/src/avahi/avahi-common/domain.c

Source
/***
  This file is part of avahi.

  avahi 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.

  avahi 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 avahi; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <assert.h>

#include "domain.h"
#include "malloc.h"
#include "error.h"
#include "address.h"
#include "utf8.h"

/* Read the first label from string *name, unescape "\" and write it to dest */
char *avahi_unescape_label(const char **name, char *dest, size_t size) {
    unsigned i = 0;
    char *d;

    assert(dest);
    assert(size > 0);
    assert(name);

    d = dest;

    for (;;) {
        if (i >= size)
            return NULL;

        if (**name == '.') {
            (*name)++;
            break;
        }

        if (**name == 0)
            break;

        if (**name == '\\') {
            /* Escaped character */

            (*name) ++;

            if (**name == 0)
                /* Ending NUL */
                return NULL;

            else if (**name == '\\' || **name == '.') {
                /* Escaped backslash or dot */
                *(d++) = *((*name) ++);
                i++;
            } else if (isdigit((unsigned char)**name)) {
                int n;

                /* Escaped literal ASCII character */

                if (!isdigit((unsigned char)*(*name+1)) || !isdigit((unsigned char)*(*name+2)))
                    return NULL;

                n = ((uint8_t) (**name - '0') * 100) + ((uint8_t) (*(*name+1) - '0') * 10) + ((uint8_t) (*(*name +2) - '0'));

                if (n > 255 || n == 0)
                    return NULL;

                *(d++) = (char) n;
                i++;

                (*name) += 3;
            } else
                return NULL;

        } else {

            /* Normal character */

            *(d++) = *((*name) ++);
            i++;
        }
    }

    assert(i < size);

    *d = 0;

    if (!avahi_utf8_valid(dest))
        return NULL;

    return dest;
}

/* Escape "\" and ".", append \0 */
char *avahi_escape_label(const char* src, size_t src_length, char **ret_name, size_t *ret_size) {
    char *r;

    assert(src);
    assert(ret_name);
    assert(*ret_name);
    assert(ret_size);
    assert(*ret_size > 0);

    r = *ret_name;

    while (src_length > 0) {
        if (*src == '.' || *src == '\\') {

            /* Dot or backslash */

            if (*ret_size < 3)
                return NULL;

            *((*ret_name) ++) = '\\';
            *((*ret_name) ++) = *src;
            (*ret_size) -= 2;

        } else if (
            *src == '_' ||
            *src == '-' ||
            (*src >= '0' && *src <= '9') ||
            (*src >= 'a' && *src <= 'z') ||
            (*src >= 'A' && *src <= 'Z')) {

            /* Proper character */

            if (*ret_size < 2)
                return NULL;

            *((*ret_name)++) = *src;
            (*ret_size) --;

        } else {

            /* Everything else */

            if (*ret_size < 5)
                return NULL;

            *((*ret_name) ++) = '\\';
            *((*ret_name) ++) = '0' + (char)  ((uint8_t) *src / 100);
            *((*ret_name) ++) = '0' + (char) (((uint8_t) *src / 10) % 10);
            *((*ret_name) ++) = '0' + (char)  ((uint8_t) *src % 10);

            (*ret_size) -= 4;
        }

        src_length --;
        src++;
    }

    **ret_name = 0;

    return r;
}

char *avahi_normalize_name(const char *s, char *ret_s, size_t size) {
    int empty = 1;
    char *r;

    assert(s);
    assert(ret_s);
    assert(size > 0);

    r = ret_s;
    *ret_s = 0;

    while (*s) {
        char label[AVAHI_LABEL_MAX];

        if (!(avahi_unescape_label(&s, label, sizeof(label))))
            return NULL;

        if (label[0] == 0) {

            if (*s == 0 && empty)
                return ret_s;

            return NULL;
        }

        if (!empty) {
            if (size < 2)
                return NULL;

            *(r++) = '.';
            size--;

