diff options
Diffstat (limited to 'shared/systemd/src/basic/hostname-util.c')
| -rw-r--r-- | shared/systemd/src/basic/hostname-util.c | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/shared/systemd/src/basic/hostname-util.c b/shared/systemd/src/basic/hostname-util.c deleted file mode 100644 index a3cdc62e..00000000 --- a/shared/systemd/src/basic/hostname-util.c +++ /dev/null @@ -1,196 +0,0 @@ -/* SPDX-License-Identifier: LGPL-2.1-or-later */ - -#include "nm-sd-adapt-shared.h" - -#include <errno.h> -#include <limits.h> -#include <stdio.h> -#include <sys/utsname.h> -#include <unistd.h> - -#include "alloc-util.h" -#include "hostname-util.h" -#include "string-util.h" -#include "strv.h" - -#if 0 /* NM_IGNORED */ -char* gethostname_malloc(void) { - struct utsname u; - const char *s; - - /* 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); - - s = u.nodename; - if (isempty(s) || streq(s, "(none)")) - s = FALLBACK_HOSTNAME; - - return strdup(s); -} - -char* gethostname_short_malloc(void) { - struct utsname u; - const char *s; - - /* Like above, but kills the FQDN part if present. */ - - assert_se(uname(&u) >= 0); - - s = u.nodename; - if (isempty(s) || streq(s, "(none)") || s[0] == '.') { - s = FALLBACK_HOSTNAME; - assert(s[0] != '.'); - } - - return strndup(s, strcspn(s, ".")); -} -#endif /* NM_IGNORED */ - -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; -} - -bool valid_ldh_char(char c) { - /* "LDH" → "Letters, digits, hyphens", as per RFC 5890, Section 2.3.1 */ - - return - (c >= 'a' && c <= 'z') || - (c >= 'A' && c <= 'Z') || - (c >= '0' && c <= '9') || - c == '-'; -} - -bool hostname_is_valid(const char *s, ValidHostnameFlags flags) { - unsigned n_dots = 0; - const char *p; - bool dot, hyphen; - - /* Check if s looks like a valid hostname 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()). A trailing dot is allowed if - * VALID_HOSTNAME_TRAILING_DOT flag is set 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(). Doesn't accept empty hostnames, hostnames with leading dots, and hostnames - * with multiple dots in a sequence. Doesn't allow hyphens at the beginning or end of label. */ - - if (isempty(s)) - return false; - - if (streq(s, ".host")) /* Used by the container logic to denote the "root container" */ - return FLAGS_SET(flags, VALID_HOSTNAME_DOT_HOST); - - for (p = s, dot = hyphen = true; *p; p++) - if (*p == '.') { - if (dot || hyphen) - return false; - - dot = true; - hyphen = false; - n_dots++; - - } else if (*p == '-') { - if (dot) - return false; - - dot = false; - hyphen = true; - - } else { - if (!valid_ldh_char(*p)) - return false; - - dot = false; - hyphen = false; - } - - if (dot && (n_dots < 2 || !FLAGS_SET(flags, VALID_HOSTNAME_TRAILING_DOT))) - return false; - if (hyphen) - 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, hyphen; - - assert(s); - - for (p = s, d = s, dot = hyphen = true; *p && d - s < HOST_NAME_MAX; p++) - if (*p == '.') { - if (dot || hyphen) - continue; - - *(d++) = '.'; - dot = true; - hyphen = false; - - } else if (*p == '-') { - if (dot) - continue; - - *(d++) = '-'; - dot = false; - hyphen = true; - - } else if (valid_ldh_char(*p)) { - *(d++) = *p; - dot = false; - hyphen = false; - } - - if (d > s && IN_SET(d[-1], '-', '.')) - /* The dot can occur at most once, but we might have multiple - * hyphens, hence the loop */ - d--; - *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 STRCASE_IN_SET( - hostname, - "localhost", - "localhost.", - "localhost.localdomain", - "localhost.localdomain.") || - endswith_no_case(hostname, ".localhost") || - endswith_no_case(hostname, ".localhost.") || - endswith_no_case(hostname, ".localhost.localdomain") || - endswith_no_case(hostname, ".localhost.localdomain."); -} |