mirror of
https://github.com/SerenityOS/serenity
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![Andreas Kling](/assets/img/avatar_default.png)
As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
185 lines
5.8 KiB
C++
185 lines
5.8 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <netinet/ip_icmp.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <time.h>
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#include <unistd.h>
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uint16_t internet_checksum(const void* ptr, size_t count)
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{
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uint32_t checksum = 0;
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auto* w = (const uint16_t*)ptr;
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while (count > 1) {
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checksum += ntohs(*w++);
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if (checksum & 0x80000000)
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checksum = (checksum & 0xffff) | (checksum >> 16);
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count -= 2;
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}
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while (checksum >> 16)
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checksum = (checksum & 0xffff) + (checksum >> 16);
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return htons(~checksum);
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}
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int main(int argc, char** argv)
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{
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if (pledge("stdio id inet dns", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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if (argc != 2) {
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printf("usage: ping <host>\n");
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return 0;
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}
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int fd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
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if (fd < 0) {
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perror("socket");
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return 1;
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}
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if (setgid(getgid()) || setuid(getuid())) {
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fprintf(stderr, "Failed to drop privileges.\n");
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return 1;
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}
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if (pledge("stdio inet dns", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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struct timeval timeout {
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1, 0
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};
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int rc = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
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if (rc < 0) {
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perror("setsockopt");
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return 1;
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}
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auto* hostent = gethostbyname(argv[1]);
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if (!hostent) {
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printf("Lookup failed for '%s'\n", argv[1]);
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return 1;
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}
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if (pledge("stdio inet", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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pid_t pid = getpid();
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sockaddr_in peer_address;
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memset(&peer_address, 0, sizeof(peer_address));
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peer_address.sin_family = AF_INET;
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peer_address.sin_port = 0;
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peer_address.sin_addr.s_addr = *(const in_addr_t*)hostent->h_addr_list[0];
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struct PingPacket {
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struct icmphdr header;
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char msg[64 - sizeof(struct icmphdr)];
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};
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uint16_t seq = 1;
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for (;;) {
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PingPacket ping_packet;
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PingPacket pong_packet;
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memset(&ping_packet, 0, sizeof(PingPacket));
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ping_packet.header.type = 8; // Echo request
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ping_packet.header.code = 0;
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ping_packet.header.un.echo.id = htons(pid);
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ping_packet.header.un.echo.sequence = htons(seq++);
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strcpy(ping_packet.msg, "Hello there!\n");
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ping_packet.header.checksum = internet_checksum(&ping_packet, sizeof(PingPacket));
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struct timeval tv_send;
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gettimeofday(&tv_send, nullptr);
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rc = sendto(fd, &ping_packet, sizeof(PingPacket), 0, (const struct sockaddr*)&peer_address, sizeof(sockaddr_in));
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if (rc < 0) {
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perror("sendto");
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return 1;
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}
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for (;;) {
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socklen_t peer_address_size = sizeof(peer_address);
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rc = recvfrom(fd, &pong_packet, sizeof(PingPacket), 0, (struct sockaddr*)&peer_address, &peer_address_size);
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if (rc < 0) {
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if (errno == EAGAIN) {
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printf("Request (seq=%u) timed out.\n", ntohs(ping_packet.header.un.echo.sequence));
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break;
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}
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perror("recvfrom");
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return 1;
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}
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if (pong_packet.header.type != 0)
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continue;
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if (pong_packet.header.code != 0)
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continue;
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if (ntohs(pong_packet.header.un.echo.id) != pid)
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continue;
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struct timeval tv_receive;
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gettimeofday(&tv_receive, nullptr);
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struct timeval tv_diff;
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timersub(&tv_receive, &tv_send, &tv_diff);
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int ms = tv_diff.tv_sec * 1000 + tv_diff.tv_usec / 1000;
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char addr_buf[64];
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printf("Pong from %s: id=%u, seq=%u%s, time=%dms\n",
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inet_ntop(AF_INET, &peer_address.sin_addr, addr_buf, sizeof(addr_buf)),
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ntohs(pong_packet.header.un.echo.id),
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ntohs(pong_packet.header.un.echo.sequence),
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pong_packet.header.un.echo.sequence != ping_packet.header.un.echo.sequence ? "(!)" : "",
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ms);
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// If this was a response to an earlier packet, we still need to wait for the current one.
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if (pong_packet.header.un.echo.sequence != ping_packet.header.un.echo.sequence)
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continue;
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break;
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}
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sleep(1);
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}
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return 0;
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}
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