[getdns-users] SWIG, PHP, and Undefined Functions
Willem Toorop
willem at nlnetlabs.nl
Mon Feb 2 13:03:30 UTC 2015
Hi Scott,
Exactly repeating your steps works with me:
php > include('getdns.php');
php > print_r(get_extension_funcs("getdns"));
Array
(
[0] => getdns_bindata_size_set
[1] => getdns_bindata_size_get
[2] => getdns_bindata_data_set
[3] => getdns_bindata_data_get
[4] => new_getdns_bindata
[5] => getdns_strerror
[6] => getdns_list_get_length
[7] => getdns_list_get_data_type
[8] => getdns_list_get_dict
[9] => getdns_list_get_list
[10] => getdns_list_get_bindata
[11] => getdns_list_get_int
[12] => getdns_dict_get_names
[13] => getdns_dict_get_data_type
[14] => getdns_dict_get_dict
[15] => getdns_dict_get_list
[16] => getdns_dict_get_bindata
[17] => getdns_dict_get_int
[18] => getdns_list_create
[19] => getdns_list_create_with_context
[20] => getdns_list_create_with_memory_functions
[21] => getdns_list_create_with_extended_memory_functions
[22] => getdns_list_destroy
[23] => getdns_list_set_dict
[24] => getdns_list_set_list
[25] => getdns_list_set_bindata
[26] => getdns_list_set_int
[27] => getdns_dict_create
[28] => getdns_dict_create_with_context
[29] => getdns_dict_create_with_memory_functions
[30] => getdns_dict_create_with_extended_memory_functions
[31] => getdns_dict_destroy
[32] => getdns_dict_set_dict
[33] => getdns_dict_set_list
[34] => getdns_dict_set_bindata
[35] => getdns_dict_set_int
[36] => getdns_dict_remove_name
[37] => getdns_general
[38] => getdns_address
[39] => getdns_hostname
[40] => getdns_service
[41] => getdns_context_create
[42] => getdns_context_create_with_memory_functions
[43] => getdns_context_create_with_extended_memory_functions
[44] => getdns_context_destroy
[45] => getdns_cancel_callback
[46] => getdns_general_sync
[47] => getdns_address_sync
[48] => getdns_hostname_sync
[49] => getdns_service_sync
[50] => getdns_convert_dns_name_to_fqdn
[51] => getdns_convert_fqdn_to_dns_name
[52] => getdns_convert_ulabel_to_alabel
[53] => getdns_convert_alabel_to_ulabel
[54] => getdns_validate_dnssec
[55] => getdns_pretty_print_dict
[56] => getdns_display_ip_address
[57] => getdns_context_set_context_update_callback
[58] => getdns_context_set_resolution_type
[59] => getdns_context_set_namespaces
[60] => getdns_context_set_dns_transport
[61] => getdns_context_set_limit_outstanding_queries
[62] => getdns_context_set_timeout
[63] => getdns_context_set_follow_redirects
[64] => getdns_context_set_dns_root_servers
[65] => getdns_context_set_append_name
[66] => getdns_context_set_suffix
[67] => getdns_context_set_dnssec_trust_anchors
[68] => getdns_context_set_dnssec_allowed_skew
[69] => getdns_context_set_upstream_recursive_servers
[70] => getdns_context_set_edns_maximum_udp_payload_size
[71] => getdns_context_set_edns_extended_rcode
[72] => getdns_context_set_edns_version
[73] => getdns_context_set_edns_do_bit
[74] => getdns_context_set_memory_functions
[75] => getdns_context_set_extended_memory_functions
[76] => getdns_context_get_api_information
[77] => getdns_root_trust_anchor
[78] => getdns_context_set_return_dnssec_status
[79] => getdns_dict_util_set_string
[80] => getdns_dict_util_get_string
[81] => getdns_context_set_use_threads
[82] => getdns_context_get_num_pending_requests
[83] => getdns_context_process_async
[84] => getdns_eventloop_event_userarg_set
[85] => getdns_eventloop_event_userarg_get
[86] => getdns_eventloop_event_read_cb_set
[87] => getdns_eventloop_event_read_cb_get
[88] => getdns_eventloop_event_write_cb_set
