�����JFIF��XX����������    $.' ",#(7),01444'9=82<.342  2!!22222222222222222222222222222222222222222222222222�����"����4���������������������������� ���������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������,�PG"Z_�4�˷����kjز�Z�,F+��_z�,�© �����zh6�٨�ic�fu������������������������������������#ډb���_�N��?�����������wQ���5-�~�I���8���������������������������������TK<5o�Iv-������������������k�_U_������������������������������~b�M��d��������Ӝ�U�Hh��?]��E�w��Q���k�{��_}qFW7HTՑ��Y��F�����?_�'ϔ��_�Ջt������������������������=||I �����6�έ"�����D���/[�k�9����Y�8������ds|\���Ҿp6�Ҵ���]��.����6���z<�v��@]�i%������������������������$j��~����g��J>��no����pM[me�i$[�����������s�o�ᘨ�˸ nɜG-�ĨU�ycP���3.DB�li�;���������������������hj���x����7Z^�N�h��������N3u{�:j�����x�힞��#M��&��jL P@��_���� P�������������������&��o8��������9������@Sz���6�t7#O�ߋ �����s}Yf�T������lmr����Z)'N��k�۞p�����w\�T���������������ȯ?�8`���O��i{wﭹW�[�r�� ��Q4F�׊������3m&L�=��h3�������z~��#����\�l :�F,j@�� ʱ�wQT����8�"kJO����6�֚l������������������}����R�>ډK���]��y����&����p�}b������;N�1�m�r$����|��7�>e�@���B�TM*-i�H��g�D�)� E�m�|�ؘbҗ�a���Ҿ����������������t4�����o���G��*oCN�rP���Q��@z,|?W[0���������:�n,j���WiE��W������$~/�hp\��?��{(�0���+�Y8rΟ�+����>S-S���������������VN;���}�s?.����� w��9��˟<���Mq4�Wv'������{)0�1mB����V����W[��������8�/<� �%���wT^�5���b��)iM� p�g�N�&ݝ������������VO~��q���u���9��� ����!��J27�����$����O-���! �:���%H��� ـ�������y�ΠM=t{!S�� �oK8�������t<����è��������:a��������[������ա�H���~��w��Qz`�p����o�^ ������Q��n����� �,uu�C��$ ^���,�������8�#��:�6��e�|~�����������!�3��3.�\0�����q��o�4`.|� ����y�Q�`~;�d�ׯ,��O�Zw�������`73�v�܋�<�����Ȏ�� ـ4k��5�K�a�u�=9Yd��$>x�A�&�� j0� ���vF��� Y���|�y��� ~�6�@c��1vOp��������Ig�����4��l�OD�����L����� R���c���j�_�uX�6��3?nk��Wy�f;^*B� ��@���~a�`��Eu�������+�����6�L��.ü>��}y���}_�O�6�͐�:�Yr���G�X��kG������l^w����������~㒶sy���Iu�!���� W ��X��N�7BV��O��!X�2����wvG�R�f�T#�����t�/?���%8�^�W�aT����G�cL�M���I��(J����1~�8�?aT ���]����AS�E��(��*E}� 2������#I/�׍qz��^t�̔���������b�Yz4x����t�){ OH�����+(E��A&�N�������XT��o��"�XC����'���)}�J�z�p� ����~5�}�^����+�6����w��c��Q�|�Lp�d�H��}�(�.|����k��c4^�����"�����Z?ȕ ��a<�������L�!0�39C� �Eu�����C�F�Ew�ç ;�n?�*o���B�8�bʝ���'#Rqf����M}7����]�������s2tcS{�\icTx;�\��7K���P������ʇ Z O-��~�������c>"��?��������P�����E��O�8��@�8��G��Q�g�a�Վ���󁶠��䧘��_%#r�>�����1�z�a���eb��qcP��ѵ��n���#L��� =��׀t� L�7�`�����V����A{�C:�g���e@�����w1 Xp�3�c3�ġ�������p��M"'-�@n4���fG���B3�DJ�8[Jo�ߐ���gK)ƛ��$���� �������8�3�����+���� �����6�ʻ���� ���S�kI�*KZlT _`�������?��K�����QK�d���������B`�s}�>���`������*�>��,*@J�d�oF*�����弝��O}�k��s��]��y�ߘ�������c1G�V���<=�7��7����6��q�PT��tXԀ�!9*4�4Tހ���3XΛex�46�������Y��D ����� ����BdemDa����\�_l,����G�/���֌7���Y�](�xTt^%�GE�����4�}bT����ڹ�����;��Y)���B�Q��u��>J/J ���⮶.�XԄ��j�ݳ������+E��d ���r�5�_D�����1 ���o�� �B�x�΢�#����<��W�����8���R6�@���g�M�.��� dr�D��>(otU��@�x=��~v���2� ӣ�d�oBd�����3�eO�6�㣷����������ݜ�6��6Y��Qz`����S��{���\P��~z m5{J/L��1������<�e�ͅPu���b�]�ϔ��������'�������f�b� Zpw��c`"��i���BD@:)ִ�:�]��h���v�E��w���T�l�������P����"Ju�}��وV ��J��G6��. J/�Qgl߭�e�����@�z�Zev2u����)]կ���������7x�������s�M�-<ɯ�c��r��v�����@��$�ޮ}lk���a����'����>x��O\�Z������Fu>������ck#��&:��`�$��ai�>2Δ����l���oF[h�������lE�ܺ�Π���k:)���`������� $[6�����9�����kOw�\|�����8}������ބ:��񶐕��������I�A1/���=�2[�,�!��.}gN#�u����b���� ~���������݊��}34q�����d�E��L��������c��$���"�[q�U�硬g^��%B ��z���r�p�������J�ru%v\h�����1Y�ne`������ǥ:g����pQM~�^��Xi� ��`S�:V2������9.�P���V������?B�k�� ��������AEvw%�_�9C�Q����wKekP�ؠ�\������;Io d�{ ߞo�c1eP�����\� `����E=���@K<�Y��������eڼ�J����w����{av�F�'�M�@��������������/J��+9p����|]���������Iw &`���8���&�M�hg���[�{�������Xj���%��Ӓ�������������������$��(�����ʹN�������<>�I���RY�����K2�NPlL�ɀ�)��&e��������B+ь����(������������������� � �JTx����_?EZ� }@���� 6�U���뙢ط�z��dWI��n` D����噥�[��uV��"�G&�����Ú����2�g�}&m���������������������?ċ���"����Om#�������������������������� ��{���������������������ON��"S�X���Ne��ysQ���@�������������Fn��Vg�����dX�~nj����������������������]J�<�K]:����FW���b�������62����������=��5f����JKw����bf�X������������������������55��~J �%^�������:�-�QIE��P��v�nZum� z � ~ə ���� ���ة����;�f��\v�������g�8�1��f2�������������������������4;�V���ǔ�)�������������������9���1\������������������������������c��v�/'Ƞ�w������������������$�4�R-��t����������������������������������� e�6�/�ġ �̕Ecy�J���u�B���<�W�ַ~�w[B1L۲�-JS΂�{���΃�������������������������������������������A��20�c#���������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������@���� 0!1@AP"#2Q`$3V�%45a6�FRUq����� ������^7ׅ,$n��������+��F�`��2X'��0vM��p�L=�������5��8������u�p~���.�`r�����\����O��,ư�0oS ��_�M�����l���4�kv\JSd���x���SW�<��Ae�IX����������$I���w�:S���y���›R��9�Q[���,�5�;�@]�%���u�@ *ro�lbI �� ��+���%m:�͇ZV�����u�̉����θau<�fc�.����{�4Ա� �Q����*�Sm��8\ujqs]{kN���)qO�y�_*dJ�b�7���yQqI&9�ԌK!�M}�R�;�������S�T���1���i[U�ɵz�]��U)V�S6���3$K{��ߊ<�(� E]Զ[ǼENg�����'�\?#)Dkf��J���o��v���'�%ƞ�&K�u��!��b�35LX�Ϸ��63$K�a�;�9>,R��W��3�3� d�JeTYE.Mϧ��-�o�j3+y��y^�c�������VO�9NV\nd�1 ��!͕_)a�v;����թ�M�lWR1��)El��P;��yوÏ�u 3�k�5Pr6<�⒲l�!˞*��u־�n�!�l:����UNW ��%��Chx8vL'��X�@��*��)���̮��ˍ��� ����D-M�+J�U�kvK����+�x8��cY������?�Ԡ��~3mo��|�u@[XeY�C�\Kp�x8�oC�C�&����N�~3-H���� ��MX�s�u<`���~"WL��$8ξ��3���a�)|:@�m�\���^�`�@ҷ)�5p+��6���p�%i)P M���ngc�����#0Aruz���RL+xSS?���ʮ}()#�t��mˇ!��0}}y����<�e� �-ή�Ԩ��X������ MF���ԙ~l L.3���}�V뽺�v������멬��Nl�)�2����^�Iq��a��M��qG��T�����c3#������3U�Ǎ���}��לS�|qa��ڃ�+���-��2�f����/��bz��ڐ�� �ݼ[2�ç����k�X�2�* �Z�d���J�G����M*9W���s{��w���T��x��y,�in�O�v��]���n����P�$��JB@=4�OTI�n��e�22a\����q�d���%�$��(���:���: /*�K[PR�fr\nڙdN���F�n�$�4��[�� U�zƶ����� �mʋ���,�ao�u 3�z� �x��Kn����\[��VFmbE;�_U��&V�Gg�]L�۪&#n%�$ɯ��dG���D�TI=�%+AB�Ru#��b4�1�»x�cs�YzڙJG��f��Il���d�eF'T� iA��T���uC�$����Y��H?