        } else
            empty = 0;

        if (!(avahi_escape_label(label, strlen(label), &r, &size)))
            return NULL;
    }

    return ret_s;
}

char *avahi_normalize_name_strdup(const char *s) {
    char t[AVAHI_DOMAIN_NAME_MAX];
    assert(s);

    if (!(avahi_normalize_name(s, t, sizeof(t))))
        return NULL;

    return avahi_strdup(t);
}

int avahi_domain_equal(const char *a, const char *b) {
    assert(a);
    assert(b);

    if (a == b)
        return 1;

    for (;;) {
        char ca[AVAHI_LABEL_MAX], cb[AVAHI_LABEL_MAX], *r;

        r = avahi_unescape_label(&a, ca, sizeof(ca));
        assert(r);
        r = avahi_unescape_label(&b, cb, sizeof(cb));
        assert(r);

        if (strcasecmp(ca, cb))
            return 0;

        if (!*a && !*b)
            return 1;
    }

    return 1;
}

int avahi_is_valid_service_type_generic(const char *t) {
    assert(t);

    if (strlen(t) >= AVAHI_DOMAIN_NAME_MAX || !*t)
        return 0;

    do {
        char label[AVAHI_LABEL_MAX];

        if (!(avahi_unescape_label(&t, label, sizeof(label))))
            return 0;

        if (strlen(label) <= 2 || label[0] != '_')
            return 0;

    } while (*t);

    return 1;
}

int avahi_is_valid_service_type_strict(const char *t) {
    char label[AVAHI_LABEL_MAX];
    assert(t);

    if (strlen(t) >= AVAHI_DOMAIN_NAME_MAX || !*t)
        return 0;

    /* Application name */

    if (!(avahi_unescape_label(&t, label, sizeof(label))))
        return 0;

    if (strlen(label) <= 2 || label[0] != '_')
        return 0;

    if (!*t)
        return 0;

    /* _tcp or _udp boilerplate */

    if (!(avahi_unescape_label(&t, label, sizeof(label))))
        return 0;

    if (strcasecmp(label, "_tcp") && strcasecmp(label, "_udp"))
        return 0;

    if (*t)
        return 0;

    return 1;
}

const char *avahi_get_type_from_subtype(const char *t) {
    char label[AVAHI_LABEL_MAX];
    const char *ret;
    assert(t);

    if (strlen(t) >= AVAHI_DOMAIN_NAME_MAX || !*t)
        return NULL;

    /* Subtype name */

    if (!(avahi_unescape_label(&t, label, sizeof(label))))
        return NULL;

    if (strlen(label) <= 2 || label[0] != '_')
        return NULL;

    if (!*t)
        return NULL;

    /* String "_sub" */

    if (!(avahi_unescape_label(&t, label, sizeof(label))))
        return NULL;

    if (strcasecmp(label, "_sub"))
        return NULL;

    if (!*t)
        return NULL;

    ret = t;

    /* Application name */

    if (!(avahi_unescape_label(&t, label, sizeof(label))))
        return NULL;

    if (strlen(label) <= 2 || label[0] != '_')
        return NULL;

    if (!*t)
        return NULL;

    /* _tcp or _udp boilerplate */

    if (!(avahi_unescape_label(&t, label, sizeof(label))))
        return NULL;

    if (strcasecmp(label, "_tcp") && strcasecmp(label, "_udp"))
        return NULL;

    if (*t)
        return NULL;

    return ret;
}

int avahi_is_valid_service_subtype(const char *t) {
    assert(t);

    return !!avahi_get_type_from_subtype(t);
}

int avahi_is_valid_domain_name(const char *t) {
    int is_first = 1;
    char normalized[AVAHI_DOMAIN_NAME_MAX];
    assert(t);

    if (strlen(t) >= AVAHI_DOMAIN_NAME_MAX)
        return 0;

    if (!(avahi_normalize_name(t, normalized, sizeof(normalized))))
        return 0;

    do {
        char label[AVAHI_LABEL_MAX];

        if (!(avahi_unescape_label(&t, label, sizeof(label))))
            return 0;

        /* Explicitly allow the root domain name */
        if (is_first && label[0] == 0 && *t == 0)
            return 1;

        is_first = 0;

        if (label[0] == 0)
            return 0;

