build, lib, ipcpd, irmd: Add support for libgcrypt

This adds support for libgcrypt. If at least version 1.7.0 of
libgcrypt is present, it may be used for secure random number
generation and is used for hashing in the irmd/ipcp.

The hash definitions are moved to the internal hash.h header, and
defined independently of the hashes that are defined as part of the
directory policy for the normal IPCP. The translation is moved from
the IRMd to ipcpd/ipcp.h. The bootstrap call from the IRMd expects the
IPCP to return the correct hash algorithm with a dif_info struct,
which is in line with the behavior of the enroll call.

This also improves how some platform checks in the build system are
handled.

3 files changed, 46 insertions, 14 deletions

diff --git a/src/ipcpd/ipcp.c b/src/ipcpd/ipcp.c
index 48ff046c..b2afdf99 100644
--- a/src/ipcpd/ipcp.c
+++ b/src/ipcpd/ipcp.c
@@ -23,6 +23,7 @@
 #define OUROBOROS_PREFIX "ipcpd/ipcp"
 
 #include <ouroboros/config.h>
+#include <ouroboros/hash.h>
 #include <ouroboros/logs.h>
 #include <ouroboros/time_utils.h>
 #include <ouroboros/utils.h>
@@ -174,7 +175,7 @@ static void * mainloop(void * o)
                         strcpy(conf.dif_info.dif_name,
                                conf_msg->dif_info->dif_name);
                         if (conf.dif_info.dif_name == NULL) {
-                                ret_msg.has_result = true;
+                                log_err("No DIF name provided.");
                                 ret_msg.result = -1;
                                 break;
                         }
@@ -186,21 +187,55 @@ static void * mainloop(void * o)
                                 conf.dt_gam_type    = conf_msg->dt_gam_type;
                                 conf.rm_gam_type    = conf_msg->rm_gam_type;
                                 conf.routing_type   = conf_msg->routing_type;
-                                conf.dif_info.dir_hash_algo =
-                                        conf_msg->dif_info->dir_hash_algo;
+
+                                switch(conf_msg->dif_info->dir_hash_algo) {
+                                case DIR_HASH_SHA3_224:
+                                        conf.dif_info.dir_hash_algo
+                                                = HASH_SHA3_224;
+                                        break;
+                                case DIR_HASH_SHA3_256:
+                                        conf.dif_info.dir_hash_algo
+                                                = HASH_SHA3_256;
+                                        break;
+                                case DIR_HASH_SHA3_384:
+                                        conf.dif_info.dir_hash_algo
+                                                = HASH_SHA3_384;
+                                        break;
+                                case DIR_HASH_SHA3_512:
+                                        conf.dif_info.dir_hash_algo
+                                                = HASH_SHA3_512;
+                                        break;
+                                default:
+                                        assert(false);
+                                }
+
+                                dif_info.dir_hash_algo =
+                                        conf.dif_info.dir_hash_algo;
                         }
 
                         if (conf_msg->ipcp_type == IPCP_SHIM_UDP) {
-                                conf.ip_addr  = conf_msg->ip_addr;
-                                conf.dns_addr = conf_msg->dns_addr;
+                                conf.ip_addr           = conf_msg->ip_addr;
+                                conf.dns_addr          = conf_msg->dns_addr;
+                                dif_info.dir_hash_algo = HASH_MD5;
+                                ipcpi.dir_hash_algo    = HASH_MD5;
                         }
 
-                        if (conf_msg->ipcp_type == IPCP_SHIM_ETH_LLC)
-                                conf.if_name = conf_msg->if_name;
+                        if (conf_msg->ipcp_type == IPCP_SHIM_ETH_LLC) {
+                                conf.if_name           = conf_msg->if_name;
+                                dif_info.dir_hash_algo = HASH_SHA3_256;
+                                ipcpi.dir_hash_algo    = HASH_SHA3_256;
+                        }
 
-                        ipcpi.dir_hash_algo = conf_msg->dif_info->dir_hash_algo;
+                        if (conf_msg->ipcp_type == IPCP_LOCAL) {
+                                dif_info.dir_hash_algo = HASH_SHA3_256;
+                                ipcpi.dir_hash_algo    = HASH_SHA3_256;
+                        }
 
                         ret_msg.result = ipcpi.ops->ipcp_bootstrap(&conf);
+                        if (ret_msg.result == 0) {
+                                ret_msg.dif_info       = &dif_info;
+                                dif_info.dif_name      = conf.dif_info.dif_name;
+                        }
                         break;
                 case IPCP_MSG_CODE__IPCP_ENROLL:
                         ret_msg.has_result = true;
@@ -220,7 +255,7 @@ static void * mainloop(void * o)
                         ret_msg.result = ipcpi.ops->ipcp_enroll(msg->dst_name,
                                                                 &info);
                         if (ret_msg.result == 0) {
-                                ret_msg.dif_info = &dif_info;
+                                ret_msg.dif_info       = &dif_info;
                                 dif_info.dir_hash_algo = info.dir_hash_algo;
                                 dif_info.dif_name      = info.dif_name;
                         }
diff --git a/src/ipcpd/normal/dt_pci.c b/src/ipcpd/normal/dt_pci.c
index a4f99142..2a252545 100644
--- a/src/ipcpd/normal/dt_pci.c
+++ b/src/ipcpd/normal/dt_pci.c
@@ -22,7 +22,6 @@
 
 #include <ouroboros/config.h>
 #include <ouroboros/errno.h>
-#include <ouroboros/crc32.h>
 #include <ouroboros/rib.h>
 
 #include "dt_pci.h"
diff --git a/src/ipcpd/shim-eth-llc/CMakeLists.txt b/src/ipcpd/shim-eth-llc/CMakeLists.txt
index 08f50c04..12bfb42e 100644
--- a/src/ipcpd/shim-eth-llc/CMakeLists.txt
+++ b/src/ipcpd/shim-eth-llc/CMakeLists.txt
@@ -32,12 +32,10 @@ add_executable(ipcpd-shim-eth-llc ${SHIM_ETH_LLC_SOURCES} ${IPCP_SOURCES}
 target_link_libraries(ipcpd-shim-eth-llc LINK_PUBLIC ouroboros
   ${PROTOBUF_C_LIBRARY})
 
-if (${NETMAP_C_INCLUDE_DIR} STREQUAL "NETMAP_C_INCLUDE_DIR-NOTFOUND")
-  message(STATUS "Could not find netmap. Install for better performance.")
-else ()
+if (NOT ${NETMAP_C_INCLUDE_DIR} STREQUAL "NETMAP_C_INCLUDE_DIR-NOTFOUND")
   message(STATUS "Found netmap headers in ${NETMAP_C_INCLUDE_DIR}")
   include_directories(${NETMAP_C_INCLUDE_DIR})
-  add_compile_flags(ipcpd-shim-eth-llc -DHAVE_NETMAP)
+  set(HAVE_NETMAP "1" CACHE STRING "Have netmap")
   test_and_set_c_compiler_flag_global(-std=c99)
 endif ()