����[!G`}���ͪ� �纤Hv\������j�Ex�K���!���OiƸ�Yj�+u-<���'q����uN�*�r\��+�]���<�wOZ.fp�ێ��,-*)V?j-kÊ#�`�r��dV����(�ݽBk�����G�ƛk�QmUڗe��Z���f}|����8�8��a���i��3'J�����~G_�^���d�8w������ R�`(�~�.��u���l�s+g�bv���W���lGc}��u���afE~1�Ue������Z�0�8�=e�� f@/�jqEKQQ�J���oN��J���W5~M>$6�Lt�;$ʳ{���^��6�{����v6���ķܰg�V�cnn �~z�x�«�,2�u�?cE+Ș�H؎�%�Za�)���X>uW�Tz�Nyo����s���FQƤ��$��*�&�LLXL)�1�" L��eO��ɟ�9=���:t��Z���c��Ž���Y?�ӭV�wv�~,Y��r�ۗ�|�y��GaF�����C�����.�+� ���v1���fήJ�����]�S��T��B��n5sW}y�$��~z�'�c ��8 ��� ,! �p��VN�S��N�N�q��y8z˱�A��4��*��'������2n<�s���^ǧ˭P�Jޮɏ�U�G�L�J�*#��<�V��t7�8����TĜ>��i}K%,���)[��z�21z ?�N�i�n1?T�I�R#��m-�����������������1����lA�`��fT5+��ܐ�c�q՝��ʐ��,���3�f2U�եmab��#ŠdQ�y>\��)�SLY����w#��.���ʑ�f��� ,"+�w�~�N�'�c�O�3F�������N<���)j��&��,-� �љ���֊�_�zS���TǦ����w�>��?�������n��U仆�V���e�����0���$�C�d���rP �m�׈e�Xm�Vu� �L��.�bֹ��� �[Դaզ���*��\y�8�Է:�Ez\�0�Kq�C b��̘��cө���Q��=0Y��s�N��S.����3.���O�o:���#���v7�[#߫ ��5�܎�L���Er4���9n��COWlG�^��0k�%<���ZB���aB_���������'=��{i�v�l�$�uC���mƎҝ{�c㱼�y]���W�i ��ߧc��m�H� m�"�"�����;Y�ߝ�Z�Ǔ�����:S#��|}�y�,/k�Ld� TA�(�AI$+I3��;Y*���Z��}|��ӧO��d�v��..#:n��f>�>���ȶI�TX��� 8��y����"d�R�|�)0���=���n4��6ⲑ�+��r<�O�܂~zh�z����7ܓ�HH�Ga롏���nCo�>������a ���~]���R���̲c?�6(�q�;5%� |�uj�~z8R�=X��I�V=�|{v�Gj\gc��q����z�؋%M�ߍ����1y��#��@f^���^�>N������#x#۹��6�Y~�?�dfPO��{��P�4��V��u1E1J �*|���%����JN��`eWu�zk M6���q t[�� ��g�G���v��WIG��u_ft����5�j�"�Y�:T��ɐ���*�;� e5���4����q$C��2d�}���� _S�L#m�Yp��O�.�C�;��c����Hi#֩%+) �Ӎ��ƲV���SYź��g |���tj��3�8���r|���V��1#;.SQ�A[���S������#���`n�+���$��$�I �P\[�@�s��(�ED�z���P��])8�G#��0B��[ى��X�II�q<��9�~[Z멜�Z�⊔IWU&A>�P~�#��dp<�?����7���c��'~���5 ��+$���lx@�M�dm��n<=e�dyX��?{�|Aef ,|n3�<~z�ƃ�uۧ�����P��Y,�ӥQ�*g�#먙R�\���;T��i,��[9Qi歉����c>]9�� ��"�c��P�� �Md?٥��If�ت�u��k��/����F��9�c*9��Ǎ:�ØF���z�n*�@|I�ށ9����N3{'��[�'ͬ�Ҳ4��#}��!�V� Fu��,�,mTIk���v C�7v���B�6k�T9��1�*l� '~��ƞF��lU��'�M ����][ΩũJ_�{�i�I�n��$����L�� j��O�dx�����kza۪��#�E��Cl����x˘�o�����V���ɞ�ljr��)�/,�߬h�L��#��^��L�ф�,íMƁe�̩�NB�L�����iL����q�}��(��q��6IçJ$�W�E$��:������=#����(�K�B����zђ <��K(�N�۫K�w��^O{!����)��H���>x�������lx�?>Պ�+�>�W���,Ly!_�D���Ō�l���Q�!�[ �S����J��1��Ɛ�Y}��b,+�Lo�x�ɓ)����=�y�oh�@�꥟/��I��ѭ=��P�y9��� �ۍYӘ�e+�p�Jnϱ?V\SO%�(�t� ���=?MR�[Ș�����d�/ ��n�l��B�7j� ��!�;ӥ�/�[-���A�>��dN�sLj ��,ɪv��=1c�.SQ�O3�U���ƀ�ܽ�E����������̻��9G�ϷD�7(�}��Ävӌ\��y�_0[w ���<΍>����a_��[0+�L��F.�޺��f�>oN�T����q;���y\��bՃ��y�jH�<|q-eɏ�_?_9+P���Hp$�����[ux�K w�Mw��N�ی'$Y2�=��q���KB��P��~�������Yul:�[<����F1�2�O���5=d����]Y�sw:���Ϯ���E��j,_Q��X��z`H1,#II ��d�wr��P˂@�ZJV����y$�\y�{}��^~���[:N����ߌ�U�������O��d�����ؾe��${p>G��3c���Ė�lʌ�� ת��[��`ϱ�-W����dg�I��ig2��� ��}s ��ؤ(%#sS@���~���3�X�nRG�~\jc3�v��ӍL��M[JB�T��s3}��j�Nʖ��W����;7���ç?=X�F=-�=����q�ߚ���#���='�c��7���ڑW�I(O+=:uxq�������������e2�zi+�kuG�R��������0�&e�n���iT^J����~\jy���p'dtG��s����O��3����9* �b#Ɋ�� p������[Bws�T�>d4�ۧs���nv�n���U���_�~,�v����ƜJ1��s�� �QIz���)�(lv8M���U=�;����56��G���s#�K���MP�=��LvyGd��}�VwWBF�'�à �?MH�U�g2�� ����!�p�7Q��j��ڴ����=��j�u��� Jn�A s���uM������e��Ɔ�Ҕ�!)�'��8Ϣ�ٔ���ޝ(��Vp���צ֖d=�IC�J�Ǡ{q������kԭ�߸���i��@K����u�|�p=..�*+����x�����z[Aqġ#s2a�Ɗ���RR�)*HRsi�~�a &f��M��P����-K�L@��Z��Xy�'x�{}��Zm+���:�)�) IJ�-i�u���� ���ܒH��'��L(7�y�GӜq���� j��� 6ߌg1�g�o���,kر���tY�?W,���p���e���f�OQS��!K�۟cҒA�|ս�j�>��=⬒��˧L[�� �߿2JaB~R��u�:��Q�] �0H~���]�7��Ƽ�I���(�}��cq '�ήET���q�?f�ab���ӥvr� �)o��-Q��_'����ᴎo��K������;��V���o��%���~OK ����*��b�f:���-ťIR��`B�5!RB@���ï�� �u �̯e\�_U�_������� g�ES��3��������QT��a�����x����U<~�c?�*�#]�MW,[8O�a�x��]�1bC|踤�P��lw5V%�)�{t�<��d��5���0i�XSU��m:��Z�┵�i�"��1�^B�-��P�hJ��&)O��*�D��c�W��vM��)����}���P��ܗ-q����\mmζZ-l@�}��a��E�6��F�@��&Sg@���ݚ�M����� ȹ 4����#p�\H����dYDo�H���"��\��..R�B�H�z_�/5˘����6��KhJR��P�mƶi�m���3��,#c�co��q�a)*P�t����R�m�k�7x�D�E�\Y�閣_X�<���~�)���c[[�BP����6�Yq���S��0����%_����;��Àv�~�| VS؇ ��'O0��F0��\���U�-�d@�����7�SJ*z��3n��y��P����O����������m�~�P�3|Y��ʉr#�C�<�G~�.,! ���bqx���h~0=��!ǫ�jy����l��O,�[B��~��|9��ٱ����Xly�#�i�B��g%�S��������tˋ���e���ې��\[d�t)��.+u�|1 ������#�~Oj����hS�%��i.�~X���I�H�m��0n���c�1uE�q��cF�RF�o���7� �O�ꮧ� ���ۛ{��ʛi5�rw?׌#Qn�TW��~?y$��m\�\o����%W� ?=>S�N@�� �Ʈ���R����N�)�r"C�:��:����� �����#��qb��Y�. �6[��2K����2u�Ǧ�HYR��Q�MV��� �G�$��Q+.>�����nNH��q�^��� ����q��mM��V��D�+�-�#*�U�̒ ���p욳��u:�������IB���m����PV@O���r[b= �� ��1U�E��_Nm�yKbN�O���U�}�the�`�|6֮P>�\2�P�V���I�D�i�P�O;�9�r�mAHG�W�S]��J*�_�G��+kP�2����Ka�Z���H�'K�x�W�MZ%�O�YD�Rc+o��?�q��Ghm��d�S�oh�\�D�|:W������UA�Qc yT�q��������~^�H��/��#p�CZ���T�I�1�ӏT����4��"�ČZ�����}��`w�#�*,ʹ�� ��0�i��課�Om�*�da��^gJ݅{���l�e9uF#T�ֲ��̲�ٞC"�q���ߍ ոޑ�o#�XZTp����@ o�8��(jd��xw�]�,f���`~��|,s��^����f�1���t��|��m�򸄭/ctr��5s��7�9Q�4�H1꠲BB@�l9@���C�����+�wp�xu�£Yc�9��?`@#�o�mH�s2��)�=��2�.�l����jg�9$�Y�S�%*L������R�Y������7Z���,*=�䷘$�������arm�o�ϰ���UW.|�r�uf����IGw�t����Zwo��~5 ��YյhO+=8fF�)�W�7�L9lM�̘·Y���֘YLf�큹�pRF���99.A �"wz��=E\Z���'a� 2��Ǚ�#;�'}�G���*��l��^"q��+2FQ� hj��kŦ��${���ޮ-�T�٭cf�|�3#~�RJ����t��$b�(R��(����r���dx� >U b�&9,>���%E\� Ά�e�$��'�q't��*�א���ެ�b��-|d���SB�O�O��$�R+�H�)�܎�K��1m`;�J�2�Y~9��O�g8=vqD`K[�F)k�[���1m޼c��n���]s�k�z$@��)!I �x՝"v��9=�ZA=`Ɠi �:�E��)`�7��vI��}d�YI�_ �o�:ob���o ���3Q��&D&�2=�� �Ά��;>�h����y.*ⅥS������Ӭ�+q&����j|UƧ�����}���J0��WW< ۋS�)jQR�j���Ư��rN)�Gű�4Ѷ(�S)Ǣ�8��i��W52���No˓� ۍ%�5brOn�L�;�n��\G����=�^U�dI���8$�&���h��'���+�(������cȁ߫k�l��S^���cƗjԌE�ꭔ��gF���Ȓ��@���}O���*;e�v�WV���YJ\�]X'5��ղ�k�F��b 6R�o՜m��i N�i�����>J����?