parsing args with getopt

This commit is contained in:
zabbius 2024-08-09 15:21:54 +03:00
parent 7d60fd8854
commit 916d575920

View File

@ -26,6 +26,9 @@
#include <pthread.h>
#include <sys/socket.h>
#include <unistd.h>
#include <getopt.h>
#include "config.h"
#include "mangle.h"
@ -59,34 +62,7 @@ struct config_t config = {
.domains_strlen = sizeof(defaul_snistr),
};
const char* get_value(const char *option, const char *prefix)
{
errno = 0;
size_t prefix_len = strlen(prefix);
size_t option_len = strlen(option);
if (option_len <= prefix_len || strncmp(prefix, option, prefix_len)) {
return NULL;
}
return option + prefix_len;
}
int parse_bool_option(const char *value) {
errno = 0;
if (strcmp(value, "1") == 0) {
return 1;
}
else if (strcmp(value, "0") == 0) {
return 0;
}
errno = EINVAL;
return -1;
}
long parse_numeric_option(const char* value) {
static long parse_numeric_option(const char* value) {
errno = 0;
char* end;
@ -99,135 +75,12 @@ long parse_numeric_option(const char* value) {
return result;
}
int parse_option(const char* option) {
const char* value;
int ret;
if (!strcmp(option, "--no-gso")) {
config.use_gso = 0;
goto out;
static void print_version() {
printf("Youtube unblocker v0.0.1\n"); //TODO
}
if (!strcmp(option, "--silent")) {
config.verbose = 0;
goto out;
}
if ((value = get_value(option, "--sni-domains")) != 0) {
if (!value) {
goto err;
}
if (strcmp(value, "all")) {
config.all_domains = 1;
}
config.domains_str = value;
config.domains_strlen = strlen(value);
goto out;
}
if ((value = get_value(option, "--frag=")) != 0) {
if (!value) {
goto err;
}
if (strcmp(value, "tcp") == 0) {
config.fragmentation_strategy = FRAG_STRAT_TCP;
} else if (strcmp(value, "ip") == 0) {
config.fragmentation_strategy = FRAG_STRAT_IP;
} else if (strcmp(value, "none") == 0) {
config.fragmentation_strategy = FRAG_STRAT_NONE;
} else {
goto err;
}
goto out;
}
if ((value = get_value(option, "--fake-sni=")) != 0) {
if (strcmp(value, "ack") == 0) {
config.fake_sni_strategy = FKSN_STRAT_ACK_SEQ;
} else if (strcmp(value, "ttl") == 0) {
config.fake_sni_strategy = FKSN_STRAT_TTL;
}
else if (strcmp(value, "none") == 0) {
config.fake_sni_strategy = FKSN_STRAT_NONE;
} else {
goto err;
}
goto out;
}
if ((value = get_value(option, "--seg2delay=")) != 0) {
long num = parse_numeric_option(value);
if (errno != 0 ||
num < 0)
goto err;
config.seg2_delay = num;
goto out;
}
if ((value = get_value(option, "--threads=")) != 0) {
long num = parse_numeric_option(value);
if (errno != 0 ||
num < 0 ||
num > MAX_THREADS) {
errno = EINVAL;
goto err;
}
config.threads = num;
goto out;
}
if ((value = get_value(option, "--fake-sni-ttl=")) != 0) {
long num = parse_numeric_option(value);
if (errno != 0 ||
num < 0 ||
num > 255) {
goto err;
}
config.fake_sni_ttl = num;
goto out;
}
err:
errno = EINVAL;
return -1;
out:
errno = 0;
return 0;
}
static int parse_args(int argc, const char *argv[]) {
int err;
char *end;
if (argc < 2) {
errno = EINVAL;
goto errormsg_help;
}
config.queue_start_num = parse_numeric_option(argv[1]);
if (errno != 0) goto errormsg_help;
for (int i = 2; i < argc; i++) {
if (parse_option(argv[i])) {
printf("Invalid option %s\n", argv[i]);
goto errormsg_help;
}
}
return 0;
errormsg_help:
err = errno;
printf("Usage: %s <queue_num> [OPTIONS]\n", argv[0]);
static void print_usage(const char *argv0) {
printf("Usage: %s [ OPTIONS ] <queue_num> \n", argv0);
printf("Options:\n");
