svn commit: [26184] trunk/busybox: include libbb networking
vda at busybox.net
vda at busybox.net
Wed Apr 22 13:49:17 UTC 2009
Author: vda
Date: 2009-04-22 13:49:16 +0000 (Wed, 22 Apr 2009)
New Revision: 26184
Log:
httpd: simplify insane conf file parser
function old new delta
bb_simplify_abs_path_inplace - 98 +98
parse_expr 824 832 +8
passwd_main 1025 1027 +2
evalvar 1374 1376 +2
parse_command 1463 1460 -3
bb_simplify_path 137 55 -82
parse_conf 1572 1422 -150
------------------------------------------------------------------------------
(add/remove: 3/2 grow/shrink: 3/3 up/down: 126/-251) Total: -125 bytes
Modified:
trunk/busybox/include/libbb.h
trunk/busybox/libbb/simplify_path.c
trunk/busybox/networking/httpd.c
Changeset:
Modified: trunk/busybox/include/libbb.h
===================================================================
--- trunk/busybox/include/libbb.h 2009-04-22 07:27:22 UTC (rev 26183)
+++ trunk/busybox/include/libbb.h 2009-04-22 13:49:16 UTC (rev 26184)
@@ -1093,6 +1093,8 @@
void print_signames(void) FAST_FUNC;
char *bb_simplify_path(const char *path) FAST_FUNC;
+/* Returns ptr to NUL */
+char *bb_simplify_abs_path_inplace(char *path) FAST_FUNC;
#define FAIL_DELAY 3
extern void bb_do_delay(int seconds) FAST_FUNC;
Modified: trunk/busybox/libbb/simplify_path.c
===================================================================
--- trunk/busybox/libbb/simplify_path.c 2009-04-22 07:27:22 UTC (rev 26183)
+++ trunk/busybox/libbb/simplify_path.c 2009-04-22 13:49:16 UTC (rev 26184)
@@ -6,22 +6,13 @@
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-
#include "libbb.h"
-char* FAST_FUNC bb_simplify_path(const char *path)
+char* FAST_FUNC bb_simplify_abs_path_inplace(char *start)
{
- char *s, *start, *p;
+ char *s, *p;
- if (path[0] == '/')
- start = xstrdup(path);
- else {
- s = xrealloc_getcwd_or_warn(NULL);
- start = concat_path_file(s, path);
- free(s);
- }
p = s = start;
-
do {
if (*p == '/') {
if (*s == '/') { /* skip duplicate (or initial) slash */
@@ -47,7 +38,22 @@
if ((p == start) || (*p != '/')) { /* not a trailing slash */
++p; /* so keep last character */
}
- *p = 0;
+ *p = '\0';
+ return p;
+}
- return start;
+char* FAST_FUNC bb_simplify_path(const char *path)
+{
+ char *s, *p;
+
+ if (path[0] == '/')
+ s = xstrdup(path);
+ else {
+ p = xrealloc_getcwd_or_warn(NULL);
+ s = concat_path_file(p, path);
+ free(p);
+ }
+
+ bb_simplify_abs_path_inplace(s);
+ return s;
}
Modified: trunk/busybox/networking/httpd.c
===================================================================
--- trunk/busybox/networking/httpd.c 2009-04-22 07:27:22 UTC (rev 26183)
+++ trunk/busybox/networking/httpd.c 2009-04-22 13:49:16 UTC (rev 26184)
@@ -54,7 +54,7 @@
* /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/
* /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/
* .au:audio/basic # additional mime type for audio.au files
- * *.php:/path/php # running cgi.php scripts through an interpreter
+ * *.php:/path/php # run xxx.php through an interpreter
*
* A/D may be as a/d or allow/deny - only first char matters.