��lPm�U��}>_Z&�KK��q�r��I�D�Չ~�q�3fL�:S�e>���E���-G���{L�6p�e,8��������QI��h��a�Xa��U�A'���ʂ���s�+טIjP�-��y�8ۈZ?J$��W�P� ��R�s�]��|�l(�ԓ��sƊi��o(��S0���Y� 8�T97.�����WiL��c�~�dxc�E|�2!�X�K�Ƙਫ਼�$((�6�~|d9u+�qd�^3�89��Y�6L�.I�����?���iI�q���9�)O/뚅����O���X��X�V��ZF[�یgQ�L��K1���RҖr@v�#��X�l��F���Нy�S�8�7�kF!A��sM���^rkp�jP�DyS$N���q���nxҍ!U�f�!eh�i�2�m����`�Y�I�9r�6� �TF���C}/�y�^���Η���5d�'��9A-��J��>{�_l+�`��A���[�'��յ�ϛ#w:݅�%��X�}�&�PSt�Q�"�-��\縵�/����$Ɨh�Xb�*�y��BS����;W�ջ_mc�����vt?2}1�;qS�d�d~u:2k5�2�R�~�z+|HE!)�Ǟl��7`��0�<�,�2*���Hl-��x�^����'_TV�gZA�'j� ^�2Ϊ��N7t�����?w�� �x1��f��Iz�C-Ȗ��K�^q�;���-W�DvT�7��8�Z�������� hK�(P:��Q- �8�n�Z���܃e貾�<�1�YT<�,�����"�6{�/ �?�͟��|1�:�#g��W�>$����d��J��d�B���=��jf[��%rE^��il:��B���x���Sּ�1հ��,�=��*�7 fcG��#q� �eh?��2�7�����,�!7x��6�n�LC�4x��},Geǝ�tC.��vS �F�43��zz\��;QYC,6����~;RYS/6���|2���5���v��T��i����������mlv��������&� �nRh^ejR�LG�f���? �ۉҬܦƩ��|��Ȱ����>3����!v��i�ʯ�>�v��オ�X3e���_1z�Kȗ\<������!�8���V��]��?b�k41�Re��T�q��mz��TiOʦ�Z��Xq���L������q"+���2ۨ��8}�&N7XU7Ap�d�X��~�׿��&4e�o�F��� �H�����O���č�c�� 懴�6���͉��+)��v;j��ݷ�� �UV�� i��� j���Y9GdÒJ1��詞�����V?h��l�����l�cGs�ځ�������y�Ac������\V3�? �� ܙg�>qH�S,�E�W�[�㺨�uch�⍸�O�}���a��>�q�6�n6�����N6�q��������N� ���! 1AQaq�0@����"2BRb�#Pr���3C`��Scst���$4D���%Td���� ?�����N����a��3��m���C���w��������xA�m�q�m����m������$����4n淿t'��C"w��zU=D�\R+w�p+Y�T�&�պ@��ƃ��3ޯ?�Aﶂ��aŘ���@-�����Q�=���9D��ռ�ѻ@��M�V��P��܅�G5�f�Y<�u=,EC)�<�Fy'�"�&�չ�X~f��l�KԆV��?�� �W�N����=(� �;���{�r����ٌ�Y���h{�١������jW����P���Tc�����X�K�r��}���w�R��%��?���E��m�� �Y�q|����\lEE4����r���}�lsI�Y������f�$�=�d�yO����p�����yBj8jU�o�/�S��?�U��*������ˍ�0�������u�q�m [�?f����a�� )Q�>����6#������� ?����0UQ����,IX���(6ڵ[�DI�MNލ�c&���υ�j\��X�R|,4��� j������T�hA�e��^���d���b<����n�� �즇�=!���3�^�`j�h�ȓr��jẕ�c�,ٞX����-����a�ﶔ���#�$��]w�O��Ӫ�1y%��L�Y<�wg#�ǝ�̗`�x�xa�t�w��»1���o7o5��>�m뭛C���Uƃߜ}�C���y1Xνm�F8�jI���]����H���ۺиE@I�i;r�8ӭ�����V�F�Շ| ��&?�3|x�B�MuS�Ge�=Ӕ�#BE5G������Y!z��_e��q�р/W>|-�Ci߇�t�1ޯќd�R3�u��g�=0 5��[?�#͏��q�cf���H��{ ?u�=?�?ǯ���}Z��z���hmΔ�BFTW�����<�q��(v� ��!��z���iW]*�J�V�z��gX֧A�q�&��/w���u�gYӘa���; �i=����g:��?2�dž6�ى�k�4�>�Pxs����}������G�9���3 ���)gG�R<>r h�$��'nc�h�P��Bj��J�ҧH� -��N1���N��?��~��}-q!=��_2hc�M��l�vY%UE�@|�v����M2�.Y[|y�"Eï��K�ZF,�ɯ?,q�?v�M 80jx�"�;�9vk�����+ ֧�� �ȺU��?�%�vcV��mA�6��Qg^M�����A}�3�nl� QRN�l8�kkn�'�����(��M�7m9و�q���%ޟ���*h$Zk"��$�9��: �?U8�Sl��,,|ɒ��xH(ѷ����Gn�/Q�4�P��G�%��Ա8�N��!� �&�7�;���eKM7�4��9R/%����l�c>�x;������>��C�:�����t��h?aKX�bhe�ᜋ^�$�Iհ �hr7%F$�E��Fd���t��5���+�(M6�t����Ü�UU|zW�=a�Ts�Tg������dqP�Q����b'�m���1{|Y����X�N��b �P~��F^F:����k6�"�j!�� �I�r�`��1&�-$�Bevk:y���#y�w��I0��x��=D�4��tU���P�ZH��ڠ底taP��6����b>�xa�����Q�#� WeF��ŮNj�p�J* mQ�N�����*I�-*�ȩ�F�g�3 �5��V�ʊ�ɮ�a��5F���O@{���NX��?����H�]3��1�Ri_u��������ѕ�� ����0��� F��~��:60�p�͈�S��qX#a�5>���`�o&+�<2�D����: �������ڝ�$�nP���*)�N�|y�Ej�F�5ټ�e���ihy�Z �>���k�bH�a�v��h�-#���!�Po=@k̆IEN��@��}Ll?j�O������߭�ʞ���Q|A07x���wt!xf���I2?Z��<ץ�T���cU�j��]���陎Ltl �}5�ϓ��$�,��O�mˊ�;�@O��jE��j(�ا,��LX���LO���Ц�90�O �.����a��nA���7������j4 ��W��_ٓ���zW�jcB������y՗+EM�)d���N�g6�y1_x��p�$Lv�:��9�"z��p���ʙ$��^��JԼ*�ϭ����o���=x�Lj�6�J��u82�A�H�3$�ٕ@�=Vv�]�'�qEz�;I˼��)��=��ɯ���x �/�W(V���p�����$ �m�������u�����񶤑Oqˎ�T����r��㠚x�sr�GC��byp�G��1ߠ�w e�8�$⿄����/�M{*}��W�]˷.�CK\�ުx���/$�WP�w���r� |i���&�}�{�X� �>��$-��l���?-z���g����lΆ���(F���h�vS*���b���߲ڡn,|)mrH[���a�3�ר�[1��3o_�U�3�TC�$��(�=�)0�kgP���� ��u�^=��4 �WYCҸ:��vQ�ר�X�à��tk�m,�t*��^�,�}D*�� �"(�I��9R����>`�`��[~Q]�#af��i6l��8���6�:,s�s�N6�j"�A4���IuQ��6E,�GnH��zS�HO�uk�5$�I�4��ؤ�Q9�@��C����wp��BGv[]�u�Ov����0I4���\��y�����Q�Ѹ��~>Z��8�T��a��q�ޣ;z��a���/��S��I:�ܫ_�|������>=Z����8:�S��U�I�J��"IY���8%b8���H��:�QO�6�;7�I�S��J��ҌAά3��>c���E+&jf$eC+�z�;��V����� �r���ʺ������my�e���aQ�f&��6�ND���.:��NT�vm�<- u���ǝ\MvZY�N�NT��-A�>jr!S��n�O 1�3�Ns�%�3D@���`������ܟ 1�^c<���� �a�ɽ�̲�Xë#�w�|y�cW�=�9I*H8�p�^(4���՗�k��arOcW�tO�\�ƍR��8����'�K���I�Q�����?5�>[�}��yU�ײ -h��=��% q�ThG�2�)���"ו3]�!kB��*p�FDl�A���,�eEi�H�f�Ps�����5�H:�Փ~�H�0Dت�D�I����h�F3�������c��2���E��9�H��5�zԑ�ʚ�i�X�=:m�xg�hd(�v����׊�9iS��O��d@0ڽ���:�p�5�h-��t�&���X�q�ӕ,��ie�|���7A�2���O%P��E��htj��Y1��w�Ѓ!����  ���� ࢽ��My�7�\�a�@�ţ�J ��4�Ȼ�F�@o�̒?4�wx��)��]�P��~�����u�����5�����7X ��9��^ܩ�U;Iꭆ 5 �������eK2�7(�{|��Y׎ �V��\"���Z�1� Z�����}��(�Ǝ"�1S���_�vE30>���p;� ΝD��%x�W�?W?v����o�^V�i�d��r[��/&>�~`�9Wh��y�;���R���� ;;ɮT��?����r$�g1�K����A��C��c��K��l:�'��3 c�ﳯ*"t8�~l��)���m��+U,z��`(��>yJ�?����h>��]��v��ЍG*�{`��;y]��I�T� ;c��NU�fo¾h���/$���|NS���1�S�"�H��V���T���4��uhǜ�]�v;���5�͠x��'C\�SBpl���h}�N����� A�Bx���%��ޭ�l��/����T��w�ʽ]D�=����K���ž�r㻠l4�S�O?=�k �M:� ��c�C�a�#ha���)�ѐxc�s���gP�iG���{+���x���Q���I= �� z��ԫ+ �8"�k�ñ�j=|����c ��y��CF��/���*9ж�h{ �?4�o� ��k�m�Q�N�x��;�Y��4膚�a�w?�6�>�e]�����Q�r�:����g�,i"�����ԩA��*M�<�G��b�if��l^M��5�� �Ҩ�{����6J��ZJ�����P�*�����Y���ݛu�_4�9�I8�7���������,^ToR���m4�H��?�N�S�ѕw��/S��甍�@�9H�S�T��t�ƻ���ʒU��*{Xs�@����f������֒Li�K{H�w^���������Ϥm�tq���s� ���ք��f:��o~s��g�r��ט� �S�ѱC�e]�x���a��) ���(b-$(�j>�7q�B?ӕ�F��hV25r[7 Y� }L�R��}����*sg+��x�r�2�U=�*'WS��ZDW]�WǞ�<��叓���{�$�9Ou4��y�90-�1�'*D`�c�^o?(�9��u���ݐ��'PI&� f�Jݮ�������:wS����jfP1F:X �H�9dԯ����˝[�_54 �}*;@�ܨ�� ð�yn�T���?�ןd�#���4rG�ͨ��H�1�|-#���Mr�S3��G�3�����)�.