[DPDK/other Bug 1562] dumpcap captures all available network interfaces when specifying any PCI network interface

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1562

            Bug ID: 1562
           Summary: dumpcap captures all available network interfaces when
                    specifying any PCI network interface
           Product: DPDK
           Version: 21.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: other
          Assignee: dev at dpdk.org
          Reporter: zhengliang1701 at 163.com
  Target Milestone: ---

Created attachment 291
  --> https://bugs.dpdk.org/attachment.cgi?id=291&action=edit
Specifying a non-existent PCI network interface results in packet capture on
all valid network interfaces on the host.

When specifying a non-existent network interface or any PCI network interface,
all valid PCI network interfaces are captured. The reason is in the static void
select_interface(const char arg) function, which was intended to match all
network interfaces when specified with the '' character. However, the if
(strcmp(arg, "")) selects all interfaces. After modification to if (strcmp(arg,
"")==0), it works correctly to specify a single network interface.

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