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upnphttp.c: add comments about ParseHttpHeaders()

This commit is contained in:
Thomas Bernard 2013-01-29 22:56:27 +01:00
parent ea141830f6
commit 50965a6ae1
2 changed files with 18 additions and 5 deletions
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2
miniupnpd/Changelog.txt
View File

@ -3,6 +3,8 @@ $Id: Changelog.txt,v 1.322 2013/01/29 21:52:44 nanard Exp $
2013/01/29:
upnphttp.c: Fix and comment the findendheaders() function
upnphttp.c: remove strchr() call in ParseHttpHeaders()
add comments to explain how buffer is checked before calls
to ParseHttpHeaders()
2013/01/27:
upnphttp.c: ParseHttpHeaders() now checks atoi() return

21
miniupnpd/upnphttp.c
View File

@ -71,7 +71,9 @@ Delete_upnphttp(struct upnphttp * h)
}
}
/* parse HttpHeaders of the REQUEST */
/* parse HttpHeaders of the REQUEST
* This function is called after the \r\n\r\n character
* sequence has been found in h->req_buf */
static void
ParseHttpHeaders(struct upnphttp * h)
{
@ -79,8 +81,9 @@ ParseHttpHeaders(struct upnphttp * h)
char * colon;
char * p;
int n;
if((h->req_buf == NULL) || (h->req_contentoff <= 0))
return;
line = h->req_buf;
/* TODO : check if req_buf, contentoff are ok */
while(line < (h->req_buf + h->req_contentoff))
{
colon = line;
@ -116,9 +119,7 @@ ParseHttpHeaders(struct upnphttp * h)
while(*p == ':' || *p == ' ' || *p == '\t')
p++;
while(p[n]>=' ')
{
n++;
}
if((p[0] == '"' && p[n-1] == '"')
|| (p[0] == '\'' && p[n-1] == '\''))
{
@ -212,6 +213,9 @@ intervening space) by either an integer or the keyword "infinite". */
#endif
#endif
}
/* the loop below won't run off the end of the buffer
* because the buffer is guaranteed to contain the \r\n\r\n
* character sequence */
while(!(line[0] == '\r' && line[1] == '\n'))
line++;
line += 2;
@ -534,7 +538,9 @@ ProcessHTTPUnSubscribe_upnphttp(struct upnphttp * h, const char * path)
#endif
/* Parse and process Http Query
* called once all the HTTP headers have been received. */
* called once all the HTTP headers have been received,
* so it is guaranteed that h->req_buf contains the \r\n\r\n
* character sequence */
static void
ProcessHttpQuery_upnphttp(struct upnphttp * h)
{
@ -567,6 +573,9 @@ ProcessHttpQuery_upnphttp(struct upnphttp * h)
p = h->req_buf;
if(!p)
return;
/* note : checking (*p != '\r') is enough to avoid runing off the
* end of the buffer, because h->req_buf is guaranteed to contain
* the \r\n\r\n character sequence */
for(i = 0; i<15 && *p != ' ' && *p != '\r'; i++)
HttpCommand[i] = *(p++);
HttpCommand[i] = '\0';
@ -701,6 +710,8 @@ Process_upnphttp(struct upnphttp * h)
endheaders = findendheaders(h->req_buf, h->req_buflen);
if(endheaders)
{
/* at this point, the request buffer (h->req_buf)
* is guaranteed to contain the \r\n\r\n character sequence */
h->req_contentoff = endheaders - h->req_buf + 4;
ProcessHttpQuery_upnphttp(h);
}