lib: Make UNIX socket buffer size configurable0.11.3

This makes the buffer size used by the UNIX sockets configurable. In
case of a lot of IPCPs in the system it might become too small with
the default value, resulting in irm command failures. The user can now
easily configure it with an adequate value.

Signed-off-by: Sander Vrijders <sander.vrijders@ugent.be>
Signed-off-by: Dimitri Staessens <dimitri.staessens@ugent.be>

7 files changed, 26 insertions, 14 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1f888d1e..062d92b2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,7 @@ include(GNUInstallDirs)
 
 set(PACKAGE_VERSION_MAJOR  0)
 set(PACKAGE_VERSION_MINOR 11)
-set(PACKAGE_VERSION_PATCH  2)
+set(PACKAGE_VERSION_PATCH  3)
 
 set(PACKAGE_NAME        "${CMAKE_PROJECT_NAME}")
 set(PACKAGE_DESCRIPTION "The Ouroboros prototype")
diff --git a/include/ouroboros/CMakeLists.txt b/include/ouroboros/CMakeLists.txt
index c0a83030..fe0ccf5d 100644
--- a/include/ouroboros/CMakeLists.txt
+++ b/include/ouroboros/CMakeLists.txt
@@ -1,6 +1,12 @@
 configure_file("${CMAKE_CURRENT_SOURCE_DIR}/version.h.in"
   "${CMAKE_CURRENT_BINARY_DIR}/version.h" @ONLY)
 
+set(SOCK_BUF_SIZE 10240 CACHE STRING
+    "Size of the buffer used by the UNIX sockets for local IPC")
+
+configure_file("${CMAKE_CURRENT_SOURCE_DIR}/sockets.h.in"
+  "${CMAKE_CURRENT_BINARY_DIR}/sockets.h" @ONLY)
+
 set(HEADER_FILES
   cacep.h
   cdefs.h
diff --git a/include/ouroboros/sockets.h b/include/ouroboros/sockets.h.in
index 36ea4da9..4557a9ef 100644
--- a/include/ouroboros/sockets.h
+++ b/include/ouroboros/sockets.h.in
@@ -40,10 +40,9 @@ typedef IpcpMsg ipcp_msg_t;
 #define SOCK_PATH_SUFFIX ".sock"
 
 #define IRM_SOCK_PATH SOCK_PATH "irm" SOCK_PATH_SUFFIX
-#define IRM_MSG_BUF_SIZE 2048
-
 #define IPCP_SOCK_PATH_PREFIX SOCK_PATH "ipcp"
-#define IPCP_MSG_BUF_SIZE IRM_MSG_BUF_SIZE
+
+#define SOCK_BUF_SIZE @SOCK_BUF_SIZE@
 
 /* Returns the full socket path of an IPCP */
 char *      ipcp_sock_path(pid_t pid);
diff --git a/src/ipcpd/ipcp.c b/src/ipcpd/ipcp.c
index dfb88057..8dc7751a 100644
--- a/src/ipcpd/ipcp.c
+++ b/src/ipcpd/ipcp.c
@@ -55,7 +55,7 @@
 struct cmd {
         struct list_head next;
 
-        uint8_t          cbuf[IPCP_MSG_BUF_SIZE];
+        uint8_t          cbuf[SOCK_BUF_SIZE];
         size_t           len;
         int              fd;
 };
@@ -146,7 +146,7 @@ static void * acceptloop(void * o)
                         break;
                 }
 
