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https://github.com/sheumann/hush.git
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116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Applet table generator.
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* Runs on host and produces include/applet_tables.h
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*
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* Copyright (C) 2007 Denys Vlasenko <vda.linux@googlemail.com>
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*
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* Licensed under GPLv2, see file License in this tarball for details.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "../include/autoconf.h"
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#include "../include/busybox.h"
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struct bb_applet {
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const char *name;
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const char *main;
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enum bb_install_loc_t install_loc;
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enum bb_suid_t need_suid;
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/* true if instead of fork(); exec("applet"); waitpid();
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* one can do fork(); exit(applet_main(argc,argv)); waitpid(); */
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unsigned char noexec;
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/* Even nicer */
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/* true if instead of fork(); exec("applet"); waitpid();
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* one can simply call applet_main(argc,argv); */
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unsigned char nofork;
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};
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/* Define struct bb_applet applets[] */
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#include "../include/applets.h"
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enum { NUM_APPLETS = ARRAY_SIZE(applets) };
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static int offset[NUM_APPLETS];
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static int cmp_name(const void *a, const void *b)
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{
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const struct bb_applet *aa = a;
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const struct bb_applet *bb = b;
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return strcmp(aa->name, bb->name);
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}
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int main(int argc, char **argv)
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{
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int i;
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int ofs;
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qsort(applets, NUM_APPLETS, sizeof(applets[0]), cmp_name);
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ofs = 0;
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for (i = 0; i < NUM_APPLETS; i++) {
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offset[i] = ofs;
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ofs += strlen(applets[i].name) + 1;
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}
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/* We reuse 4 high-order bits of offset array for other purposes,
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* so if they are indeed needed, refuse to proceed */
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if (ofs > 0xfff)
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return 1;
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if (!argv[1])
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return 1;
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i = open(argv[1], O_WRONLY | O_TRUNC | O_CREAT, 0666);
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if (i < 0)
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return 1;
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dup2(i, 1);
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/* Keep in sync with include/busybox.h! */
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puts("/* This is a generated file, don't edit */");
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puts("const char applet_names[] ALIGN1 = \"\"\n");
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for (i = 0; i < NUM_APPLETS; i++) {
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printf("\"%s\" \"\\0\"\n", applets[i].name);
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}
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puts(";");
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puts("int (*const applet_main[])(int argc, char **argv) = {");
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for (i = 0; i < NUM_APPLETS; i++) {
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printf("%s_main,\n", applets[i].main);
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}
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puts("};");
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puts("const uint16_t applet_nameofs[] ALIGN2 = {");
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for (i = 0; i < NUM_APPLETS; i++) {
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printf("0x%04x,\n",
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offset[i]
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#if ENABLE_FEATURE_PREFER_APPLETS
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+ (applets[i].nofork << 12)
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+ (applets[i].noexec << 13)
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#endif
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#if ENABLE_FEATURE_SUID
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+ (applets[i].need_suid << 14) /* 2 bits */
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#endif
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);
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}
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puts("};");
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#if ENABLE_FEATURE_INSTALLER
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puts("const uint8_t applet_install_loc[] ALIGN1 = {");
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i = 0;
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while (i < NUM_APPLETS) {
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int v = applets[i].install_loc; /* 3 bits */
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if (++i < NUM_APPLETS)
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v |= applets[i].install_loc << 4; /* 3 bits */
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printf("0x%02x,\n", v);
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i++;
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}
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puts("};");
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#endif
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return 0;
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}
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