1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Applet table generator.
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4 | * Runs on host and produces include/applet_tables.h
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5 | *
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6 | * Copyright (C) 2007 Denys Vlasenko <vda.linux@googlemail.com>
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7 | *
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8 | * Licensed under GPLv2, see file LICENSE in this source tree.
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9 | */
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10 | #include <sys/types.h>
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11 | #include <sys/stat.h>
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12 | #include <fcntl.h>
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13 | #include <stdlib.h>
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14 | #include <string.h>
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15 | #include <stdio.h>
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16 | #include <unistd.h>
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17 |
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18 | #undef ARRAY_SIZE
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19 | #define ARRAY_SIZE(x) ((unsigned)(sizeof(x) / sizeof((x)[0])))
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20 |
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21 | #include "../include/autoconf.h"
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22 | #include "../include/applet_metadata.h"
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23 |
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24 | struct bb_applet {
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25 | const char *name;
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26 | const char *main;
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27 | enum bb_install_loc_t install_loc;
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28 | enum bb_suid_t need_suid;
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29 | /* true if instead of fork(); exec("applet"); waitpid();
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30 | * one can do fork(); exit(applet_main(argc,argv)); waitpid(); */
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31 | unsigned char noexec;
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32 | /* Even nicer */
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33 | /* true if instead of fork(); exec("applet"); waitpid();
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34 | * one can simply call applet_main(argc,argv); */
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35 | unsigned char nofork;
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36 | };
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37 |
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38 | /* Define struct bb_applet applets[] */
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39 | #include "../include/applets.h"
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40 |
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41 | enum { NUM_APPLETS = ARRAY_SIZE(applets) };
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42 |
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43 | static int offset[NUM_APPLETS];
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44 |
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45 | static int cmp_name(const void *a, const void *b)
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46 | {
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47 | const struct bb_applet *aa = a;
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48 | const struct bb_applet *bb = b;
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49 | return strcmp(aa->name, bb->name);
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50 | }
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51 |
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52 | int main(int argc, char **argv)
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53 | {
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54 | int i;
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55 | int ofs;
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56 | unsigned MAX_APPLET_NAME_LEN = 1;
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57 |
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58 | qsort(applets, NUM_APPLETS, sizeof(applets[0]), cmp_name);
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59 |
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60 | ofs = 0;
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61 | for (i = 0; i < NUM_APPLETS; i++) {
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62 | offset[i] = ofs;
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63 | ofs += strlen(applets[i].name) + 1;
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64 | }
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65 | /* We reuse 4 high-order bits of offset array for other purposes,
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66 | * so if they are indeed needed, refuse to proceed */
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67 | if (ofs > 0xfff)
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68 | return 1;
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69 | if (!argv[1])
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70 | return 1;
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71 |
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72 | i = open(argv[1], O_WRONLY | O_TRUNC | O_CREAT, 0666);
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73 | if (i < 0)
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74 | return 1;
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75 | dup2(i, 1);
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76 |
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77 | /* Keep in sync with include/busybox.h! */
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78 |
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79 | printf("/* This is a generated file, don't edit */\n\n");
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80 |
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81 | printf("#define NUM_APPLETS %u\n", NUM_APPLETS);
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82 | if (NUM_APPLETS == 1) {
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83 | printf("#define SINGLE_APPLET_STR \"%s\"\n", applets[0].name);
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84 | printf("#define SINGLE_APPLET_MAIN %s_main\n", applets[0].main);
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85 | }
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86 | printf("\n");
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87 |
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88 | //printf("#ifndef SKIP_definitions\n");
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89 | printf("const char applet_names[] ALIGN1 = \"\"\n");
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90 | for (i = 0; i < NUM_APPLETS; i++) {
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91 | printf("\"%s\" \"\\0\"\n", applets[i].name);
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92 | if (MAX_APPLET_NAME_LEN < strlen(applets[i].name))
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93 | MAX_APPLET_NAME_LEN = strlen(applets[i].name);
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94 | }
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95 | printf(";\n\n");
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96 |
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97 | printf("#ifndef SKIP_applet_main\n");
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98 | printf("int (*const applet_main[])(int argc, char **argv) = {\n");
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99 | for (i = 0; i < NUM_APPLETS; i++) {
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100 | printf("%s_main,\n", applets[i].main);
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101 | }
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102 | printf("};\n");
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103 | printf("#endif\n\n");
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104 |
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105 | printf("const uint16_t applet_nameofs[] ALIGN2 = {\n");
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106 | for (i = 0; i < NUM_APPLETS; i++) {
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107 | printf("0x%04x,\n",
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108 | offset[i]
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109 | #if ENABLE_FEATURE_PREFER_APPLETS
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110 | + (applets[i].nofork << 12)
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111 | + (applets[i].noexec << 13)
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112 | #endif
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113 | #if ENABLE_FEATURE_SUID
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114 | + (applets[i].need_suid << 14) /* 2 bits */
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115 | #endif
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116 | );
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117 | }
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118 | printf("};\n\n");
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119 |
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120 | #if ENABLE_FEATURE_INSTALLER
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121 | printf("const uint8_t applet_install_loc[] ALIGN1 = {\n");
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122 | i = 0;
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123 | while (i < NUM_APPLETS) {
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124 | int v = applets[i].install_loc; /* 3 bits */
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125 | if (++i < NUM_APPLETS)
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126 | v |= applets[i].install_loc << 4; /* 3 bits */
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127 | printf("0x%02x,\n", v);
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128 | i++;
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129 | }
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130 | printf("};\n");
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131 | #endif
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132 | //printf("#endif /* SKIP_definitions */\n");
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133 | printf("\n");
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134 | printf("#define MAX_APPLET_NAME_LEN %u\n", MAX_APPLET_NAME_LEN);
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135 |
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136 | if (argv[2]) {
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137 | char line_old[80];
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138 | char line_new[80];
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139 | FILE *fp;
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140 |
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141 | line_old[0] = 0;
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142 | fp = fopen(argv[2], "r");
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143 | if (fp) {
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144 | fgets(line_old, sizeof(line_old), fp);
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145 | fclose(fp);
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146 | }
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147 | sprintf(line_new, "#define NUM_APPLETS %u\n", NUM_APPLETS);
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148 | if (strcmp(line_old, line_new) != 0) {
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149 | fp = fopen(argv[2], "w");
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150 | if (!fp)
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151 | return 1;
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152 | fputs(line_new, fp);
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153 | }
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154 | }
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155 |
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156 | return 0;
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157 | }
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