[89] => getdns_eventloop_event_write_cb_get
[90] => getdns_eventloop_event_timeout_cb_set
[91] => getdns_eventloop_event_timeout_cb_get
[92] => getdns_eventloop_event_ev_set
[93] => getdns_eventloop_event_ev_get
[94] => new_getdns_eventloop_event
[95] => getdns_eventloop_event_init
[96] => getdns_eventloop_vmt_set
[97] => getdns_eventloop_vmt_get
[98] => new_getdns_eventloop
[99] => getdns_eventloop_vmt_cleanup_set
[100] => getdns_eventloop_vmt_cleanup_get
[101] => getdns_eventloop_vmt_schedule_set
[102] => getdns_eventloop_vmt_schedule_get
[103] => getdns_eventloop_vmt_clear_set
[104] => getdns_eventloop_vmt_clear_get
[105] => getdns_eventloop_vmt_run_set
[106] => getdns_eventloop_vmt_run_get
[107] => getdns_eventloop_vmt_run_once_set
[108] => getdns_eventloop_vmt_run_once_get
[109] => new_getdns_eventloop_vmt
[110] => getdns_context_set_eventloop
[111] => getdns_context_detach_eventloop
[112] => getdns_context_run
[113] => swig_getdns_alter_newobject
[114] => swig_getdns_get_newobject
)
Maybe it mattered that I had /usr/local/lib in my LD_LIBRARY_PATH though.
But this very direct approach doesn't give me an usable php interface
yet. I guess you have to work around the pass by reference style of
returning values (besides the return code).
php > $c = NULL;
php > $r = getdns_context_create($c,1);
php > print "$r\n";
(i.e. 311 == GETDNS_RETURN_INVALID_PARAMETER)
php > $r = getdns_context_create(&$c,1);
PHP Fatal error: Call-time pass-by-reference has been removed in php
shell code on line 1
Cheers,
-- Willem
Op 02-02-15 om 13:14 schreef Hollenbeck, Scott:
> I've been playing around with SWIG (http://www.swig.org/) in an attempt to create PHP language bindings for getdns. I've been able to build a PHP extension, but when I try to use it I get an "undefined function" error:
>
> Fatal error: Call to undefined function getdns_context_create() in /path/getdns.php on line 679
>
> These is the result of print_r(get_extension_funcs("getdns")):
>
> Array
> (
> [0] => getdns_address
> [1] => getdns_address_sync
> [2] => getdns_hostname
> [3] => getdns_hostname_sync
> [4] => getdns_service
> [5] => getdns_service_sync
> [6] => getdns_general
> [7] => getdns_general_sync
> [8] => getdns_dict_destroy
> [9] => swig_getdns_alter_newobject
> [10] => swig_getdns_get_newobject
> )
>
> Here's some of what nm reports (note the undefined symbols):
>
> sah at sah-vb:~/projects/getdns/src/php$ nm getdns.so|grep context
> U getdns_context_create
> U getdns_context_create_with_extended_memory_functions
> U getdns_context_create_with_memory_functions
> U getdns_context_destroy
>
> My swig interface file:
>
> %module getdns
> %{
> /* Put headers and other declarations here. */
> #include <getdns.h>
> #include <getdns_extra.h>
> %}
>
> %include <getdns.h>
> %include <getdns_extra.h>
>
> Here's how I'm building the extension:
>
> swig -php -outcurrentdir -I/usr/local/include/getdns ../getdns.i
> gcc `php-config --includes` -fPIC -c -I/usr/local/include/getdns getdns_wrap.c
> gcc getdns_wrap.o -o getdns.so -shared -L/usr/local/lib -lgetdns
>
> I wrote a small C program that works just fine using the same getdns shared library. I'm pretty sure I'm missing something obvious in the way I set up my SWIG interface and the code it produces, but I'm a SWIG noob - what did I miss?
>
> Scott
>
> _______________________________________________
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>
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