* Deny/Allow IP logic:
@@ -115,8 +115,8 @@
#define HEADER_READ_TIMEOUT 60
-static const char default_path_httpd_conf[] ALIGN1 = "/etc";
-static const char httpd_conf[] ALIGN1 = "httpd.conf";
+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 {
@@ -242,7 +242,7 @@
const char *bind_addr_or_port;
const char *g_query;
- const char *configFile;
+ const char *opt_c_configFile;
const char *home_httpd;
const char *index_page;
@@ -289,7 +289,7 @@
#define rmt_ip (G.rmt_ip )
#define bind_addr_or_port (G.bind_addr_or_port)
#define g_query (G.g_query )
-#define configFile (G.configFile )
+#define opt_c_configFile (G.opt_c_configFile )
#define home_httpd (G.home_httpd )
#define index_page (G.index_page )
#define found_mime_type (G.found_mime_type )
@@ -452,14 +452,6 @@
/*
* Parse configuration file into in-memory linked list.
*
- * The first non-white character is examined to determine if the config line
- * is one of the following:
- * .ext:mime/type # new mime type not compiled into httpd
- * [adAD]:from # ip address allow/deny, * for wildcard
- * /path:user:pass # username/password
- * Ennn:error.html # error page for status nnn
- * P:/url:[http://]hostname[:port]/new/path # reverse proxy
- *
* Any previous IP rules are discarded.
* If the flag argument is not SUBDIR_PARSE then all /path and mime rules
* are also discarded. That is, previous settings are retained if flag is
@@ -469,99 +461,136 @@
* path Path where to look for httpd.conf (without filename).
* flag Type of the parse request.
*/
-/* flag */
-#define FIRST_PARSE 0
-#define SUBDIR_PARSE 1
-#define SIGNALED_PARSE 2
-#define FIND_FROM_HTTPD_ROOT 3
+/* flag param: */
+enum {
+ FIRST_PARSE = 0, /* path will be "/etc" */
+ SIGNALED_PARSE = 1, /* path will be "/etc" */
+ SUBDIR_PARSE = 2, /* path will be derived from URL */
+};
static void parse_conf(const char *path, int flag)
{
+ /* internally used extra flag state */
+ enum { TRY_CURDIR_PARSE = 3 };
+
FILE *f;
-#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
- Htaccess *prev;
-#endif
- Htaccess *cur;
- const char *filename = configFile;
+ const char *filename;
char buf[160];
- char *p, *p0;
- char *after_colon;
- Htaccess_IP *pip;
/* discard old rules */
free_Htaccess_IP_list(&ip_a_d);
flg_deny_all = 0;
/* retain previous auth and mime config only for subdir parse */
if (flag != SUBDIR_PARSE) {
+ free_Htaccess_list(&mime_a);
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
free_Htaccess_list(&g_auth);
#endif
- free_Htaccess_list(&mime_a);
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
free_Htaccess_list(&script_i);
#endif
}
+ filename = opt_c_configFile;
if (flag == SUBDIR_PARSE || filename == NULL) {
- filename = alloca(strlen(path) + sizeof(httpd_conf) + 2);
- sprintf((char *)filename, "%s/%s", path, httpd_conf);
+ filename = alloca(strlen(path) + sizeof(HTTPD_CONF) + 2);
+ sprintf((char *)filename, "%s/%s", path, HTTPD_CONF);
}
while ((f = fopen_for_read(filename)) == NULL) {
- if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
+ if (flag >= SUBDIR_PARSE) { /* SUBDIR or TRY_CURDIR */
/* config file not found, no changes to config */
return;
}
- if (configFile && flag == FIRST_PARSE) /* if -c option given */
- bb_simple_perror_msg_and_die(filename);
- flag = FIND_FROM_HTTPD_ROOT;
- filename = httpd_conf;
+ if (flag == FIRST_PARSE) {
+ /* -c CONFFILE given, but CONFFILE doesn't exist? */
+ if (opt_c_configFile)
+ bb_simple_perror_msg_and_die(opt_c_configFile);
+ /* else: no -c, thus we looked at /etc/httpd.conf,
+ * and it's not there. try ./httpd.conf: */
+ }
+ flag = TRY_CURDIR_PARSE;
+ filename = HTTPD_CONF;
