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async-dns: cope with larger resolv.conf

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Eg, systemd-resolved produces a huge comment at the start of its
default resolv.conf.  Buffer it into the pt_serv_buf to cope.
This commit is contained in:
Andy Green 2020-04-16 11:17:37 +01:00
parent 886a588963
commit d5cb0c6aa3
1 changed files with 10 additions and 8 deletions
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18
lib/plat/unix/unix-resolv.c
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@ -28,10 +28,12 @@ lws_async_dns_server_check_t
lws_plat_asyncdns_init(struct lws_context *context, lws_sockaddr46 *sa46)
{
lws_async_dns_server_check_t s = LADNS_CONF_SERVER_CHANGED;
char resolv[512], ads[48];
lws_sockaddr46 sa46t;
lws_tokenize_t ts;
int fd, n, ns = 0;
char ads[48], *r;
r = (char *)context->pt[0].serv_buf;
/* grab the first chunk of /etc/resolv.conf */
@ -39,17 +41,17 @@ lws_plat_asyncdns_init(struct lws_context *context, lws_sockaddr46 *sa46)
if (fd < 0)
return LADNS_CONF_SERVER_UNKNOWN;
n = read(fd, resolv, sizeof(resolv) - 1);
n = read(fd, r, context->pt_serv_buf_size - 1);
close(fd);
if (n < 0)
return LADNS_CONF_SERVER_UNKNOWN;
resolv[n] = '\0';
lws_tokenize_init(&ts, resolv, LWS_TOKENIZE_F_DOT_NONTERM |
LWS_TOKENIZE_F_NO_FLOATS |
LWS_TOKENIZE_F_NO_INTEGERS |
LWS_TOKENIZE_F_MINUS_NONTERM |
LWS_TOKENIZE_F_HASH_COMMENT);
r[n] = '\0';
lws_tokenize_init(&ts, r, LWS_TOKENIZE_F_DOT_NONTERM |
LWS_TOKENIZE_F_NO_FLOATS |
LWS_TOKENIZE_F_NO_INTEGERS |
LWS_TOKENIZE_F_MINUS_NONTERM |
LWS_TOKENIZE_F_HASH_COMMENT);
do {
ts.e = lws_tokenize(&ts);
if (ts.e != LWS_TOKZE_TOKEN) {