    } while (*t);

    return 1;
}

int avahi_is_valid_service_name(const char *t) {
    assert(t);

    if (strlen(t) >= AVAHI_LABEL_MAX || !*t || !avahi_utf8_valid(t))
        return 0;

    return 1;
}

int avahi_is_valid_host_name(const char *t) {
    char label[AVAHI_LABEL_MAX];
    assert(t);

    if (strlen(t) >= AVAHI_DOMAIN_NAME_MAX || !*t)
        return 0;

    if (!(avahi_unescape_label(&t, label, sizeof(label))))
        return 0;

    if (strlen(label) < 1)
        return 0;

    if (*t)
        return 0;

    return 1;
}

unsigned avahi_domain_hash(const char *s) {
    unsigned hash = 0;

    while (*s) {
        char c[AVAHI_LABEL_MAX], *p, *r;

        r = avahi_unescape_label(&s, c, sizeof(c));
        assert(r);

        for (p = c; *p; p++)
            hash = 31 * hash + tolower((unsigned char)*p);
    }

    return hash;
}

int avahi_service_name_join(char *p, size_t size, const char *name, const char *type, const char *domain) {
    char escaped_name[AVAHI_LABEL_MAX*4];
    char normalized_type[AVAHI_DOMAIN_NAME_MAX];
    char normalized_domain[AVAHI_DOMAIN_NAME_MAX];

    assert(p);

    /* Validity checks */

    if ((name && !avahi_is_valid_service_name(name)))
        return AVAHI_ERR_INVALID_SERVICE_NAME;

    if (!avahi_is_valid_service_type_generic(type))
        return AVAHI_ERR_INVALID_SERVICE_TYPE;

    if (!avahi_is_valid_domain_name(domain))
        return AVAHI_ERR_INVALID_DOMAIN_NAME;

    /* Preparation */

    if (name) {
        size_t l = sizeof(escaped_name);
        char *e = escaped_name, *r;
        r = avahi_escape_label(name, strlen(name), &e, &l);
        assert(r);
    }

    if (!(avahi_normalize_name(type, normalized_type, sizeof(normalized_type))))
        return AVAHI_ERR_INVALID_SERVICE_TYPE;

    if (!(avahi_normalize_name(domain, normalized_domain, sizeof(normalized_domain))))
        return AVAHI_ERR_INVALID_DOMAIN_NAME;

    /* Concatenation */

    snprintf(p, size, "%s%s%s.%s", name ? escaped_name : "", name ? "." : "", normalized_type, normalized_domain);

    return AVAHI_OK;
}

#ifndef HAVE_STRLCPY

static size_t strlcpy(char *dest, const char *src, size_t n) {
    assert(dest);
    assert(src);

    if (n > 0) {
        strncpy(dest, src, n-1);
        dest[n-1] = 0;
    }

    return strlen(src);
}

#endif

int avahi_service_name_split(const char *p, char *name, size_t name_size, char *type, size_t type_size, char *domain, size_t domain_size) {
    enum {
        NAME,
        TYPE,
        DOMAIN
    } state;
    int type_empty = 1, domain_empty = 1;
    char *oname, *otype, *odomain;

    assert(p);
    assert(type);
    assert(type_size > 0);
    assert(domain);
    assert(domain_size > 0);

    oname = name;
    otype = type;
    odomain = domain;

    if (name) {
        assert(name_size > 0);
        *name = 0;
        state = NAME;
    } else
        state = TYPE;

    *type = *domain = 0;

    while (*p) {
        char buf[64];

        if (!(avahi_unescape_label(&p, buf, sizeof(buf))))
            return -1;

        switch (state) {
            case NAME:
                strlcpy(name, buf, name_size);
                state = TYPE;
                break;

            case TYPE:

                if (buf[0] == '_') {

                    if (!type_empty) {
                        if (!type_size)
                            return AVAHI_ERR_NO_MEMORY;

                        *(type++) = '.';
                        type_size --;

                    } else
                        type_empty = 0;

                    if (!(avahi_escape_label(buf, strlen(buf), &type, &type_size)))
                        return AVAHI_ERR_NO_MEMORY;

                    break;
                }

                state = DOMAIN;
                /* fall through */

            case DOMAIN:

                if (!domain_empty) {
                    if (!domain_size)
                        return AVAHI_ERR_NO_MEMORY;

