439 lines
12 KiB
C
439 lines
12 KiB
C
#include <stddef.h>
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#include <stdbool.h>
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#include <lib/config.h>
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#include <lib/libc.h>
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#include <lib/misc.h>
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#include <lib/readline.h>
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#include <mm/pmm.h>
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#include <fs/file.h>
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#include <lib/print.h>
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#include <pxe/tftp.h>
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#include <crypt/blake2b.h>
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#define CONFIG_B2SUM_SIGNATURE "++CONFIG_B2SUM_SIGNATURE++"
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#define CONFIG_B2SUM_EMPTY "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
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const char *config_b2sum = CONFIG_B2SUM_SIGNATURE CONFIG_B2SUM_EMPTY;
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static bool config_get_entry_name(char *ret, size_t index, size_t limit);
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static char *config_get_entry(size_t *size, size_t index);
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#define SEPARATOR '\n'
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bool config_ready = false;
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no_unwind bool bad_config = false;
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static char *config_addr;
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int init_config_disk(struct volume *part) {
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struct file_handle *f;
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bool old_cif = case_insensitive_fopen;
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case_insensitive_fopen = true;
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if ((f = fopen(part, "/limine.cfg")) == NULL
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&& (f = fopen(part, "/limine/limine.cfg")) == NULL
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&& (f = fopen(part, "/boot/limine.cfg")) == NULL
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&& (f = fopen(part, "/boot/limine/limine.cfg")) == NULL
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&& (f = fopen(part, "/EFI/BOOT/limine.cfg")) == NULL) {
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case_insensitive_fopen = old_cif;
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return -1;
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}
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case_insensitive_fopen = old_cif;
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size_t config_size = f->size + 2;
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config_addr = ext_mem_alloc(config_size);
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fread(f, config_addr, 0, f->size);
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fclose(f);
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return init_config(config_size);
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}
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#define NOT_CHILD (-1)
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#define DIRECT_CHILD 0
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#define INDIRECT_CHILD 1
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static int is_child(char *buf, size_t limit,
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size_t current_depth, size_t index) {
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if (!config_get_entry_name(buf, index, limit))
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return NOT_CHILD;
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if (strlen(buf) < current_depth + 1)
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return NOT_CHILD;
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for (size_t j = 0; j < current_depth; j++)
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if (buf[j] != ':')
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return NOT_CHILD;
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if (buf[current_depth] == ':')
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return INDIRECT_CHILD;
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return DIRECT_CHILD;
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}
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static bool is_directory(char *buf, size_t limit,
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size_t current_depth, size_t index) {
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switch (is_child(buf, limit, current_depth + 1, index + 1)) {
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default:
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case NOT_CHILD:
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return false;
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case INDIRECT_CHILD:
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bad_config = true;
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panic(true, "config: Malformed config file. Parentless child.");
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case DIRECT_CHILD:
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return true;
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}
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}
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static struct menu_entry *create_menu_tree(struct menu_entry *parent,
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size_t current_depth, size_t index) {
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struct menu_entry *root = NULL, *prev = NULL;
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for (size_t i = index; ; i++) {
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static char name[64];
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switch (is_child(name, 64, current_depth, i)) {
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case NOT_CHILD:
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return root;
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case INDIRECT_CHILD:
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continue;
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case DIRECT_CHILD:
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break;
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}
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struct menu_entry *entry = ext_mem_alloc(sizeof(struct menu_entry));
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if (root == NULL)
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root = entry;
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config_get_entry_name(name, i, 64);
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bool default_expanded = name[current_depth] == '+';
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strcpy(entry->name, name + current_depth + default_expanded);
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entry->parent = parent;
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size_t entry_size;
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char *config_entry = config_get_entry(&entry_size, i);
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entry->body = ext_mem_alloc(entry_size + 1);
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memcpy(entry->body, config_entry, entry_size);
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entry->body[entry_size] = 0;
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if (is_directory(name, 64, current_depth, i)) {
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entry->sub = create_menu_tree(entry, current_depth + 1, i + 1);
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entry->expanded = default_expanded;
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}
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char *comment = config_get_value(entry->body, 0, "COMMENT");
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if (comment != NULL) {
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entry->comment = comment;
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}
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if (prev != NULL)
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prev->next = entry;
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prev = entry;
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}
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}
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struct menu_entry *menu_tree = NULL;
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struct macro {
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char name[1024];
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char value[2048];
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struct macro *next;
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};
