Switched OpenWrt GitHub Actions SDK to main branch

 * fixed some SonarCloud complaints
 * added more systemd CI tests
 * fixed debian package scripts to obey remove/purge
 * changed `chmod_chown()` error handling

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>

11 files changed, 107 insertions, 87 deletions

diff --git a/.github/workflows/build-openwrt.yml b/.github/workflows/build-openwrt.yml
index 9d329d584..a9c4b6f45 100644
--- a/.github/workflows/build-openwrt.yml
+++ b/.github/workflows/build-openwrt.yml
@@ -42,7 +42,7 @@ jobs:
           fetch-depth: 1
 
       - name: Build
-        uses: openwrt/gh-action-sdk@v7
+        uses: openwrt/gh-action-sdk@main
         env:
           ARCH: ${{ matrix.arch }}-snapshot
           FEED_DIR: ${{ github.workspace }}/packages/openwrt
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3586efd9d..2ead2c26a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -285,8 +285,12 @@ jobs:
           sudo systemctl enable ndpid@lo
           sudo systemctl start ndpid@lo
           SYSTEMCTL_RET=3; while (( $SYSTEMCTL_RET == 3 )); do systemctl is-active ndpid@lo.service; SYSTEMCTL_RET=$?; sleep 1; done
-          sudo systemctl status ndpisrvd.service ndpid@lo.service || true
-          sudo systemctl show ndpisrvd.service ndpid@lo.service -p SubState,ActiveState || true
+          sudo systemctl status ndpisrvd.service ndpid@lo.service
+          sudo systemctl show ndpisrvd.service ndpid@lo.service -p SubState,ActiveState
+          sudo dpkg -i ./build/nDPId-*.deb
+          sudo systemctl status ndpisrvd.service ndpid@lo.service
+          sudo systemctl show ndpisrvd.service ndpid@lo.service -p SubState,ActiveState
+          sudo systemctl stop ndpisrvd.service
           journalctl --no-tail --no-pager -u ndpisrvd.service -u ndpid@lo.service
       - name: Build PF_RING and nDPId (invoke CC directly - dynamic nDPI lib)
         if: endsWith(matrix.compiler, 'gcc-7') == false && startsWith(matrix.ndpi_build, '-DBUILD_NDPI=ON') && startsWith(matrix.coverage, '-DENABLE_COVERAGE=OFF') && startsWith(matrix.sanitizer, '-DENABLE_SANITIZER=ON') && startsWith(matrix.ndpid_gcrypt, '-DNDPI_WITH_GCRYPT=OFF') && startsWith(matrix.ndpid_zlib, '-DENABLE_ZLIB=ON')
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 787e30037..79f538de9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -267,25 +267,27 @@ if(BUILD_EXAMPLES)
         pkg_check_modules(CURL REQUIRED libcurl)
     endif()
 endif()
-if(NDPI_WITH_GCRYPT)
-    message(STATUS "nDPI: Enable GCRYPT")
-    set(NDPI_ADDITIONAL_ARGS "${NDPI_ADDITIONAL_ARGS} --with-local-libgcrypt")
-endif()
-if(NDPI_WITH_PCRE)
-    message(STATUS "nDPI: Enable PCRE")
-    set(NDPI_ADDITIONAL_ARGS "${NDPI_ADDITIONAL_ARGS} --with-pcre2")
-endif()
-if(NDPI_WITH_MAXMINDDB)
-    message(STATUS "nDPI: Enable MAXMINDDB")
-    set(NDPI_ADDITIONAL_ARGS "${NDPI_ADDITIONAL_ARGS} --with-maxminddb")
-endif()
-if(ENABLE_COVERAGE)
-    message(STATUS "nDPI: Enable Coverage")
-    set(NDPI_ADDITIONAL_ARGS "${NDPI_ADDITIONAL_ARGS} --enable-code-coverage")
-endif()
-if(CMAKE_BUILD_TYPE STREQUAL "Debug" OR CMAKE_BUILD_TYPE STREQUAL "")
-    message(STATUS "nDPI: Enable Debug Build")
-    set(NDPI_ADDITIONAL_ARGS "${NDPI_ADDITIONAL_ARGS} --enable-debug-build --enable-debug-messages")
+if(BUILD_NDPI)
+    if(NDPI_WITH_GCRYPT)
+        message(STATUS "nDPI: Enable GCRYPT")
+        set(NDPI_ADDITIONAL_ARGS "${NDPI_ADDITIONAL_ARGS} --with-local-libgcrypt")
+    endif()
+    if(NDPI_WITH_PCRE)
+        message(STATUS "nDPI: Enable PCRE")
+        set(NDPI_ADDITIONAL_ARGS "${NDPI_ADDITIONAL_ARGS} --with-pcre2")
+    endif()
+    if(NDPI_WITH_MAXMINDDB)
+        message(STATUS "nDPI: Enable MAXMINDDB")
+        set(NDPI_ADDITIONAL_ARGS "${NDPI_ADDITIONAL_ARGS} --with-maxminddb")
+    endif()
+    if(ENABLE_COVERAGE)
+        message(STATUS "nDPI: Enable Coverage")
+        set(NDPI_ADDITIONAL_ARGS "${NDPI_ADDITIONAL_ARGS} --enable-code-coverage")
+    endif()
+    if(CMAKE_BUILD_TYPE STREQUAL "Debug" OR CMAKE_BUILD_TYPE STREQUAL "")
+        message(STATUS "nDPI: Enable Debug Build")
+        set(NDPI_ADDITIONAL_ARGS "${NDPI_ADDITIONAL_ARGS} --enable-debug-build --enable-debug-messages")
+    endif()
 endif()
 
