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websocket: improve handling of 0-len frames

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Write out 9-length frames to client's WRITEFUNCTION
Read 0-length frames from READFUNCTION *if* the function
started a new frame via `curl_ws_start_frame()`.

TODO: prevent base client reader to get stuck in EOS

refs #18286
This commit is contained in:
Stefan Eissing 2025-08-18 17:12:35 +02:00
parent 9a37dd3494
commit 476076e6c2
No known key found for this signature in database
5 changed files with 100 additions and 47 deletions
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27
tests/libtest/cli_ws_data.c
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@ -195,6 +195,8 @@ struct test_ws_m1_ctx {
char *recv_buf;
size_t send_len, nsent;
size_t recv_len, nrcvd;
int read_calls;
int write_calls;
};
static size_t test_ws_data_m1_read(char *buf, size_t nitems, size_t buflen,
@ -204,14 +206,21 @@ static size_t test_ws_data_m1_read(char *buf, size_t nitems, size_t buflen,
size_t len = nitems * buflen;
size_t left = ctx->send_len - ctx->nsent;
curl_mfprintf(stderr, "m1_read(len=%zu, left=%zu)\n", len, left);
if(left) {
ctx->read_calls++;
curl_mfprintf(stderr, "m1_read(len=%zu, left=%zu, call #%d)\n",
len, left, ctx->read_calls);
if(ctx->read_calls == 1)
curl_ws_start_frame(ctx->easy, CURLWS_BINARY, ctx->send_len);
if(left || (ctx->read_calls == 1)) {
if(left > len)
left = len;
memcpy(buf, ctx->send_buf + ctx->nsent, left);
ctx->nsent += left;
return left;
}
curl_mfprintf(stderr, "m1_read, pausing, call #%d\n",
ctx->read_calls);
return CURL_READFUNC_PAUSE;
}
@ -221,7 +230,9 @@ static size_t test_ws_data_m1_write(char *buf, size_t nitems, size_t buflen,
struct test_ws_m1_ctx *ctx = userdata;
size_t len = nitems * buflen;
curl_mfprintf(stderr, "m1_write(len=%zu)\n", len);
ctx->write_calls++;
curl_mfprintf(stderr, "m1_write(len=%zu, call +%d)\n",
len, ctx->write_calls);
if(len > (ctx->recv_len - ctx->nrcvd))
return CURL_WRITEFUNC_ERROR;
memcpy(ctx->recv_buf + ctx->nrcvd, buf, len);
@ -240,6 +251,8 @@ static CURLcode test_ws_data_m1_echo(const char *url,
struct test_ws_m1_ctx m1_ctx;
size_t i, len;
curl_mfprintf(stderr, "test_ws_data_m1_echo(min=%zu, max=%zu)\n",
plen_min, plen_max);
memset(&m1_ctx, 0, sizeof(m1_ctx));
m1_ctx.send_buf = calloc(1, plen_max + 1);
m1_ctx.recv_buf = calloc(1, plen_max + 1);
@ -278,19 +291,25 @@ static CURLcode test_ws_data_m1_echo(const char *url,
for(len = plen_min; len <= plen_max; ++len) {
/* init what we want to send and expect to receive */
curl_mfprintf(stderr, "m1_echo, iter len=%zu\n", len);
m1_ctx.send_len = len;
m1_ctx.nsent = 0;
m1_ctx.recv_len = len;
m1_ctx.nrcvd = 0;
m1_ctx.read_calls = 0;
m1_ctx.write_calls = 0;
memset(m1_ctx.recv_buf, 0, plen_max);
curl_easy_pause(m1_ctx.easy, CURLPAUSE_CONT);
for(i = 0; i < count; ++i) {
curl_mfprintf(stderr, "m1_echo, iter len=%zu, count=%zu\n", len, i);
while(1) {
int still_running; /* keep number of running handles */
CURLMcode mc = curl_multi_perform(multi, &still_running);
if(!still_running || (m1_ctx.nrcvd == m1_ctx.recv_len)) {
if(!still_running ||
(m1_ctx.read_calls && m1_ctx.write_calls &&
m1_ctx.nrcvd == m1_ctx.recv_len)) {
/* got the full echo back or failed */
break;
}