Update config.{guess,sub}, timestamps 2023-01-01,2023-01-21

[libpcap] / pcap-snit.c

diff --git a/pcap-snit.c b/pcap-snit.c
index ca6222cf01666aac7d185a281ff6dac6eaf146e0..3f4e69d7186329c8018d504652e667b1ee5c27e6 100644 (file)
--- a/pcap-snit.c
+++ b/pcap-snit.c
@@ -139,6 +139,9 @@ pcap_read_snit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 
        /*
         * loop through each snapshot in the chunk
+        *
+        * This assumes that a single buffer of packets will have
+        * <= INT_MAX packets, so the packet count doesn't overflow.
         */
        n = 0;
        ep = bp + cc;
@@ -331,12 +334,16 @@ pcap_activate_snit(pcap_t *p)
        if (fd < 0 && errno == EACCES)
                p->fd = fd = open(dev, O_RDONLY);
        if (fd < 0) {
-               if (errno == EACCES)
+               if (errno == EACCES) {
                        err = PCAP_ERROR_PERM_DENIED;
-               else
+                       snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+                           "Attempt to open %s failed with EACCES - root privileges may be required",
+                           dev);
+               } else {
                        err = PCAP_ERROR;
-               pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
-                   errno, "%s", dev);
+                       pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
+                           errno, "%s", dev);
+               }
                goto bad;
        }