 execute_process(
diff --git a/examples/c-captured/c-captured.c b/examples/c-captured/c-captured.c
index 98df7c4b8..0729d3f19 100644
--- a/examples/c-captured/c-captured.c
+++ b/examples/c-captured/c-captured.c
@@ -1355,10 +1355,14 @@ int main(int argc, char ** argv)
         return 1;
     }
 
-    if (capture_mode != 0 && chmod_chown(datadir, S_IRWXU | S_IRGRP | S_IXGRP, user, group) != 0)
+    if (capture_mode != 0)
     {
-        logger(1, "Could not chmod/chown `%s': %s", datadir, strerror(errno));
-        return 1;
+        int ret = chmod_chown(datadir, S_IRWXU | S_IRGRP | S_IXGRP, user, group);
+        if (ret != 0)
+        {
+            logger(1, "Could not chmod/chown `%s': %s", datadir, strerror(ret));
+            return 1;
+        }
     }
 
     errno = 0;
diff --git a/examples/py-semantic-validation/py-semantic-validation.py b/examples/py-semantic-validation/py-semantic-validation.py
index 9207c3b69..2345ab15c 100755
--- a/examples/py-semantic-validation/py-semantic-validation.py
+++ b/examples/py-semantic-validation/py-semantic-validation.py
@@ -86,8 +86,8 @@ def verifyFlows(nsock, instance):
                 l4_proto = 'n/a'
             invalid_flows_str += '{} proto[{},{}] ts[{} + {} < {}] diff[{}], '.format(flow_id, l4_proto, flow.flow_idle_time,
                                                          flow.flow_last_seen, flow.flow_idle_time,
-                                                         instance.most_recent_flow_time,
-                                                         instance.most_recent_flow_time -
+                                                         instance.getMostRecentFlowTime(flow.thread_id),
+                                                         instance.getMostRecentFlowTime(flow.thread_id) -
                                                          (flow.flow_last_seen + flow.flow_idle_time))
 
         raise SemanticValidationException(None, 'Flow Manager verification failed for: {}'.format(invalid_flows_str[:-2]))
diff --git a/nDPId.c b/nDPId.c
index a2048d2c7..01ef0b9e2 100644
--- a/nDPId.c
+++ b/nDPId.c
@@ -717,7 +717,10 @@ static uint64_t timer_sub(uint64_t a, uint64_t b)
 }
 
