[2725] | 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 |
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| 11 | #include <stdlib.h>
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| 12 | #include <string.h>
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| 13 | #include <stdio.h>
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| 14 |
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| 15 | #include "../include/autoconf.h"
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| 16 | #include "../include/busybox.h"
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| 17 |
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| 18 | struct bb_applet {
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| 19 | const char *name;
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| 20 | const char *main;
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| 21 | enum bb_install_loc_t install_loc;
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| 22 | enum bb_suid_t need_suid;
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| 23 | /* true if instead of fork(); exec("applet"); waitpid();
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| 24 | * one can do fork(); exit(applet_main(argc,argv)); waitpid(); */
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| 25 | unsigned char noexec;
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| 26 | /* Even nicer */
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| 27 | /* true if instead of fork(); exec("applet"); waitpid();
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| 28 | * one can simply call applet_main(argc,argv); */
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| 29 | unsigned char nofork;
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| 30 | };
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| 31 |
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| 32 | /* Define struct bb_applet applets[] */
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| 33 | #include "../include/applets.h"
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| 34 |
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| 35 | enum { NUM_APPLETS = ARRAY_SIZE(applets) };
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| 36 |
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| 37 | static int offset[NUM_APPLETS];
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| 38 |
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| 39 | static int cmp_name(const void *a, const void *b)
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| 40 | {
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| 41 | const struct bb_applet *aa = a;
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| 42 | const struct bb_applet *bb = b;
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| 43 | return strcmp(aa->name, bb->name);
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| 44 | }
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| 45 |
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| 46 | int main(int argc, char **argv)
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| 47 | {
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| 48 | int i;
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| 49 | int ofs;
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| 50 | unsigned MAX_APPLET_NAME_LEN = 1;
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| 51 |
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| 52 | qsort(applets, NUM_APPLETS, sizeof(applets[0]), cmp_name);
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| 53 |
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| 54 | ofs = 0;
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| 55 | for (i = 0; i < NUM_APPLETS; i++) {
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| 56 | offset[i] = ofs;
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| 57 | ofs += strlen(applets[i].name) + 1;
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| 58 | }
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| 59 | /* We reuse 4 high-order bits of offset array for other purposes,
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| 60 | * so if they are indeed needed, refuse to proceed */
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| 61 | if (ofs > 0xfff)
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| 62 | return 1;
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| 63 | if (!argv[1])
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| 64 | return 1;
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| 65 |
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| 66 | i = open(argv[1], O_WRONLY | O_TRUNC | O_CREAT, 0666);
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| 67 | if (i < 0)
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| 68 | return 1;
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| 69 | dup2(i, 1);
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| 70 |
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| 71 | /* Keep in sync with include/busybox.h! */
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| 72 |
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| 73 | printf("/* This is a generated file, don't edit */\n\n");
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| 74 |
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| 75 | printf("#define NUM_APPLETS %u\n", NUM_APPLETS);
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| 76 | if (NUM_APPLETS == 1) {
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| 77 | printf("#define SINGLE_APPLET_STR \"%s\"\n", applets[0].name);
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| 78 | printf("#define SINGLE_APPLET_MAIN %s_main\n", applets[0].name);
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| 79 | }
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| 80 | printf("\n");
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| 81 |
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| 82 | //printf("#ifndef SKIP_definitions\n");
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| 83 | printf("const char applet_names[] ALIGN1 = \"\"\n");
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| 84 | for (i = 0; i < NUM_APPLETS; i++) {
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| 85 | printf("\"%s\" \"\\0\"\n", applets[i].name);
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| 86 | if (MAX_APPLET_NAME_LEN < strlen(applets[i].name))
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| 87 | MAX_APPLET_NAME_LEN = strlen(applets[i].name);
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| 88 | }
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| 89 | printf(";\n\n");
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| 90 |
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| 91 | printf("#ifndef SKIP_applet_main\n");
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| 92 | printf("int (*const applet_main[])(int argc, char **argv) = {\n");
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| 93 | for (i = 0; i < NUM_APPLETS; i++) {
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| 94 | printf("%s_main,\n", applets[i].main);
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| 95 | }
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| 96 | printf("};\n");
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| 97 | printf("#endif\n\n");
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| 98 |
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| 99 | printf("const uint16_t applet_nameofs[] ALIGN2 = {\n");
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| 100 | for (i = 0; i < NUM_APPLETS; i++) {
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| 101 | printf("0x%04x,\n",
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| 102 | offset[i]
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| 103 | #if ENABLE_FEATURE_PREFER_APPLETS
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| 104 | + (applets[i].nofork << 12)
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| 105 | + (applets[i].noexec << 13)
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| 106 | #endif
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| 107 | #if ENABLE_FEATURE_SUID
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| 108 | + (applets[i].need_suid << 14) /* 2 bits */
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| 109 | #endif
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| 110 | );
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| 111 | }
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| 112 | printf("};\n\n");
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| 113 |
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| 114 | #if ENABLE_FEATURE_INSTALLER
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| 115 | printf("const uint8_t applet_install_loc[] ALIGN1 = {\n");
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| 116 | i = 0;
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| 117 | while (i < NUM_APPLETS) {
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| 118 | int v = applets[i].install_loc; /* 3 bits */
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| 119 | if (++i < NUM_APPLETS)
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| 120 | v |= applets[i].install_loc << 4; /* 3 bits */
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| 121 | printf("0x%02x,\n", v);
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| 122 | i++;
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| 123 | }
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| 124 | printf("};\n");
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| 125 | #endif
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| 126 | //printf("#endif /* SKIP_definitions */\n");
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| 127 | printf("\n");
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| 128 | printf("#define MAX_APPLET_NAME_LEN %u\n", MAX_APPLET_NAME_LEN);
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| 129 |
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| 130 | if (argv[2]) {
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| 131 | char line_old[80];
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| 132 | char line_new[80];
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| 133 | FILE *fp;
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| 134 |
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| 135 | line_old[0] = 0;
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| 136 | fp = fopen(argv[2], "r");
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| 137 | if (fp) {
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| 138 | fgets(line_old, sizeof(line_old), fp);
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| 139 | fclose(fp);
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| 140 | }
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| 141 | sprintf(line_new, "#define NUM_APPLETS %u\n", NUM_APPLETS);
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| 142 | if (strcmp(line_old, line_new) != 0) {
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| 143 | fp = fopen(argv[2], "w");
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| 144 | if (!fp)
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| 145 | return 1;
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| 146 | fputs(line_new, fp);
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| 147 | }
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| 148 | }
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| 149 |
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| 150 | return 0;
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| 151 | }
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