diff mbox series

[v11,05/10] migration: convert exec backend to accept MigrateAddress.

Message ID 20231004075851.219173-6-het.gala@nutanix.com (mailing list archive)
State New, archived
Headers show
Series migration: Modify 'migrate' and 'migrate-incoming' QAPI commands for migration | expand

Commit Message

Het Gala Oct. 4, 2023, 7:58 a.m. UTC 
Exec transport backend for 'migrate'/'migrate-incoming' QAPIs accept
new wire protocol of MigrateAddress struct.

It is achived by parsing 'uri' string and storing migration parameters
required for exec connection into strList struct.

Suggested-by: Aravind Retnakaran <aravind.retnakaran@nutanix.com>
Signed-off-by: Het Gala <het.gala@nutanix.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
---
 migration/exec.c      | 71 +++++++++++++++++++++++++++++++------------
 migration/exec.h      |  4 +--
 migration/migration.c | 10 +++---
 3 files changed, 57 insertions(+), 28 deletions(-)

Comments

Fabiano Rosas Oct. 4, 2023, 2:55 p.m. UTC | #1 
Het Gala <het.gala@nutanix.com> writes:

> Exec transport backend for 'migrate'/'migrate-incoming' QAPIs accept
> new wire protocol of MigrateAddress struct.
>
> It is achived by parsing 'uri' string and storing migration parameters
> required for exec connection into strList struct.
>
> Suggested-by: Aravind Retnakaran <aravind.retnakaran@nutanix.com>
> Signed-off-by: Het Gala <het.gala@nutanix.com>
> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
>  migration/exec.c      | 71 +++++++++++++++++++++++++++++++------------
>  migration/exec.h      |  4 +--
>  migration/migration.c | 10 +++---
>  3 files changed, 57 insertions(+), 28 deletions(-)
>
> diff --git a/migration/exec.c b/migration/exec.c
> index 32f5143dfd..8bc321c66b 100644
> --- a/migration/exec.c
> +++ b/migration/exec.c
> @@ -39,20 +39,50 @@ const char *exec_get_cmd_path(void)
>  }
>  #endif
>  
> -void exec_start_outgoing_migration(MigrationState *s, const char *command, Error **errp)
> +/* provides the length of strList */
> +static int
> +str_list_length(strList *list)
> +{
> +    int len = 0;
> +    strList *elem;
> +
> +    for (elem = list; elem != NULL; elem = elem->next) {
> +        len++;
> +    }
> +
> +    return len;
> +}
> +
> +static void
> +init_exec_array(strList *command, char **argv, Error **errp)
> +{
> +    int i = 0;
> +    strList *lst;
> +
> +    for (lst = command; lst; lst = lst->next) {
> +        argv[i++] = lst->value;
> +    }
> +
> +    argv[i] = NULL;

This will write out of bounds. 

> +    return;
> +}
> +
> +void exec_start_outgoing_migration(MigrationState *s, strList *command,
> +                                   Error **errp)
>  {
>      QIOChannel *ioc;
>  
> -#ifdef WIN32
> -    const char *argv[] = { exec_get_cmd_path(), "/c", command, NULL };
> -#else
> -    const char *argv[] = { "/bin/sh", "-c", command, NULL };
> -#endif
> +    int length = str_list_length(command);
> +    g_auto(GStrv) argv = (char **) g_new0(const char *, length);

This allocation does not leave space for the NULL byte.

>  
> -    trace_migration_exec_outgoing(command);
> -    ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
> -                                                    O_RDWR,
> -                                                    errp));
> +    init_exec_array(command, argv, errp);
> +    g_autofree char *new_command = g_strjoinv(" ", (char **)argv);
> +
> +    trace_migration_exec_outgoing(new_command);
> +    ioc = QIO_CHANNEL(
> +        qio_channel_command_new_spawn((const char * const *) argv,
> +                                      O_RDWR,
> +                                      errp));
>      if (!ioc) {
>          return;
>      }
> @@ -71,20 +101,21 @@ static gboolean exec_accept_incoming_migration(QIOChannel *ioc,
>      return G_SOURCE_REMOVE;
>  }
>  
> -void exec_start_incoming_migration(const char *command, Error **errp)
> +void exec_start_incoming_migration(strList *command, Error **errp)
>  {
>      QIOChannel *ioc;
>  
> -#ifdef WIN32
> -    const char *argv[] = { exec_get_cmd_path(), "/c", command, NULL };
> -#else
> -    const char *argv[] = { "/bin/sh", "-c", command, NULL };
> -#endif
> +    int length = str_list_length(command);
> +    g_auto(GStrv) argv = (char **) g_new0(const char *, length);

Here as well.

