Adding upstream version 3.5.24.upstream/3.5.24

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 384 insertions, 0 deletions

diff --git a/src/util/dict_sockmap.c b/src/util/dict_sockmap.c
new file mode 100644
index 0000000..becad1a
--- /dev/null
+++ b/src/util/dict_sockmap.c
@@ -0,0 +1,384 @@
+/*++
+/* NAME
+/*	dict_sockmap 3
+/* SUMMARY
+/*	dictionary manager interface to Sendmail-style socketmap server
+/* SYNOPSIS
+/*	#include <dict_sockmap.h>
+/*
+/*	DICT	*dict_sockmap_open(map, open_flags, dict_flags)
+/*	const char *map;
+/*	int	open_flags;
+/*	int	dict_flags;
+/* DESCRIPTION
+/*	dict_sockmap_open() makes a Sendmail-style socketmap server
+/*	accessible via the generic dictionary operations described
+/*	in dict_open(3).  The only implemented operation is dictionary
+/*	lookup. This map type can be useful for simulating a dynamic
+/*	lookup table.
+/*
+/*	Postfix socketmap names have the form inet:host:port:socketmap-name
+/*	or unix:pathname:socketmap-name, where socketmap-name
+/*	specifies the socketmap name that the socketmap server uses.
+/*
+/*	To test this module, build the netstring and dict_open test
+/*	programs. Run "./netstring nc -l portnumber" as the server,
+/*	and "./dict_open socketmap:127.0.0.1:portnumber:socketmapname"
+/*	as the client.
+/* PROTOCOL
+/* .ad
+/* .fi
+/*	The socketmap class implements a simple protocol: the client
+/*	sends one request, and the server sends one reply.
+/* ENCODING
+/* .ad
+/* .fi
+/*	Each request and reply are sent as one netstring object.
+/* REQUEST FORMAT
+/* .ad
+/* .fi
+/* .IP "<mapname> <space> <key>"
+/*	Search the specified socketmap under the specified key.
+/* REPLY FORMAT
+/* .ad
+/* .fi
+/*	Replies must be no longer than 100000 characters (not including
+/*	the netstring encapsulation), and must have the following
+/*	form:
+/* .IP "OK <space> <data>"
+/*	The requested data was found.
+/* .IP "NOTFOUND <space>"
+/*	The requested data was not found.
+/* .IP "TEMP <space> <reason>"
+/* .IP "TIMEOUT <space> <reason>"
+/* .IP "PERM <space> <reason>"
+/*	The request failed. The reason, if non-empty, is descriptive
+/*	text.
+/* SECURITY
+/*	This map cannot be used for security-sensitive information,
+/*	because neither the connection nor the server are authenticated.
+/* SEE ALSO
+/*	dict(3) generic dictionary manager
+/*	netstring(3) netstring stream I/O support
+/* DIAGNOSTICS
+/*	Fatal errors: out of memory, unknown host or service name,
+/*	attempt to update or iterate over map.
+/* BUGS
+/*	The protocol limits are not yet configurable.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+ /*
+  * System library.
+  */
+#include <sys_defs.h>
+#include <errno.h>
+#include <string.h>
+#include <ctype.h>
+
+ /*
+  * Utility library.
+  */
+#include <mymalloc.h>
+#include <msg.h>
+#include <vstream.h>
+#include <auto_clnt.h>
+#include <netstring.h>
+#include <split_at.h>
+#include <stringops.h>
+#include <htable.h>
+#include <dict_sockmap.h>
+
+ /*
+  * Socket map data structure.
+  */
+typedef struct {
+    DICT    dict;			/* parent class */
+    char   *sockmap_name;		/* on-the-wire socketmap name */
+    VSTRING *rdwr_buf;			/* read/write buffer */
+    HTABLE_INFO *client_info;		/* shared endpoint name and handle */
+} DICT_SOCKMAP;
+
+ /*
+  * Default limits.