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static struct macro *macros = NULL;
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int init_config(size_t config_size) {
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config_b2sum += sizeof(CONFIG_B2SUM_SIGNATURE) - 1;
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if (memcmp((void *)config_b2sum, CONFIG_B2SUM_EMPTY, 128) != 0) {
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uint8_t out_buf[BLAKE2B_OUT_BYTES];
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blake2b(out_buf, config_addr, config_size - 2);
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uint8_t hash_buf[BLAKE2B_OUT_BYTES];
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for (size_t i = 0; i < BLAKE2B_OUT_BYTES; i++) {
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hash_buf[i] = digit_to_int(config_b2sum[i * 2]) << 4 | digit_to_int(config_b2sum[i * 2 + 1]);
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}
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if (memcmp(hash_buf, out_buf, BLAKE2B_OUT_BYTES) != 0) {
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panic(false, "!!! CHECKSUM MISMATCH FOR CONFIG FILE !!!");
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}
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}
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// add trailing newline if not present
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config_addr[config_size - 2] = '\n';
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// remove windows carriage returns and spaces at the start of lines, if any
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for (size_t i = 0; i < config_size; i++) {
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size_t skip = 0;
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while ((config_addr[i + skip] == '\r')
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|| ((!i || config_addr[i - 1] == '\n')
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&& (config_addr[i + skip] == ' ' || config_addr[i + skip] == '\t'))) {
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skip++;
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}
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if (skip) {
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for (size_t j = i; j < config_size - skip; j++)
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config_addr[j] = config_addr[j + skip];
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config_size -= skip;
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}
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}
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// Load macros
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for (size_t i = 0; i < config_size;) {
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if ((config_size - i >= 3 && memcmp(config_addr + i, "\n${", 3) == 0)
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|| (config_size - i >= 2 && i == 0 && memcmp(config_addr, "${", 2) == 0)) {
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struct macro *macro = ext_mem_alloc(sizeof(struct macro));
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i += i ? 3 : 2;
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size_t j;
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for (j = 0; config_addr[i] != '}' && config_addr[i] != '\n' && config_addr[i] != 0; j++, i++) {
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macro->name[j] = config_addr[i];
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}
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if (config_addr[i] == '\n' || config_addr[i] == 0 || config_addr[i+1] != '=') {
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continue;
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}
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i += 2;
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macro->name[j] = 0;
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for (j = 0; config_addr[i] != '\n' && config_addr[i] != 0; j++, i++) {
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macro->value[j] = config_addr[i];
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}
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macro->value[j] = 0;
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macro->next = macros;
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macros = macro;
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continue;
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}
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i++;
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}
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// Expand macros
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if (macros != NULL) {
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size_t new_config_size = config_size * 4;
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char *new_config = ext_mem_alloc(new_config_size);
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size_t i, in;
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for (i = 0, in = 0; i < config_size;) {
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if ((config_size - i >= 3 && memcmp(config_addr + i, "\n${", 3) == 0)
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|| (config_size - i >= 2 && i == 0 && memcmp(config_addr, "${", 2) == 0)) {
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size_t orig_i = i;
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i += i ? 3 : 2;
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while (config_addr[i++] != '}') {
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if (i >= config_size) {
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bad_config = true;
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panic(true, "config: Malformed macro usage");
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}
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}
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if (config_addr[i] != '=') {
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i = orig_i;
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goto next;
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}
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continue;
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}
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next:
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if (config_size - i >= 2 && memcmp(config_addr + i, "${", 2) == 0) {
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char *macro_name = ext_mem_alloc(1024);
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i += 2;
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size_t j;
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for (j = 0; config_addr[i] != '}' && config_addr[i] != '\n' && config_addr[i] != 0; j++, i++) {
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macro_name[j] = config_addr[i];
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}
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if (config_addr[i] != '}') {
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bad_config = true;
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panic(true, "config: Malformed macro usage");
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}
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i++;
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macro_name[j] = 0;
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char *macro_value = "";
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struct macro *macro = macros;
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for (;;) {
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if (macro == NULL) {
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break;
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}
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if (strcmp(macro->name, macro_name) == 0) {
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macro_value = macro->value;
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break;
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}
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macro = macro->next;
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}
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pmm_free(macro_name, 1024);
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for (j = 0; macro_value[j] != 0; j++, in++) {
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if (in >= new_config_size) {
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goto overflow;
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}
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new_config[in] = macro_value[j];
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}
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continue;
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}
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if (in >= new_config_size) {
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overflow:
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bad_config = true;
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panic(true, "config: Macro-induced buffer overflow");