᧏3v�z֑��r����$G"�`j �1t��x0<Ɔ�Wh6�y�6��,œ�Ga��gA����y��b��)���h�D��ß�_�m��ü �gG;��e�v��ݝ�nQ� ��C����-�*��o���y�a��M��I�>�<���]obD��"�:���G�A��-\%LT�8���c�)��+y76���o�Q�#*{�(F�⽕�y����=���rW�\p���۩�c���A���^e6��K������ʐ�cVf5$�'->���ՉN"���F�"�UQ@�f��Gb~��#�&�M=��8�ט�JNu9��D��[̤�s�o�~������� G��9T�tW^g5y$b��Y'��س�Ǵ�=��U-2 #�MC�t(�i� �lj�@Q 5�̣i�*�O����s�x�K�f��}\��M{E�V�{�υ��Ƈ�����);�H����I��fe�Lȣr�2��>��W��I�Ȃ6������i��k�� �5�YOxȺ����>��Y�f5'��|��H+��98pj�n�.O�y�������jY��~��i�w'������l�;�s�2��Y��:'lg�ꥴ)o#'Sa�a�K��Z� �m��}�`169�n���"���x��I ��*+� }F<��cГ���F�P�������ֹ*�PqX�x۩��,� ��N�� �4<-����%����:��7����W���u�`����� $�?�I��&����o��o��`v�>��P��"��l���4��5'�Z�gE���8���?��[�X�7(��.Q�-��*���ތL@̲����v��.5���[��=�t\+�CNܛ��,g�SQnH����}*F�G16���&:�t��4ُ"A��̣��$�b �|����#rs��a�����T�� ]�<�j��B�S�('$�ɻ� �wP;�/�n��?�ݜ��x�F��yUn�~mL*-�������Xf�wd^�a�}��f�,=t�׵i�.2/wpN�Ep8�OР���•��R�FJ� 55TZ��T �ɭ�<��]��/�0�r�@�f��V��V����Nz�G��^���7hZi����k��3�,kN�e|�vg�1{9]_i��X5y7� 8e]�U����'�-2,���e"����]ot�I��Y_��n�(JҼ��1�O ]bXc���Nu�No��pS���Q_���_�?i�~�x h5d'�(qw52] ��'ޤ�q��o1�R!���`ywy�A4u���h<קy���\[~�4�\ X�Wt/� 6�����n�F�a8��f���z �3$�t(���q��q�x��^�XWeN'p<-v�!�{�(>ӽDP7��ո0�y)�e$ٕv�Ih'Q�EA�m*�H��RI��=:��� ���4牢) �%_iN�ݧ�l]� �Nt���G��H�L��� ɱ�g<���1V�,�J~�ٹ�"K��Q�� 9�HS�9�?@��k����r�;we݁�]I�!{ �@�G�[�"��`���J:�n]�{�cA�E����V��ʆ���#��U9�6����j�#Y�m\��q�e4h�B�7��C�������d<�?J����1g:ٳ���=Y���D�p�ц� ׈ǔ��1�]26؜oS�'��9�V�FVu�P�h�9�xc�oq�X��p�o�5��Ա5$�9W�V(�[Ak�aY錎qf;�'�[�|���b�6�Ck��)��#a#a˙��8���=äh�4��2��C��4tm^ �n'c����]GQ$[Wҿ��i���vN�{Fu ��1�gx��1┷���N�m��{j-,��x�� Ūm�ЧS�[�s���Gna���䑴�� x�p 8<������97�Q���ϴ�v�aϚG��Rt�Һ׈�f^\r��WH�JU�7Z���y)�vg=����n��4�_)y��D'y�6�]�c�5̪��\� �PF�k����&�c;��cq�$~T�7j ���nç]�<�g ":�to�t}�159�<�/�8������m�b�K#g'I'.W������6��I/��>v��\�MN��g���m�A�yQL�4u�Lj�j9��#44�t��l^�}L����n��R��!��t��±]��r��h6ٍ>�yҏ�N��fU�� ���� Fm@�8}�/u��jb9������he:A�y�ծw��GpΧh�5����l}�3p468��)U��d��c����;Us/�֔�YX�1�O2��uq�s��`hwg�r~�{ R��mhN��؎*q 42�*th��>�#���E����#��Hv�O����q�}������6�e��\�,Wk�#���X��b>��p}�դ��3���T5��†��6��[��@��P�y*n��|'f�֧>�lư΂�̺����SU�'*�q�p�_S�����M�� '��c�6������m�� ySʨ;M��r���Ƌ�m�Kxo,���Gm�P��A�G�:��i��w�9�}M(�^�V��$ǒ�ѽ�9���|���� �a����J�SQ�a���r�B;����}���ٻ֢�2�%U���c�#�g���N�a�ݕ�'�v�[�OY'��3L�3�;,p�]@�S��{ls��X�'���c�jw��k'a�.��}�}&�� �dP�*�bK=ɍ!����;3n�gΊU�ߴmt�'*{,=SzfD� A��ko~�G�aoq�_mi}#�m�������P�Xhύ�����mxǍ�΂���巿zf��Q���c���|kc�����?���W��Y�$���_Lv����l߶��c���`?����l�j�ݲˏ!V��6����U�Ђ(A���4y)H���p�Z_�x��>���e���R��$�/�`^'3qˏ�-&Q�=?��CFVR �D�fV�9��{�8g�������n�h�(P"��6�[�D���< E�����~0<@�`�G�6����Hг�cc�� �c�K.5��D��d�B���`?�XQ��2��ٿyqo&+�1^� DW�0�ꊩ���G�#��Q�nL3��c���������/��x ��1�1�[y�x�პCW��C�c�UĨ80�m�e�4.{�m��u���I=��f�����0QRls9���f���������9���~f�����Ǩ��a�"@�8���ȁ�Q����#c�ic������G��$���G���r/$W�(��W���V�"��m�7�[m�A�m����bo��D� j����۳� l���^�k�h׽����� ��#� iXn�v��eT�k�a�^Y�4�BN���ĕ���0������� !01@Q"2AaPq3BR�������?�����@4�Q�����T3,���㺠�W�[=JK�Ϟ���2�r^7��vc�:�9 �E�ߴ�w�S#d���Ix��u��:��Hp��9E!�� V 2;73|F��9Y���*ʬ�F��D����u&���y؟��^EA��A��(ɩ���^��GV:ݜDy�`��Jr29ܾ�㝉��[���E;Fzx��YG��U�e�Y�C���� ����v-tx����I�sם�Ę�q��Eb�+P\ :>�i�C'�;�����k|z�رn�y]�#ǿb��Q��������w�����(�r|ӹs��[�D��2v-%��@;�8<a���[\o[ϧw��I!��*0�krs)�[�J9^��ʜ��p1)� "��/_>��o��<1����A�E�y^�C��`�x1'ܣn�p��s`l���fQ��):�l����b>�Me�jH^?�kl3(�z:���1ŠK&?Q�~�{�ٺ�h�y���/�[��V�|6��}�KbX����mn[-��7�5q�94�������dm���c^���h� X��5��<�eޘ>G���-�}�دB�ޟ� ��|�rt�M��V+�]�c?�-#ڛ��^ǂ}���Lkr���O��u�>�-D�ry� D?:ޞ�U��ǜ�7�V��?瓮�"�#���r��չģVR;�n���/_� ؉v�ݶe5d�b9��/O��009�G���5n�W����JpA�*�r9�>�1��.[t���s�F���nQ� V 77R�]�ɫ8����_0<՜�IF�u(v��4��F�k�3��E)��N:��yڮe��P�`�1}�$WS��J�SQ�N�j��ٺ��޵�#l���ј(�5=��5�lǏmoW�v-�1����v,W�mn��߀$x�<����v�j(����c]��@#��1������Ǔ���o'��u+����;G�#�޸��v-lη��/(`i⣍Pm^����ԯ̾9Z��F��������n��1��� ��]�[��)�'�������:�֪�W��FC����� �B9،!?���]��V��A�Վ�M��b�w��G F>_DȬ0¤�#�QR�[V��kz���m�w�"��9ZG�7'[��=�Q����j8R?�zf�\a�=��O�U����*oB�A�|G���2�54 �p��.w7� �� ���&������ξxGHp� B%��$g�����t�Џ򤵍z���HN�u�Я�-�'4��0���;_���3������� !01"@AQa2Pq#3BR�������?����ʩca��en��^��8���<�u#��m*08r��y�N"�<�Ѳ0��@\�p��� �����Kv�D��J8�Fҽ� �f�Y��-m�ybX�NP����}�!*8t(�OqѢ��Q�wW�K��ZD��Δ^e��!� ��B�K��p~�����e*l}z#9ң�k���q#�Ft�o��S�R����-�w�!�S���Ӥß|M�l޶V��!eˈ�8Y���c�ЮM2��tk���� ������J�fS����Ö*i/2�����n]�k�\���|4yX�8��U�P.���Ы[���l��@"�t�<������5�lF���vU�����W��W��;�b�cД^6[#7@vU�xgZv��F�6��Q,K�v��� �+Ъ��n��Ǣ��Ft���8��0��c�@�!�Zq s�v�t�;#](B��-�nῃ~���3g������5�J�%���O������n�kB�ĺ�.r��+���#�N$?�q�/�s�6��p��a����a��J/��M�8��6�ܰ"�*������ɗud"\w���aT(����[��F��U՛����RT�b���n�*��6���O��SJ�.�ij<�v�MT��R\c��5l�sZB>F��<7�;EA��{��E���Ö��1U/�#��d1�a�n.1ě����0�ʾR�h��|�R��Ao�3�m3 ��%�� ���28Q�� ��y��φ���H�To�7�lW>����#i`�q���c����a��� �m,B�-j����݋�'mR1Ήt�>��V��p���s�0IbI�C.���1R�ea�����]H�6�����������4B>��o��](��$B���m�����a�!=���?�B� K�Ǿ+�Ծ"�n���K��*��+��[T#�{�E�J�S����Q�����s�5�:�U�\wĐ�f�3����܆&�)�����I���Ԇw��E T�lrTf6Q|R�h:��[K�� �z��c֧�G�C��%\��_�a��84��HcO�bi��ؖV��7H �)*ģK~Xhչ0��4?�0��� �E<���}3���#���u�?�� ��|g�S�6ꊤ�|�I#Hڛ� �ա��w�X��9��7���Ŀ%�SL��y6č��|�F�a 8���b���$�sק�h���b9RAu7�˨p�Č�_\*w��묦��F ����4D~�f����|(�"m���NK��i�S�>�$d7SlA��/�²����SL��|6N�}���S�˯���g��]6��; �#�.��<���q'Q�1|KQ$�����񛩶"�$r�b:���N8�w@��8$�� �AjfG|~�9F ���Y��ʺ��Bwؒ������M:I岎�G��`s�YV5����6��A �b:�W���G�q%l�����F��H���7�������Fsv7���k�� 403WebShell
403Webshell
Server IP : 88.222.243.41  /  Your IP : 216.73.216.150
Web Server : LiteSpeed
System : Linux in-mum-web1874.main-hosting.eu 5.14.0-570.21.1.el9_6.x86_64 #1 SMP PREEMPT_DYNAMIC Wed Jun 11 07:22:35 EDT 2025 x86_64
User : u862839997 ( 862839997)
PHP Version : 8.2.30
Disable Function : system, exec, shell_exec, passthru, mysql_list_dbs, ini_alter, dl, symlink, link, chgrp, leak, popen, apache_child_terminate, virtual, mb_send_mail
MySQL : OFF  |  cURL : ON  |  WGET : ON  |  Perl : OFF  |  Python : OFF  |  Sudo : OFF  |  Pkexec : OFF
Directory :  /opt/go/pkg/mod/github.com/mdlayher/socket@v0.4.1/

