136 lines
3.7 KiB
C
136 lines
3.7 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 14:26:15 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
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#define TIME_END 1
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#define TIME_TRIPTIME 2
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int g_pid = -1;
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int g_pkt_rec = 0;
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char g_domain[256];
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struct s_stats g_rs;
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void display(void *buf, int bytes, struct sockaddr_in *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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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_pid)
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return ;
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triptime = time_milli() - *(double*)&pkt->msg;
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rs_push(triptime);
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g_pkt_rec++;
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printf("%d bytes from %s: icmp_seq=%d ttl=%i time=%.3f ms\n",
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ip->ip_len,
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inet_ntop(AF_INET, &(addr->sin_addr), g_domain, INET_ADDRSTRLEN),
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icmp->icmp_seq, ip->ip_ttl, triptime);
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}
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void ping(struct sockaddr_in *addr)
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{
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int sd;
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int cnt;
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struct s_packet pkt;
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double epoch;
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if ((sd = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP)) < 0)
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return (perror("sender socket"));
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if (setsockopt(sd, 0, IP_TTL, (int[]){255, 0}, sizeof(int)) != 0)
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perror("set TTL option");
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cnt = 0;
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while (1)
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{
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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_pid;
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pkt.hdr.icmp_seq = cnt++;
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epoch = time_milli();
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ft_memcpy(pkt.msg, (void*)&epoch, sizeof(epoch));
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pkt.hdr.icmp_cksum = cksum(&pkt, sizeof(pkt));
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if (sendto(sd, &pkt, sizeof(pkt), 0,
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(struct sockaddr*)addr, sizeof(*addr)) <= 0)
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return (perror("sendto"));
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sleep(1);
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}
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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_calcmore();
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loss = FT_PCT(g_pkt_rec, g_rs.count);
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printf("\n--- %s ping statistics ---", g_domain);
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printf("\n%d packets transmitted, %d packets received, %0.1f%% packet loss",
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g_rs.count, g_pkt_rec, loss);
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printf("\nround-trip min/avg/max/stddev = %.3f/%.3f/%.3f/%.3f ms",
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g_rs.min, g_rs.avg, g_rs.max, g_rs.stdev);
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exit(0);
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}
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struct addrinfo *resolve_host(char *hostname)
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{
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struct addrinfo *result;
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struct addrinfo hints;
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struct sockaddr_in *addr;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = PF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags |= AI_CANONNAME;
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if (getaddrinfo(hostname, 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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addr = (struct sockaddr_in*)result->ai_addr;
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inet_ntop(AF_INET, &(addr->sin_addr), g_domain, INET_ADDRSTRLEN);
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if (result->ai_canonname)
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ft_strcpy(g_domain, result->ai_canonname);
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return (result);
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}
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int main(int ac, char **av)
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{
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struct addrinfo *result;
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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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g_pid = getpid();
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result = resolve_host(av[1]);
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if (result->ai_canonname)
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printf("PING %s (%s): %i data bytes\n",
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result->ai_canonname, g_domain, 64);
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else
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printf("PING %s: %i data bytes\n", g_domain, 64);
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if (fork() == 0)
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{
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signal(SIGINT, stats_recap);
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rs_clear();
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listener(PF_INET, SOCK_RAW, IPPROTO_ICMP, &display);
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}
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ping((struct sockaddr_in*)result->ai_addr);
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return (0);
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}
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