1.\" Copyright (c) 2020 Ryan Moeller <freqlabs@FreeBSD.org> 2.\" 3.\" Redistribution and use in source and binary forms, with or without 4.\" modification, are permitted provided that the following conditions 5.\" are met: 6.\" 1. Redistributions of source code must retain the above copyright 7.\" notice, this list of conditions and the following disclaimer. 8.\" 2. Redistributions in binary form must reproduce the above copyright 9.\" notice, this list of conditions and the following disclaimer in the 10.\" documentation and/or other materials provided with the distribution. 11.\" 12.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 13.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 14.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 15.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 16.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 17.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 18.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 19.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 20.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 21.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 22.\" SUCH DAMAGE. 23.\" 24.Dd December 6, 2023 25.Dt CAP_NETDB 3 26.Os 27.Sh NAME 28.Nm cap_getprotobyname , 29.Nd "library for getting network proto entry in capability mode" 30.Sh LIBRARY 31.Lb libcap_netdb 32.Sh SYNOPSIS 33.In sys/nv.h 34.In libcasper.h 35.In casper/cap_netdb.h 36.Ft "struct protoent *" 37.Fn cap_getprotobyname "const cap_channel_t *chan" "const char *name" 38.Sh DESCRIPTION 39The function 40.Fn cap_getprotobyname 41is equivalent to 42.Xr getprotobyname 3 43except that the connection to the 44.Nm system.netdb 45service needs to be provided. 46It is reentrant but not thread-safe. 47That is, it may be called from separate threads only with different 48.Vt cap_channel_t 49arguments or with synchronization. 50.Sh EXAMPLES 51The following example first opens a capability to casper and then uses this 52capability to create the 53.Nm system.netdb 54casper service and uses it to look up a protocol by name. 55.Bd -literal 56cap_channel_t *capcas, *capnetdb; 57struct protoent *ent; 58 59/* Open capability to Casper. */ 60capcas = cap_init(); 61if (capcas == NULL) 62 err(1, "Unable to contact Casper"); 63 64/* Enter capability mode sandbox. */ 65if (caph_enter() < 0) 66 err(1, "Unable to enter capability mode"); 67 68/* Use Casper capability to create capability to the system.netdb service. */ 69capnetdb = cap_service_open(capcas, "system.netdb"); 70if (capnetdb == NULL) 71 err(1, "Unable to open system.netdb service"); 72 73/* Close Casper capability, we don't need it anymore. */ 74cap_close(capcas); 75 76ent = cap_getprotobyname(capnetdb, "http"); 77if (ent == NULL) 78 errx(1, "cap_getprotobyname failed to find http proto"); 79.Ed 80.Sh SEE ALSO 81.Xr cap_enter 2 , 82.Xr caph_enter 3 , 83.Xr err 3 , 84.Xr getprotobyname 3 , 85.Xr capsicum 4 , 86.Xr nv 9 87.Sh AUTHORS 88The 89.Nm cap_netdb 90service was implemented by 91.An Ryan Moeller Aq Mt freqlabs@FreeBSD.org . 92