Upload File :
current_dir [ Writeable ] document_root [ Writeable ]

 

Command :


[ Back ]     

Current File : /opt/go/pkg/mod/github.com/mdlayher/socket@v0.4.1//conn.go
package socket

import (
	"context"
	"errors"
	"io"
	"os"
	"sync"
	"sync/atomic"
	"syscall"
	"time"

	"golang.org/x/sys/unix"
)

// Lock in an expected public interface for convenience.
var _ interface {
	io.ReadWriteCloser
	syscall.Conn
	SetDeadline(t time.Time) error
	SetReadDeadline(t time.Time) error
	SetWriteDeadline(t time.Time) error
} = &Conn{}

// A Conn is a low-level network connection which integrates with Go's runtime
// network poller to provide asynchronous I/O and deadline support.
//
// Many of a Conn's blocking methods support net.Conn deadlines as well as
// cancelation via context. Note that passing a context with a deadline set will
// override any of the previous deadlines set by calls to the SetDeadline family
// of methods.
type Conn struct {
	// Indicates whether or not Conn.Close has been called. Must be accessed
	// atomically. Atomics definitions must come first in the Conn struct.
	closed uint32

	// A unique name for the Conn which is also associated with derived file
	// descriptors such as those created by accept(2).
	name string

	// facts contains information we have determined about Conn to trigger
	// alternate behavior in certain functions.
	facts facts

	// Provides access to the underlying file registered with the runtime
	// network poller, and arbitrary raw I/O calls.
	fd *os.File
	rc syscall.RawConn
}

// facts contains facts about a Conn.
type facts struct {
	// isStream reports whether this is a streaming descriptor, as opposed to a
	// packet-based descriptor like a UDP socket.
	isStream bool

	// zeroReadIsEOF reports Whether a zero byte read indicates EOF. This is
	// false for a message based socket connection.
	zeroReadIsEOF bool
}

// A Config contains options for a Conn.
type Config struct {
	// NetNS specifies the Linux network namespace the Conn will operate in.
	// This option is unsupported on other operating systems.
	//
	// If set (non-zero), Conn will enter the specified network namespace and an
	// error will occur in Socket if the operation fails.
	//
	// If not set (zero), a best-effort attempt will be made to enter the
	// network namespace of the calling thread: this means that any changes made
	// to the calling thread's network namespace will also be reflected in Conn.
	// If this operation fails (due to lack of permissions or because network
	// namespaces are disabled by kernel configuration), Socket will not return
	// an error, and the Conn will operate in the default network namespace of
	// the process. This enables non-privileged use of Conn in applications
	// which do not require elevated privileges.
	//
	// Entering a network namespace is a privileged operation (root or
	// CAP_SYS_ADMIN are required), and most applications should leave this set
	// to 0.
	NetNS int
}

// High-level methods which provide convenience over raw system calls.