 #ifdef ENABLE_ZLIB
-static int zlib_deflate(const void * const src, int srcLen, void * dst, int dstLen)
+#define ZLIB_ERROR_COMPRESSED_SIZE (-7)
+#define ZLIB_ERROR_SIZE (-8)
+#define ZLIB_ERROR_ALLOCATION (-9)
+static uLong zlib_deflate(void * const src, int srcLen, void * const dst, int dstLen)
 {
     z_stream strm = {0};
     strm.total_in = strm.avail_in = srcLen;
@@ -730,7 +733,7 @@ static int zlib_deflate(const void * const src, int srcLen, void * dst, int dstL
     strm.opaque = Z_NULL;
 
     int err = -1;
-    int ret = -1;
+    uLong ret = 0;
 
     err = deflateInit2(&strm, Z_BEST_COMPRESSION, Z_BINARY, 15, 9, Z_HUFFMAN_ONLY);
     if (err != Z_OK)
@@ -763,7 +766,7 @@ static int zlib_deflate(const void * const src, int srcLen, void * dst, int dstL
     return ret;
 }
 
-static int zlib_inflate(const void * src, int srcLen, void * dst, int dstLen)
+static uLong zlib_inflate(void * const src, int srcLen, void * const dst, int dstLen)
 {
     z_stream strm = {0};
     strm.total_in = strm.avail_in = srcLen;
@@ -776,7 +779,7 @@ static int zlib_inflate(const void * src, int srcLen, void * dst, int dstLen)
     strm.opaque = Z_NULL;
 
     int err = -1;
-    int ret = -1;
+    uLong ret = 0;
 
     err = inflateInit2(&strm, (15 + 32)); // 15 window bits, and the +32 tells zlib to to detect if using gzip or zlib
     if (err == Z_OK)
@@ -807,61 +810,61 @@ static int zlib_inflate(const void * src, int srcLen, void * dst, int dstLen)
 static int detection_data_deflate(struct nDPId_flow * const flow)
 {
     uint8_t tmpOut[sizeof(*flow->info.detection_data)];
-    int ret;
+    uLong size;
 
     if (flow->info.detection_data_compressed_size > 0)
     {
-        return -7;
+        return ZLIB_ERROR_COMPRESSED_SIZE;
     }
 
-    ret = zlib_deflate(flow->info.detection_data, sizeof(*flow->info.detection_data), tmpOut, sizeof(tmpOut));
-    if (ret <= 0)
+    size = zlib_deflate(flow->info.detection_data, sizeof(*flow->info.detection_data), tmpOut, sizeof(tmpOut));
+    if (size == 0 || size > sizeof(*flow->info.detection_data))
     {
-        return ret;
+        return ZLIB_ERROR_SIZE;
     }
 
-    struct nDPId_detection_data * const new_det_data = ndpi_malloc(ret);
+    struct nDPId_detection_data * const new_det_data = ndpi_malloc(size);
     if (new_det_data == NULL)
     {
-        return -8;
+        return ZLIB_ERROR_ALLOCATION;
     }
     ndpi_free(flow->info.detection_data);
     flow->info.detection_data = new_det_data;
 
-    memcpy(flow->info.detection_data, tmpOut, ret);
-    flow->info.detection_data_compressed_size = ret;
+    memcpy(flow->info.detection_data, tmpOut, size);
+    flow->info.detection_data_compressed_size = (uint16_t)size;
 
-    return ret;
+    return (int)size;
 }
 
 static int detection_data_inflate(struct nDPId_flow * const flow)
 {
     uint8_t tmpOut[sizeof(*flow->info.detection_data)];
-    int ret;
+    uLong size;
 
     if (flow->info.detection_data_compressed_size == 0)
     {
-        return -7;
+        return ZLIB_ERROR_COMPRESSED_SIZE;
     }
 
-    ret = zlib_inflate(flow->info.detection_data, flow->info.detection_data_compressed_size, tmpOut, sizeof(tmpOut));
-    if (ret <= 0)
+    size = zlib_inflate(flow->info.detection_data, flow->info.detection_data_compressed_size, tmpOut, sizeof(tmpOut));
+    if (size == 0 || size > sizeof(*flow->info.detection_data))
     {
-        return ret;
+        return ZLIB_ERROR_SIZE;
     }
 
-    struct nDPId_detection_data * const new_det_data = ndpi_malloc(ret);
+    struct nDPId_detection_data * const new_det_data = ndpi_malloc(size);
     if (new_det_data == NULL)
     {
-        return -8;
+        return ZLIB_ERROR_ALLOCATION;
     }
     ndpi_free(flow->info.detection_data);
     flow->info.detection_data = new_det_data;
 
