[Qemu-devel] [PATCH v2 3/4] linux-user: add a function hook to translate sockaddr

[Laurent Vivier]

Signed-off-by: Laurent Vivier <laur...@vivier.eu>
---
 linux-user/syscall.c | 41 ++++++++++++++++++++++++++++++++++++-----
 1 file changed, 36 insertions(+), 5 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 41b85b4..31b5c2c 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -296,9 +296,11 @@ static bitmask_transtbl fcntl_flags_tbl[] = {
 };
 
 typedef abi_long (*TargetFdDataFunc)(void *, size_t);
+typedef abi_long (*TargetFdAddrFunc)(void *, abi_ulong, socklen_t);
 typedef struct TargetFdTrans {
     TargetFdDataFunc host_to_target_data;
     TargetFdDataFunc target_to_host_data;
+    TargetFdAddrFunc target_to_host_addr;
 } TargetFdTrans;
 
 static TargetFdTrans **target_fd_trans;
@@ -313,6 +315,14 @@ static TargetFdDataFunc fd_trans_host_to_target_data(int 
fd)
     return NULL;
 }
 
+static TargetFdAddrFunc fd_trans_target_to_host_addr(int fd)
+{
+    if (fd < target_fd_max && target_fd_trans[fd]) {
+        return target_fd_trans[fd]->target_to_host_addr;
+    }
+    return NULL;
+}
+
 static void fd_trans_register(int fd, TargetFdTrans *trans)
 {
     unsigned int oldmax;
@@ -2115,7 +2125,12 @@ static abi_long do_bind(int sockfd, abi_ulong 
target_addr,
 
     addr = alloca(addrlen+1);
 
-    ret = target_to_host_sockaddr(addr, target_addr, addrlen);
+    if (fd_trans_target_to_host_addr(sockfd)) {
+        ret = fd_trans_target_to_host_addr(sockfd)(addr, target_addr,
+                                                   addrlen);
+    } else {
+        ret = target_to_host_sockaddr(addr, target_addr, addrlen);
+    }
     if (ret)
         return ret;
 
@@ -2135,7 +2150,12 @@ static abi_long do_connect(int sockfd, abi_ulong 
target_addr,
 
     addr = alloca(addrlen+1);
 
-    ret = target_to_host_sockaddr(addr, target_addr, addrlen);
+    if (fd_trans_target_to_host_addr(sockfd)) {
+        ret = fd_trans_target_to_host_addr(sockfd)(addr, target_addr,
+                                                   addrlen);
+    } else {
+        ret = target_to_host_sockaddr(addr, target_addr, addrlen);
+    }
     if (ret)
         return ret;
 
@@ -2155,8 +2175,14 @@ static abi_long do_sendrecvmsg_locked(int fd, struct 
target_msghdr *msgp,
     if (msgp->msg_name) {
         msg.msg_namelen = tswap32(msgp->msg_namelen);
         msg.msg_name = alloca(msg.msg_namelen+1);
-        ret = target_to_host_sockaddr(msg.msg_name, tswapal(msgp->msg_name),
-                                msg.msg_namelen);
+        if (fd_trans_target_to_host_addr(fd)) {
+            ret = fd_trans_target_to_host_addr(fd)(msg.msg_name,
+                                                   tswapal(msgp->msg_name),
+                                                   msg.msg_namelen);
+        } else {
+            ret = target_to_host_sockaddr(msg.msg_name, 
tswapal(msgp->msg_name),
+                                          msg.msg_namelen);
+        }
         if (ret) {
             goto out2;
         }
@@ -2418,7 +2444,12 @@ static abi_long do_sendto(int fd, abi_ulong msg, size_t 
len, int flags,
         return -TARGET_EFAULT;
     if (target_addr) {
         addr = alloca(addrlen+1);
-        ret = target_to_host_sockaddr(addr, target_addr, addrlen);
+        if (fd_trans_target_to_host_addr(fd)) {
+            ret = fd_trans_target_to_host_addr(fd)(addr, target_addr,
+                                                   addrlen);
+        } else {
+            ret = target_to_host_sockaddr(addr, target_addr, addrlen);
+        }
         if (ret) {
             unlock_user(host_msg, msg, 0);
             return ret;
-- 
2.4.3