-                cmd->len = read(csockfd, cmd->cbuf, IPCP_MSG_BUF_SIZE);
+                cmd->len = read(csockfd, cmd->cbuf, SOCK_BUF_SIZE);
                 if (cmd->len <= 0) {
                         log_err("Failed to read from socket.");
                         close(csockfd);
diff --git a/src/irmd/ipcp.c b/src/irmd/ipcp.c
index 49bf13c9..dc8f1c6e 100644
--- a/src/irmd/ipcp.c
+++ b/src/irmd/ipcp.c
@@ -53,7 +53,7 @@ ipcp_msg_t * send_recv_ipcp_msg(pid_t        pid,
                                 ipcp_msg_t * msg)
 {
        int            sockfd    = 0;
-       uint8_t        buf[IPCP_MSG_BUF_SIZE];
+       uint8_t        buf[SOCK_BUF_SIZE];
        char *         sock_path = NULL;
        ssize_t        len;
        ipcp_msg_t *   recv_msg  = NULL;
@@ -116,7 +116,7 @@ ipcp_msg_t * send_recv_ipcp_msg(pid_t        pid,
        ipcp_msg__pack(msg, buf);
 
        if (write(sockfd, buf, len) != -1)
-               len = read(sockfd, buf, IPCP_MSG_BUF_SIZE);
+               len = read(sockfd, buf, SOCK_BUF_SIZE);
 
        if (len > 0)
                recv_msg = ipcp_msg__unpack(NULL, len, buf);
diff --git a/src/irmd/main.c b/src/irmd/main.c
index db9d7bbd..b2a521d5 100644
--- a/src/irmd/main.c
+++ b/src/irmd/main.c
@@ -68,7 +68,7 @@
 #define IRMD_CLEANUP_TIMER ((IRMD_FLOW_TIMEOUT / 20) * MILLION) /* ns */
 #define SHM_SAN_HOLDOFF 1000 /* ms */
 #define IPCP_HASH_LEN(e) hash_len(e->dir_hash_algo)
-#define IB_LEN IRM_MSG_BUF_SIZE
+#define IB_LEN SOCK_BUF_SIZE
 
 enum init_state {
         IPCP_NULL = 0,
@@ -1862,7 +1862,7 @@ static void * acceptloop(void * o)
                         break;
                 }
 
-                cmd->len = read(csockfd, cmd->cbuf, IRM_MSG_BUF_SIZE);
+                cmd->len = read(csockfd, cmd->cbuf, SOCK_BUF_SIZE);
                 if (cmd->len <= 0) {
                         log_err("Failed to read from socket.");
                         close(csockfd);
diff --git a/src/lib/sockets.c b/src/lib/sockets.c
index 6e7d4ad5..b148b7ca 100644
--- a/src/lib/sockets.c
+++ b/src/lib/sockets.c
@@ -33,12 +33,19 @@
 #include <stdbool.h>
 #include <sys/time.h>
 
+/* Apple doesn't support SEQPACKET. */
+#ifdef __APPLE__
+#define SOCK_TYPE SOCK_STREAM
+#else
+#define SOCK_TYPE SOCK_SEQPACKET
+#endif
+
 int client_socket_open(char * file_name)
 {
         int sockfd;
         struct sockaddr_un serv_addr;
 
-        sockfd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
+        sockfd = socket(AF_UNIX, SOCK_TYPE, 0);
         if (sockfd < 0)
                 return -1;
 
@@ -66,7 +73,7 @@ int server_socket_open(char * file_name)
                         return -1;
         }
 
-        sockfd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
+        sockfd = socket(AF_UNIX, SOCK_TYPE, 0);
         if (sockfd < 0)
                 return -1;
 
@@ -96,7 +103,7 @@ static void close_ptr(void * o)
 irm_msg_t * send_recv_irm_msg(irm_msg_t * msg)
 {
         int         sockfd;
-        uint8_t     buf[IRM_MSG_BUF_SIZE];
+        uint8_t     buf[SOCK_BUF_SIZE];
         ssize_t     len;
         irm_msg_t * recv_msg = NULL;
 
@@ -115,7 +122,7 @@ irm_msg_t * send_recv_irm_msg(irm_msg_t * msg)
         irm_msg__pack(msg, buf);
 
         if (write(sockfd, buf, len) != -1)
-                len = read(sockfd, buf, IRM_MSG_BUF_SIZE);
+                len = read(sockfd, buf, SOCK_BUF_SIZE);
 
         if (len > 0)
                 recv_msg = irm_msg__unpack(NULL, len, buf);