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41dadaedb7
avoid a "pointer targets differ in signedness" warning. Add a check for socklen_t in configure.in; if it's not present, typedef it to int.
105 lines
1.8 KiB
C
105 lines
1.8 KiB
C
/*
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* ip.c
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*
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* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
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*
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* $Id: ip.c 547 2005-01-25 21:30:40Z dugsong $
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*/
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#include "config.h"
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#include <netinet/in.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "dnet.h"
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struct ip_handle {
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int fd;
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};
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ip_t *
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ip_open(void)
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{
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ip_t *i;
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int n;
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socklen_t len;
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if ((i = calloc(1, sizeof(*i))) == NULL)
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return (NULL);
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if ((i->fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
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return (ip_close(i));
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#ifdef IP_HDRINCL
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n = 1;
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if (setsockopt(i->fd, IPPROTO_IP, IP_HDRINCL, &n, sizeof(n)) < 0)
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return (ip_close(i));
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#endif
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#ifdef SO_SNDBUF
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len = sizeof(n);
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if (getsockopt(i->fd, SOL_SOCKET, SO_SNDBUF, &n, &len) < 0)
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return (ip_close(i));
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for (n += 128; n < 1048576; n += 128) {
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if (setsockopt(i->fd, SOL_SOCKET, SO_SNDBUF, &n, len) < 0) {
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if (errno == ENOBUFS)
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break;
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return (ip_close(i));
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}
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}
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#endif
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#ifdef SO_BROADCAST
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n = 1;
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if (setsockopt(i->fd, SOL_SOCKET, SO_BROADCAST, &n, sizeof(n)) < 0)
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return (ip_close(i));
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#endif
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return (i);
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}
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ssize_t
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ip_send(ip_t *i, const void *buf, size_t len)
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{
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struct ip_hdr *ip;
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struct sockaddr_in sin;
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ip = (struct ip_hdr *)buf;
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memset(&sin, 0, sizeof(sin));
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#ifdef HAVE_SOCKADDR_SA_LEN
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sin.sin_len = sizeof(sin);
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#endif
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = ip->ip_dst;
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#ifdef HAVE_RAWIP_HOST_OFFLEN
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ip->ip_len = ntohs(ip->ip_len);
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ip->ip_off = ntohs(ip->ip_off);
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len = sendto(i->fd, buf, len, 0,
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(struct sockaddr *)&sin, sizeof(sin));
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ip->ip_len = htons(ip->ip_len);
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ip->ip_off = htons(ip->ip_off);
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return (len);
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#else
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return (sendto(i->fd, buf, len, 0,
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(struct sockaddr *)&sin, sizeof(sin)));
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#endif
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}
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ip_t *
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ip_close(ip_t *i)
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{
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if (i != NULL) {
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if (i->fd >= 0)
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close(i->fd);
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free(i);
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}
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return (NULL);
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}
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