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Diffstat (limited to 'src/basic/hostname-util.c')
| -rw-r--r-- | src/basic/hostname-util.c | 251 |
1 files changed, 0 insertions, 251 deletions
diff --git a/src/basic/hostname-util.c b/src/basic/hostname-util.c deleted file mode 100644 index e44a357287..0000000000 --- a/src/basic/hostname-util.c +++ /dev/null @@ -1,251 +0,0 @@ -/*** - This file is part of systemd. - - Copyright 2015 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <errno.h> -#include <limits.h> -#include <stdio.h> -#include <string.h> -#include <sys/utsname.h> -#include <unistd.h> - -#include "fd-util.h" -#include "fileio.h" -#include "hostname-util.h" -#include "macro.h" -#include "string-util.h" - -bool hostname_is_set(void) { - struct utsname u; - - assert_se(uname(&u) >= 0); - - if (isempty(u.nodename)) - return false; - - /* This is the built-in kernel default host name */ - if (streq(u.nodename, "(none)")) - return false; - - return true; -} - -char* gethostname_malloc(void) { - struct utsname u; - - /* This call tries to return something useful, either the actual hostname - * or it makes something up. The only reason it might fail is OOM. - * It might even return "localhost" if that's set. */ - - assert_se(uname(&u) >= 0); - - if (isempty(u.nodename) || streq(u.nodename, "(none)")) - return strdup(u.sysname); - - return strdup(u.nodename); -} - -int gethostname_strict(char **ret) { - struct utsname u; - char *k; - - /* This call will rather fail than make up a name. It will not return "localhost" either. */ - - assert_se(uname(&u) >= 0); - - if (isempty(u.nodename)) - return -ENXIO; - - if (streq(u.nodename, "(none)")) - return -ENXIO; - - if (is_localhost(u.nodename)) - return -ENXIO; - - k = strdup(u.nodename); - if (!k) - return -ENOMEM; - - *ret = k; - return 0; -} - -static bool hostname_valid_char(char c) { - return - (c >= 'a' && c <= 'z') || - (c >= 'A' && c <= 'Z') || - (c >= '0' && c <= '9') || - c == '-' || - c == '_' || - c == '.'; -} - -/** - * Check if s looks like a valid host name or FQDN. This does not do - * full DNS validation, but only checks if the name is composed of - * allowed characters and the length is not above the maximum allowed - * by Linux (c.f. dns_name_is_valid()). Trailing dot is allowed if - * allow_trailing_dot is true and at least two components are present - * in the name. Note that due to the restricted charset and length - * this call is substantially more conservative than - * dns_name_is_valid(). - */ -bool hostname_is_valid(const char *s, bool allow_trailing_dot) { - unsigned n_dots = 0; - const char *p; - bool dot; - - if (isempty(s)) - return false; - - /* Doesn't accept empty hostnames, hostnames with - * leading dots, and hostnames with multiple dots in a - * sequence. Also ensures that the length stays below - * HOST_NAME_MAX. */ - - for (p = s, dot = true; *p; p++) { - if (*p == '.') { - if (dot) - return false; - - dot = true; - n_dots++; - } else { - if (!hostname_valid_char(*p)) - return false; - - dot = false; - } - } - - if (dot && (n_dots < 2 || !allow_trailing_dot)) - return false; - - if (p-s > HOST_NAME_MAX) /* Note that HOST_NAME_MAX is 64 on - * Linux, but DNS allows domain names - * up to 255 characters */ - return false; - - return true; -} - -char* hostname_cleanup(char *s) { - char *p, *d; - bool dot; - - assert(s); - - strshorten(s, HOST_NAME_MAX); - - for (p = s, d = s, dot = true; *p; p++) { - if (*p == '.') { - if (dot) - continue; - - *(d++) = '.'; - dot = true; - } else if (hostname_valid_char(*p)) { - *(d++) = *p; - dot = false; - } - } - - if (dot && d > s) - d[-1] = 0; - else - *d = 0; - - return s; -} - -bool is_localhost(const char *hostname) { - assert(hostname); - - /* This tries to identify local host and domain names - * described in RFC6761 plus the redhatism of localdomain */ - - return strcaseeq(hostname, "localhost") || - strcaseeq(hostname, "localhost.") || - strcaseeq(hostname, "localhost.localdomain") || - strcaseeq(hostname, "localhost.localdomain.") || - endswith_no_case(hostname, ".localhost") || - endswith_no_case(hostname, ".localhost.") || - endswith_no_case(hostname, ".localhost.localdomain") || - endswith_no_case(hostname, ".localhost.localdomain."); -} - -bool is_gateway_hostname(const char *hostname) { - assert(hostname); - - /* This tries to identify the valid syntaxes for the our - * synthetic "gateway" host. */ - - return - strcaseeq(hostname, "gateway") || - strcaseeq(hostname, "gateway."); -} - -int sethostname_idempotent(const char *s) { - char buf[HOST_NAME_MAX + 1] = {}; - - assert(s); - - if (gethostname(buf, sizeof(buf)) < 0) - return -errno; - - if (streq(buf, s)) - return 0; - - if (sethostname(s, strlen(s)) < 0) - return -errno; - - return 1; -} - -int read_hostname_config(const char *path, char **hostname) { - _cleanup_fclose_ FILE *f = NULL; - char l[LINE_MAX]; - char *name = NULL; - - assert(path); - assert(hostname); - - f = fopen(path, "re"); - if (!f) - return -errno; - - /* may have comments, ignore them */ - FOREACH_LINE(l, f, return -errno) { - truncate_nl(l); - if (l[0] != '\0' && l[0] != '#') { - /* found line with value */ - name = hostname_cleanup(l); - name = strdup(name); - if (!name) - return -ENOMEM; - break; - } - } - - if (!name) - /* no non-empty line found */ - return -ENOENT; - - *hostname = name; - return 0; -} |