xref: /freebsd/lib/libcasper/services/cap_netdb/cap_netdb.3 (revision edf8578117e8844e02c0121147f45e4609b30680)
1.\" Copyright (c) 2020 Ryan Moeller <freqlabs@FreeBSD.org>
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24.Dd September 29, 2022
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.
46.Sh EXAMPLES
47The following example first opens a capability to casper and then uses this
48capability to create the
49.Nm system.netdb
50casper service and uses it to look up a protocol by name.
51.Bd -literal
52cap_channel_t *capcas, *capnetdb;
53struct protoent *ent;
54
55/* Open capability to Casper. */
56capcas = cap_init();
57if (capcas == NULL)
58	err(1, "Unable to contact Casper");
59
60/* Enter capability mode sandbox. */
61if (caph_enter() < 0)
62	err(1, "Unable to enter capability mode");
63
64/* Use Casper capability to create capability to the system.netdb service. */
65capnetdb = cap_service_open(capcas, "system.netdb");
66if (capnetdb == NULL)
67	err(1, "Unable to open system.netdb service");
68
69/* Close Casper capability, we don't need it anymore. */
70cap_close(capcas);
71
72ent = cap_getprotobyname(capnetdb, "http");
73if (ent == NULL)
74       errx(1, "cap_getprotobyname failed to find http proto");
75.Ed
76.Sh SEE ALSO
77.Xr cap_enter 2 ,
78.Xr caph_enter 3 ,
79.Xr err 3 ,
80.Xr getprotobyname 3 ,
81.Xr capsicum 4 ,
82.Xr nv 9
83.Sh AUTHORS
84The
85.Nm cap_netdb
86service was implemented by
87.An Ryan Moeller Aq Mt freqlabs@FreeBSD.org .
88