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#define _GNU_SOURCE
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <math.h>
#include "bloom.h"
static const size_t PAM_BLOOM_MAX_ENTRY_LENGTH = 4096;
static uint64_t
count_lines(FILE *fp)
{
char *line = NULL;
size_t cap = 0;
uint64_t count = 0;
while (getline(&line, &cap, fp) != -1) {
count++;
}
free(line);
if (ferror(fp)) {
perror("getline");
exit(EXIT_FAILURE);
}
return count;
}
static size_t
trim_newline(char *line, size_t len)
{
if (len > 0 && line[len - 1] == '\n') {
len--;
if (len > 0 && line[len - 1] == '\r') {
len--;
}
}
return len;
}
static int
validate_entry(const char *line, size_t len, uint64_t line_number)
{
if (len == 0) {
fprintf(stderr, "line %llu: empty entry\n", (unsigned long long)line_number);
return -1;
}
if (len > PAM_BLOOM_MAX_ENTRY_LENGTH) {
fprintf(
stderr,
"line %llu: entry exceeds maximum length of %zu bytes\n",
(unsigned long long)line_number,
PAM_BLOOM_MAX_ENTRY_LENGTH
);
return -1;
}
if (memchr(line, '\0', len) != NULL) {
fprintf(stderr, "line %llu: entry contains NUL byte\n", (unsigned long long)line_number);
return -1;
}
return 0;
}
int
main(int argc, char **argv)
{
double fpr = 0.001;
int opt;
while ((opt = getopt(argc, argv, "p:")) != -1) {
switch (opt) {
case 'p': {
char *end = NULL;
errno = 0;
double value = strtod(optarg, &end);
if (errno != 0 || end == optarg || *end != '\0' ||
!isfinite(value) || value <= 0.0 || value >= 1.0) {
fprintf(stderr, "invalid false-positive rate: %s\n", optarg);
return EXIT_FAILURE;
}
fpr = value;
break;
}
default:
fprintf(stderr, "usage: %s [-p FPR] WORDLIST OUTPUT NAME\n", argv[0]);
return EXIT_FAILURE;
}
}
if (argc - optind != 3) {
fprintf(stderr, "usage: %s [-p FPR] WORDLIST OUTPUT NAME\n", argv[0]);
return EXIT_FAILURE;
}
const char *input = argv[optind];
const char *output = argv[optind + 1];
const char *name = argv[optind + 2];
if (!bloom_valid_filter_name((const uint8_t *)name, strlen(name) + 1)) {
fprintf(stderr, "invalid filter name\n");
return EXIT_FAILURE;
}
FILE *fp = fopen(input, "rb");
if (!fp) {
perror(input);
return EXIT_FAILURE;
}
uint64_t count = count_lines(fp);
if (count == 0) {
fprintf(stderr, "%s: empty wordlist\n", input);
fclose(fp);
return EXIT_FAILURE;
}
printf("entries: %llu\n", (unsigned long long)count);
if (fseeko(fp, 0, SEEK_SET) == -1) {
perror("fseeko");
fclose(fp);
return EXIT_FAILURE;
}
if (count > SIZE_MAX) {
fprintf(stderr, "%s: too many entries for this platform\n", input);
fclose(fp);
return EXIT_FAILURE;
}
bloomfilter bf = {0};
bloom_error_t err = bloom_init(&bf, (size_t)count, fpr);
if (err != BF_SUCCESS) {
fprintf(stderr, "bloom_init: %s\n", bloom_strerror(err));
fclose(fp);
return EXIT_FAILURE;
}
if (!bloom_set_name(&bf, name)) {
fprintf(stderr, "filter name too long\n");
bloom_destroy(&bf);
fclose(fp);
return EXIT_FAILURE;
}
char *line = NULL;
size_t capacity = 0;
ssize_t nread;
uint64_t inserted = 0;
uint64_t line_number = 0;
while ((nread = getline(&line, &capacity, fp)) != -1) {
line_number++;
size_t len = trim_newline(line, (size_t)nread);
if (validate_entry(line, len, line_number) < 0) {
free(line);
bloom_destroy(&bf);
fclose(fp);
return EXIT_FAILURE;
}
bloom_add(&bf, line, len);
inserted++;
}
if (ferror(fp)) {
perror("getline");
free(line);
bloom_destroy(&bf);
fclose(fp);
return EXIT_FAILURE;
}
free(line);
fclose(fp);
if (inserted != count) {
fprintf(stderr,
"input changed while processing (counted %llu, read %llu)\n",
(unsigned long long)count,
(unsigned long long)inserted);
bloom_destroy(&bf);
return EXIT_FAILURE;
}
err = bloom_save(&bf, output);
if (err != BF_SUCCESS) {
fprintf(stderr, "bloom_save: %s\n", bloom_strerror(err));
bloom_destroy(&bf);
return EXIT_FAILURE;
}
printf("filter: %s\n", name);
printf("elements: %llu\n", (unsigned long long)inserted);
printf("bits: %zu\n", bf.size);
printf("bytes: %zu\n", bf.bitmap_size);
printf("hashes: %zu\n", bf.hashcount);
printf("fpr: %.10g\n", fpr);
printf("saturation: %.2f%%\n", bloom_saturation(&bf));
bloom_destroy(&bf);
return EXIT_SUCCESS;
}
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