Set the error message for "permission denied" errors.

[libpcap] / pcap-linux.c

diff --git a/pcap-linux.c b/pcap-linux.c
index 701112c235b959c20c7cbb7b61080b51e42116b5..49fe1026c100fbffa65bd3fe008c4f8aaed71343 100644 (file)
--- a/pcap-linux.c
+++ b/pcap-linux.c
@@ -2305,6 +2305,8 @@ activate_pf_packet(pcap_t *handle, int is_any_device)
                         * socket.
                         */
                        status = PCAP_ERROR_PERM_DENIED;
+                       snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+                           "Attempt to create packet socket failed - CAP_NET_RAW may be required");
                } else {
                        /*
                         * Other error.
@@ -3113,6 +3115,9 @@ create_ring(pcap_t *handle, int *status)
                pcap_strlcpy(ifr.ifr_name, handle->opt.device, sizeof(ifr.ifr_name));
                ifr.ifr_data = (void *)&hwconfig;
 
+               /*
+                * This may require CAP_NET_ADMIN.
+                */
                if (ioctl(handle->fd, SIOCSHWTSTAMP, &ifr) < 0) {
                        switch (errno) {
 
@@ -3125,6 +3130,8 @@ create_ring(pcap_t *handle, int *status)
                                 * try requesting hardware time stamps.
                                 */
                                *status = PCAP_ERROR_PERM_DENIED;
+                               snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+                                   "Attempt to set hardware timestamp failed - CAP_NET_ADMIN may be required");
                                return -1;
 
                        case EOPNOTSUPP: