diff options
Diffstat (limited to 'src/lib9/udp.c')
| -rw-r--r-- | src/lib9/udp.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/lib9/udp.c b/src/lib9/udp.c new file mode 100644 index 00000000..a1164723 --- /dev/null +++ b/src/lib9/udp.c @@ -0,0 +1,52 @@ +#include <u.h> +#define NOPLAN9DEFINES +#include <libc.h> +#include <ip.h> + +#include <sys/socket.h> +#include <netinet/in.h> + +/* + * prefix of all v4 addresses + * copied from libip because libc cannot depend on libip + */ +static uchar v4prefix[IPaddrlen] = { + 0, 0, 0, 0, + 0, 0, 0, 0, + 0, 0, 0xff, 0xff, + 0, 0, 0, 0 +}; + +long +udpread(int fd, Udphdr *hdr, void *buf, long n) +{ + struct sockaddr_in sin; + socklen_t len; + + len = sizeof sin; + n = recvfrom(fd, buf, n, 0, (struct sockaddr*)&sin, &len); + if(len != sizeof sin){ + werrstr("recvfrom acting weird"); + return -1; + } + if(n < 0) + return -1; + memset(hdr, 0, sizeof *hdr); + memmove(hdr->raddr, v4prefix, IPaddrlen); + *(u32int*)(hdr->raddr+12) = *(u32int*)&sin.sin_addr; + *(u16int*)hdr->rport = *(u16int*)&sin.sin_port; + return n; +} + +long +udpwrite(int fd, Udphdr *hdr, void *buf, long n) +{ + struct sockaddr_in sin; + + memset(&sin, 0, sizeof sin); + sin.sin_family = AF_INET; + *(u32int*)&sin.sin_addr = *(u32int*)(hdr->raddr+12); + *(u16int*)&sin.sin_port = *(u16int*)hdr->rport; + return sendto(fd, buf, n, 0, (struct sockaddr*)&sin, sizeof sin); +} + |