+  */
+#define DICT_SOCKMAP_DEF_TIMEOUT	100	/* connect/read/write timeout */
+#define DICT_SOCKMAP_DEF_MAX_REPLY	100000	/* reply size limit */
+#define DICT_SOCKMAP_DEF_MAX_IDLE	10	/* close idle socket */
+#define DICT_SOCKMAP_DEF_MAX_TTL	100	/* close old socket */
+
+ /*
+  * Class variables.
+  */
+static int dict_sockmap_timeout = DICT_SOCKMAP_DEF_TIMEOUT;
+static int dict_sockmap_max_reply = DICT_SOCKMAP_DEF_MAX_REPLY;
+static int dict_sockmap_max_idle = DICT_SOCKMAP_DEF_MAX_IDLE;
+static int dict_sockmap_max_ttl = DICT_SOCKMAP_DEF_MAX_TTL;
+
+ /*
+  * The client handle is shared between socketmap instances that have the
+  * same inet:host:port or unix:pathame information. This could be factored
+  * out as a general module for reference-counted handles of any kind.
+  */
+static HTABLE *dict_sockmap_handles;	/* shared handles */
+
+typedef struct {
+    AUTO_CLNT *client_handle;		/* the client handle */
+    int     refcount;			/* the reference count */
+} DICT_SOCKMAP_REFC_HANDLE;
+
+#define DICT_SOCKMAP_RH_NAME(ht)	(ht)->key
+#define DICT_SOCKMAP_RH_HANDLE(ht) \
+	((DICT_SOCKMAP_REFC_HANDLE *) (ht)->value)->client_handle
+#define DICT_SOCKMAP_RH_REFCOUNT(ht) \
+	((DICT_SOCKMAP_REFC_HANDLE *) (ht)->value)->refcount
+
+ /*
+  * Socketmap protocol elements.
+  */
+#define DICT_SOCKMAP_PROT_OK		"OK"
+#define DICT_SOCKMAP_PROT_NOTFOUND	"NOTFOUND"
+#define DICT_SOCKMAP_PROT_TEMP		"TEMP"
+#define DICT_SOCKMAP_PROT_TIMEOUT	"TIMEOUT"
+#define DICT_SOCKMAP_PROT_PERM		"PERM"
+
+ /*
+  * SLMs.
+  */
+#define STR(x)	vstring_str(x)
+#define LEN(x)	VSTRING_LEN(x)
+
+/* dict_sockmap_lookup - socket map lookup */
+
+static const char *dict_sockmap_lookup(DICT *dict, const char *key)
+{
+    const char *myname = "dict_sockmap_lookup";
+    DICT_SOCKMAP *dp = (DICT_SOCKMAP *) dict;
+    AUTO_CLNT *sockmap_clnt = DICT_SOCKMAP_RH_HANDLE(dp->client_info);
+    VSTREAM *fp;
+    int     netstring_err;
+    char   *reply_payload;
+    int     except_count;
+    const char *error_class;
+
+    if (msg_verbose)
+	msg_info("%s: key %s", myname, key);
+
+    /*
+     * Optionally fold the key.
+     */
+    if (dict->flags & DICT_FLAG_FOLD_MUL) {
+	if (dict->fold_buf == 0)
+	    dict->fold_buf = vstring_alloc(100);
+	vstring_strcpy(dict->fold_buf, key);
+	key = lowercase(STR(dict->fold_buf));
+    }
+
+    /*
+     * We retry connection-level errors once, to make server restarts
+     * transparent.
+     */
+    for (except_count = 0; /* see below */ ; except_count++) {
+
+	/*
+	 * Look up the stream.
+	 */
+	if ((fp = auto_clnt_access(sockmap_clnt)) == 0) {
+	    msg_warn("table %s:%s lookup error: %m", dict->type, dict->name);
+	    dict->error = DICT_ERR_RETRY;
+	    return (0);
+	}
+
+	/*
+	 * Set up an exception handler.
