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#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "config.h"
#include "global.h"
struct config_data {
size_t num_apikeys;
char **apikeys;
struct apikey_perm *apikey_perms;
};
static struct config_data config_data;
static void add_apikey(char *key, struct apikey_perm perm) {
// This is slow, but optimisation is not worth it
config_data.num_apikeys++;
config_data.apikeys = realloc(config_data.apikeys, config_data.num_apikeys, char*);
config_data.apikey_perms =
realloc(config_data.apikey_perms, config_data.num_apikeys, struct apikey_perm);
config_data.apikeys[config_data.num_apikeys - 1] = key;
config_data.apikey_perms[config_data.num_apikeys - 1] = perm;
}
struct slice {
const char *s;
size_t len;
};
static struct slice next_word(struct slice *line) {
size_t cursor = 0;
while (cursor < line->len && isspace(line->s[cursor])) cursor++;
const size_t start = cursor;
while (cursor < line->len && !isspace(line->s[cursor])) cursor++;
const struct slice word = (struct slice){line->s + start, cursor - start};
line->s += cursor;
line->len -= cursor;
return word;
}
static void apply_config_line(const char *linebuf, size_t linelen) {
struct slice line = (struct slice){linebuf, linelen};
struct slice cmd = next_word(&line);
if (cmd.len == 0) return;
if (cmd.len == 6 && memcmp(cmd.s, "apikey", 6) == 0) {
struct slice key = next_word(&line);
struct slice pbits = next_word(&line);
if (line.len > 0) die("Too many fields on 'apikey' line");
for (size_t i = 0; i < pbits.len; i++) {
if (pbits.s[i] != '0' && pbits.s[i] != '1') {
die("Invalid permission bit '%c' on 'apikey' line", pbits.s[i]);
}
}
if (pbits.len != 1) die("Incorrect permission bit vector length on 'apikey' line");
struct apikey_perm perm;
perm.sendat = pbits.s[0] == '1';
for (size_t i = 0; i < key.len; i++) {
if (key.s[i] == '\0') die("Invalid null byte in key on 'apikey' line");
}
char *keystr = malloc(key.len + 1, char);
memcpy(keystr, key.s, key.len);
keystr[key.len] = '\0';
add_apikey(keystr, perm);
} else {
char *cmdstr = malloc(cmd.len + 1, char);
memcpy(cmdstr, cmd.s, cmd.len);
cmdstr[cmd.len] = '\0';
die("Unknown command '%s' in config file", cmdstr);
}
}
void config_init(const char *filename) {
FILE *f = fopen(filename, "r");
if (!f) die("Cannot open config file '%s'", filename);
char *line = NULL;
size_t linecap = 0;
ssize_t nr;
while ((nr = getline(&line, &linecap, f)) >= 0) {
if (line[0] == '#') continue;
if (nr > 0 && line[nr - 1] == '\n') nr--;
if (nr > 0 && line[nr - 1] == '\r') nr--;
apply_config_line(line, nr);
}
free(line);
if (!feof(f) && ferror(f)) {
die("Error reading config file '%s': %s", filename, strerror(errno));
}
fprintf(stderr, "config: Registered %zu API key%s\n",
config_data.num_apikeys, config_data.num_apikeys == 1 ? "" : "s");
}
struct apikey_perm config_check_apikey(const char *apikey) {
for (size_t i = 0; i < config_data.num_apikeys; i++) {
if (strcmp(config_data.apikeys[i], apikey) == 0) {
return config_data.apikey_perms[i];
}
}
// Unknown key means no permissions
struct apikey_perm perm;
memset(&perm, 0, sizeof perm);
return perm;
}
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