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}
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new_config[in++] = config_addr[i++];
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}
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pmm_free(config_addr, config_size);
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config_addr = new_config;
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config_size = in;
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// Free macros
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struct macro *macro = macros;
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for (;;) {
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if (macro == NULL) {
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break;
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}
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struct macro *next = macro->next;
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pmm_free(macro, sizeof(struct macro));
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macro = next;
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}
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}
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config_ready = true;
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menu_tree = create_menu_tree(NULL, 1, 0);
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size_t s;
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char *c = config_get_entry(&s, 0);
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while (*c != ':') {
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c--;
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}
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if (c > config_addr) {
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c[-1] = 0;
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}
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return 0;
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}
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static bool config_get_entry_name(char *ret, size_t index, size_t limit) {
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if (!config_ready)
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return false;
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char *p = config_addr;
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for (size_t i = 0; i <= index; i++) {
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while (*p != ':') {
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if (!*p)
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return false;
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p++;
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}
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p++;
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if ((p - 1) != config_addr && *(p - 2) != '\n')
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i--;
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}
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p--;
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size_t i;
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for (i = 0; i < (limit - 1); i++) {
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if (p[i] == SEPARATOR)
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break;
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ret[i] = p[i];
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}
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ret[i] = 0;
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return true;
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}
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static char *config_get_entry(size_t *size, size_t index) {
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if (!config_ready)
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return NULL;
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char *ret;
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char *p = config_addr;
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for (size_t i = 0; i <= index; i++) {
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while (*p != ':') {
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if (!*p)
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return NULL;
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p++;
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}
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p++;
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if ((p - 1) != config_addr && *(p - 2) != '\n')
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i--;
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}
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do {
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p++;
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} while (*p != '\n');
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ret = p;
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cont:
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while (*p != ':' && *p)
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p++;
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if (*p && *(p - 1) != '\n') {
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p++;
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goto cont;
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}
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*size = p - ret;
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return ret;
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}
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static const char *lastkey;
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struct conf_tuple config_get_tuple(const char *config, size_t index,
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const char *key1, const char *key2) {
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struct conf_tuple conf_tuple;
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conf_tuple.value1 = config_get_value(config, index, key1);
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if (conf_tuple.value1 == NULL) {
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return (struct conf_tuple){0};
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}
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conf_tuple.value2 = config_get_value(lastkey, 0, key2);
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const char *lk1 = lastkey;
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const char *next_value1 = config_get_value(config, index + 1, key1);
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const char *lk2 = lastkey;
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if (conf_tuple.value2 != NULL && next_value1 != NULL) {
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if ((uintptr_t)lk1 > (uintptr_t)lk2) {
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conf_tuple.value2 = NULL;
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}
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}
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return conf_tuple;
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}
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char *config_get_value(const char *config, size_t index, const char *key) {
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if (!key || !config_ready)
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return NULL;
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if (config == NULL)
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config = config_addr;
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size_t key_len = strlen(key);
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for (size_t i = 0; config[i]; i++) {
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if (!strncmp(&config[i], key, key_len) && config[i + key_len] == '=') {
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if (i && config[i - 1] != SEPARATOR)
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continue;
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if (index--)
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continue;
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i += key_len + 1;
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size_t value_len;
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for (value_len = 0;
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config[i + value_len] != SEPARATOR && config[i + value_len];
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value_len++);
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char *buf = ext_mem_alloc(value_len + 1);
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memcpy(buf, config + i, value_len);
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lastkey = config + i;
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return buf;
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}
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}
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return NULL;
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}
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