg10_bnd(max_chars, 1, orig_arg_max);
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457 | for (i = 0; i < a; i++) {
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458 | n_chars += strlen(*argv) + 1;
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459 | }
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460 | if (n_max_chars < n_chars) {
|
---|
461 | bb_error_msg_and_die("can not fit single argument within argument list size limit");
|
---|
462 | }
|
---|
463 | n_max_chars -= n_chars;
|
---|
464 | } else {
|
---|
465 | /* Sanity check for systems with huge ARG_MAX defines (e.g., Suns which
|
---|
466 | have it at 1 meg). Things will work fine with a large ARG_MAX but it
|
---|
467 | will probably hurt the system more than it needs to; an array of this
|
---|
468 | size is allocated. */
|
---|
469 | if (orig_arg_max > 20 * 1024)
|
---|
470 | orig_arg_max = 20 * 1024;
|
---|
471 | n_max_chars = orig_arg_max;
|
---|
472 | }
|
---|
473 | max_chars = xmalloc(n_max_chars);
|
---|
474 |
|
---|
475 | if ((opt & OPT_UPTO_NUMBER)) {
|
---|
476 | n_max_arg = bb_xgetularg10_bnd(max_args, 1, INT_MAX);
|
---|
477 | } else {
|
---|
478 | n_max_arg = n_max_chars;
|
---|
479 | }
|
---|
480 |
|
---|
481 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
|
---|
482 | if (opt & OPT_ZEROTERM)
|
---|
483 | read_args = process0_stdin;
|
---|
484 | #endif
|
---|
485 |
|
---|
486 | while ((list = READ_ARGS(list, eof_str, n_max_chars, max_chars)) != NULL ||
|
---|
487 | (opt & OPT_NO_EMPTY) == 0)
|
---|
488 | {
|
---|
489 | opt |= OPT_NO_EMPTY;
|
---|
490 | n = 0;
|
---|
491 | n_chars = 0;
|
---|
492 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
|
---|
493 | for (cur = list; cur;) {
|
---|
494 | n_chars += cur->lenght;
|
---|
495 | n++;
|
---|
496 | cur = cur->link;
|
---|
497 | if (n_chars > n_max_chars || (n == n_max_arg && cur)) {
|
---|
498 | if (opt & OPT_TERMINATE)
|
---|
499 | bb_error_msg_and_die("argument list too long");
|
---|
500 | break;
|
---|
501 | }
|
---|
502 | }
|
---|
503 | #else
|
---|
504 | for (cur = list; cur; cur = cur->link) {
|
---|
505 | n_chars += cur->lenght;
|
---|
506 | n++;
|
---|
507 | if (n_chars > n_max_chars || n == n_max_arg) {
|
---|
508 | break;
|
---|
509 | }
|
---|
510 | }
|
---|
511 | #endif /* CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT */
|
---|
512 |
|
---|
513 | /* allocating pointers for execvp:
|
---|
514 | a*arg, n*arg from stdin, NULL */
|
---|
515 | args = xcalloc(n + a + 1, sizeof(char *));
|
---|
516 |
|
---|
517 | /* Store the command to be executed
|
---|
518 | (taken from the command line) */
|
---|
519 | for (i = 0; i < a; i++)
|
---|
520 | args[i] = argv[i];
|
---|
521 | /* (taken from stdin) */
|
---|
522 | for (cur = list; n; cur = cur->link) {
|
---|
523 | args[i++] = cur->data;
|
---|
524 | n--;
|
---|
525 | }
|
---|
526 |
|
---|
527 | if ((opt & (OPT_INTERACTIVE | OPT_VERBOSE))) {
|
---|
528 | for (i = 0; args[i]; i++) {
|
---|
529 | if (i)
|
---|
530 | fputc(' ', stderr);
|
---|
531 | fputs(args[i], stderr);
|
---|
532 | }
|
---|
533 | if ((opt & OPT_INTERACTIVE) == 0)
|
---|
534 | fputc('\n', stderr);
|
---|
535 | }
|
---|
536 | if ((opt & OPT_INTERACTIVE) == 0 || xargs_ask_confirmation() != 0) {
|
---|
537 | child_error = xargs_exec(args);
|
---|
538 | }
|
---|
539 |
|
---|
540 | /* clean up */
|
---|
541 | for (i = a; args[i]; i++) {
|
---|
542 | cur = list;
|
---|
543 | list = list->link;
|
---|
544 | free(cur);
|
---|
545 | }
|
---|
546 | free(args);
|
---|
547 | if (child_error > 0 && child_error != 123) {
|
---|
548 | break;
|
---|
549 | }
|
---|
550 | }
|
---|
551 | #ifdef CONFIG_FEATURE_CLEAN_UP
|
---|
552 | free(max_chars);
|
---|
553 | #endif
|
---|
554 | return child_error;
|
---|
555 | }
|
---|
556 |
|
---|
557 |
|
---|
558 | #ifdef TEST
|
---|
559 |
|
---|
560 | const char *bb_applet_name = "debug stuff usage";
|
---|
561 |
|
---|
562 | void bb_show_usage(void)
|
---|
563 | {
|
---|
564 | fprintf(stderr, "Usage: %s [-p] [-r] [-t] -[x] [-n max_arg] [-s max_chars]\n",
|
---|
565 | bb_applet_name);
|
---|
566 | exit(1);
|
---|
567 | }
|
---|
568 |
|
---|
569 | int main(int argc, char **argv)
|
---|
570 | {
|
---|
571 | return xargs_main(argc, argv);
|
---|
572 | }
|
---|
573 | #endif /* TEST */
|
---|