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DEV: udp: add support for random packet corruption

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-c sets a corruption rate in % of the packets.
-o sets the start offset of the area to be corrupted.
-w sets the length of the area to be corrupted.

A single byte within that area will then be randomly XORed with a
random value.
This commit is contained in:
Willy Tarreau 2022-03-16 15:07:51 +01:00
parent 04d3c5cd1f
commit 42cef2a18f
1 changed files with 24 additions and 1 deletions
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25
dev/udp/udp-perturb.c
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@ -77,6 +77,9 @@ struct {
} history[MAXREORDER]; } history[MAXREORDER];
int history_idx = 0; int history_idx = 0;
unsigned int rand_rate = 0; unsigned int rand_rate = 0;
unsigned int corr_rate = 0;
unsigned int corr_span = 1;
unsigned int corr_base = 0;
struct conn conns[MAXCONN]; // sole connection for now struct conn conns[MAXCONN]; // sole connection for now
int fd_frt; int fd_frt;
@ -319,6 +322,14 @@ int handle_frt(int fd, struct pollfd *pfd, struct conn *conns, int nbconn)
if (ret < 0) if (ret < 0)
return errno == EAGAIN ? 0 : -1; return errno == EAGAIN ? 0 : -1;
if (corr_rate > 0 && prng(100) < corr_rate) {
unsigned int rnd = prng(corr_span * 256); // pos and value
unsigned int pos = corr_base + (rnd >> 8);
if (pos < ret)
pktbuf[pos] ^= rnd;
}
conn = NULL; conn = NULL;
for (i = 0; i < nbconn; i++) { for (i = 0; i < nbconn; i++) {
if (addr.ss_family != conns[i].cli_addr.ss_family) if (addr.ss_family != conns[i].cli_addr.ss_family)
@ -421,6 +432,9 @@ void usage(int status, const char *name)
" -h display this help\n" " -h display this help\n"
" -r rate reorder/duplicate/lose around <rate>%% of packets\n" " -r rate reorder/duplicate/lose around <rate>%% of packets\n"
" -s seed force initial random seed (currently %#x)\n" " -s seed force initial random seed (currently %#x)\n"
" -c rate corrupt around <rate>%% of packets\n"
" -o ofs start offset of corrupted area (def: 0)\n"
" -w width width of the corrupted area (def: 1)\n"
"", name, prng_state); "", name, prng_state);
} }
@ -435,7 +449,7 @@ int main(int argc, char **argv)
err.size = 100; err.size = 100;
err.msg = malloc(err.size); err.msg = malloc(err.size);
while ((opt = getopt(argc, argv, "hr:s:")) != -1) { while ((opt = getopt(argc, argv, "hr:s:c:o:w:")) != -1) {
switch (opt) { switch (opt) {
case 'r': // rand_rate% case 'r': // rand_rate%
rand_rate = atoi(optarg); rand_rate = atoi(optarg);
@ -443,6 +457,15 @@ int main(int argc, char **argv)
case 's': // seed case 's': // seed
prng_state = atol(optarg); prng_state = atol(optarg);
break; break;
case 'c': // corruption rate
corr_rate = atol(optarg);
break;
case 'o': // corruption offset
corr_base = atol(optarg);
break;
case 'w': // corruption width
corr_span = atol(optarg);
break;
default: // help, anything else default: // help, anything else
usage(0, argv[0]); usage(0, argv[0]);
} }