}
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
- prev = g_auth;
+ /* in "/file:user:pass" lines, we prepend path in subdirs */
+ if (flag != SUBDIR_PARSE)
+ path = "";
#endif
- /* This could stand some work */
- while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
- after_colon = NULL;
- for (p = p0; *p0 != '\0' && *p0 != '#'; p0++) {
- if (!isspace(*p0)) {
- *p++ = *p0;
- if (*p0 == ':' && after_colon == NULL)
- after_colon = p;
+ /* The lines can be:
+ *
+ * I:default_index_file
+ * H:http_home
+ * [AD]:IP[/mask] # allow/deny, * for wildcard
+ * Ennn:error.html # error page for status nnn
+ * P:/url:[http://]hostname[:port]/new/path # reverse proxy
+ * .ext:mime/type # mime type
+ * *.php:/path/php # run xxx.php through an interpreter
+ * /file:user:pass # username and password
+ */
+ while (fgets(buf, sizeof(buf), f) != NULL) {
+ unsigned strlen_buf;
+ unsigned char ch;
+ char *after_colon = NULL;
+
+ { /* remove all whitespace, and # comments */
+ char *p, *p0;
+
+ p = p0 = buf;
+ while ((ch = *p0++) != '\0' && ch != '#') {
+ if (!isspace(ch)) {
+ *p++ = ch;
+ if (ch == ':' && after_colon == NULL)
+ after_colon = p;
+ }
}
+ *p = '\0';
+ strlen_buf = p - buf;
}
- *p = '\0';
- /* test for empty or strange line */
+ /* empty or strange line? */
if (after_colon == NULL || *after_colon == '\0')
+ goto config_error;
+
+ ch = (buf[0] & ~0x20); /* toupper if it's a letter */
+
+ if (ch == 'I') {
+ index_page = xstrdup(after_colon);
continue;
- p0 = buf;
- if (*p0 == 'd' || *p0 == 'a')
- *p0 -= 0x20; /* a/d -> A/D */
- if (*after_colon == '*') {
- if (*p0 == 'D') {
- /* memorize "deny all" */
- flg_deny_all = 1;
- }
- /* skip assumed "A:*", it is a default anyway */
+ }
+
+ /* do not allow jumping around using H in subdir's configs */
+ if (flag == FIRST_PARSE && ch == 'H') {
+ home_httpd = xstrdup(after_colon);
+ xchdir(home_httpd);
continue;
}
- if (*p0 == 'A' || *p0 == 'D') {
- /* storing current config IP line */
- pip = xzalloc(sizeof(Htaccess_IP));
- if (scan_ip_mask(after_colon, &(pip->ip), &(pip->mask))) {
+ if (ch == 'A' || ch == 'D') {
+ Htaccess_IP *pip;
+
+ if (*after_colon == '*') {
+ if (ch == 'D') {
+ /* memorize "deny all" */
+ flg_deny_all = 1;
+ }
+ /* skip assumed "A:*", it is a default anyway */
+ continue;
+ }
+ /* store "allow/deny IP/mask" line */
+ pip = xzalloc(sizeof(*pip));
+ if (scan_ip_mask(after_colon, &pip->ip, &pip->mask)) {
/* IP{/mask} syntax error detected, protect all */
- *p0 = 'D';
+ ch = 'D';
pip->mask = 0;
}
- pip->allow_deny = *p0;
- if (*p0 == 'D') {
+ pip->allow_deny = ch;
+ if (ch == 'D') {
/* Deny:from_IP - prepend */
pip->next = ip_a_d;
ip_a_d = pip;
} else {
- /* A:from_IP - append (thus D precedes A) */
+ /* A:from_IP - append (thus all D's precedes A's) */
Htaccess_IP *prev_IP = ip_a_d;
if (prev_IP == NULL) {
ip_a_d = pip;
@@ -575,12 +604,12 @@
}
#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
- if (flag == FIRST_PARSE && *p0 == 'E') {
+ if (flag == FIRST_PARSE && ch == 'E') {
unsigned i;
- int status = atoi(++p0); /* error status code */
+ int status = atoi(buf + 1); /* error status code */
+
if (status < HTTP_CONTINUE) {
- bb_error_msg("config error '%s' in '%s'", buf, filename);
- continue;
+ goto config_error;
}
/* then error page; find matching status */
for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
@@ -597,7 +626,7 @@
#endif
#if ENABLE_FEATURE_HTTPD_PROXY
- if (flag == FIRST_PARSE && *p0 == 'P') {
+ if (flag == FIRST_PARSE && ch == 'P') {
/* P:/url:[http://]hostname[:port]/new/path */
char *url_from, *host_port, *url_to;