-    memcpy(flow->info.detection_data, tmpOut, ret);
+    memcpy(flow->info.detection_data, tmpOut, size);
     flow->info.detection_data_compressed_size = 0;
 
-    return ret;
+    return (int)size;
 }
 
 static void ndpi_comp_scan_walker(void const * const A, ndpi_VISIT which, int depth, void * const user_data)
@@ -900,8 +903,7 @@ static void ndpi_comp_scan_walker(void const * const A, ndpi_VISIT which, int de
                     }
 
                     int ret = detection_data_deflate(flow);
-
-                    if (ret <= 0)
+                    if (ret < 0)
                     {
                         logger(1,
                                "zLib compression failed for flow %llu with error code: %d",
@@ -2058,7 +2060,7 @@ static void process_idle_flow(struct nDPId_reader_thread * const reader_thread,
                 {
                     workflow->current_compression_diff -= flow->info.detection_data_compressed_size;
                     int ret = detection_data_inflate(flow);
-                    if (ret <= 0)
+                    if (ret < 0)
                     {
                         workflow->current_compression_diff += flow->info.detection_data_compressed_size;
                         logger(1, "zLib decompression failed with error code: %d", ret);
@@ -3053,7 +3055,7 @@ static void jsonize_flow_event(struct nDPId_reader_thread * const reader_thread,
                 {
                     workflow->current_compression_diff -= flow->info.detection_data_compressed_size;
                     int ret = detection_data_inflate(flow);
-                    if (ret <= 0)
+                    if (ret < 0)
                     {
                         workflow->current_compression_diff += flow->info.detection_data_compressed_size;
                         logger(1, "zLib decompression failed with error code: %d", ret);
@@ -3489,7 +3491,7 @@ static int process_datalink_layer(struct nDPId_reader_thread * const reader_thre
         {
             /* DLT header values can be stored as big or little endian. */
 
-            uint32_t dlt_hdr = *((uint32_t *)&packet[eth_offset]);
+            uint32_t dlt_hdr = *((uint32_t const *)&packet[eth_offset]);
 
             if (dlt_hdr == 0x02000000 || dlt_hdr == 0x02)
             {
@@ -3508,7 +3510,7 @@ static int process_datalink_layer(struct nDPId_reader_thread * const reader_thre
                                          UNKNOWN_DATALINK_LAYER,
                                          "%s%u",
                                          "layer_type",
-                                         ntohl(*((uint32_t *)&packet[eth_offset])));
+                                         ntohl(*((uint32_t const *)&packet[eth_offset])));
                     jsonize_packet_event(reader_thread, header, packet, 0, 0, 0, 0, NULL, PACKET_EVENT_PAYLOAD);
                 }
                 return 1;
@@ -3534,7 +3536,7 @@ static int process_datalink_layer(struct nDPId_reader_thread * const reader_thre
                 return 1;
             }
 
-            struct ndpi_chdlc const * const chdlc = (struct ndpi_chdlc const * const)&packet[eth_offset];
+            struct ndpi_chdlc const * const chdlc = (struct ndpi_chdlc const *)&packet[eth_offset];
             *ip_offset = sizeof(struct ndpi_chdlc);
             *layer3_type = ntohs(chdlc->proto_code);
             break;
@@ -3559,14 +3561,14 @@ static int process_datalink_layer(struct nDPId_reader_thread * const reader_thre
 
             if (packet[0] == 0x0f || packet[0] == 0x8f)
             {
-                struct ndpi_chdlc const * const chdlc = (struct ndpi_chdlc const * const)&packet[eth_offset];
+                struct ndpi_chdlc const * const chdlc = (struct ndpi_chdlc const *)&packet[eth_offset];
                 *ip_offset = sizeof(struct ndpi_chdlc); /* CHDLC_OFF = 4 */
                 *layer3_type = ntohs(chdlc->proto_code);
             }
             else
             {
                 *ip_offset = 2;
-                *layer3_type = ntohs(*((u_int16_t *)&packet[eth_offset]));
+                *layer3_type = ntohs(*(u_int16_t const *)&packet[eth_offset]);
             }
             break;
         case DLT_LINUX_SLL:
@@ -3603,7 +3605,7 @@ static int process_datalink_layer(struct nDPId_reader_thread * const reader_thre
             }
 
             struct ndpi_radiotap_header const * const radiotap =
-                (struct ndpi_radiotap_header const * const)&packet[eth_offset];
+                (struct ndpi_radiotap_header const *)&packet[eth_offset];
             uint16_t radio_len = radiotap->len;
 
