mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-01 19:28:46 +00:00
68c7c9c1e0
- Use good ELF technique in cosmo_dlopen() - Make strerror() conform more to other libc impls - Introduce __clear_cache() and use it in cosmo_dlopen() - Remove libc/fmt/fmt.h header (trying to kill off LIBC_FMT)
128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
#if 0
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/*─────────────────────────────────────────────────────────────────╗
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│ To the extent possible under law, Justine Tunney has waived │
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│ all copyright and related or neighboring rights to this file, │
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│ as it is written in the following disclaimers: │
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│ • http://unlicense.org/ │
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│ • http://creativecommons.org/publicdomain/zero/1.0/ │
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╚─────────────────────────────────────────────────────────────────*/
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#endif
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#include "libc/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/timeval.h"
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#include "libc/errno.h"
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#include "libc/fmt/conv.h"
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#include "libc/fmt/magnumstrs.internal.h"
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#include "libc/mem/alloca.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/sock.h"
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#include "libc/sock/struct/sockaddr.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/af.h"
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#include "libc/sysv/consts/ipproto.h"
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#include "libc/sysv/consts/so.h"
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#include "libc/sysv/consts/sock.h"
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#include "libc/sysv/consts/sol.h"
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#include "net/http/ip.h"
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/**
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* @fileoverview fast local network port scanner, e.g.
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*
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* make -j8 o//examples/portscan.com
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* o//examples/portscan.com 10.10.10.0/24 22
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*/
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const char *FormatIp(char buf[16], uint32_t ip) {
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snprintf(buf, 16, "%hhu.%hhu.%hhu.%hhu", ip >> 24, ip >> 16, ip >> 8, ip);
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return buf;
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}
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#define FormatIp(x) FormatIp(alloca(16), x)
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int main(int argc, char *argv[]) {
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int port;
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struct Cidr in;
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uint32_t netmask;
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const char *status;
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struct timeval timeout;
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uint32_t network_address;
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uint32_t last_host_address;
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uint32_t first_host_address;
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if (argc != 3) {
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PrintUsage:
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fprintf(stderr,
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"usage: %s IP/CIDR PORT\n"
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"example: %s 192.168.0.0/24 22\n",
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argv[0], argv[0]);
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return 1;
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}
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in = ParseCidr(argv[1], -1);
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if (in.addr == -1) {
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fprintf(stderr, "error: bad ip/cidr\n");
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goto PrintUsage;
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}
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port = atoi(argv[2]);
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if (!(1 <= port && port <= 65535)) {
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fprintf(stderr, "error: bad port\n");
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goto PrintUsage;
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}
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if (in.cidr > 30) {
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fprintf(stderr, "error: maximum supported cidr is 30\n");
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goto PrintUsage;
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}
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if (in.cidr < 22) {
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fprintf(stderr, "error: minimum cidr support right now is 22\n");
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goto PrintUsage;
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}
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netmask = -1u << (32 - in.cidr);
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network_address = in.addr & netmask;
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first_host_address = network_address + 1;
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last_host_address = (network_address | ~netmask) - 1;
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assert(last_host_address > first_host_address);
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assert(last_host_address - first_host_address < 1024);
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fprintf(stderr, "scanning %s through %s\n", FormatIp(first_host_address),
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FormatIp(last_host_address));
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timeout = timeval_frommillis(100);
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for (int64_t ip = first_host_address; ip <= last_host_address; ++ip) {
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if (!fork()) {
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socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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setsockopt(3, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
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setsockopt(3, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
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if (!connect(3,
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(struct sockaddr *)&(struct sockaddr_in){
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.sin_family = AF_INET,
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.sin_addr.s_addr = htonl(ip),
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.sin_port = htons(port),
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},
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sizeof(struct sockaddr_in))) {
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status = "open";
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} else if (errno == ECONNREFUSED) {
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status = "closed";
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} else if (errno != EINPROGRESS) {
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status = _strerrno(errno);
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} else {
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status = 0;
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}
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if (status) {
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printf("%-15s %s\n", FormatIp(ip), status);
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}
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_Exit(0);
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}
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}
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for (;;) {
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if (wait(0) == -1 && errno == ECHILD) {
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break;
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}
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}
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}
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