printf("\t--sni-domains=<comma separated domain list>|all\n");
printf("\t--fake-sni={ack,ttl,none}\n");
@ -237,12 +90,133 @@ errormsg_help:
printf("\t--threads=<threads number>\n");
printf("\t--silent\n");
printf("\t--no-gso\n");
errno = err;
if (errno == 0) errno = EINVAL;
}
#define OPT_SNI_DOMAINS 1
#define OPT_FAKE_SNI 2
#define OPT_FAKE_SNI_TTL 3
#define OPT_FRAG 4
#define OPT_SEG2DELAY 5
#define OPT_THREADS 6
#define OPT_SILENT 7
#define OPT_NO_GSO 8
static struct option long_opt[] = {
{"help", 0, 0, 'h'},
{"version", 0, 0, 'v'},
{"sni-domains", 1, 0, OPT_SNI_DOMAINS},
{"fake-sni", 1, 0, OPT_FAKE_SNI},
{"fake-sni-ttl", 1, 0, OPT_FAKE_SNI_TTL},
{"frag", 1, 0, OPT_FRAG},
{"seg2delay", 1, 0, OPT_SEG2DELAY},
{"threads", 1, 0, OPT_THREADS},
{"silent", 0, 0, OPT_SILENT},
{"no-gso", 0, 0, OPT_NO_GSO},
{0,0,0,0}
};
static int parse_args(int argc, const char *argv[]) {
int opt;
int optIdx;
long num;
if (argc < 2) {
print_usage(argv[0]);
errno = EINVAL;
return -1;
}
while ((opt = getopt_long(argc, argv, "hv", long_opt, &optIdx)) != -1) {
switch (opt) {
case 'h':
print_usage(argv[0]);
errno = 0;
return 1;
case 'v':
print_version();
errno = 0;
return 1;
case OPT_SILENT:
config.verbose = 0;
break;
case OPT_NO_GSO:
config.use_gso = 0;
break;
case OPT_SNI_DOMAINS:
if (strcmp(optarg, "all")) {
config.all_domains = 1;
}
config.domains_str = optarg;
config.domains_strlen = strlen(config.domains_str);
break;
case OPT_FRAG:
if (strcmp(optarg, "tcp") == 0) {
config.fragmentation_strategy = FRAG_STRAT_TCP;
} else if (strcmp(optarg, "ip") == 0) {
config.fragmentation_strategy = FRAG_STRAT_IP;
} else if (strcmp(optarg, "none") == 0) {
config.fragmentation_strategy = FRAG_STRAT_NONE;
} else {
errno = EINVAL;
printf("Invalid option %s\n", long_opt[optIdx].name);
return -1;
}
break;
case OPT_FAKE_SNI:
if (strcmp(optarg, "ack") == 0) {
config.fake_sni_strategy = FKSN_STRAT_ACK_SEQ;
} else if (strcmp(optarg, "ttl") == 0) {
config.fake_sni_strategy = FKSN_STRAT_TTL;
} else if (strcmp(optarg, "none") == 0) {
config.fake_sni_strategy = FKSN_STRAT_NONE;
} else {
errno = EINVAL;
printf("Invalid option %s\n", long_opt[optIdx].name);
return -1;
}
break;
case OPT_SEG2DELAY:
num = parse_numeric_option(optarg);
if (errno != 0 || num < 0) {
printf("Invalid option %s\n", long_opt[optIdx].name);
return -1;
}
config.seg2_delay = num;
break;
case OPT_THREADS:
num = parse_numeric_option(optarg);
if (errno != 0 || num < 0 || num > MAX_THREADS) {
printf("Invalid option %s\n", long_opt[optIdx].name);
return -1;
}
config.threads = num;
break;
case OPT_FAKE_SNI_TTL:
num = parse_numeric_option(optarg);
if (errno != 0 || num < 0 || num > 255) {
printf("Invalid option %s\n", long_opt[optIdx].name);
return -1;
}
config.fake_sni_ttl = num;
break;
default:
printf("Invalid option %s\n", long_opt[optIdx].name);
errno = EINVAL;
return -1;
}
}
config.queue_start_num = parse_numeric_option(argv[optind]);
if (errno != 0) {
printf("Invalid queue numbmer\n");
return -1;
}
return 0;
}
static int open_socket(struct mnl_socket **_nl) {
struct mnl_socket *nl = NULL;
nl = mnl_socket_open(NETLINK_NETFILTER);
@ -788,9 +762,12 @@ void *init_queue_wrapper(void *qdconf) {
int main(int argc, const char *argv[]) {
if (parse_args(argc, argv)) {
if (errno) {
perror("Unable to parse args");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
switch (config.fragmentation_strategy) {
case FRAG_STRAT_TCP: