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-rw-r--r--networking/httpd.c204
1 files changed, 110 insertions, 94 deletions
diff --git a/networking/httpd.c b/networking/httpd.c
index c837d67..23d442f 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -110,6 +110,7 @@
static const char default_path_httpd_conf[] ALIGN1 = "/etc";
static const char httpd_conf[] ALIGN1 = "httpd.conf";
+static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
typedef struct has_next_ptr {
struct has_next_ptr *next;
@@ -135,6 +136,7 @@ struct globals {
smallint flg_deny_all;
unsigned rmt_ip;
+// TODO: get rid of rmt_port
unsigned rmt_port; /* for set env REMOTE_PORT */
char *rmt_ip_str; /* for set env REMOTE_ADDR */
const char *bind_addr_or_port;
@@ -661,6 +663,22 @@ static char *encodeString(const char *string)
*
* Returns a pointer to the decoded string (same as input).
*/
+static unsigned hex_to_bin(unsigned char c)
+{
+ unsigned v = c | 0x20; /* lowercase */
+ v = v - '0';
+ if (v <= 9)
+ return v;
+ v = v + ('0' - 'a');
+ if (v <= 5)
+ return v + 10;
+ return ~0;
+}
+/* For testing:
+void t(char c) { printf("'%c' %u\n", c, hex_to_bin(c)); }
+int main() { t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
+t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
+*/
static char *decodeString(char *orig, int option_d)
{
/* note that decoded string is always shorter than original */
@@ -669,7 +687,7 @@ static char *decodeString(char *orig, int option_d)
char c;
while ((c = *ptr++) != '\0') {
- unsigned value1, value2;
+ unsigned v;
if (option_d && c == '+') {
*string++ = ' ';
@@ -679,21 +697,23 @@ static char *decodeString(char *orig, int option_d)
*string++ = c;
continue;
}
- if (sscanf(ptr, "%1X", &value1) != 1
- || sscanf(ptr+1, "%1X", &value2) != 1
- ) {
+ v = hex_to_bin(ptr[0]);
+ if (v > 15) {
+ bad_hex:
if (!option_d)
return NULL;
*string++ = '%';
continue;
}
- value1 = value1 * 16 + value2;
- if (!option_d && (value1 == '/' || value1 == '\0')) {
+ v = (v * 16) | hex_to_bin(ptr[1]);
+ if (v > 255)
+ goto bad_hex;
+ if (!option_d && (v == '/' || v == '\0')) {
/* caller takes it as indication of invalid
* (dangerous wrt exploits) chars */
return orig + 1;
}
- *string++ = value1;
+ *string++ = v;
ptr += 2;
}
*string = '\0';
@@ -1188,13 +1208,13 @@ static void send_cgi_and_exit(
/* Are we still buffering CGI output? */
if (buf_count >= 0) {
- /* According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
+ /* HTTP_200[] has single "\r\n" at the end.
+ * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
* CGI scripts MUST send their own header terminated by
* empty line, then data. That's why we have only one
* <cr><lf> pair here. We will output "200 OK" line
* if needed, but CGI still has to provide blank line
* between header and body */
- static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
/* Must use safe_read, not full_read, because
* CGI may output a few first bytes and then wait
@@ -1489,12 +1509,11 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
{
static const char request_GET[] ALIGN1 = "GET";
- char *url;
- char *purl;
- int count;
- int http_major_version;
- char *test;
struct stat sb;
+ char *urlcopy;
+ char *urlp;
+ char *tptr;
+ int http_major_version;
int ip_allowed;
#if ENABLE_FEATURE_HTTPD_CGI
const char *prequest;
@@ -1535,58 +1554,57 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
sigaction(SIGALRM, &sa, NULL);
alarm(HEADER_READ_TIMEOUT);
- if (!get_line()) {
- /* EOF or error or empty line */
+ if (!get_line()) /* EOF or error or empty line */
send_headers_and_exit(HTTP_BAD_REQUEST);
- }
/* Determine type of request (GET/POST) */
- purl = strpbrk(iobuf, " \t");
- if (purl == NULL) {
+ urlp = strpbrk(iobuf, " \t");
+ if (urlp == NULL)
send_headers_and_exit(HTTP_BAD_REQUEST);
- }
- *purl = '\0';
+ *urlp++ = '\0';
#if ENABLE_FEATURE_HTTPD_CGI
prequest = request_GET;
if (strcasecmp(iobuf, prequest) != 0) {
prequest = "POST";
- if (strcasecmp(iobuf, prequest) != 0) {
+ if (strcasecmp(iobuf, prequest) != 0)
send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
- }
}
#else
- if (strcasecmp(iobuf, request_GET) != 0) {
+ if (strcasecmp(iobuf, request_GET) != 0)
send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
- }
#endif
- *purl = ' ';
+ urlp = skip_whitespace(urlp);
+ if (urlp[0] != '/')
+ send_headers_and_exit(HTTP_BAD_REQUEST);
- /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
+ /* Find end of URL and parse HTTP version, if any */
http_major_version = -1;
- count = sscanf(purl, " %[^ ] HTTP/%d.%*d", iobuf, &http_major_version);
- if (count < 1 || iobuf[0] != '/') {
- /* Garbled request/URL */
- send_headers_and_exit(HTTP_BAD_REQUEST);
- }
- url = alloca(strlen(iobuf) + sizeof("/index.html"));
- if (url == NULL) {
- send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
- }
- strcpy(url, iobuf);
+ tptr = strchrnul(urlp, ' ');
+ /* Is it " HTTP/"? */
+ if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0)
+ http_major_version = (tptr[6] - '0');
+ *tptr = '\0';
+
+ /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
+ urlcopy = alloca((tptr - urlp) + sizeof("/index.html"));
+ /*if (urlcopy == NULL)
+ * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
+ strcpy(urlcopy, urlp);
+ /* NB: urlcopy ptr is never changed after this */
/* Extract url args if present */
- test = strchr(url, '?');
+ tptr = strchr(urlcopy, '?');
g_query = NULL;
- if (test) {
- *test++ = '\0';
- g_query = test;
+ if (tptr) {
+ *tptr++ = '\0';
+ g_query = tptr;
}
/* Decode URL escape sequences */
- test = decodeString(url, 0);
- if (test == NULL)
+ tptr = decodeString(urlcopy, 0);
+ if (tptr == NULL)
send_headers_and_exit(HTTP_BAD_REQUEST);
- if (test == url + 1) {
+ if (tptr == urlcopy + 1) {
/* '/' or NUL is encoded */
send_headers_and_exit(HTTP_NOT_FOUND);
}
@@ -1594,60 +1612,58 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
/* Canonicalize path */
/* Algorithm stolen from libbb bb_simplify_path(),
* but don't strdup and reducing trailing slash and protect out root */
- purl = test = url;
+ urlp = tptr = urlcopy;
do {
- if (*purl == '/') {
+ if (*urlp == '/') {
/* skip duplicate (or initial) slash */
- if (*test == '/') {
+ if (*tptr == '/') {
continue;
}
- if (*test == '.') {
+ if (*tptr == '.') {
/* skip extra '.' */
- if (test[1] == '/' || !test[1]) {
+ if (tptr[1] == '/' || !tptr[1]) {
continue;
}
/* '..': be careful */
- if (test[1] == '.' && (test[2] == '/' || !test[2])) {
- ++test;
- if (purl == url) {
- /* protect root */
+ if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
+ ++tptr;
+ if (urlp == urlcopy) /* protect root */
send_headers_and_exit(HTTP_BAD_REQUEST);
- }
- while (*--purl != '/') /* omit previous dir */;
+ while (*--urlp != '/') /* omit previous dir */;
continue;
}
}
}
- *++purl = *test;
- } while (*++test);
- *++purl = '\0'; /* so keep last character */
- test = purl; /* end ptr */
+ *++urlp = *tptr;
+ } while (*++tptr);
+ *++urlp = '\0'; /* so keep last character */
+ tptr = urlp; /* end ptr */
/* If URL is a directory, add '/' */
- if (test[-1] != '/') {
- if (is_directory(url + 1, 1, &sb)) {
- found_moved_temporarily = url;
+ if (tptr[-1] != '/') {
+ if (is_directory(urlcopy + 1, 1, &sb)) {
+ found_moved_temporarily = urlcopy;
}
}
/* Log it */
if (verbose > 1)
- bb_error_msg("url:%s", url);
+ bb_error_msg("url:%s", urlcopy);
- test = url;
+ tptr = urlcopy;
ip_allowed = checkPermIP();
- while (ip_allowed && (test = strchr(test + 1, '/')) != NULL) {
+ while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
/* have path1/path2 */
- *test = '\0';
- if (is_directory(url + 1, 1, &sb)) {
+ *tptr = '\0';
+ if (is_directory(urlcopy + 1, 1, &sb)) {
/* may be having subdir config */
- parse_conf(url + 1, SUBDIR_PARSE);
+ parse_conf(urlcopy + 1, SUBDIR_PARSE);
ip_allowed = checkPermIP();
}
- *test = '/';
+ *tptr = '/';
}
if (http_major_version >= 0) {
- /* Request was with "... HTTP/n.m", and n >= 0 */
+ /* Request was with "... HTTP/nXXX", and n >= 0 */
/* Read until blank line for HTTP version specified, else parse immediate */
while (1) {
@@ -1662,16 +1678,16 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
/* extra read only for POST */
if (prequest != request_GET) {
- test = iobuf + sizeof("Content-length:") - 1;
- if (!test[0])
+ tptr = iobuf + sizeof("Content-length:") - 1;
+ if (!tptr[0])
send_headers_and_exit(HTTP_BAD_REQUEST);
errno = 0;
/* not using strtoul: it ignores leading minus! */
- length = strtol(test, &test, 10);
+ length = strtol(tptr, &tptr, 10);
/* length is "ulong", but we need to pass it to int later */
/* so we check for negative or too large values in one go: */
/* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
- if (test[0] || errno || length > INT_MAX)
+ if (tptr[0] || errno || length > INT_MAX)
send_headers_and_exit(HTTP_BAD_REQUEST);
}
} else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
@@ -1690,13 +1706,13 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
* It shows up as "Authorization: Basic <userid:password>" where
* the userid:password is base64 encoded.
*/
- test = skip_whitespace(iobuf + sizeof("Authorization:")-1);
- if (STRNCASECMP(test, "Basic") != 0)
+ tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
+ if (STRNCASECMP(tptr, "Basic") != 0)
continue;
- test += sizeof("Basic")-1;
+ tptr += sizeof("Basic")-1;
/* decodeBase64() skips whitespace itself */
- decodeBase64(test);
- credentials = checkPerm(url, test);
+ decodeBase64(tptr);
+ credentials = checkPerm(urlcopy, tptr);
}
#endif /* FEATURE_HTTPD_BASIC_AUTH */
} /* while extra header reading */
@@ -1705,13 +1721,13 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
/* We read headers, disable peer timeout */
alarm(0);
- if (strcmp(bb_basename(url), httpd_conf) == 0 || ip_allowed == 0) {
+ if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || ip_allowed == 0) {
/* protect listing [/path]/httpd_conf or IP deny */
send_headers_and_exit(HTTP_FORBIDDEN);
}
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
- if (credentials <= 0 && checkPerm(url, ":") == 0) {
+ if (credentials <= 0 && checkPerm(urlcopy, ":") == 0) {
send_headers_and_exit(HTTP_UNAUTHORIZED);
}
#endif
@@ -1720,24 +1736,24 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
}
- test = url + 1; /* skip first '/' */
+ tptr = urlcopy + 1; /* skip first '/' */
#if ENABLE_FEATURE_HTTPD_CGI
- if (strncmp(test, "cgi-bin/", 8) == 0) {
- if (test[8] == '\0') {
+ if (strncmp(tptr, "cgi-bin/", 8) == 0) {
+ if (tptr[8] == '\0') {
/* protect listing "cgi-bin/" */
send_headers_and_exit(HTTP_FORBIDDEN);
}
- send_cgi_and_exit(url, prequest, length, cookie, content_type);
+ send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
}
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
{
- char *suffix = strrchr(test, '.');
+ char *suffix = strrchr(tptr, '.');
if (suffix) {
Htaccess *cur;
for (cur = script_i; cur; cur = cur->next) {
if (strcmp(cur->before_colon + 1, suffix) == 0) {
- send_cgi_and_exit(url, prequest, length, cookie, content_type);
+ send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
}
}
}
@@ -1748,20 +1764,20 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
}
#endif /* FEATURE_HTTPD_CGI */
- if (purl[-1] == '/')
- strcpy(purl, "index.html");
- if (stat(test, &sb) == 0) {
+ if (urlp[-1] == '/')
+ strcpy(urlp, "index.html");
+ if (stat(tptr, &sb) == 0) {
/* It's a dir URL and there is index.html */
ContentLength = sb.st_size;
last_mod = sb.st_mtime;
}
#if ENABLE_FEATURE_HTTPD_CGI
- else if (purl[-1] == '/') {
+ else if (urlp[-1] == '/') {
/* It's a dir URL and there is no index.html
* Try cgi-bin/index.cgi */
if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
- purl[0] = '\0';
- g_query = url;
+ urlp[0] = '\0';
+ g_query = urlcopy;
send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
}
}
@@ -1771,7 +1787,7 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
* }
*/
- send_file_and_exit(test);
+ send_file_and_exit(tptr);
#if 0 /* Is this needed? Why? */
if (DEBUG)
generated by cgit v1.1 at 2024-12-29 14:54:54 +0000