[at][sal] Add query and unregistered protocol family functions

components/net/sal_socket/SConscript

@@ -16,6 +16,9 @@ if GetDepend('SAL_USING_LWIP'):
 
 if GetDepend('SAL_USING_AT'):
     src += Glob('impl/af_inet_at.c')
+    
+if GetDepend('SAL_USING_LWIP') or GetDepend('SAL_USING_AT'):
+    CPPPATH += [cwd + '/impl']
 
 if GetDepend('SAL_USING_POSIX'):
     src += Glob('dfs_net/*.c')

components/net/sal_socket/impl/af_inet.h

@@ -0,0 +1,40 @@
+/*
+ * File      : af_inet.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-08-25     ChenYong     First version
+ */
+
+#ifndef __AF_INET_H__
+#define __AF_INET_H__
+
+#include <rtthread.h>
+
+#ifdef SAL_USING_LWIP
+/* lwIP protocol family register */
+int lwip_inet_init(void);
+#endif
+
+#ifdef SAL_USING_AT
+/* AT protocol family register */
+int at_inet_init(void);
+#endif
+
+#endif /* __AF_INET_H__ */

components/net/sal_socket/impl/af_inet_at.c

@@ -26,6 +26,7 @@
 #include <sal.h>
 
 #include <at_socket.h>
+#include <af_inet.h>
 
 #ifdef SAL_USING_POSIX
 #include <dfs_poll.h>
@@ -107,6 +108,7 @@ static int at_create(struct sal_socket *socket, int type, int protocol)
 }
 
 static const struct proto_family at_inet_family_ops = {
+    "at",
     AF_AT,
     AF_INET,
     at_create,

components/net/sal_socket/impl/af_inet_lwip.c

@@ -34,6 +34,7 @@
 #endif
 
 #include <sal.h>
+#include <af_inet.h>
 
 #if LWIP_VERSION < 0x2000000
 #define SELWAIT_T int
@@ -284,6 +285,7 @@ static int inet_create(struct sal_socket *socket, int type, int protocol)
 }
 
 static const struct proto_family lwip_inet_family_ops = {
+    "lwip",
     AF_INET,
     AF_INET,
     inet_create,

components/net/sal_socket/include/sal.h

@@ -82,8 +82,9 @@ struct sal_socket
 
 struct proto_family
 {
-    int family;                        /* primary protocol families type*/
-    int sec_family;                    /* secondary protocol families type*/
+    char name[RT_NAME_MAX];
+    int family;                        /* primary protocol families type */
+    int sec_family;                    /* secondary protocol families type */
     int             (*create)(struct sal_socket *sal_socket, int type, int protocol);   /* register socket options */
 
     struct hostent* (*gethostbyname)  (const char *name);
@@ -92,10 +93,14 @@ struct proto_family
     int             (*getaddrinfo)    (const char *nodename, const char *servname, const struct addrinfo *hints, struct addrinfo **res);
 };
 
-/* SAL socket initialization */
+/* SAL(Socket Abstraction Layer) initialize */
 int sal_init(void);
 
-int sal_proto_family_register(const struct proto_family *pf);
 struct sal_socket *sal_get_socket(int sock);
 
+/* protocol family register and unregister operate */
+int sal_proto_family_register(const struct proto_family *pf);
+int sal_proto_family_unregister(const struct proto_family *pf);
+struct proto_family *sal_proto_family_find(const char *name);
+
 #endif /* SAL_H__ */

components/net/sal_socket/socket/net_netdb.c

@@ -38,6 +38,7 @@ int gethostbyname_r(const char *name, struct hostent *ret, char *buf,
 {
     return sal_gethostbyname_r(name, ret, buf, buflen, result, h_errnop);
 }
+RTM_EXPORT(gethostbyname_r);
 
 void freeaddrinfo(struct addrinfo *ai)
 {

components/net/sal_socket/src/sal_socket.c

@@ -50,7 +50,7 @@ static struct rt_mutex sal_core_lock;
 static rt_bool_t init_ok = RT_FALSE;
 
 /**
- * SAL (Socket Abstraction Layer) initialization.
+ * SAL (Socket Abstraction Layer) initialize.
  *
  * @return result
  *         >= 0: initialize success
@@ -64,7 +64,7 @@ int sal_init(void)
     }
 