// Close closes the underlying file descriptor for the Conn, which also causes
// all in-flight I/O operations to immediately unblock and return errors. Any
// subsequent uses of Conn will result in EBADF.
func (c *Conn) Close() error {
	// The caller has expressed an intent to close the socket, so immediately
	// increment s.closed to force further calls to result in EBADF before also
	// closing the file descriptor to unblock any outstanding operations.
	//
	// Because other operations simply check for s.closed != 0, we will permit
	// double Close, which would increment s.closed beyond 1.
	if atomic.AddUint32(&c.closed, 1) != 1 {
		// Multiple Close calls.
		return nil
	}

	return os.NewSyscallError("close", c.fd.Close())
}

// CloseRead shuts down the reading side of the Conn. Most callers should just
// use Close.
func (c *Conn) CloseRead() error { return c.Shutdown(unix.SHUT_RD) }

// CloseWrite shuts down the writing side of the Conn. Most callers should just
// use Close.
func (c *Conn) CloseWrite() error { return c.Shutdown(unix.SHUT_WR) }

// Read reads directly from the underlying file descriptor.
func (c *Conn) Read(b []byte) (int, error) { return c.fd.Read(b) }

// ReadContext reads from the underlying file descriptor with added support for
// context cancelation.
func (c *Conn) ReadContext(ctx context.Context, b []byte) (int, error) {
	if c.facts.isStream && len(b) > maxRW {
		b = b[:maxRW]
	}

	n, err := readT(c, ctx, "read", func(fd int) (int, error) {
		return unix.Read(fd, b)
	})
	if n == 0 && err == nil && c.facts.zeroReadIsEOF {
		return 0, io.EOF
	}

	return n, os.NewSyscallError("read", err)
}

// Write writes directly to the underlying file descriptor.
func (c *Conn) Write(b []byte) (int, error) { return c.fd.Write(b) }

// WriteContext writes to the underlying file descriptor with added support for
// context cancelation.
func (c *Conn) WriteContext(ctx context.Context, b []byte) (int, error) {
	var (
		n, nn int
		err   error
	)

	doErr := c.write(ctx, "write", func(fd int) error {
		max := len(b)
		if c.facts.isStream && max-nn > maxRW {
			max = nn + maxRW
		}

		n, err = unix.Write(fd, b[nn:max])
		if n > 0 {
			nn += n
		}
		if nn == len(b) {
			return err
		}
		if n == 0 && err == nil {
			err = io.ErrUnexpectedEOF
			return nil
		}

		return err
	})
	if doErr != nil {
		return 0, doErr
	}

	return nn, os.NewSyscallError("write", err)
}

// SetDeadline sets both the read and write deadlines associated with the Conn.
func (c *Conn) SetDeadline(t time.Time) error { return c.fd.SetDeadline(t) }

// SetReadDeadline sets the read deadline associated with the Conn.
func (c *Conn) SetReadDeadline(t time.Time) error { return c.fd.SetReadDeadline(t) }

// SetWriteDeadline sets the write deadline associated with the Conn.
func (c *Conn) SetWriteDeadline(t time.Time) error { return c.fd.SetWriteDeadline(t) }

// ReadBuffer gets the size of the operating system's receive buffer associated
// with the Conn.
func (c *Conn) ReadBuffer() (int, error) {
	return c.GetsockoptInt(unix.SOL_SOCKET, unix.SO_RCVBUF)
}

// WriteBuffer gets the size of the operating system's transmit buffer
// associated with the Conn.
func (c *Conn) WriteBuffer() (int, error) {
	return c.GetsockoptInt(unix.SOL_SOCKET, unix.SO_SNDBUF)
}

// SetReadBuffer sets the size of the operating system's receive buffer
// associated with the Conn.
//
// When called with elevated privileges on Linux, the SO_RCVBUFFORCE option will
// be used to override operating system limits. Otherwise SO_RCVBUF is used
// (which obeys operating system limits).
func (c *Conn) SetReadBuffer(bytes int) error { return c.setReadBuffer(bytes) }

// SetWriteBuffer sets the size of the operating system's transmit buffer
// associated with the Conn.
//
// When called with elevated privileges on Linux, the SO_SNDBUFFORCE option will
// be used to override operating system limits. Otherwise SO_SNDBUF is used
// (which obeys operating system limits).
func (c *Conn) SetWriteBuffer(bytes int) error { return c.setWriteBuffer(bytes) }

// SyscallConn returns a raw network connection. This implements the
// syscall.Conn interface.
//
// SyscallConn is intended for advanced use cases, such as getting and setting
// arbitrary socket options using the socket's file descriptor. If possible,
// those operations should be performed using methods on Conn instead.
//
// Once invoked, it is the caller's responsibility to ensure that operations
// performed using Conn and the syscall.RawConn do not conflict with each other.
func (c *Conn) SyscallConn() (syscall.RawConn, error) {
	if atomic.LoadUint32(&c.closed) != 0 {
		return nil, os.NewSyscallError("syscallconn", unix.EBADF)
	}

	// TODO(mdlayher): mutex or similar to enforce syscall.RawConn contract of
	// FD remaining valid for duration of calls?
	return c.rc, nil
}

// Socket wraps the socket(2) system call to produce a Conn. domain, typ, and
// proto are passed directly to socket(2), and name should be a unique name for
// the socket type such as "netlink" or "vsock".
//
// The cfg parameter specifies optional configuration for the Conn. If nil, no
// additional configuration will be applied.
//
// If the operating system supports SOCK_CLOEXEC and SOCK_NONBLOCK, they are
// automatically applied to typ to mirror the standard library's socket flag
// behaviors.
func Socket(domain, typ, proto int, name string, cfg *Config) (*Conn, error) {
	if cfg == nil {
		cfg = &Config{}
	}

	if cfg.NetNS == 0 {
		// Non-Linux or no network namespace.
		return socket(domain, typ, proto, name)
	}

	// Linux only: create Conn in the specified network namespace.
	return withNetNS(cfg.NetNS, func() (*Conn, error) {
		return socket(domain, typ, proto, name)
	})
}

// socket is the internal, cross-platform entry point for socket(2).
func socket(domain, typ, proto int, name string) (*Conn, error) {
	var (
		fd  int
		err error
	)

	for {
		fd, err = unix.Socket(domain, typ|socketFlags, proto)
		switch {
		case err == nil:
			// Some OSes already set CLOEXEC with typ.
			if !flagCLOEXEC {
				unix.CloseOnExec(fd)
			}

			// No error, prepare the Conn.
			return New(fd, name)
		case !ready(err):
			// System call interrupted or not ready, try again.
			continue
		case err == unix.EINVAL, err == unix.EPROTONOSUPPORT:
			// On Linux, SOCK_NONBLOCK and SOCK_CLOEXEC were introduced in
			// 2.6.27. On FreeBSD, both flags were introduced in FreeBSD 10.
			// EINVAL and EPROTONOSUPPORT check for earlier versions of these
			// OSes respectively.
			//
			// Mirror what the standard library does when creating file
			// descriptors: avoid racing a fork/exec with the creation of new
			// file descriptors, so that child processes do not inherit socket
			// file descriptors unexpectedly.
			//
			// For a more thorough explanation, see similar work in the Go tree:
			// func sysSocket in net/sock_cloexec.go, as well as the detailed
			// comment in syscall/exec_unix.go.
			syscall.ForkLock.RLock()
			fd, err = unix.Socket(domain, typ, proto)
			if err != nil {
				syscall.ForkLock.RUnlock()
				return nil, os.NewSyscallError("socket", err)
			}
			unix.CloseOnExec(fd)
			syscall.ForkLock.RUnlock()

			return New(fd, name)
		default:
			// Unhandled error.
			return nil, os.NewSyscallError("socket", err)
		}
	}
}

