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examples/http2-serverpush: add some sensible error checks

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To avoid NULL pointer dereferences etc in the case of problems.

Closes #3580
This commit is contained in:
Daniel Stenberg 2019-02-18 09:07:34 +01:00
parent f26bc29cfe
commit af143ef45e
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1 changed files with 15 additions and 4 deletions
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19
docs/examples/http2-serverpush.c
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@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -128,9 +128,12 @@ int my_trace(CURL *handle, curl_infotype type,
#define OUTPUTFILE "dl"
static void setup(CURL *hnd)
static int setup(CURL *hnd)
{
FILE *out = fopen(OUTPUTFILE, "wb");
if(!out)
/* failed */
return 1;
/* write to this file */
curl_easy_setopt(hnd, CURLOPT_WRITEDATA, out);
@ -153,7 +156,7 @@ static void setup(CURL *hnd)
/* wait for pipe connection to confirm */
curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
#endif
return 0; /* all is good */
}
/* called when there's an incoming push */
@ -176,6 +179,11 @@ static int server_push_callback(CURL *parent,
/* here's a new stream, save it in a new file for each new push */
out = fopen(filename, "wb");
if(!out) {
/* if we can't save it, deny it */
fprintf(stderr, "Failed to create output file for push\n");
return CURL_PUSH_DENY;
}
/* write to this file */
curl_easy_setopt(easy, CURLOPT_WRITEDATA, out);
@ -215,7 +223,10 @@ int main(void)
easy = curl_easy_init();
/* set options */
setup(easy);
if(setup(easy)) {
fprintf(stderr, "failed\n");
return 1;
}
/* add the easy transfer */
curl_multi_add_handle(multi_handle, easy);