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WPS: Cleaned up URL parser not to modify const buffer

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There is no need to use '\0' termination here in string parsing,
so we may as well clean this up to follow the const declaration.
This commit is contained in:
Jouni Malinen 2010-10-17 20:12:54 +03:00
parent 75779589e8
commit 75c3fc2e8a
1 changed files with 14 additions and 11 deletions
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25
src/wps/wps_upnp.c
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@ -3,7 +3,7 @@
* Copyright (c) 2000-2003 Intel Corporation * Copyright (c) 2000-2003 Intel Corporation
* Copyright (c) 2006-2007 Sony Corporation * Copyright (c) 2006-2007 Sony Corporation
* Copyright (c) 2008-2009 Atheros Communications * Copyright (c) 2008-2009 Atheros Communications
* Copyright (c) 2009, Jouni Malinen <j@w1.fi> * Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
* *
* See below for more details on licensing and code history. * See below for more details on licensing and code history.
*/ */
@ -293,7 +293,8 @@ static void subscr_addr_free_all(struct subscription *s)
/* subscr_addr_add_url -- add address(es) for one url to subscription */ /* subscr_addr_add_url -- add address(es) for one url to subscription */
static void subscr_addr_add_url(struct subscription *s, const char *url) static void subscr_addr_add_url(struct subscription *s, const char *url,
size_t url_len)
{ {
int alloc_len; int alloc_len;
char *scratch_mem = NULL; char *scratch_mem = NULL;
@ -309,17 +310,19 @@ static void subscr_addr_add_url(struct subscription *s, const char *url)
int rerr; int rerr;
/* url MUST begin with http: */ /* url MUST begin with http: */
if (os_strncasecmp(url, "http://", 7)) if (url_len < 7 || os_strncasecmp(url, "http://", 7))
goto fail; goto fail;
url += 7; url += 7;
url_len -= 7;
/* allocate memory for the extra stuff we need */ /* allocate memory for the extra stuff we need */
alloc_len = (2 * (os_strlen(url) + 1)); alloc_len = 2 * (url_len + 1);
scratch_mem = os_zalloc(alloc_len); scratch_mem = os_zalloc(alloc_len);
if (scratch_mem == NULL) if (scratch_mem == NULL)
goto fail; goto fail;
mem = scratch_mem; mem = scratch_mem;
strcpy(mem, url); os_strncpy(mem, url, url_len);
wpa_printf(MSG_DEBUG, "WPS UPnP: Adding URL '%s'", mem);
domain_and_port = mem; domain_and_port = mem;
mem += 1 + os_strlen(mem); mem += 1 + os_strlen(mem);
delim = os_strchr(domain_and_port, '/'); delim = os_strchr(domain_and_port, '/');
@ -331,7 +334,7 @@ static void subscr_addr_add_url(struct subscription *s, const char *url)
} }
domain = mem; domain = mem;
strcpy(domain, domain_and_port); strcpy(domain, domain_and_port);
delim = strchr(domain, ':'); delim = os_strchr(domain, ':');
if (delim) { if (delim) {
*delim++ = 0; /* null terminate domain */ *delim++ = 0; /* null terminate domain */
if (isdigit(*delim)) if (isdigit(*delim))
@ -386,7 +389,7 @@ static void subscr_addr_add_url(struct subscription *s, const char *url)
if (path[0] != '/') if (path[0] != '/')
*mem++ = '/'; *mem++ = '/';
strcpy(mem, path); strcpy(mem, path);
mem += 1 + strlen(mem); mem += 1 + os_strlen(mem);
os_memcpy(&a->saddr, rp->ai_addr, sizeof(a->saddr)); os_memcpy(&a->saddr, rp->ai_addr, sizeof(a->saddr));
a->saddr.sin_port = htons(port); a->saddr.sin_port = htons(port);
@ -406,7 +409,8 @@ fail:
static void subscr_addr_list_create(struct subscription *s, static void subscr_addr_list_create(struct subscription *s,
const char *url_list) const char *url_list)
{ {
char *end; const char *end;
wpa_printf(MSG_DEBUG, "WPS UPnP: Parsing URL list '%s'", url_list);
for (;;) { for (;;) {
while (*url_list == ' ' || *url_list == '\t') while (*url_list == ' ' || *url_list == '\t')
url_list++; url_list++;
@ -416,9 +420,8 @@ static void subscr_addr_list_create(struct subscription *s,
end = os_strchr(url_list, '>'); end = os_strchr(url_list, '>');
if (end == NULL) if (end == NULL)
break; break;
*end++ = 0; subscr_addr_add_url(s, url_list, end - url_list);
subscr_addr_add_url(s, url_list); url_list = end + 1;
url_list = end;
} }
} }