             /* Check Bad FCS presence */
@@ -3635,7 +3637,7 @@ static int process_datalink_layer(struct nDPId_reader_thread * const reader_thre
 
             /* Calculate 802.11 header length (variable) */
             struct ndpi_wifi_header const * const wifi =
-                (struct ndpi_wifi_header const * const)(packet + eth_offset + radio_len);
+                (struct ndpi_wifi_header const *)(packet + eth_offset + radio_len);
             uint16_t fc = wifi->fc;
             int wifi_len = 0;
 
@@ -3660,7 +3662,7 @@ static int process_datalink_layer(struct nDPId_reader_thread * const reader_thre
             }
 
             struct ndpi_llc_header_snap const * const llc =
-                (struct ndpi_llc_header_snap const * const)(packet + eth_offset + wifi_len + radio_len);
+                (struct ndpi_llc_header_snap const *)(packet + eth_offset + wifi_len + radio_len);
             if (llc->dsap == SNAP)
             {
                 *layer3_type = ntohs(llc->snap.proto_ID);
@@ -3728,7 +3730,7 @@ static int process_datalink_layer(struct nDPId_reader_thread * const reader_thre
                     }
                     return 1;
                 }
-                ethernet = (struct ndpi_ethhdr *)&packet[eth_offset + 20];
+                ethernet = (struct ndpi_ethhdr const *)&packet[eth_offset + 20];
                 *ip_offset = sizeof(struct ndpi_ethhdr) + eth_offset;
                 *layer3_type = ntohs(ethernet->h_proto);
             }
@@ -3752,8 +3754,8 @@ static int process_datalink_layer(struct nDPId_reader_thread * const reader_thre
                     }
                     return 1;
                 }
-                *vlan_id = ntohs(*(uint16_t *)&packet[*ip_offset]) & 0xFFF;
-                *layer3_type = ntohs(*(uint16_t *)&packet[*ip_offset + 2]);
+                *vlan_id = ntohs(*(uint16_t const *)&packet[*ip_offset]) & 0xFFF;
+                *layer3_type = ntohs(*(uint16_t const *)&packet[*ip_offset + 2]);
                 *ip_offset += 4;
             }
 
@@ -4456,7 +4458,7 @@ static void ndpi_process_packet(uint8_t * const args,
             {
                 workflow->current_compression_diff -= flow_to_process->info.detection_data_compressed_size;
                 int ret = detection_data_inflate(flow_to_process);
-                if (ret <= 0)
+                if (ret < 0)
                 {
                     workflow->current_compression_diff += flow_to_process->info.detection_data_compressed_size;
                     logger(1,
diff --git a/nDPIsrvd.c b/nDPIsrvd.c
index 1e675ba5b..9e5614d27 100644
--- a/nDPIsrvd.c
+++ b/nDPIsrvd.c
@@ -1824,7 +1824,7 @@ int main(int argc, char ** argv)
                    IS_CMDARG_SET(nDPIsrvd_options.collector_group) != 0
                        ? GET_CMDARG_STR(nDPIsrvd_options.collector_group)
                        : GET_CMDARG_STR(nDPIsrvd_options.group),
-                   strerror(errno));
+                   strerror(ret));
         }
         else
         {
@@ -1832,7 +1832,7 @@ int main(int argc, char ** argv)
                    "Could not chmod/chown `%s' to user `%s': %s",
                    GET_CMDARG_STR(nDPIsrvd_options.collector_un_sockpath),
                    GET_CMDARG_STR(nDPIsrvd_options.user),
-                   strerror(errno));
+                   strerror(ret));
         }
         if (ret != -EPERM)
         {
@@ -1857,7 +1857,7 @@ int main(int argc, char ** argv)
                    IS_CMDARG_SET(nDPIsrvd_options.distributor_group) != 0
                        ? GET_CMDARG_STR(nDPIsrvd_options.distributor_group)
                        : GET_CMDARG_STR(nDPIsrvd_options.group),
-                   strerror(errno));
+                   strerror(ret));
         }
         else
         {
@@ -1865,7 +1865,7 @@ int main(int argc, char ** argv)
                    "Could not chmod/chown `%s' to user `%s': %s",
                    GET_CMDARG_STR(nDPIsrvd_options.distributor_un_sockpath),
                    GET_CMDARG_STR(nDPIsrvd_options.user),
-                   strerror(errno));
+                   strerror(ret));
         }
         if (ret != -EPERM)
         {
diff --git a/packages/debian/postrm b/packages/debian/postrm
index 0699f2a47..4d2d8c5c0 100755
--- a/packages/debian/postrm
+++ b/packages/debian/postrm
@@ -1,6 +1,11 @@
 #!/bin/sh
 
