pcap_setdirection(3) - NetBSD Manual Pages

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PCAP_SETDIRECTION(3)                                      PCAP_SETDIRECTION(3)




NAME

       pcap_setdirection  -  set  the direction for which packets will be cap-
       tured


SYNOPSIS

       #include <pcap/pcap.h>

       int pcap_setdirection(pcap_t *p, pcap_direction_t d);


DESCRIPTION

       pcap_setdirection() is used to specify a direction that packets will be
       captured.    d  is  one  of  the  constants  PCAP_D_IN,  PCAP_D_OUT  or
       PCAP_D_INOUT.  PCAP_D_IN will only  capture  packets  received  by  the
       device,  PCAP_D_OUT  will  only  capture packets sent by the device and
       PCAP_D_INOUT will capture packets received by or sent  by  the  device.
       PCAP_D_INOUT is the default setting if this function is not called.

       pcap_setdirection() isn't necessarily fully supported on all platforms;
       some platforms might return an error for all  values,  and  some  other
       platforms might not support PCAP_D_OUT.

       This operation is not supported if a ``savefile'' is being read.


RETURN VALUE

       pcap_setdirection()  returns  0 on success, PCAP_ERROR_NOT_ACTIVATED if
       called on a capture handle that has been created but not activated,  or
       PCAP_ERROR  on  other errors. If PCAP_ERROR is returned, pcap_geterr(3)
       or pcap_perror(3) may be called with p as an argument to fetch or  dis-
       play the error text.


SEE ALSO

       pcap(3)



                                 5 March 2022             PCAP_SETDIRECTION(3)