                    *(domain++) = '.';
                    domain_size --;
                } else
                    domain_empty = 0;

                if (!(avahi_escape_label(buf, strlen(buf), &domain, &domain_size)))
                    return AVAHI_ERR_NO_MEMORY;

                break;
        }
    }

    if ((oname && !avahi_is_valid_service_name(oname)))
        return AVAHI_ERR_INVALID_SERVICE_NAME;

    if (!avahi_is_valid_service_type_strict(otype) && !avahi_is_valid_service_subtype(otype))
        return AVAHI_ERR_INVALID_SERVICE_TYPE;

    if (!avahi_is_valid_domain_name(odomain))
        return AVAHI_ERR_INVALID_DOMAIN_NAME;

    return 0;
}

int avahi_is_valid_fqdn(const char *t) {
    char label[AVAHI_LABEL_MAX];
    char normalized[AVAHI_DOMAIN_NAME_MAX];
    const char *k = t;
    AvahiAddress a;
    assert(t);

    if (strlen(t) >= AVAHI_DOMAIN_NAME_MAX)
        return 0;

    if (!avahi_is_valid_domain_name(t))
        return 0;

    /* Check if there are at least two labels*/
    if (!(avahi_unescape_label(&k, label, sizeof(label))))
        return 0;

    if (label[0] == 0 || !k)
        return 0;

    if (!(avahi_unescape_label(&k, label, sizeof(label))))
        return 0;

    if (label[0] == 0 || !k)
        return 0;

    /* Make sure that the name is not an IP address */
    if (!(avahi_normalize_name(t, normalized, sizeof(normalized))))
        return 0;

    if (avahi_address_parse(normalized, AVAHI_PROTO_UNSPEC, &a))
        return 0;

    return 1;
}

Coverage Report

Created: 2026-06-30 06:08

Line	Count	Source
1		/***
2		This file is part of avahi.
3
4		avahi is free software; you can redistribute it and/or modify it
5		under the terms of the GNU Lesser General Public License as
6		published by the Free Software Foundation; either version 2.1 of the
7		License, or (at your option) any later version.
8
9		avahi is distributed in the hope that it will be useful, but WITHOUT
10		ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11		or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
12		Public License for more details.
13
14		You should have received a copy of the GNU Lesser General Public
15		License along with avahi; if not, write to the Free Software
16		Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
17		USA.
18		***/
19
20		#ifdef HAVE_CONFIG_H
21		#include <config.h>
22		#endif
23
24		#include <string.h>
25		#include <unistd.h>
26		#include <fcntl.h>
27		#include <errno.h>
28		#include <limits.h>
29		#include <stdio.h>
30		#include <ctype.h>
31		#include <stdlib.h>
32		#include <assert.h>
33
34		#include "domain.h"
35		#include "malloc.h"
36		#include "error.h"
37		#include "address.h"
38		#include "utf8.h"
39
40		/* Read the first label from string name, unescape "\" and write it to dest /
41	0	char avahi_unescape_label(const char name, char dest, size_t size) {
42	0	unsigned i = 0;
43	0	char *d;
44
45	0	assert(dest);
46	0	assert(size > 0);
47	0	assert(name);
48
49	0	d = dest;
50
51	0	for (;;) {
52	0	if (i >= size)
53	0	return NULL;
54
55	0	if (**name == '.') {
56	0	(*name)++;
57	0	break;
58	0	}
59
60	0	if (**name == 0)
61	0	break;
62
63	0	if (**name == '\\') {
64		/* Escaped character */
65
66	0	(*name) ++;
67
68	0	if (**name == 0)
69		/* Ending NUL */
70	0	return NULL;
71
72	0	else if (name == '\\' \|\| name == '.') {
73		/* Escaped backslash or dot */
74	0	(d++) = ((*name) ++);
75	0	i++;
76	0	} else if (isdigit((unsigned char)**name)) {
77	0	int n;
78
79		/* Escaped literal ASCII character */
80
81	0	if (!isdigit((unsigned char)(name+1)) \|\| !isdigit((unsigned char)(name+2)))
82	0	return NULL;
83
84	0	n = ((uint8_t) (*name - '0') 100) + ((uint8_t) ((name+1) - '0') * 10) + ((uint8_t) ((name +2) - '0'));
85
86	0	if (n > 255 \|\| n == 0)
87	0	return NULL;
88
89	0	*(d++) = (char) n;
90	0	i++;
91
92	0	(*name) += 3;
93	0	} else
94	0	return NULL;
95
96	0	} else {
97
98		/* Normal character */
99
100	0	(d++) = ((*name) ++);
101	0	i++;
102	0	}
103	0	}
104
105	0	assert(i < size);
106
107	0	*d = 0;
108
109	0	if (!avahi_utf8_valid(dest))
110	0	return NULL;
111
112	0	return dest;
113	0	}
114
115		/* Escape "\" and ".", append \0 */
116	0	char avahi_escape_label(const char src, size_t src_length, char *ret_name, size_t ret_size) {
117	0	char *r;
118
119	0	assert(src);
120	0	assert(ret_name);
121	0	assert(*ret_name);
122	0	assert(ret_size);
123	0	assert(*ret_size > 0);
124
125	0	r = *ret_name;
126
127	0	while (src_length > 0) {
128	0	if (src == '.' \|\| src == '\\') {
129
130		/* Dot or backslash */
131
132	0	if (*ret_size < 3)
133	0	return NULL;
134
135	0	((ret_name) ++) = '\\';
136	0	((ret_name) ++) = *src;
137	0	(*ret_size) -= 2;
138
139	0	} else if (
140	0	*src == '_' \|\|
141	0	*src == '-' \|\|
142	0	(src >= '0' && src <= '9') \|\|
143	0	(src >= 'a' && src <= 'z') \|\|
144	0	(src >= 'A' && src <= 'Z')) {
145
146		/* Proper character */
147
148	0	if (*ret_size < 2)
149	0	return NULL;
150
151	0	((ret_name)++) = *src;
