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#include <errno.h>
#include <error.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/mman.h>
#include <netinet/in.h>
#include "crc32.h"
#include "mcast_image.h"
int tx_rate = 80000;
int pkt_delay = 12500 * PKT_SIZE / 1024;
int main(int argc, char **argv)
{
struct addrinfo *ai;
struct addrinfo hints;
struct addrinfo *runp;
int ret;
int sock;
struct image_pkt pktbuf;
int rfd;
struct stat st;
int writeerrors = 0;
long usec_per_tick = 1000000 / sysconf(_SC_CLK_TCK);
long delay_accum = 0;
uint32_t erasesize;
unsigned char parbuf[PKT_SIZE];
unsigned char *image, *blockptr;
uint32_t block_nr;
uint32_t block_ofs;
int nr_blocks;
uint32_t droppoint = -1;
if (argc == 6) {
tx_rate = atol(argv[5]) * 1024;
if (tx_rate < PKT_SIZE || tx_rate > 20000000) {
fprintf(stderr, "Bogus TX rate %d KiB/s\n", tx_rate);
exit(1);
}
argc = 5;
}
if (argc != 5) {
fprintf(stderr, "usage: %s <host> <port> <image> <erasesize> [<tx_rate>]\n",
(strrchr(argv[0], '/')?:argv[0]-1)+1);
exit(1);
}
pkt_delay = (PKT_SIZE * 1000000) / tx_rate;
printf("Inter-packet delay (avg): %dµs\n", pkt_delay);
printf("Transmit rate: %d KiB/s\n", tx_rate / 1024);
erasesize = atol(argv[4]);
if (!erasesize) {
fprintf(stderr, "erasesize cannot be zero\n");
exit(1);
}
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_ADDRCONFIG;
hints.ai_socktype = SOCK_DGRAM;
ret = getaddrinfo(argv[1], argv[2], &hints, &ai);
if (ret) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ret));
exit(1);
}
runp = ai;
for (runp = ai; runp; runp = runp->ai_next) {
sock = socket(runp->ai_family, runp->ai_socktype,
runp->ai_protocol);
if (sock == -1) {
perror("socket");
continue;
}
if (connect(sock, runp->ai_addr, runp->ai_addrlen) == 0)
break;
perror("connect");
close(sock);
}
if (!runp)
exit(1);
rfd = open(argv[3], O_RDONLY);
if (rfd < 0) {
perror("open");
exit(1);
}
if (fstat(rfd, &st)) {
perror("fstat");
exit(1);
}
if (st.st_size % erasesize) {
fprintf(stderr, "Image size %ld bytes is not a multiple of erasesize %d bytes\n",
st.st_size, erasesize);
exit(1);
}
image = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, rfd, 0);
if (image == MAP_FAILED) {
perror("mmap");
exit(1);
}
nr_blocks = st.st_size / erasesize;
pktbuf.hdr.totcrc = htonl(crc32(-1, image, st.st_size));
pktbuf.hdr.nr_blocks = htonl(nr_blocks);
pktbuf.hdr.blocksize = htonl(erasesize);
blockptr = image;
for (block_nr = 0; block_nr < nr_blocks; block_nr++) {
int len;
int dropped = 0;
pktbuf.hdr.block_nr = htonl(block_nr);
for (block_ofs = 0; block_ofs <= erasesize; block_ofs += len) {
int i;
if (block_ofs + PKT_SIZE > erasesize)
len = erasesize - block_ofs;
else
len = PKT_SIZE;
if (block_ofs == erasesize) {
printf("\rSending parity block: %08x", block_nr * erasesize);
len = PKT_SIZE;
memcpy(pktbuf.data, parbuf, PKT_SIZE);
} else {
if (!block_ofs)
memcpy(parbuf, blockptr, PKT_SIZE);
else for (i=0; i < len; i++)
parbuf[i] ^= blockptr[i];
memcpy(pktbuf.data, blockptr, len);
printf("\rSending data block at %08x",
block_nr * erasesize + block_ofs);
blockptr += len;
}
fflush(stdout);
pktbuf.hdr.thislen = htonl(len);
pktbuf.hdr.block_ofs = htonl(block_ofs);
pktbuf.hdr.thiscrc = htonl(crc32(-1, pktbuf.data, len));
if (droppoint == block_ofs && !dropped) {
dropped = 1;
if (droppoint == 0)
droppoint = erasesize;
else if (droppoint == erasesize)
droppoint = ((erasesize - 1) / PKT_SIZE) * PKT_SIZE;
else droppoint -= PKT_SIZE;
printf("\nDropping data block at %08x\n", block_ofs);
continue;
}
if (write(sock, &pktbuf, sizeof(pktbuf.hdr)+len) < 0) {
perror("write");
writeerrors++;
if (writeerrors > 10) {
fprintf(stderr, "Too many consecutive write errors\n");
exit(1);
}
} else
writeerrors = 0;
/* Delay, if we are so far ahead of ourselves that we have at
least one tick to wait. */
delay_accum += pkt_delay;
if (delay_accum >= usec_per_tick) {
usleep(delay_accum);
delay_accum = 0;
}
}
}
munmap(image, st.st_size);
close(rfd);
close(sock);
printf("\n");
return 0;
}
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