ref: master
./meowsum.c
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#define _POSIX_C_SOURCE 200809L #include "meow_hash_x64_aesni.h" #define BUFFER_SIZE 8192 #define HASH_SIZE 128 #define MODE_SUM 0 #define MODE_CHECK 1 #include <assert.h> #include <errno.h> #include <fcntl.h> #include <stdbool.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include <unistd.h> void print_usage() { printf("usage: meowsum [OPTION]... FILE...\n"); printf("Print or check Meow hash checksums.\n"); printf("\n"); printf("When FILE is -, read standard input.\n"); printf("\n"); printf(" -h show this help and exit\n"); printf(" -c read sums from the FILEs and check them\n"); printf(" -s size set hash size; size can be 32, 64, 128 bits;\n"); printf(" the default is 128\n"); printf("\n"); printf("The following options are useful only when verifying checksums:\n"); printf(" -q only return status; do not print OK, ERH, ERS, ERM\n"); printf(" -e fail for missing files\n"); } void parse_args(int argc, char *argv[], bool *quiet, bool *strict_error, int *hash_size, int *first_file_index, int *mode, bool *help) { bool expecting_num = false; for (int i = 1; i < argc; ++i) { if (expecting_num) { *hash_size = atoi(argv[i]); expecting_num = false; continue; } if (argv[i][0] != '-' || strcmp("-", argv[i]) == 0) { *first_file_index = i; break; } if (strcmp(argv[i], "--") == 0) { *first_file_index = i + 1; break; } if (argv[i][0] == '-') { ssize_t length = strlen(argv[i]); for (int j = 1; j < length; ++j) { if (expecting_num) { *hash_size = atoi(argv[i] + j); expecting_num = false; break; } switch (argv[i][j]) { case 'c': *mode = MODE_CHECK; break; case 'q': *quiet = true; break; case 'e': *strict_error = true; break; case 's': expecting_num = true; break; case 'h': *help = true; break; } } } } } meow_u128 *calculate_checksum(char *path, unsigned long *size) { assert(size != NULL); assert(path != NULL); int fd; meow_state state; ssize_t read_bytes = 0; char buffer[BUFFER_SIZE]; meow_u128 *hash = NULL; if (strcmp(path, "-") == 0) { fd = 0; } else { fd = open(path, 0); } if (fd == -1) { perror("error"); fprintf(stderr, "error opening file %s\n", path); return NULL; } *size = 0; hash = malloc(sizeof(meow_u128)); if (hash == NULL) { perror("error"); fprintf(stderr, "error mallocing hash for %s\n", path); return NULL; } MeowBegin(&state, MeowDefaultSeed); while (true) { read_bytes = read(fd, buffer, 8192); if (read_bytes == -1) { perror("error"); fprintf(stderr, "error reading file %s\n", path); close(fd); free(hash); return NULL; } *size += read_bytes; if (read_bytes == 0) { break; } MeowAbsorb(&state, read_bytes, buffer); } *hash = MeowEnd(&state, NULL); if (fd != 0) { close(fd); } return hash; } char *format_sum(meow_u128 hash, int size) { char *result; result = malloc((size * 2 / 8 * sizeof(char)) + 1); if (size == 32) { // NOLINTNEXTLINE sprintf(result, "%08x", MeowU32From(hash, 0)); } if (size == 64) { // NOLINTNEXTLINE sprintf(result, "%016llx", MeowU64From(hash, 0)); } if (size == 128) { int64_t v64val[2]; // NOLINTNEXTLINE memcpy(v64val, &hash, sizeof(v64val)); // NOLINTNEXTLINE sprintf(result, "%016lx%016lx", v64val[1], v64val[0]); } return result; } bool sum_files(char *argv[], int start, int argc, int hash_size) { meow_u128 *hash; char *hex_hash; unsigned long size; for (int i = start; i < argc; ++i) { hash = calculate_checksum(argv[i], &size); if (hash == NULL) { fprintf(stderr, "error while calculating %s\n", argv[i]); return false; } hex_hash = format_sum(*hash, hash_size); if (hex_hash == NULL) { fprintf(stderr, "error while formating hex hash for %s\n", argv[i]); free(hash); return false; } printf("%s %ld %s\n", hex_hash, size, argv[i]); free(hex_hash); free(hash); } return true; } bool read_sum_line(char **line, size_t *line_size, FILE *file, char *filename) { ssize_t read_bytes; read_bytes = getline(line, line_size, file); if (read_bytes == -1) { if (feof(file)) { *line = NULL; return true; } else { perror("error"); fprintf(stderr, "while reading line in %s\n", filename); *line = NULL; return false; } } if (*line[read_bytes - 1] == '\n') { *line[read_bytes - 1] = 0; } return true; } bool parse_sum_line(char *line, unsigned int line_size, char **expected_hex_hash, unsigned long *expected_size, char **path, char *filename, unsigned int *hash_size) { char *expected_size_string; char *next; *expected_hex_hash = malloc(line_size * sizeof(char)); if (expected_hex_hash == NULL) { perror("error"); fprintf(stderr, "error mallocing expected_hex_hash for %s\n", filename); return false; } expected_size_string = malloc(line_size * sizeof(char)); if (expected_size_string == NULL) { perror("error"); fprintf(stderr, "error mallocing expected_size_string for %s\n", filename); free(*expected_hex_hash); return false; } *path = malloc(line_size * sizeof(char)); if (path == NULL) { perror("error"); fprintf(stderr, "error mallocing path for %s\n", filename); free(*expected_hex_hash); free(expected_size_string); return false; } int n = // NOLINTNEXTLINE sscanf(line, "%s %s %s", *expected_hex_hash, expected_size_string, *path); if (n != 3) { fprintf(stderr, "ERR line malformed\n"); free(*expected_hex_hash); free(expected_size_string); free(*path); return false; } *hash_size = strlen(*expected_hex_hash) * 8 / 2; if (!(*hash_size == 32 || *hash_size == 64 || *hash_size == 128)) { fprintf(stderr, "ERR hash size is wrong\n"); free(*expected_hex_hash); free(expected_size_string); free(*path); return false; } *expected_size = strtoul(expected_size_string, &next, 10); if (errno == ERANGE) { fprintf(stderr, "ERR expected size out of range\n"); free(*expected_hex_hash); free(expected_size_string); free(*path); return false; } else if (next == expected_size_string) { fprintf(stderr, "ERR expected size is an invalid number\n"); free(*expected_hex_hash); free(expected_size_string); free(*path); return false; } else if (*next != '\n' && *next != '\0') { fprintf(stderr, "ERR rubbish in expected size\n"); free(*expected_hex_hash); free(expected_size_string); free(*path); return false; } free(expected_size_string); return true; } bool check_files(char *argv[], int start, int argc, bool quiet, bool strict_errors) { char *line = NULL; size_t line_size = 0; FILE *file = NULL; char *expected_hex_hash = NULL, *path = NULL; unsigned long expected_size = 0, size = 0; unsigned int hash_size = 0; meow_u128 *hash = NULL; char *hex_hash = NULL; bool result = true; bool r; for (int i = start; i < argc; ++i) { file = fopen(argv[i], "r"); while (true) { path = NULL; line = NULL; r = read_sum_line(&line, &line_size, file, argv[i]); if (line == NULL) { if (r) { break; } else { continue; } } r = parse_sum_line(line, line_size, &expected_hex_hash, &expected_size, &path, argv[i], &hash_size); if (r == false) { continue; } if (strcmp("-", path) == 0) { if (!quiet) { printf("WARN stdin; skipping\n"); } } else { if (access(path, F_OK) == -1) { if (!quiet) { printf("ERM %s\n", path); } if (strict_errors) { result &= false; } free(expected_hex_hash); free(path); free(line); continue; } hash = calculate_checksum(path, &size); if (hash == NULL) { fprintf(stderr, "ERR calculating %s\n", path); free(expected_hex_hash); free(path); free(line); continue; } hex_hash = format_sum(*hash, hash_size); if (hex_hash == NULL) { fprintf(stderr, "ERR formating hex hash %s\n", path); free(expected_hex_hash); free(hash); free(path); free(line); continue; } if (strcmp(expected_hex_hash, hex_hash) != 0) { if (!quiet) { printf("ERH %s\n", path); } result &= false; } else if (expected_size != size) { if (!quiet) { printf("ERS %s\n", path); } result &= false; } else { if (!quiet) { printf("OK %s\n", path); } } free(hex_hash); free(hash); } free(expected_hex_hash); free(path); free(line); } fclose(file); } return result; } int main(int argc, char *argv[]) { int hash_size = HASH_SIZE, mode = MODE_SUM, first_file_index = -1; bool quiet = false, strict_error = false, help = false; bool result; if (argc == 1) { print_usage(); return 1; } parse_args(argc, argv, &quiet, &strict_error, &hash_size, &first_file_index, &mode, &help); if (first_file_index == -1 || help) { print_usage(); return 1; } if (hash_size != 32 && hash_size != 64 && hash_size != 128) { fprintf(stderr, "unknown hash size %d\n", hash_size); return 1; } switch (mode) { case MODE_SUM: result = sum_files(argv, first_file_index, argc, hash_size); return result ? 0 : 1; case MODE_CHECK: result = check_files(argv, first_file_index, argc, quiet, strict_error); return result ? 0 : 1; default: print_usage(); return 1; } return 0; } |