Htaccess_Proxy *proxy_entry;
@@ -605,23 +634,20 @@
url_from = after_colon;
host_port = strchr(after_colon, ':');
if (host_port == NULL) {
- bb_error_msg("config error '%s' in '%s'", buf, filename);
- continue;
+ goto config_error;
}
*host_port++ = '\0';
if (strncmp(host_port, "http://", 7) == 0)
host_port += 7;
if (*host_port == '\0') {
- bb_error_msg("config error '%s' in '%s'", buf, filename);
- continue;
+ goto config_error;
}
url_to = strchr(host_port, '/');
if (url_to == NULL) {
- bb_error_msg("config error '%s' in '%s'", buf, filename);
- continue;
+ goto config_error;
}
*url_to = '\0';
- proxy_entry = xzalloc(sizeof(Htaccess_Proxy));
+ proxy_entry = xzalloc(sizeof(*proxy_entry));
proxy_entry->url_from = xstrdup(url_from);
proxy_entry->host_port = xstrdup(host_port);
*url_to = '/';
@@ -631,115 +657,87 @@
continue;
}
#endif
+ /* the rest of directives are non-alphabetic,
+ * must avoid using "toupper'ed" ch */
+ ch = buf[0];
-#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
- if (*p0 == '/') {
- /* make full path from httpd root / current_path / config_line_path */
- const char *tp = (flag == SUBDIR_PARSE ? path : "");
- p0 = xmalloc(strlen(tp) + (after_colon - buf) + 2 + strlen(after_colon));
- after_colon[-1] = '\0';
- sprintf(p0, "/%s%s", tp, buf);
+ if (ch == '.' /* ".ext:mime/type" */
+#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
+ || (ch == '*' && buf[1] == '.') /* "*.php:/path/php" */
+#endif
+ ) {
+ char *p;
+ Htaccess *cur;
- /* looks like bb_simplify_path... */
- tp = p = p0;
- do {
- if (*p == '/') {
- if (*tp == '/') { /* skip duplicate (or initial) slash */
- continue;
- }
- if (*tp == '.') {
- if (tp[1] == '/' || tp[1] == '\0') { /* remove extra '.' */
- continue;
- }
- if ((tp[1] == '.') && (tp[2] == '/' || tp[2] == '\0')) {
- ++tp;
- if (p > p0) {
- while (*--p != '/') /* omit previous dir */
- continue;
- }
- continue;
- }
- }
- }
- *++p = *tp;
- } while (*++tp);
-
- if ((p == p0) || (*p != '/')) { /* not a trailing slash */
- ++p; /* so keep last character */
+ cur = xzalloc(sizeof(*cur) /* includes space for NUL */ + strlen_buf);
+ strcpy(cur->before_colon, buf);
+ p = cur->before_colon + (after_colon - buf);
+ p[-1] = '\0';
+ cur->after_colon = p;
+ if (ch == '.') {
+ /* .mime line: prepend to mime_a list */
+ cur->next = mime_a;
+ mime_a = cur;
}
- *p = ':';
- strcpy(p + 1, after_colon);
- }
+#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
+ else {
+ /* script interpreter line: prepend to script_i list */
+ cur->next = script_i;
+ script_i = cur;
+ }
#endif
- if (*p0 == 'I') {
- index_page = xstrdup(after_colon);
continue;
}
- /* Do not allow jumping around using H in subdir's configs */
- if (flag == FIRST_PARSE && *p0 == 'H') {
- home_httpd = xstrdup(after_colon);
- xchdir(home_httpd);
- continue;
- }
-
- /* storing current config line */
- cur = xzalloc(sizeof(Htaccess) + strlen(p0));
- strcpy(cur->before_colon, p0);
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
- if (*p0 == '/') /* was malloced - see above */
- free(p0);
-#endif
- cur->after_colon = strchr(cur->before_colon, ':');
- *cur->after_colon++ = '\0';
- if (cur->before_colon[0] == '.') {
- /* .mime line: prepend to mime_a list */
- cur->next = mime_a;
- mime_a = cur;
- continue;
- }
-#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
- if (cur->before_colon[0] == '*' && cur->before_colon[1] == '.') {
- /* script interpreter line: prepend to script_i list */
- cur->next = script_i;
- script_i = cur;
- continue;
- }
-#endif
-#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
-//TODO: we do not test for leading "/"??
