mirror of
https://github.com/9fans/plan9port.git
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53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
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#include <u.h>
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#define NOPLAN9DEFINES
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#include <libc.h>
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#include <ip.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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/*
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* prefix of all v4 addresses
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* copied from libip because libc cannot depend on libip
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*/
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static uchar v4prefix[IPaddrlen] = {
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0, 0, 0, 0,
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0, 0, 0, 0,
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0, 0, 0xff, 0xff,
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0, 0, 0, 0
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};
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long
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udpread(int fd, Udphdr *hdr, void *buf, long n)
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{
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struct sockaddr_in sin;
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socklen_t len;
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len = sizeof sin;
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n = recvfrom(fd, buf, n, 0, (struct sockaddr*)&sin, &len);
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if(n < 0)
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return -1;
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if(len != sizeof sin){
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werrstr("recvfrom acting weird");
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return -1;
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}
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memset(hdr, 0, sizeof *hdr);
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memmove(hdr->raddr, v4prefix, IPaddrlen);
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*(u32int*)(hdr->raddr+12) = *(u32int*)&sin.sin_addr;
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*(u16int*)hdr->rport = *(u16int*)&sin.sin_port;
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return n;
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}
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long
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udpwrite(int fd, Udphdr *hdr, void *buf, long n)
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{
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struct sockaddr_in sin;
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memset(&sin, 0, sizeof sin);
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sin.sin_family = AF_INET;
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*(u32int*)&sin.sin_addr = *(u32int*)(hdr->raddr+12);
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*(u16int*)&sin.sin_port = *(u16int*)hdr->rport;
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return sendto(fd, buf, n, 0, (struct sockaddr*)&sin, sizeof sin);
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}
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