// FileConn returns a copy of the network connection corresponding to the open
// file. It is the caller's responsibility to close the file when finished.
// Closing the Conn does not affect the File, and closing the File does not
// affect the Conn.
func FileConn(f *os.File, name string) (*Conn, error) {
	// First we'll try to do fctnl(2) with F_DUPFD_CLOEXEC because we can dup
	// the file descriptor and set the flag in one syscall.
	fd, err := unix.FcntlInt(f.Fd(), unix.F_DUPFD_CLOEXEC, 0)
	switch err {
	case nil:
		// OK, ready to set up non-blocking I/O.
		return New(fd, name)
	case unix.EINVAL:
		// The kernel rejected our fcntl(2), fall back to separate dup(2) and
		// setting close on exec.
		//
		// Mirror what the standard library does when creating file descriptors:
		// avoid racing a fork/exec with the creation of new file descriptors,
		// so that child processes do not inherit socket file descriptors
		// unexpectedly.
		syscall.ForkLock.RLock()
		fd, err := unix.Dup(fd)
		if err != nil {
			syscall.ForkLock.RUnlock()
			return nil, os.NewSyscallError("dup", err)
		}
		unix.CloseOnExec(fd)
		syscall.ForkLock.RUnlock()

		return New(fd, name)
	default:
		// Any other errors.
		return nil, os.NewSyscallError("fcntl", err)
	}
}

// New wraps an existing file descriptor to create a Conn. name should be a
// unique name for the socket type such as "netlink" or "vsock".
//
// Most callers should use Socket or FileConn to construct a Conn. New is
// intended for integrating with specific system calls which provide a file
// descriptor that supports asynchronous I/O. The file descriptor is immediately
// set to nonblocking mode and registered with Go's runtime network poller for
// future I/O operations.
//
// Unlike FileConn, New does not duplicate the existing file descriptor in any
// way. The returned Conn takes ownership of the underlying file descriptor.
func New(fd int, name string) (*Conn, error) {
	// All Conn I/O is nonblocking for integration with Go's runtime network
	// poller. Depending on the OS this might already be set but it can't hurt
	// to set it again.
	if err := unix.SetNonblock(fd, true); err != nil {
		return nil, os.NewSyscallError("setnonblock", err)
	}

	// os.NewFile registers the non-blocking file descriptor with the runtime
	// poller, which is then used for most subsequent operations except those
	// that require raw I/O via SyscallConn.
	//
	// See also: https://golang.org/pkg/os/#NewFile
	f := os.NewFile(uintptr(fd), name)
	rc, err := f.SyscallConn()
	if err != nil {
		return nil, err
	}

	c := &Conn{
		name: name,
		fd:   f,
		rc:   rc,
	}

	// Probe the file descriptor for socket settings.
	sotype, err := c.GetsockoptInt(unix.SOL_SOCKET, unix.SO_TYPE)
	switch {
	case err == nil:
		// File is a socket, check its properties.
		c.facts = facts{
			isStream:      sotype == unix.SOCK_STREAM,
			zeroReadIsEOF: sotype != unix.SOCK_DGRAM && sotype != unix.SOCK_RAW,
		}
	case errors.Is(err, unix.ENOTSOCK):
		// File is not a socket, treat it as a regular file.
		c.facts = facts{
			isStream:      true,
			zeroReadIsEOF: true,
		}
	default:
		return nil, err
	}

	return c, nil
}

// Low-level methods which provide raw system call access.

// Accept wraps accept(2) or accept4(2) depending on the operating system, but
// returns a Conn for the accepted connection rather than a raw file descriptor.
//
// If the operating system supports accept4(2) (which allows flags),
// SOCK_CLOEXEC and SOCK_NONBLOCK are automatically applied to flags to mirror
// the standard library's socket flag behaviors.
//
// If the operating system only supports accept(2) (which does not allow flags)
// and flags is not zero, an error will be returned.
//
// Accept obeys context cancelation and uses the deadline set on the context to
// cancel accepting the next connection. If a deadline is set on ctx, this
// deadline will override any previous deadlines set using SetDeadline or
// SetReadDeadline. Upon return, the read deadline is cleared.
func (c *Conn) Accept(ctx context.Context, flags int) (*Conn, unix.Sockaddr, error) {
	type ret struct {
		nfd int
		sa  unix.Sockaddr
	}

	r, err := readT(c, ctx, sysAccept, func(fd int) (ret, error) {
		// Either accept(2) or accept4(2) depending on the OS.
		nfd, sa, err := accept(fd, flags|socketFlags)
		return ret{nfd, sa}, err
	})
	if err != nil {
		// internal/poll, context error, or user function error.
		return nil, nil, err
	}

	// Successfully accepted a connection, wrap it in a Conn for use by the
	// caller.
	ac, err := New(r.nfd, c.name)
	if err != nil {
		return nil, nil, err
	}

	return ac, r.sa, nil
}

// Bind wraps bind(2).
func (c *Conn) Bind(sa unix.Sockaddr) error {
	return c.control(context.Background(), "bind", func(fd int) error {
		return unix.Bind(fd, sa)
	})
}

// Connect wraps connect(2). In order to verify that the underlying socket is
// connected to a remote peer, Connect calls getpeername(2) and returns the
// unix.Sockaddr from that call.
//
// Connect obeys context cancelation and uses the deadline set on the context to
// cancel connecting to a remote peer. If a deadline is set on ctx, this
// deadline will override any previous deadlines set using SetDeadline or
// SetWriteDeadline. Upon return, the write deadline is cleared.
func (c *Conn) Connect(ctx context.Context, sa unix.Sockaddr) (unix.Sockaddr, error) {
	const op = "connect"

	// TODO(mdlayher): it would seem that trying to connect to unbound vsock
	// listeners by calling Connect multiple times results in ECONNRESET for the
	// first and nil error for subsequent calls. Do we need to memoize the
	// error? Check what the stdlib behavior is.

	var (
		// Track progress between invocations of the write closure. We don't
		// have an explicit WaitWrite call like internal/poll does, so we have
		// to wait until the runtime calls the closure again to indicate we can
		// write.
		progress uint32

		// Capture closure sockaddr and error.
		rsa unix.Sockaddr
		err error
	)

	doErr := c.write(ctx, op, func(fd int) error {
		if atomic.AddUint32(&progress, 1) == 1 {
			// First call: initiate connect.
			return unix.Connect(fd, sa)
		}

		// Subsequent calls: the runtime network poller indicates fd is
		// writable. Check for errno.
		errno, gerr := c.GetsockoptInt(unix.SOL_SOCKET, unix.SO_ERROR)
		if gerr != nil {
			return gerr
		}
		if errno != 0 {
			// Connection is still not ready or failed. If errno indicates
			// the socket is not ready, we will wait for the next write
			// event. Otherwise we propagate this errno back to the as a
			// permanent error.
			uerr := unix.Errno(errno)
			err = uerr
			return uerr
		}

		// According to internal/poll, it's possible for the runtime network
		// poller to spuriously wake us and return errno 0 for SO_ERROR.
		// Make sure we are actually connected to a peer.
		peer, err := c.Getpeername()
		if err != nil {
			// internal/poll unconditionally goes back to WaitWrite.
			// Synthesize an error that will do the same for us.
			return unix.EAGAIN
		}

		// Connection complete.
		rsa = peer
		return nil
	})
	if doErr != nil {
		// internal/poll or context error.
		return nil, doErr
	}

	if err == unix.EISCONN {
		// TODO(mdlayher): is this block obsolete with the addition of the
		// getsockopt SO_ERROR check above?
		//
		// EISCONN is reported if the socket is already established and should
		// not be treated as an error.
		//  - Darwin reports this for at least TCP sockets
		//  - Linux reports this for at least AF_VSOCK sockets
		return rsa, nil
	}

	return rsa, os.NewSyscallError(op, err)
}

// Getsockname wraps getsockname(2).
func (c *Conn) Getsockname() (unix.Sockaddr, error) {
	return controlT(c, context.Background(), "getsockname", unix.Getsockname)
}

// Getpeername wraps getpeername(2).
func (c *Conn) Getpeername() (unix.Sockaddr, error) {
	return controlT(c, context.Background(), "getpeername", unix.Getpeername)
}

// GetsockoptInt wraps getsockopt(2) for integer values.
func (c *Conn) GetsockoptInt(level, opt int) (int, error) {
	return controlT(c, context.Background(), "getsockopt", func(fd int) (int, error) {
		return unix.GetsockoptInt(fd, level, opt)
	})
}

// Listen wraps listen(2).
func (c *Conn) Listen(n int) error {
	return c.control(context.Background(), "listen", func(fd int) error {
		return unix.Listen(fd, n)
	})
}

// Recvmsg wraps recvmsg(2).
func (c *Conn) Recvmsg(ctx context.Context, p, oob []byte, flags int) (int, int, int, unix.Sockaddr, error) {
	type ret struct {
		n, oobn, recvflags int
		from               unix.Sockaddr
	}

	r, err := readT(c, ctx, "recvmsg", func(fd int) (ret, error) {
		n, oobn, recvflags, from, err := unix.Recvmsg(fd, p, oob, flags)
		return ret{n, oobn, recvflags, from}, err
	})
	if r.n == 0 && err == nil && c.facts.zeroReadIsEOF {
		return 0, 0, 0, nil, io.EOF
	}

	return r.n, r.oobn, r.recvflags, r.from, err
}

// Recvfrom wraps recvfrom(2).
func (c *Conn) Recvfrom(ctx context.Context, p []byte, flags int) (int, unix.Sockaddr, error) {
	type ret struct {
		n    int
		addr unix.Sockaddr
	}

	out, err := readT(c, ctx, "recvfrom", func(fd int) (ret, error) {
		n, addr, err := unix.Recvfrom(fd, p, flags)
		return ret{n, addr}, err
	})
	if out.n == 0 && err == nil && c.facts.zeroReadIsEOF {
		return 0, nil, io.EOF
	}

	return out.n, out.addr, err
}

// Sendmsg wraps sendmsg(2).
func (c *Conn) Sendmsg(ctx context.Context, p, oob []byte, to unix.Sockaddr, flags int) (int, error) {
	return writeT(c, ctx, "sendmsg", func(fd int) (int, error) {
		return unix.SendmsgN(fd, p, oob, to, flags)
	})
}