-rm -rf /run/nDPId /run/nDPIsrvd
-deluser ndpid || true
-deluser ndpisrvd || true
-delgroup ndpisrvd-distributor || true
+if [ "$1" = "remove" -o "$1" = "purge" ]; then
+    rm -rf /run/nDPId /run/nDPIsrvd
+
+    if [ "$1" = "purge" ]; then
+        deluser ndpid || true
+        deluser ndpisrvd || true
+        delgroup ndpisrvd-distributor || true
+    fi
+fi
diff --git a/packages/debian/preinst b/packages/debian/preinst
index e60ef3af3..711924022 100755
--- a/packages/debian/preinst
+++ b/packages/debian/preinst
@@ -5,12 +5,13 @@ adduser --system --no-create-home --shell=/bin/false --group ndpisrvd
 adduser --system --no-create-home --shell=/bin/false --group ndpid
 
 cat <<EOF
-**********************************************************************************
-* The that may want to access DPI data needs access to /run/nDPIsrvd/distributor *
-*                                                                                *
-* To make it accessible to a user, type:                                         *
-* sudo usermod --append --groups ndpisrvd-distributor [USER]                     *
-*                                                                                *
-* Please not that you might need to re-login to make changes take effect.        *
-**********************************************************************************
+****************************************************************************
+* The user whom may want to access DPI data needs access to:               *
+* /run/nDPIsrvd/distributor                                                *
+*                                                                          *
+* To make it accessible to [USER], type:                                   *
+* sudo usermod --append --groups ndpisrvd-distributor [USER]               *
+*                                                                          *
+* Please note that you might need to re-login to make changes take effect. *
+****************************************************************************
 EOF
diff --git a/packages/debian/prerm b/packages/debian/prerm
index 6942225bd..ed637e29c 100755
--- a/packages/debian/prerm
+++ b/packages/debian/prerm
@@ -1,3 +1,5 @@
 #!/bin/sh
 
-systemctl stop ndpisrvd.service
+if [ "$1" = "remove" -o "$1" = "purge" ]; then
+    systemctl stop ndpisrvd.service
+fi
diff --git a/utils.c b/utils.c
index 207d3f4c8..ecd5dbcc5 100644
--- a/utils.c
+++ b/utils.c
@@ -400,7 +400,7 @@ int chmod_chown(char const * const path, mode_t mode, char const * const user, c
     {
         if (chmod(path, mode) != 0)
         {
-            return -errno;
+            return errno;
         }
     }
 
@@ -415,7 +415,7 @@ int chmod_chown(char const * const path, mode_t mode, char const * const user, c
             retval = getpwnam_r(user, &pwd, buf, sizeof(buf), &result);
             if (result == NULL)
             {
-                return (retval != 0 ? -retval : -ENOENT);
+                return (retval != 0 ? retval : ENOENT);
             }
             path_uid = pwd.pw_uid;
             path_gid = pwd.pw_gid;
@@ -432,7 +432,7 @@ int chmod_chown(char const * const path, mode_t mode, char const * const user, c
         retval = getgrnam_r(group, &grp, buf, sizeof(buf), &result);
         if (result == NULL)
         {
-            return (retval != 0 ? -retval : -ENOENT);
+            return (retval != 0 ? retval : ENOENT);
         }
         path_gid = grp.gr_gid;
     }
@@ -441,7 +441,7 @@ int chmod_chown(char const * const path, mode_t mode, char const * const user, c
     {
         if (chown(path, path_uid, path_gid) != 0)
         {
-            return -errno;
+            return errno;
         }
     }