     /* clean sal socket table */
-    memset(&socket_table, 0, sizeof(socket_table));
+    rt_memset(&socket_table, 0, sizeof(socket_table));
     /* create sal socket lock */
     rt_mutex_init(&sal_core_lock, "sal_lock", RT_IPC_FLAG_FIFO);
 
@@ -76,12 +76,12 @@ int sal_init(void)
 INIT_COMPONENT_EXPORT(sal_init);
 
 /**
- *  this function will register the current protocol family to the global array of protocol families.
+ * This function will register protocol family to the global array of protocol families.
  *
- * @param pf protocol families structure
+ * @param pf protocol family object
  *
- * @return 0 : protocol families structure index
- *        -1 : the global array of available protocol families is full
+ * @return >=0 : protocol family object index
+ *          -1 : the global array of available protocol families is full
  */
 int sal_proto_family_register(const struct proto_family *pf)
 {
@@ -91,6 +91,18 @@ int sal_proto_family_register(const struct proto_family *pf)
     /* disable interrupt */
     level = rt_hw_interrupt_disable();
 
+    /* check protocol family is already registered */
+    for(idx = 0; idx < SAL_PROTO_FAMILIES_NUM; idx++)
+    {
+        if(rt_strcmp(proto_families[idx].name, pf->name) == 0)
+        {
+            /* enable interrupt */
+            rt_hw_interrupt_enable(level);
+            LOG_E("%s protocol family is already registered!", pf->name);
+            return -1;
+        }
+    }
+
     /* find an empty protocol family entry */
     for(idx = 0; idx < SAL_PROTO_FAMILIES_NUM && proto_families[idx].create; idx++);
 
@@ -99,10 +111,10 @@ int sal_proto_family_register(const struct proto_family *pf)
     {
         /* enable interrupt */
         rt_hw_interrupt_enable(level);
-
         return -1;
     }
 
+    rt_strncpy(proto_families[idx].name, pf->name, rt_strlen(pf->name));
     proto_families[idx].family = pf->family;
     proto_families[idx].sec_family = pf->sec_family;
     proto_families[idx].create = pf->create;
@@ -119,11 +131,62 @@ int sal_proto_family_register(const struct proto_family *pf)
 }
 
 /**
- *  this function will get socket structure by sal socket descriptor
+ * This function removes a previously registered protocol family object.
+ *
+ * @param pf protocol family object
+ *
+ * @return >=0 : unregister protocol family index
+ *          -1 : unregister failed
+ */
+int sal_proto_family_unregister(const struct proto_family *pf)
+{
+    int idx = 0;
+
+    RT_ASSERT(pf != RT_NULL);
+
+    for(idx = 0; idx < SAL_PROTO_FAMILIES_NUM; idx++)
+    {
+        if(rt_strcmp(proto_families[idx].name, pf->name) == 0)
+        {
+            rt_memset(&proto_families[idx], 0x00, sizeof(struct proto_family));
+
+            return idx;
+        }
+    }
+
+    return -1;
+}
+
+/**
+ * This function will get protocol family by name.
+ *
+ * @param name protocol family name
+ *
+ * @return protocol family object
+ */
+struct proto_family *sal_proto_family_find(const char *name)
+{
+    int idx = 0;
+
+    RT_ASSERT(name != RT_NULL);
+
+    for (idx = 0; idx < SAL_PROTO_FAMILIES_NUM; idx++)
+    {
+        if (rt_strcmp(proto_families[idx].name, name) == 0)
+        {
+            return &proto_families[idx];
+        }
+    }
+
+    return RT_NULL;
+}
+
+/**
+ * This function will get sal socket object by sal socket descriptor.
  *
  * @param socket sal socket index
  *
- * @return socket structure of the current sal socket index
+ * @return sal socket object of the current sal socket index
  */
 struct sal_socket *sal_get_socket(int socket)
 {
@@ -145,7 +208,7 @@ struct sal_socket *sal_get_socket(int socket)
 }
 
 /**
- * this function will lock sal socket.
+ * This function will lock sal socket.
  *
  * @note please don't invoke it on ISR.
  */
@@ -161,7 +224,7 @@ static void sal_lock(void)
 }
 