> +
> +    init_exec_array(command, argv, errp);
> +    g_autofree char *new_command = g_strjoinv(" ", (char **)argv);
>  
> -    trace_migration_exec_incoming(command);
> -    ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
> -                                                    O_RDWR,
> -                                                    errp));
> +    trace_migration_exec_incoming(new_command);
> +    ioc = QIO_CHANNEL(
> +        qio_channel_command_new_spawn((const char * const *) argv,
> +                                      O_RDWR,
> +                                      errp));
>      if (!ioc) {
>          return;
>      }
> diff --git a/migration/exec.h b/migration/exec.h
> index 736cd71028..3107f205e3 100644
> --- a/migration/exec.h
> +++ b/migration/exec.h
> @@ -23,8 +23,8 @@
>  #ifdef WIN32
>  const char *exec_get_cmd_path(void);
>  #endif
> -void exec_start_incoming_migration(const char *host_port, Error **errp);
> +void exec_start_incoming_migration(strList *host_port, Error **errp);
>  
> -void exec_start_outgoing_migration(MigrationState *s, const char *host_port,
> +void exec_start_outgoing_migration(MigrationState *s, strList *host_port,
>                                     Error **errp);
>  #endif
> diff --git a/migration/migration.c b/migration/migration.c
> index b41fda6f80..ebe14b9c38 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -474,7 +474,6 @@ static bool migrate_uri_parse(const char *uri,
>  
>  static void qemu_start_incoming_migration(const char *uri, Error **errp)
>  {
> -    const char *p = NULL;
>      g_autoptr(MigrationAddress) channel = g_new0(MigrationAddress, 1);
>  
>      /* URI is not suitable for migration? */
> @@ -500,8 +499,8 @@ static void qemu_start_incoming_migration(const char *uri, Error **errp)
>      } else if (channel->transport == MIGRATION_ADDRESS_TYPE_RDMA) {
>          rdma_start_incoming_migration(&channel->u.rdma, errp);
>  #endif
> -    } else if (strstart(uri, "exec:", &p)) {
> -        exec_start_incoming_migration(p, errp);
> +    } else if (channel->transport == MIGRATION_ADDRESS_TYPE_EXEC) {
> +        exec_start_incoming_migration(channel->u.exec.args, errp);
>      } else {
>          error_setg(errp, "unknown migration protocol: %s", uri);
>      }
> @@ -1723,7 +1722,6 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
>      bool resume_requested;
>      Error *local_err = NULL;
>      MigrationState *s = migrate_get_current();
> -    const char *p = NULL;
>      g_autoptr(MigrationAddress) channel = g_new0(MigrationAddress, 1);
>  
>      /* URI is not suitable for migration? */
> @@ -1761,8 +1759,8 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
>      } else if (channel->transport == MIGRATION_ADDRESS_TYPE_RDMA) {
>          rdma_start_outgoing_migration(s, &channel->u.rdma, &local_err);
>  #endif
> -    } else if (strstart(uri, "exec:", &p)) {
> -        exec_start_outgoing_migration(s, p, &local_err);
> +    } else if (channel->transport == MIGRATION_ADDRESS_TYPE_EXEC) {
> +        exec_start_outgoing_migration(s, channel->u.exec.args, &local_err);
>      } else {
>          error_setg(&local_err, QERR_INVALID_PARAMETER_VALUE, "uri",
>                     "a valid migration protocol");
Het Gala Oct. 7, 2023, 12:36 p.m. UTC | #2 
On 10/4/2023 8:25 PM, Fabiano Rosas wrote:
> Het Gala<het.gala@nutanix.com>  writes:
>
>> Exec transport backend for 'migrate'/'migrate-incoming' QAPIs accept
>> new wire protocol of MigrateAddress struct.
>>
>> It is achived by parsing 'uri' string and storing migration parameters
>> required for exec connection into strList struct.
>>
>> Suggested-by: Aravind Retnakaran<aravind.retnakaran@nutanix.com>
>> Signed-off-by: Het Gala<het.gala@nutanix.com>
>> Reviewed-by: Daniel P. Berrangé<berrange@redhat.com>
>> ---
>>   migration/exec.c      | 71 +++++++++++++++++++++++++++++++------------
>>   migration/exec.h      |  4 +--
>>   migration/migration.c | 10 +++---
>>   3 files changed, 57 insertions(+), 28 deletions(-)
>>
>> -void exec_start_outgoing_migration(MigrationState *s, const char *command, Error **errp)
>> +/* provides the length of strList */
>> +static int
>> +str_list_length(strList *list)
>> +{
>> +    int len = 0;
>> +    strList *elem;
>> +
>> +    for (elem = list; elem != NULL; elem = elem->next) {
>> +        len++;
>> +    }
>> +
>> +    return len;
>> +}
>> +
>> +static void
>> +init_exec_array(strList *command, char **argv, Error **errp)
>> +{
>> +    int i = 0;
>> +    strList *lst;
>> +
>> +    for (lst = command; lst; lst = lst->next) {
>> +        argv[i++] = lst->value;
>> +    }
>> +
>> +    argv[i] = NULL;
> This will write out of bounds.
Yes, will increase the length of argv in exec_start_outgoing_migration() 
by one, that would solve the issue right.
>> +    return;
>> +}
>> +
>> +void exec_start_outgoing_migration(MigrationState *s, strList *command,
>> +                                   Error **errp)
>>   {
>>       QIOChannel *ioc;
>>   
>> -#ifdef WIN32
>> -    const char *argv[] = { exec_get_cmd_path(), "/c", command, NULL };
>> -#else
>> -    const char *argv[] = { "/bin/sh", "-c", command, NULL };
>> -#endif
>> +    int length = str_list_length(command);
>> +    g_auto(GStrv) argv = (char **) g_new0(const char *, length);
> This allocation does not leave space for the NULL byte.

