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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:06:34 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 12:06:34 +0000 |
commit | 5e61585d76ae77fd5e9e96ebabb57afa4d74880d (patch) | |
tree | 2b467823aaeebc7ef8bc9e3cabe8074eaef1666d /src/dns/dns_strerror.c | |
parent | Initial commit. (diff) | |
download | postfix-5b7b6342ca8708be5ee306c089f8c5b3d3d122d8.tar.xz postfix-5b7b6342ca8708be5ee306c089f8c5b3d3d122d8.zip |
Adding upstream version 3.5.24.upstream/3.5.24upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/dns/dns_strerror.c')
-rw-r--r-- | src/dns/dns_strerror.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/src/dns/dns_strerror.c b/src/dns/dns_strerror.c new file mode 100644 index 0000000..9e56d3b --- /dev/null +++ b/src/dns/dns_strerror.c @@ -0,0 +1,69 @@ +/*++ +/* NAME +/* dns_strerror 3 +/* SUMMARY +/* name service lookup error code to string +/* SYNOPSIS +/* #include <dhs.h> +/* +/* const char *dns_strerror(code) +/* int code; +/* DESCRIPTION +/* dns_strerror() maps a name service lookup error to printable string. +/* The result is for read-only purposes, and unknown codes share a +/* common string buffer. +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/*--*/ + +/* System library. */ + +#include <sys_defs.h> +#include <netdb.h> + +/* Utility library. */ + +#include <vstring.h> + +/* DNS library. */ + +#include "dns.h" + + /* + * Mapping from error code to printable string. The herror() routine does + * something similar, but has output only to the stderr stream. + */ +struct dns_error_map { + unsigned error; + const char *text; +}; + +static struct dns_error_map dns_error_map[] = { + HOST_NOT_FOUND, "Host not found", + TRY_AGAIN, "Host not found, try again", + NO_RECOVERY, "Non-recoverable error", + NO_DATA, "Host found but no data record of requested type", +}; + +/* dns_strerror - map resolver error code to printable string */ + +const char *dns_strerror(unsigned error) +{ + static VSTRING *unknown = 0; + unsigned i; + + for (i = 0; i < sizeof(dns_error_map) / sizeof(dns_error_map[0]); i++) + if (dns_error_map[i].error == error) + return (dns_error_map[i].text); + if (unknown == 0) + unknown = vstring_alloc(sizeof("Unknown error XXXXXX")); + vstring_sprintf(unknown, "Unknown error %u", error); + return (vstring_str(unknown)); +} |