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wget: don't be careless with xstrdup'ing

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This commit is contained in:
Denis Vlasenko 2006-10-07 14:28:55 +00:00
parent a655152b00
commit 96e9d3c968
1 changed files with 24 additions and 18 deletions
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42
networking/wget.c
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@ -30,6 +30,8 @@
#endif
struct host_info {
// May be used if we ever will want to free() all xstrdup()s...
/* char *allocated; */
char *host;
int port;
char *path;
@ -136,14 +138,16 @@ int wget_main(int argc, char **argv)
struct sockaddr_in s_in;
llist_t *headers_llist = NULL;
/* server.allocated = target.allocated = NULL; */
FILE *sfp = NULL; /* socket to web/ftp server */
FILE *dfp = NULL; /* socket to ftp server (data) */
char *fname_out = NULL; /* where to direct output (-O) */
int got_clen = 0; /* got content-length: from server */
int output_fd = -1;
int use_proxy = 1; /* Use proxies if env vars are set */
char *proxy_flag = "on"; /* Use proxies if env vars are set */
char *user_agent = "Wget"; /* Content of the "User-Agent" header field */
const char *proxy_flag = "on"; /* Use proxies if env vars are set */
const char *user_agent = "Wget";/* Content of the "User-Agent" header field */
/*
* Crack command line.
@ -185,7 +189,7 @@ int wget_main(int argc, char **argv)
if (use_proxy) {
proxy = getenv(target.is_ftp ? "ftp_proxy" : "http_proxy");
if (proxy && *proxy) {
parse_url(xstrdup(proxy), &server);
parse_url(proxy, &server);
} else {
use_proxy = 0;
}
@ -306,14 +310,14 @@ read_response:
if (fgets(buf, sizeof(buf), sfp) == NULL)
bb_error_msg_and_die("no response from server");
for (s = buf ; *s != '\0' && !isspace(*s) ; ++s)
;
for ( ; isspace(*s) ; ++s)
;
s = buf;
while (*s != '\0' && !isspace(*s)) ++s;
while (isspace(*s)) ++s;
switch (status = atoi(s)) {
case 0:
case 100:
while (gethdr(buf, sizeof(buf), sfp, &n) != NULL);
while (gethdr(buf, sizeof(buf), sfp, &n) != NULL)
/* eat all remaining headers */;
goto read_response;
case 200:
break;
@ -328,7 +332,7 @@ read_response:
/*FALLTHRU*/
default:
chomp(buf);
bb_error_msg_and_die("server returned error %d: %s", atoi(s), buf);
bb_error_msg_and_die("server returned error %s: %s", s, buf);
}
/*
@ -351,10 +355,10 @@ read_response:
}
if (strcasecmp(buf, "location") == 0) {
if (s[0] == '/')
// FIXME: this is dirty
target.path = xstrdup(s+1);
/* free(target.allocated); */
target.path = /* target.allocated = */ xstrdup(s+1);
else {
parse_url(xstrdup(s), &target);
parse_url(s, &target);
if (use_proxy == 0) {
server.host = target.host;
server.port = target.port;
@ -368,9 +372,9 @@ read_response:
} while(status >= 300);
dfp = sfp;
}
else
{
} else {
/*
* FTP session
*/
@ -499,9 +503,11 @@ read_response:
}
static void parse_url(char *url, struct host_info *h)
static void parse_url(char *src_url, struct host_info *h)
{
char *p, *cp, *sp, *up, *pp;
char *url, *p, *cp, *sp, *up, *pp;
/* h->allocated = */ url = xstrdup(src_url);
if (strncmp(url, "http://", 7) == 0) {
h->port = bb_lookup_port("http", "tcp", 80);
@ -517,7 +523,7 @@ static void parse_url(char *url, struct host_info *h)
// FYI:
// "Real" wget 'http://busybox.net?var=a/b' sends this request:
// 'GET /?var=a/b HTTP 1.0'
// and saves 'index.html?var=a%2Fb'
// and saves 'index.html?var=a%2Fb' (we save 'b')
// wget 'http://busybox.net?login=john@doe':
// request: 'GET /?login=john@doe HTTP/1.0'
// saves: 'index.html?login=john@doe' (we save ?login=john@doe)