Yes you are rigght. I assumed the user will itself have to end the list 
of argument with a 'NULL', but that's not correct. Thanks for pointing 
it out. Will make the length of argv from length -> length+1.

>>   
>> -    trace_migration_exec_outgoing(command);
>> -    ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
>> -                                                    O_RDWR,
>> -                                                    errp));
>> +    init_exec_array(command, argv, errp);
>> +    g_autofree char *new_command = g_strjoinv(" ", (char **)argv);
>> +
>> +    trace_migration_exec_outgoing(new_command);
>> +    ioc = QIO_CHANNEL(
>> +        qio_channel_command_new_spawn((const char * const *) argv,
>> +                                      O_RDWR,
>> +                                      errp));
>>       if (!ioc) {
>>           return;
>>       }
>> @@ -71,20 +101,21 @@ static gboolean exec_accept_incoming_migration(QIOChannel *ioc,
>>       return G_SOURCE_REMOVE;
>>   }
>>   
>> -void exec_start_incoming_migration(const char *command, Error **errp)
>> +void exec_start_incoming_migration(strList *command, Error **errp)
>>   {
>>       QIOChannel *ioc;
>>   
>> -#ifdef WIN32
>> -    const char *argv[] = { exec_get_cmd_path(), "/c", command, NULL };
>> -#else
>> -    const char *argv[] = { "/bin/sh", "-c", command, NULL };
>> -#endif
>> +    int length = str_list_length(command);
>> +    g_auto(GStrv) argv = (char **) g_new0(const char *, length);
> Here as well.
Ack, will increase length of argv by one while initalization.
Regards,
Het Gala
diff mbox series

Patch

diff --git a/migration/exec.c b/migration/exec.c
index 32f5143dfd..8bc321c66b 100644
--- a/migration/exec.c
+++ b/migration/exec.c
@@ -39,20 +39,50 @@  const char *exec_get_cmd_path(void)
 }
 #endif
 
-void exec_start_outgoing_migration(MigrationState *s, const char *command, Error **errp)
+/* provides the length of strList */
+static int
+str_list_length(strList *list)
+{
+    int len = 0;
+    strList *elem;
+
+    for (elem = list; elem != NULL; elem = elem->next) {
+        len++;
+    }
+
+    return len;
+}
+
+static void
+init_exec_array(strList *command, char **argv, Error **errp)
+{
+    int i = 0;
+    strList *lst;
+
+    for (lst = command; lst; lst = lst->next) {
+        argv[i++] = lst->value;
+    }
+
+    argv[i] = NULL;
+    return;
+}
+
+void exec_start_outgoing_migration(MigrationState *s, strList *command,
+                                   Error **errp)
 {
     QIOChannel *ioc;
 
-#ifdef WIN32
-    const char *argv[] = { exec_get_cmd_path(), "/c", command, NULL };
-#else
-    const char *argv[] = { "/bin/sh", "-c", command, NULL };
-#endif
+    int length = str_list_length(command);
+    g_auto(GStrv) argv = (char **) g_new0(const char *, length);
 