+	 */
+	netstring_setup(fp, dict_sockmap_timeout);
+	if ((netstring_err = vstream_setjmp(fp)) == 0) {
+
+	    /*
+	     * Send the query. This may raise an exception.
+	     */
+	    vstring_sprintf(dp->rdwr_buf, "%s %s", dp->sockmap_name, key);
+	    NETSTRING_PUT_BUF(fp, dp->rdwr_buf);
+
+	    /*
+	     * Receive the response. This may raise an exception.
+	     */
+	    netstring_get(fp, dp->rdwr_buf, dict_sockmap_max_reply);
+
+	    /*
+	     * If we got here, then no exception was raised.
+	     */
+	    break;
+	}
+
+	/*
+	 * Handle exceptions.
+	 */
+	else {
+
+	    /*
+	     * We retry a broken connection only once.
+	     */
+	    if (except_count == 0 && netstring_err == NETSTRING_ERR_EOF
+		&& errno != ETIMEDOUT) {
+		auto_clnt_recover(sockmap_clnt);
+		continue;
+	    }
+
+	    /*
+	     * We do not retry other errors.
+	     */
+	    else {
+		msg_warn("table %s:%s lookup error: %s",
+			 dict->type, dict->name,
+			 netstring_strerror(netstring_err));
+		dict->error = DICT_ERR_RETRY;
+		return (0);
+	    }
+	}
+    }
+
+    /*
+     * Parse the reply.
+     */
+    VSTRING_TERMINATE(dp->rdwr_buf);
+    reply_payload = split_at(STR(dp->rdwr_buf), ' ');
+    if (strcmp(STR(dp->rdwr_buf), DICT_SOCKMAP_PROT_OK) == 0) {
+	dict->error = 0;
+	return (reply_payload);
+    } else if (strcmp(STR(dp->rdwr_buf), DICT_SOCKMAP_PROT_NOTFOUND) == 0) {
+	dict->error = 0;
+	return (0);
+    }
+    /* We got no definitive reply. */
+    if (strcmp(STR(dp->rdwr_buf), DICT_SOCKMAP_PROT_TEMP) == 0) {
+	error_class = "temporary";
+	dict->error = DICT_ERR_RETRY;
+    } else if (strcmp(STR(dp->rdwr_buf), DICT_SOCKMAP_PROT_TIMEOUT) == 0) {
+	error_class = "timeout";
+	dict->error = DICT_ERR_RETRY;
+    } else if (strcmp(STR(dp->rdwr_buf), DICT_SOCKMAP_PROT_PERM) == 0) {
+	error_class = "permanent";
+	dict->error = DICT_ERR_CONFIG;
+    } else {
+	error_class = "unknown";
+	dict->error = DICT_ERR_RETRY;
+    }
+    while (reply_payload && ISSPACE(*reply_payload))
+	reply_payload++;
+    msg_warn("%s:%s socketmap server %s error%s%.200s",
+	     dict->type, dict->name, error_class,
+	     reply_payload && *reply_payload ? ": " : "",
+	     reply_payload && *reply_payload ?
+	     printable(reply_payload, '?') : "");
+    return (0);
+}
+
+/* dict_sockmap_close - close socket map */
+
+static void dict_sockmap_close(DICT *dict)
+{
+    const char *myname = "dict_sockmap_close";
+    DICT_SOCKMAP *dp = (DICT_SOCKMAP *) dict;
+
+    if (dict_sockmap_handles == 0 || dict_sockmap_handles->used == 0)
+	msg_panic("%s: attempt to close a non-existent map", myname);
+    vstring_free(dp->rdwr_buf);
+    myfree(dp->sockmap_name);
+    if (--DICT_SOCKMAP_RH_REFCOUNT(dp->client_info) == 0) {
+	auto_clnt_free(DICT_SOCKMAP_RH_HANDLE(dp->client_info));
+	htable_delete(dict_sockmap_handles,
+		      DICT_SOCKMAP_RH_NAME(dp->client_info), myfree);
+    }
+    if (dict->fold_buf)
+	vstring_free(dict->fold_buf);
+    dict_free(dict);
+}
+
+/* dict_sockmap_open - open socket map */
+
+DICT   *dict_sockmap_open(const char *mapname, int open_flags, int dict_flags)
+{
+    DICT_SOCKMAP *dp;
+    char   *saved_name = 0;
+    char   *sockmap;
+    DICT_SOCKMAP_REFC_HANDLE *ref_handle;
+    HTABLE_INFO *client_info;
+
+    /*
+     * Let the optimizer worry about eliminating redundant code.
