141 lines
4.1 KiB
C
141 lines
4.1 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* main.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: jhalford <jack@crans.org> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2017/04/22 14:10:24 by jhalford #+# #+# */
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/* Updated: 2017/10/08 14:35:02 by jhalford ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "ping.h"
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#define TIME_START 0 #define TIME_END 1
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#define TIME_TRIPTIME 2
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t_ping g_ping =
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{
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.pid = -1,
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.pkt_sent = -1,
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.pkt_recv = 0,
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};
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int resolve_host(char *node, t_ping *ping)
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{
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struct addrinfo *result;
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struct addrinfo hints;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = PF_INET;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags |= AI_CANONNAME;
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if (getaddrinfo(node, NULL, &hints, &result) != 0)
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{
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perror("getaddrinfo");
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exit(1);
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}
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ping->sa = result;
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inet_ntop(AF_INET, &(((struct sockaddr_in*)ping->sa->ai_addr)->sin_addr), ping->ip4, INET_ADDRSTRLEN);
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return (0);
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}
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void display(void *buf, int bytes, struct sockaddr *addr)
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{
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struct ip *ip;
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struct icmp *icmp;
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struct s_packet *pkt;
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int hlen;
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double triptime;
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char hbuf[NI_MAXHOST];
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char ipbuf[INET_ADDRSTRLEN];
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ip = buf;
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(void)bytes;
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hlen = ip->ip_hl << 2;
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pkt = (struct s_packet*)(buf + hlen);
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icmp = &pkt->hdr;
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if (icmp->icmp_id != g_ping.pid)
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return ;
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triptime = time_milli() - *(double*)&pkt->msg;
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rs_push(&g_ping.rs, triptime);
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g_ping.pkt_recv++;
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bzero(hbuf, NI_MAXHOST);
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bzero(ipbuf, INET_ADDRSTRLEN);
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getnameinfo(addr, sizeof(struct sockaddr_in), ipbuf, INET_ADDRSTRLEN, NULL, 0, NI_NUMERICHOST);
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if (getnameinfo(addr, sizeof(struct sockaddr_in), hbuf, NI_MAXHOST, NULL, 0, 0) == 0)
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printf("%d bytes from %s (%s): icmp_seq=%d ttl=%i time=%.1f ms\n",
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hlen, hbuf, ipbuf, icmp->icmp_seq, ip->ip_ttl, triptime);
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else
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printf("%d bytes from %s: icmp_seq=%d ttl=%i time=%.1f ms\n",
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hlen, ipbuf, icmp->icmp_seq, ip->ip_ttl, triptime);
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}
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void ping(int signo)
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{
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struct s_packet pkt;
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double epoch;
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(void)signo;
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bzero(&pkt, sizeof(pkt));
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pkt.hdr.icmp_type = ICMP_ECHO;
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pkt.hdr.icmp_id = g_ping.pid;
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pkt.hdr.icmp_seq = ++g_ping.pkt_sent;
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epoch = time_milli();
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ft_memcpy(pkt.msg, (void*)&epoch, sizeof(double));
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pkt.hdr.icmp_cksum = cksum(&pkt, sizeof(pkt));
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sendto(g_ping.sock, &pkt, sizeof(pkt), 0, g_ping.sa->ai_addr,
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sizeof(struct sockaddr));
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alarm(1);
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}
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void stats_recap(int signo)
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{
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double loss;
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(void)signo;
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rs_final(&g_ping.rs);
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loss = FT_PCT(g_ping.pkt_recv, g_ping.pkt_sent);
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printf("\n--- %s ping statistics ---", g_ping.ip4);
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printf("\n%d packets transmitted, %d packets received, %0.1f%% packet loss",
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g_ping.rs.count, g_ping.pkt_recv, loss);
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printf("\nround-trip min/avg/max/stddev = %.3f/%.3f/%.3f/%.3f ms",
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g_ping.rs.min, g_ping.rs.avg, g_ping.rs.max, g_ping.rs.stdev);
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freeaddrinfo(g_ping.sa);
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exit(0);
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}
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int main(int ac, char **av)
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{
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if (ac != 2)
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{
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ft_usage("%s <addr>\n", av[0]);
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exit(1);
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}
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resolve_host(av[1], &g_ping);
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if (g_ping.sa->ai_canonname)
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printf("PING %s (%s): %i data bytes\n",
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g_ping.sa->ai_canonname, g_ping.ip4, PACKETSIZE);
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else
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printf("PING %s: %i data bytes\n", g_ping.ip4, PACKETSIZE);
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if ((g_ping.sock = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP)) < 0)
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{
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ft_dprintf(2, "socket(2) error\n");
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exit(1);
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}
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if (setsockopt(g_ping.sock, 0, IP_TTL, (int[]){255, 0}, sizeof(int)) != 0)
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{
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ft_dprintf(2, "setsockopt(2) error\n");
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exit(1);
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}
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g_ping.pid = getpid();
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rs_init(&g_ping.rs);
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signal(SIGINT, stats_recap);
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signal(SIGALRM, ping);
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alarm(1);
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listener(PF_INET, SOCK_RAW, IPPROTO_ICMP, &display);
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return (0);
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}
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