-    trace_migration_exec_outgoing(command);
-    ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
-                                                    O_RDWR,
-                                                    errp));
+    init_exec_array(command, argv, errp);
+    g_autofree char *new_command = g_strjoinv(" ", (char **)argv);
+
+    trace_migration_exec_outgoing(new_command);
+    ioc = QIO_CHANNEL(
+        qio_channel_command_new_spawn((const char * const *) argv,
+                                      O_RDWR,
+                                      errp));
     if (!ioc) {
         return;
     }
@@ -71,20 +101,21 @@  static gboolean exec_accept_incoming_migration(QIOChannel *ioc,
     return G_SOURCE_REMOVE;
 }
 
-void exec_start_incoming_migration(const char *command, Error **errp)
+void exec_start_incoming_migration(strList *command, Error **errp)
 {
     QIOChannel *ioc;
 
-#ifdef WIN32
-    const char *argv[] = { exec_get_cmd_path(), "/c", command, NULL };
-#else
-    const char *argv[] = { "/bin/sh", "-c", command, NULL };
-#endif
+    int length = str_list_length(command);
+    g_auto(GStrv) argv = (char **) g_new0(const char *, length);
+
+    init_exec_array(command, argv, errp);
+    g_autofree char *new_command = g_strjoinv(" ", (char **)argv);
 
-    trace_migration_exec_incoming(command);
-    ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
-                                                    O_RDWR,
-                                                    errp));
+    trace_migration_exec_incoming(new_command);
+    ioc = QIO_CHANNEL(
+        qio_channel_command_new_spawn((const char * const *) argv,
+                                      O_RDWR,
+                                      errp));
     if (!ioc) {
         return;
     }
diff --git a/migration/exec.h b/migration/exec.h
index 736cd71028..3107f205e3 100644
--- a/migration/exec.h
+++ b/migration/exec.h
@@ -23,8 +23,8 @@ 
 #ifdef WIN32
 const char *exec_get_cmd_path(void);
 #endif
-void exec_start_incoming_migration(const char *host_port, Error **errp);
+void exec_start_incoming_migration(strList *host_port, Error **errp);
 
-void exec_start_outgoing_migration(MigrationState *s, const char *host_port,
+void exec_start_outgoing_migration(MigrationState *s, strList *host_port,
                                    Error **errp);
 #endif
diff --git a/migration/migration.c b/migration/migration.c
index b41fda6f80..ebe14b9c38 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -474,7 +474,6 @@  static bool migrate_uri_parse(const char *uri,
 
 static void qemu_start_incoming_migration(const char *uri, Error **errp)
 {
-    const char *p = NULL;
     g_autoptr(MigrationAddress) channel = g_new0(MigrationAddress, 1);
 
     /* URI is not suitable for migration? */
@@ -500,8 +499,8 @@  static void qemu_start_incoming_migration(const char *uri, Error **errp)
     } else if (channel->transport == MIGRATION_ADDRESS_TYPE_RDMA) {
         rdma_start_incoming_migration(&channel->u.rdma, errp);
 #endif
-    } else if (strstart(uri, "exec:", &p)) {
-        exec_start_incoming_migration(p, errp);
+    } else if (channel->transport == MIGRATION_ADDRESS_TYPE_EXEC) {
+        exec_start_incoming_migration(channel->u.exec.args, errp);
     } else {
         error_setg(errp, "unknown migration protocol: %s", uri);
     }
@@ -1723,7 +1722,6 @@  void qmp_migrate(const char *uri, bool has_blk, bool blk,
     bool resume_requested;
     Error *local_err = NULL;
     MigrationState *s = migrate_get_current();
-    const char *p = NULL;
     g_autoptr(MigrationAddress) channel = g_new0(MigrationAddress, 1);
 
     /* URI is not suitable for migration? */
@@ -1761,8 +1759,8 @@  void qmp_migrate(const char *uri, bool has_blk, bool blk,
     } else if (channel->transport == MIGRATION_ADDRESS_TYPE_RDMA) {
         rdma_start_outgoing_migration(s, &channel->u.rdma, &local_err);
 #endif
-    } else if (strstart(uri, "exec:", &p)) {
-        exec_start_outgoing_migration(s, p, &local_err);
+    } else if (channel->transport == MIGRATION_ADDRESS_TYPE_EXEC) {
+        exec_start_outgoing_migration(s, channel->u.exec.args, &local_err);
     } else {
         error_setg(&local_err, QERR_INVALID_PARAMETER_VALUE, "uri",
                    "a valid migration protocol");