152	0	(*ret_size) --;
153
154	0	} else {
155
156		/* Everything else */
157
158	0	if (*ret_size < 5)
159	0	return NULL;
160
161	0	((ret_name) ++) = '\\';
162	0	((ret_name) ++) = '0' + (char) ((uint8_t) *src / 100);
163	0	((ret_name) ++) = '0' + (char) (((uint8_t) *src / 10) % 10);
164	0	((ret_name) ++) = '0' + (char) ((uint8_t) *src % 10);
165
166	0	(*ret_size) -= 4;
167	0	}
168
169	0	src_length --;
170	0	src++;
171	0	}
172
173	0	**ret_name = 0;
174
175	0	return r;
176	0	}
177
178	0	char avahi_normalize_name(const char s, char *ret_s, size_t size) {
179	0	int empty = 1;
180	0	char *r;
181
182	0	assert(s);
183	0	assert(ret_s);
184	0	assert(size > 0);
185
186	0	r = ret_s;
187	0	*ret_s = 0;
188
189	0	while (*s) {
190	0	char label[AVAHI_LABEL_MAX];
191
192	0	if (!(avahi_unescape_label(&s, label, sizeof(label))))
193	0	return NULL;
194
195	0	if (label[0] == 0) {
196
197	0	if (*s == 0 && empty)
198	0	return ret_s;
199
200	0	return NULL;
201	0	}
202
203	0	if (!empty) {
204	0	if (size < 2)
205	0	return NULL;
206
207	0	*(r++) = '.';
208	0	size--;
209
210	0	} else
211	0	empty = 0;
212
213	0	if (!(avahi_escape_label(label, strlen(label), &r, &size)))
214	0	return NULL;
215	0	}
216
217	0	return ret_s;
218	0	}
219
220	0	char avahi_normalize_name_strdup(const char s) {
221	0	char t[AVAHI_DOMAIN_NAME_MAX];
222	0	assert(s);
223
224	0	if (!(avahi_normalize_name(s, t, sizeof(t))))
225	0	return NULL;
226
227	0	return avahi_strdup(t);
228	0	}
229
230	0	int avahi_domain_equal(const char a, const char b) {
231	0	assert(a);
232	0	assert(b);
233
234	0	if (a == b)
235	0	return 1;
236
237	0	for (;;) {
238	0	char ca[AVAHI_LABEL_MAX], cb[AVAHI_LABEL_MAX], *r;
239
240	0	r = avahi_unescape_label(&a, ca, sizeof(ca));
241	0	assert(r);
242	0	r = avahi_unescape_label(&b, cb, sizeof(cb));
243	0	assert(r);
244
245	0	if (strcasecmp(ca, cb))
246	0	return 0;
247
248	0	if (!a && !b)
249	0	return 1;
250	0	}
251
252	0	return 1;
253	0	}
254
255	0	int avahi_is_valid_service_type_generic(const char *t) {
256	0	assert(t);
257
258	0	if (strlen(t) >= AVAHI_DOMAIN_NAME_MAX \|\| !*t)
259	0	return 0;
260
261	0	do {
262	0	char label[AVAHI_LABEL_MAX];
263
264	0	if (!(avahi_unescape_label(&t, label, sizeof(label))))
265	0	return 0;
266
267	0	if (strlen(label) <= 2 \|\| label[0] != '_')
268	0	return 0;
269
270	0	} while (*t);
271
272	0	return 1;
273	0	}
274
275	0	int avahi_is_valid_service_type_strict(const char *t) {
276	0	char label[AVAHI_LABEL_MAX];
277	0	assert(t);
278
279	0	if (strlen(t) >= AVAHI_DOMAIN_NAME_MAX \|\| !*t)
280	0	return 0;
281
282		/* Application name */
283
284	0	if (!(avahi_unescape_label(&t, label, sizeof(label))))
285	0	return 0;
286
287	0	if (strlen(label) <= 2 \|\| label[0] != '_')
288	0	return 0;
289
290	0	if (!*t)
291	0	return 0;
292
293		/* _tcp or _udp boilerplate */
294
295	0	if (!(avahi_unescape_label(&t, label, sizeof(label))))
296	0	return 0;
297
298	0	if (strcasecmp(label, "_tcp") && strcasecmp(label, "_udp"))
299	0	return 0;
300
301	0	if (*t)
302	0	return 0;
303
304	0	return 1;
305	0	}
306
307	0	const char avahi_get_type_from_subtype(const char t) {
308	0	char label[AVAHI_LABEL_MAX];
309	0	const char *ret;
310	0	assert(t);
311
312	0	if (strlen(t) >= AVAHI_DOMAIN_NAME_MAX \|\| !*t)
313	0	return NULL;
314
315		/* Subtype name */
316
317	0	if (!(avahi_unescape_label(&t, label, sizeof(label))))
318	0	return NULL;
319
320	0	if (strlen(label) <= 2 \|\| label[0] != '_')
321	0	return NULL;
322
323	0	if (!*t)
324	0	return NULL;
325
326		/* String "_sub" */
327
328	0	if (!(avahi_unescape_label(&t, label, sizeof(label))))
329	0	return NULL;
330
331	0	if (strcasecmp(label, "_sub"))
332	0	return NULL;
333
334	0	if (!*t)
335	0	return NULL;
336
337	0	ret = t;
338
339		/* Application name */
340
341	0	if (!(avahi_unescape_label(&t, label, sizeof(label))))
342	0	return NULL;
343
344	0	if (strlen(label) <= 2 \|\| label[0] != '_')
345	0	return NULL;
346
347	0	if (!*t)
348	0	return NULL;
349
350		/* _tcp or _udp boilerplate */
351
352	0	if (!(avahi_unescape_label(&t, label, sizeof(label))))
353	0	return NULL;
354
355	0	if (strcasecmp(label, "_tcp") && strcasecmp(label, "_udp"))
356	0	return NULL;
357
358	0	if (*t)
359	0	return NULL;
360
361	0	return ret;
362	0	}
363
364	0	int avahi_is_valid_service_subtype(const char *t) {
365	0	assert(t);
366
367	0	return !!avahi_get_type_from_subtype(t);
368	0	}
369
370	0	int avahi_is_valid_domain_name(const char *t) {
371	0	int is_first = 1;
372	0	char normalized[AVAHI_DOMAIN_NAME_MAX];
373	0	assert(t);
374
375	0	if (strlen(t) >= AVAHI_DOMAIN_NAME_MAX)
376	0	return 0;
377
378	0	if (!(avahi_normalize_name(t, normalized, sizeof(normalized))))
379	0	return 0;
380
381	0	do {
382	0	char label[AVAHI_LABEL_MAX];
383
384	0	if (!(avahi_unescape_label(&t, label, sizeof(label))))
385	0	return 0;
386
387		/* Explicitly allow the root domain name */
388	0	if (is_first && label[0] == 0 && *t == 0)
389	0	return 1;
390
391	0	is_first = 0;
392
393	0	if (label[0] == 0)
394	0	return 0;
395
396	0	} while (*t);
397
398	0	return 1;
399	0	}
400
401	0	int avahi_is_valid_service_name(const char *t) {
402	0	assert(t);
403
404	0	if (strlen(t) >= AVAHI_LABEL_MAX \|\| !*t \|\| !avahi_utf8_valid(t))
405	0	return 0;
406
407	0	return 1;
408	0	}
409
410	0	int avahi_is_valid_host_name(const char *t) {
411	0	char label[AVAHI_LABEL_MAX];
412	0	assert(t);
413
414	0	if (strlen(t) >= AVAHI_DOMAIN_NAME_MAX \|\| !*t)
415	0	return 0;
416
417	0	if (!(avahi_unescape_label(&t, label, sizeof(label))))
418	0	return 0;
419
420	0	if (strlen(label) < 1)
421	0	return 0;
422
423	0	if (*t)
424	0	return 0;
425
426	0	return 1;
427	0	}
428
429	0	unsigned avahi_domain_hash(const char *s) {
430	0	unsigned hash = 0;
431
432	0	while (*s) {
433	0	char c[AVAHI_LABEL_MAX], p, r;
434
435	0	r = avahi_unescape_label(&s, c, sizeof(c));
436	0	assert(r);
437
438	0	for (p = c; *p; p++)
439	0	hash = 31 * hash + tolower((unsigned char)*p);
440	0	}
441
442	0	return hash;
443	0	}
444
445	0	int avahi_service_name_join(char p, size_t size, const char name, const char type, const char domain) {
446	0	char escaped_name[AVAHI_LABEL_MAX*4];
447	0	char normalized_type[AVAHI_DOMAIN_NAME_MAX];
448	0	char normalized_domain[AVAHI_DOMAIN_NAME_MAX];
449
450	0	assert(p);
451
452		/* Validity checks */
453
454	0	if ((name && !avahi_is_valid_service_name(name)))
455	0	return AVAHI_ERR_INVALID_SERVICE_NAME;
456
457	0	if (!avahi_is_valid_service_type_generic(type))
458	0	return AVAHI_ERR_INVALID_SERVICE_TYPE;
459
460	0	if (!avahi_is_valid_domain_name(domain))
461	0	return AVAHI_ERR_INVALID_DOMAIN_NAME;
462
463		/* Preparation */
464
465	0	if (name) {
466	0	size_t l = sizeof(escaped_name);
467	0	char e = escaped_name, r;
468	0	r = avahi_escape_label(name, strlen(name), &e, &l);
469	0	assert(r);
470	0	}
471
472	0	if (!(avahi_normalize_name(type, normalized_type, sizeof(normalized_type))))
473	0	return AVAHI_ERR_INVALID_SERVICE_TYPE;
474