-//also, do we leak cur if BASIC_AUTH is off?
- if (prev == NULL) {
- /* first line */
- g_auth = prev = cur;
- } else {
- /* sort path, if current length eq or bigger then move up */
- Htaccess *prev_hti = g_auth;
- size_t l = strlen(cur->before_colon);
- Htaccess *hti;
+ if (ch == '/') { /* "/file:user:pass" */
+ char *p;
+ Htaccess *cur;
+ unsigned file_len;
- for (hti = prev_hti; hti; hti = hti->next) {
- if (l >= strlen(hti->before_colon)) {
- /* insert before hti */
- cur->next = hti;
- if (prev_hti != hti) {
- prev_hti->next = cur;
- } else {
- /* insert as top */
- g_auth = cur;
+ /* note: path is "" unless we are in SUBDIR parse,
+ * otherwise it always starts with "/" */
+ cur = xzalloc(sizeof(*cur) /* includes space for NUL */
+ + strlen(path)
+ + strlen_buf
+ );
+ /* form "/path/file" */
+ sprintf(cur->before_colon, "%s%.*s",
+ path,
+ after_colon - buf - 1, /* includes "/", but not ":" */
+ buf);
+ /* canonicalize it */
+ p = bb_simplify_abs_path_inplace(cur->before_colon);
+ file_len = p - cur->before_colon;
+ /* add "user:pass" after NUL */
+ strcpy(++p, after_colon);
+ cur->after_colon = p;
+
+ /* insert cur into g_auth */
+ /* g_auth is sorted by decreased filename length */
+ {
+ Htaccess *auth, **authp;
+
+ authp = &g_auth;
+ while ((auth = *authp) != NULL) {
+ if (file_len >= strlen(auth->before_colon)) {
+ /* insert cur before auth */
+ cur->next = auth;
+ break;
}
- break;
+ authp = &auth->next;
}
- if (prev_hti != hti)
- prev_hti = prev_hti->next;
+ *authp = cur;
}
- if (!hti) { /* not inserted, add to bottom */
- prev->next = cur;
- prev = cur;
- }
+ continue;
}
#endif /* BASIC_AUTH */
+
+ /* the line is not recognized */
+ config_error:
+ bb_error_msg("config error '%s' in '%s'", buf, filename);
} /* while (fgets) */
+
fclose(f);
}
@@ -2031,8 +2029,8 @@
/* We are done reading headers, disable peer timeout */
alarm(0);
- if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || !ip_allowed) {
- /* protect listing [/path]/httpd_conf or IP deny */
+ if (strcmp(bb_basename(urlcopy), HTTPD_CONF) == 0 || !ip_allowed) {
+ /* protect listing [/path]/httpd.conf or IP deny */
send_headers_and_exit(HTTP_FORBIDDEN);
}
@@ -2245,7 +2243,7 @@
static void sighup_handler(int sig UNUSED_PARAM)
{
- parse_conf(default_path_httpd_conf, SIGNALED_PARSE);
+ parse_conf(DEFAULT_PATH_HTTPD_CONF, SIGNALED_PARSE);
}
enum {
@@ -2304,7 +2302,7 @@
IF_FEATURE_HTTPD_AUTH_MD5("m:")
IF_FEATURE_HTTPD_SETUID("u:")
"p:ifv",
- &configFile, &url_for_decode, &home_httpd
+ &opt_c_configFile, &url_for_decode, &home_httpd
IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
IF_FEATURE_HTTPD_AUTH_MD5(, &pass)
@@ -2375,7 +2373,7 @@
}
#endif
- parse_conf(default_path_httpd_conf, FIRST_PARSE);
+ parse_conf(DEFAULT_PATH_HTTPD_CONF, FIRST_PARSE);
if (!(opt & OPT_INETD))
signal(SIGHUP, sighup_handler);
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