From: Pierre-Marc Fournier <pierre-marc.fournier@polymtl.ca>
Date: Tue, 24 Feb 2009 22:34:22 +0000 (-0500)
Subject: ust: improve message parsing
X-Git-Tag: v0.1~270
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=b02e31e53039229b50d2f54ee31d68709aba1412;p=ust.git

ust: improve message parsing
---

diff --git a/libtracectl/tracectl.c b/libtracectl/tracectl.c
index d041e6b..e926c9e 100644
--- a/libtracectl/tracectl.c
+++ b/libtracectl/tracectl.c
@@ -12,7 +12,7 @@
 #include "localerr.h"
 #include "ustcomm.h"
 
-#define USE_CLONE
+//#define USE_CLONE
 
 #define UNIX_PATH_MAX 108
 
@@ -244,8 +244,9 @@ int listener_main(void *p)
 		char trace_type[] = "ustrelay";
 		char *recvbuf;
 		int len;
+		struct ustcomm_source src;
 
-		result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf);
+		result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src);
 		DBG("HERE");
 		if(result) {
 			WARN("error in ustcomm_app_recv_message");
@@ -313,7 +314,7 @@ int listener_main(void *p)
 				return;
 			}
 		}
-		else if(!strncmp(recvbuf, "get_shmid ", 10)) {
+		else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) {
 			struct ltt_trace_struct *trace;
 			char trace_name[] = "auto";
 			int i;
@@ -337,6 +338,13 @@ int listener_main(void *p)
 
 			}
 		}
+		else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) {
+			char *libfile;
+
+			libfile = nth_token(recvbuf, 1);
+
+			DBG("load_probe_lib loading %s", libfile);
+		}
 
 		free(recvbuf);
 	}
diff --git a/libustcomm/ustcomm.c b/libustcomm/ustcomm.c
index d9c7956..c944214 100644
--- a/libustcomm/ustcomm.c
+++ b/libustcomm/ustcomm.c
@@ -130,12 +130,26 @@ int ustcomm_request_consumer(pid_t pid, const char *channel)
 	return 0;
 }
 
-static int recv_message_fd(int fd, char **msg)
+static int recv_message_fd(int fd, char **msg, struct ustcomm_source *src)
 {
 	int result;
+	size_t initial_addrlen,addrlen;
 
 	*msg = (char *) malloc(MSG_MAX+1);
-	result = recvfrom(fd, *msg, MSG_MAX, 0, NULL, NULL);
+
+	if(src) {
+		initial_addrlen = addrlen = sizeof(src->addr);
+
+		result = recvfrom(fd, *msg, MSG_MAX, 0, &src->addr, &addrlen);
+		if(initial_addrlen != addrlen) {
+			ERR("recvfrom: unexpected address length");
+			return -1;
+		}
+	}
+	else {
+		result = recvfrom(fd, *msg, MSG_MAX, 0, NULL, NULL);
+	}
+
 	if(result == -1) {
 		PERROR("recvfrom");
 		return -1;
@@ -148,14 +162,14 @@ static int recv_message_fd(int fd, char **msg)
 	return 0;
 }
 
-int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg)
+int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg, struct ustcomm_source *src)
 {
-	return recv_message_fd(ustd->fd, msg);
+	return recv_message_fd(ustd->fd, msg, src);
 }
 
-int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg)
+int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg, struct ustcomm_source *src)
 {
-	return recv_message_fd(app->fd, msg);
+	return recv_message_fd(app->fd, msg, src);
 }
 
 static int init_named_socket(char *name, char **path_out)
@@ -237,3 +251,88 @@ int ustcomm_init_ustd(struct ustcomm_ustd *handle)
 
 	return 0;
 }
+
+char *find_tok(const char *str)
+{
+	while(*str == ' ') {
+		str++;
+
+		if(*str == 0)
+			return NULL;
+	}
+
+	return str;
+}
+
+static char *find_sep(char *str)
+{
+	while(*str != ' ') {
+		str++;
+
+		if(*str == 0)
+			break;
+	}
+
+	return str;
+}
+
+int nth_token_is(char *str, char *token, int tok_no)
+{
+	int i;
+	char *start;
+	char *end;
+
+	for(i=0; i<=tok_no; i++) {
+		str = find_tok(str);
+		if(str == NULL)
+			return -1;
+
+		start = str;
+
+		str = find_sep(str);
+		if(str == NULL)
+			return -1;
+
+		end = str;
+	}
+
+	if(end-start != strlen(token))
+		return 0;
+
+	if(strncmp(start, token, end-start))
+		return 0;
+
+	return 1;
+}
+
+char *nth_token(char *str, int tok_no)
+{
+	static char *retval = NULL;
+	int i;
+	char *start;
+	char *end;
+
+	for(i=0; i<=tok_no; i++) {
+		str = find_tok(str);
+		if(str == NULL)
+			return NULL;
+
+		start = str;
+
+		str = find_sep(str);
+		if(str == NULL)
+			return NULL;
+
+		end = str;
+	}
+
+	if(retval) {
+		free(retval);
+		retval = NULL;
+	}
+
+	retval = strndupa(start, end-start);
+
+	return retval;
+}
+
diff --git a/libustcomm/ustcomm.h b/libustcomm/ustcomm.h
index 08d7480..53ced51 100644
--- a/libustcomm/ustcomm.h
+++ b/libustcomm/ustcomm.h
@@ -2,6 +2,7 @@
 #define USTCOMM_H
 
 #include <sys/types.h>
+#include <sys/un.h>
 
 struct ustcomm_app {
 	/* the "server" socket for serving the external requests */
@@ -15,13 +16,21 @@ struct ustcomm_ustd {
 	char *socketpath;
 };
 
+struct ustcomm_source {
+	struct sockaddr_un addr;
+};
+
 int send_message(pid_t pid, const char *msg, char **reply);
 
-int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg);
-int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg);
+int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg, struct ustcomm_source *src);
+int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg, struct ustcomm_source *src);
 
 int ustcomm_init_app(pid_t pid, struct ustcomm_app *handle);
 
 int ustcomm_init_ustd(struct ustcomm_ustd *handle);
 
+int nth_token_is(char *str, char *token, int tok_no);
+
+char *nth_token(char *str, int tok_no);
+
 #endif /* USTCOMM_H */