475	0	if (!(avahi_normalize_name(domain, normalized_domain, sizeof(normalized_domain))))
476	0	return AVAHI_ERR_INVALID_DOMAIN_NAME;
477
478		/* Concatenation */
479
480	0	snprintf(p, size, "%s%s%s.%s", name ? escaped_name : "", name ? "." : "", normalized_type, normalized_domain);
481
482	0	return AVAHI_OK;
483	0	}
484
485		#ifndef HAVE_STRLCPY
486
487		static size_t strlcpy(char dest, const char src, size_t n) {
488		assert(dest);
489		assert(src);
490
491		if (n > 0) {
492		strncpy(dest, src, n-1);
493		dest[n-1] = 0;
494		}
495
496		return strlen(src);
497		}
498
499		#endif
500
501	0	int avahi_service_name_split(const char p, char name, size_t name_size, char type, size_t type_size, char domain, size_t domain_size) {
502	0	enum {
503	0	NAME,
504	0	TYPE,
505	0	DOMAIN
506	0	} state;
507	0	int type_empty = 1, domain_empty = 1;
508	0	char oname, otype, *odomain;
509
510	0	assert(p);
511	0	assert(type);
512	0	assert(type_size > 0);
513	0	assert(domain);
514	0	assert(domain_size > 0);
515
516	0	oname = name;
517	0	otype = type;
518	0	odomain = domain;
519
520	0	if (name) {
521	0	assert(name_size > 0);
522	0	*name = 0;
523	0	state = NAME;
524	0	} else
525	0	state = TYPE;
526
527	0	type = domain = 0;
528
529	0	while (*p) {
530	0	char buf[64];
531
532	0	if (!(avahi_unescape_label(&p, buf, sizeof(buf))))
533	0	return -1;
534
535	0	switch (state) {
536	0	case NAME:
537	0	strlcpy(name, buf, name_size);
538	0	state = TYPE;
539	0	break;
540
541	0	case TYPE:
542
543	0	if (buf[0] == '_') {
544
545	0	if (!type_empty) {
546	0	if (!type_size)
547	0	return AVAHI_ERR_NO_MEMORY;
548
549	0	*(type++) = '.';
550	0	type_size --;
551
552	0	} else
553	0	type_empty = 0;
554
555	0	if (!(avahi_escape_label(buf, strlen(buf), &type, &type_size)))
556	0	return AVAHI_ERR_NO_MEMORY;
557
558	0	break;
559	0	}
560
561	0	state = DOMAIN;
562		/* fall through */
563
564	0	case DOMAIN:
565
566	0	if (!domain_empty) {
567	0	if (!domain_size)
568	0	return AVAHI_ERR_NO_MEMORY;
569
570	0	*(domain++) = '.';
571	0	domain_size --;
572	0	} else
573	0	domain_empty = 0;
574
575	0	if (!(avahi_escape_label(buf, strlen(buf), &domain, &domain_size)))
576	0	return AVAHI_ERR_NO_MEMORY;
577
578	0	break;
579	0	}
580	0	}
581
582	0	if ((oname && !avahi_is_valid_service_name(oname)))
583	0	return AVAHI_ERR_INVALID_SERVICE_NAME;
584
585	0	if (!avahi_is_valid_service_type_strict(otype) && !avahi_is_valid_service_subtype(otype))
586	0	return AVAHI_ERR_INVALID_SERVICE_TYPE;
587
588	0	if (!avahi_is_valid_domain_name(odomain))
589	0	return AVAHI_ERR_INVALID_DOMAIN_NAME;
590
591	0	return 0;
592	0	}
593
594	0	int avahi_is_valid_fqdn(const char *t) {
595	0	char label[AVAHI_LABEL_MAX];
596	0	char normalized[AVAHI_DOMAIN_NAME_MAX];
597	0	const char *k = t;
598	0	AvahiAddress a;
599	0	assert(t);
600
601	0	if (strlen(t) >= AVAHI_DOMAIN_NAME_MAX)
602	0	return 0;
603
604	0	if (!avahi_is_valid_domain_name(t))
605	0	return 0;
606
607		/* Check if there are at least two labels*/
608	0	if (!(avahi_unescape_label(&k, label, sizeof(label))))
609	0	return 0;
610
611	0	if (label[0] == 0 \|\| !k)
612	0	return 0;
613
614	0	if (!(avahi_unescape_label(&k, label, sizeof(label))))
615	0	return 0;
616
617	0	if (label[0] == 0 \|\| !k)
618	0	return 0;
619
620		/* Make sure that the name is not an IP address */
621	0	if (!(avahi_normalize_name(t, normalized, sizeof(normalized))))
622	0	return 0;
623
624	0	if (avahi_address_parse(normalized, AVAHI_PROTO_UNSPEC, &a))
625	0	return 0;
626
627	0	return 1;
628	0	}