 /**
- * this function will lock sal socket.
+ * This function will lock sal socket.
  *
  * @note please don't invoke it on ISR.
  */
@@ -171,7 +234,7 @@ static void sal_unlock(void)
 }
 
 /**
- *  this function will get protocol family structure by family type
+ * This function will get protocol family structure by family type
  *
  * @param family  protocol family
  *
@@ -201,17 +264,17 @@ static struct proto_family *get_proto_family(int family)
 }
 
 /**
- *  this function will initialize socket structure and set socket options
+ * This function will initialize sal socket object and set socket options
  *
  * @param family    protocol family
  * @param type      socket type
  * @param protocol  transfer Protocol
- * @param res       socket structure address
+ * @param res       sal socket object address
  *
  * @return  0 : socket initialize success
  *         -1 : input the wrong family
  *         -2 : input the wrong socket type
- *         -3 : get protocol family structure failed
+ *         -3 : get protocol family object failed
  *         -4 : set socket options failed
  */
 static int socket_init(int family, int type, int protocol, struct sal_socket **res)
@@ -234,7 +297,7 @@ static int socket_init(int family, int type, int protocol, struct sal_socket **r
     sock->type = type;
     sock->protocol = protocol;
 
-    /* get socket protocol family structure */
+    /* get socket protocol family object */
     if ((pf = get_proto_family(family)) == RT_NULL)
     {
         return -3;
@@ -301,11 +364,6 @@ __result:
 
 }
 
-/**
- * this function will return a empty sal socket structure address
- *
- * @return sal socket structure address
- */
 static int socket_new(void)
 {
     struct sal_socket *sock;
@@ -415,7 +473,7 @@ int sal_shutdown(int socket, int how)
 
     if (sock->ops->shutdown((int) sock->user_data, how) == 0)
     {
-        memset(sock, 0x00, sizeof(struct sal_socket));
+        rt_memset(sock, 0x00, sizeof(struct sal_socket));
         return 0;
     }
 
@@ -622,7 +680,7 @@ int sal_closesocket(int socket)
 
     if (sock->ops->closesocket((int) sock->user_data) == 0)
     {
-        memset(sock, 0x00, sizeof(struct sal_socket));
+        rt_memset(sock, 0x00, sizeof(struct sal_socket));
         return 0;
     }
 
@@ -669,12 +727,18 @@ int sal_poll(struct dfs_fd *file, struct rt_pollreq *req)
 struct hostent *sal_gethostbyname(const char *name)
 {
     int i;
+    struct hostent *hst;
 
     for (i = 0; i < SAL_PROTO_FAMILIES_NUM; ++i)
     {
         if (proto_families[i].gethostbyname)
         {
-            return proto_families[i].gethostbyname(name);
+            hst = proto_families[i].gethostbyname(name);
+            if (hst != RT_NULL)
+            {
+                return hst;
+            }
+            continue;
         }
     }
 
@@ -684,13 +748,18 @@ struct hostent *sal_gethostbyname(const char *name)
 int sal_gethostbyname_r(const char *name, struct hostent *ret, char *buf,
                 size_t buflen, struct hostent **result, int *h_errnop)
 {
-    int i;
+    int i, res;
 
     for (i = 0; i < SAL_PROTO_FAMILIES_NUM; ++i)
     {
         if (proto_families[i].gethostbyname_r)
         {
-            return proto_families[i].gethostbyname_r(name, ret, buf, buflen, result, h_errnop);
+            res = proto_families[i].gethostbyname_r(name, ret, buf, buflen, result, h_errnop);
+            if (res == 0)
+            {
+                return res;
+            }
+            continue;
         }
     }
 
@@ -716,13 +785,18 @@ int sal_getaddrinfo(const char *nodename,
        const struct addrinfo *hints,
        struct addrinfo **res)
 {
-    int i;
+    int i, ret;
 
     for (i = 0; i < SAL_PROTO_FAMILIES_NUM; ++i)
     {
         if (proto_families[i].getaddrinfo)
         {
-            return proto_families[i].getaddrinfo(nodename, servname, hints, res);
+            ret = proto_families[i].getaddrinfo(nodename, servname, hints, res);
+            if (ret == 0)
+            {
+                return ret;
+            }
+            continue;
         }
     }