+     */
+#define DICT_SOCKMAP_OPEN_RETURN(d) do { \
+	DICT *__d = (d); \
+	if (saved_name != 0) \
+	    myfree(saved_name); \
+	return (__d); \
+    } while (0)
+
+    /*
+     * Sanity checks.
+     */
+    if (open_flags != O_RDONLY)
+	DICT_SOCKMAP_OPEN_RETURN(dict_surrogate(DICT_TYPE_SOCKMAP, mapname,
+						open_flags, dict_flags,
+				  "%s:%s map requires O_RDONLY access mode",
+						DICT_TYPE_SOCKMAP, mapname));
+    if (dict_flags & DICT_FLAG_NO_UNAUTH)
+	DICT_SOCKMAP_OPEN_RETURN(dict_surrogate(DICT_TYPE_SOCKMAP, mapname,
+						open_flags, dict_flags,
+		     "%s:%s map is not allowed for security-sensitive data",
+						DICT_TYPE_SOCKMAP, mapname));
+
+    /*
+     * Separate the socketmap name from the socketmap server name.
+     */
+    saved_name = mystrdup(mapname);
+    if ((sockmap = split_at_right(saved_name, ':')) == 0)
+	DICT_SOCKMAP_OPEN_RETURN(dict_surrogate(DICT_TYPE_SOCKMAP, mapname,
+						open_flags, dict_flags,
+				    "%s requires server:socketmap argument",
+						DICT_TYPE_SOCKMAP));
+
+    /*
+     * Use one reference-counted client handle for all socketmaps with the
+     * same inet:host:port or unix:pathname information.
+     * 
+     * XXX Todo: graceful degradation after endpoint syntax error.
+     */
+    if (dict_sockmap_handles == 0)
+	dict_sockmap_handles = htable_create(1);
+    if ((client_info = htable_locate(dict_sockmap_handles, saved_name)) == 0) {
+	ref_handle = (DICT_SOCKMAP_REFC_HANDLE *) mymalloc(sizeof(*ref_handle));
+	client_info = htable_enter(dict_sockmap_handles,
+				   saved_name, (void *) ref_handle);
+	/* XXX Late initialization, so we can reuse macros for consistency. */
+	DICT_SOCKMAP_RH_REFCOUNT(client_info) = 1;
+	DICT_SOCKMAP_RH_HANDLE(client_info) =
+	    auto_clnt_create(saved_name, dict_sockmap_timeout,
+			     dict_sockmap_max_idle, dict_sockmap_max_ttl);
+    } else
+	DICT_SOCKMAP_RH_REFCOUNT(client_info) += 1;
+
+    /*
+     * Instantiate a socket map handle.
+     */
+    dp = (DICT_SOCKMAP *) dict_alloc(DICT_TYPE_SOCKMAP, mapname, sizeof(*dp));
+    dp->rdwr_buf = vstring_alloc(100);
+    dp->sockmap_name = mystrdup(sockmap);
+    dp->client_info = client_info;
+    dp->dict.lookup = dict_sockmap_lookup;
+    dp->dict.close = dict_sockmap_close;
+    /* Don't look up parent domains or network superblocks. */
+    dp->dict.flags = dict_flags | DICT_FLAG_PATTERN;
+
+    DICT_SOCKMAP_OPEN_RETURN(DICT_DEBUG (&dp->dict));
+}