// Sendto wraps sendto(2).
func (c *Conn) Sendto(ctx context.Context, p []byte, flags int, to unix.Sockaddr) error {
	return c.write(ctx, "sendto", func(fd int) error {
		return unix.Sendto(fd, p, flags, to)
	})
}

// SetsockoptInt wraps setsockopt(2) for integer values.
func (c *Conn) SetsockoptInt(level, opt, value int) error {
	return c.control(context.Background(), "setsockopt", func(fd int) error {
		return unix.SetsockoptInt(fd, level, opt, value)
	})
}

// Shutdown wraps shutdown(2).
func (c *Conn) Shutdown(how int) error {
	return c.control(context.Background(), "shutdown", func(fd int) error {
		return unix.Shutdown(fd, how)
	})
}

// Conn low-level read/write/control functions. These functions mirror the
// syscall.RawConn APIs but the input closures return errors rather than
// booleans.

// read wraps readT to execute a function and capture its error result. This is
// a convenience wrapper for functions which don't return any extra values.
func (c *Conn) read(ctx context.Context, op string, f func(fd int) error) error {
	_, err := readT(c, ctx, op, func(fd int) (struct{}, error) {
		return struct{}{}, f(fd)
	})
	return err
}

// write executes f, a write function, against the associated file descriptor.
// op is used to create an *os.SyscallError if the file descriptor is closed.
func (c *Conn) write(ctx context.Context, op string, f func(fd int) error) error {
	_, err := writeT(c, ctx, op, func(fd int) (struct{}, error) {
		return struct{}{}, f(fd)
	})
	return err
}

// readT executes c.rc.Read for op using the input function, returning a newly
// allocated result T.
func readT[T any](c *Conn, ctx context.Context, op string, f func(fd int) (T, error)) (T, error) {
	return rwT(c, rwContext[T]{
		Context: ctx,
		Type:    read,
		Op:      op,
		Do:      f,
	})
}

// writeT executes c.rc.Write for op using the input function, returning a newly
// allocated result T.
func writeT[T any](c *Conn, ctx context.Context, op string, f func(fd int) (T, error)) (T, error) {
	return rwT(c, rwContext[T]{
		Context: ctx,
		Type:    write,
		Op:      op,
		Do:      f,
	})
}

// readWrite indicates if an operation intends to read or write.
type readWrite bool

// Possible readWrite values.
const (
	read  readWrite = false
	write readWrite = true
)

// An rwContext provides arguments to rwT.
type rwContext[T any] struct {
	// The caller's context passed for cancelation.
	Context context.Context

	// The type of an operation: read or write.
	Type readWrite

	// The name of the operation used in errors.
	Op string

	// The actual function to perform.
	Do func(fd int) (T, error)
}

// rwT executes c.rc.Read or c.rc.Write (depending on the value of rw.Type) for
// rw.Op using the input function, returning a newly allocated result T.
//
// It obeys context cancelation and the rw.Context must not be nil.
func rwT[T any](c *Conn, rw rwContext[T]) (T, error) {
	if atomic.LoadUint32(&c.closed) != 0 {
		// If the file descriptor is already closed, do nothing.
		return *new(T), os.NewSyscallError(rw.Op, unix.EBADF)
	}

	if err := rw.Context.Err(); err != nil {
		// Early exit due to context cancel.
		return *new(T), os.NewSyscallError(rw.Op, err)
	}

	var (
		// The read or write function used to access the runtime network poller.
		poll func(func(uintptr) bool) error

		// The read or write function used to set the matching deadline.
		deadline func(time.Time) error
	)

	if rw.Type == write {
		poll = c.rc.Write
		deadline = c.SetWriteDeadline
	} else {
		poll = c.rc.Read
		deadline = c.SetReadDeadline
	}

	var (
		// Whether or not the context carried a deadline we are actively using
		// for cancelation.
		setDeadline bool

		// Signals for the cancelation watcher goroutine.
		wg    sync.WaitGroup
		doneC = make(chan struct{})

		// Atomic: reports whether we have to disarm the deadline.
		//
		// TODO(mdlayher): switch back to atomic.Bool when we drop support for
		// Go 1.18.
		needDisarm int64
	)

	// On cancel, clean up the watcher.
	defer func() {
		close(doneC)
		wg.Wait()
	}()

	if d, ok := rw.Context.Deadline(); ok {
		// The context has an explicit deadline. We will use it for cancelation
		// but disarm it after poll for the next call.
		if err := deadline(d); err != nil {
			return *new(T), err
		}
		setDeadline = true
		atomic.AddInt64(&needDisarm, 1)
	} else {
		// The context does not have an explicit deadline. We have to watch for
		// cancelation so we can propagate that signal to immediately unblock
		// the runtime network poller.
		//
		// TODO(mdlayher): is it possible to detect a background context vs a
		// context with possible future cancel?
		wg.Add(1)
		go func() {
			defer wg.Done()

			select {
			case <-rw.Context.Done():
				// Cancel the operation. Make the caller disarm after poll
				// returns.
				atomic.AddInt64(&needDisarm, 1)
				_ = deadline(time.Unix(0, 1))
			case <-doneC:
				// Nothing to do.
			}
		}()
	}

	var (
		t   T
		err error
	)

	pollErr := poll(func(fd uintptr) bool {
		t, err = rw.Do(int(fd))
		return ready(err)
	})

	if atomic.LoadInt64(&needDisarm) > 0 {
		_ = deadline(time.Time{})
	}

	if pollErr != nil {
		if rw.Context.Err() != nil || (setDeadline && errors.Is(pollErr, os.ErrDeadlineExceeded)) {
			// The caller canceled the operation or we set a deadline internally
			// and it was reached.
			//
			// Unpack a plain context error. We wait for the context to be done
			// to synchronize state externally. Otherwise we have noticed I/O
			// timeout wakeups when we set a deadline but the context was not
			// yet marked done.
			<-rw.Context.Done()
			return *new(T), os.NewSyscallError(rw.Op, rw.Context.Err())
		}

		// Error from syscall.RawConn methods. Conventionally the standard
		// library does not wrap internal/poll errors in os.NewSyscallError.
		return *new(T), pollErr
	}

	// Result from user function.
	return t, os.NewSyscallError(rw.Op, err)
}

// control executes Conn.control for op using the input function.
func (c *Conn) control(ctx context.Context, op string, f func(fd int) error) error {
	_, err := controlT(c, ctx, op, func(fd int) (struct{}, error) {
		return struct{}{}, f(fd)
	})
	return err
}

// controlT executes c.rc.Control for op using the input function, returning a
// newly allocated result T.
func controlT[T any](c *Conn, ctx context.Context, op string, f func(fd int) (T, error)) (T, error) {
	if atomic.LoadUint32(&c.closed) != 0 {
		// If the file descriptor is already closed, do nothing.
		return *new(T), os.NewSyscallError(op, unix.EBADF)
	}

	var (
		t   T
		err error
	)

	doErr := c.rc.Control(func(fd uintptr) {
		// Repeatedly attempt the syscall(s) invoked by f until completion is
		// indicated by the return value of ready or the context is canceled.
		//
		// The last values for t and err are captured outside of the closure for
		// use when the loop breaks.
		for {
			if err = ctx.Err(); err != nil {
				// Early exit due to context cancel.
				return
			}

			t, err = f(int(fd))
			if ready(err) {
				return
			}
		}
	})
	if doErr != nil {
		// Error from syscall.RawConn methods. Conventionally the standard
		// library does not wrap internal/poll errors in os.NewSyscallError.
		return *new(T), doErr
	}

	// Result from user function.
	return t, os.NewSyscallError(op, err)
}

// ready indicates readiness based on the value of err.
func ready(err error) bool {
	switch err {
	case unix.EAGAIN, unix.EINPROGRESS, unix.EINTR:
		// When a socket is in non-blocking mode, we might see a variety of errors:
		//  - EAGAIN: most common case for a socket read not being ready
		//  - EINPROGRESS: reported by some sockets when first calling connect
		//  - EINTR: system call interrupted, more frequently occurs in Go 1.14+
		//    because goroutines can be asynchronously preempted
		//
		// Return false to let the poller wait for readiness. See the source code
		// for internal/poll.FD.RawRead for more details.
		return false
	default:
		// Ready regardless of whether there was an error or no error.
		return true
	}
}

// Darwin and FreeBSD can't read or write 2GB+ files at a time,
// even on 64-bit systems.
// The same is true of socket implementations on many systems.
// See golang.org/issue/7812 and golang.org/issue/16266.
// Use 1GB instead of, say, 2GB-1, to keep subsequent reads aligned.
const maxRW = 1 << 30

Youez - 2016 - github.com/yon3zu
LinuXploit