coffee809721232 commented on a change in pull request #5737: URL: https://github.com/apache/incubator-nuttx/pull/5737#discussion_r826618009
########## File path: libs/libc/netdb/lib_dn.c ########## @@ -0,0 +1,315 @@ +/**************************************************************************** + * libs/libc/netdb/lib_dn.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <string.h> +#include <resolv.h> + +/* RFC 1035 message compression */ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/* label start offsets of a compressed domain name s */ + +static int getoffs(FAR short *offs, FAR const unsigned char *base, + FAR const unsigned char *s) +{ + int i = 0; + + for (; ; ) + { + while (*s & 0xc0) + { + if ((*s & 0xc0) != 0xc0) + { + return 0; + } + + s = base + ((s[0] & 0x3f) << 8 | s[1]); + } + + if (!*s) + { + return i; + } + + if (s - base >= 0x4000) + { + return 0; + } + + offs[i++] = s - base; + s += *s + 1; + } +} + +/* label lengths of an ascii domain name s */ + +static int getlens(FAR unsigned char *lens, FAR const char *s, int l) +{ + int i = 0; + int j = 0; + int k = 0; + + for (; ; ) + { + for (; j < l && s[j] != '.'; j++); + if (j - k - 1u > 62) + { + return 0; + } + + lens[i++] = j - k; + if (j == l) + { + return i; + } + + k = ++j; + } +} + +/* longest suffix match of an ascii domain with a compressed domain name dn */ + +static int match(FAR int *offset, FAR const unsigned char *base, + FAR const unsigned char *dn, FAR const char *end, + FAR const unsigned char *lens, int nlen) +{ + int l; + int o; + int m = 0; + short offs[128]; + int noff = getoffs(offs, base, dn); + + if (!noff) Review comment: done ########## File path: libs/libc/netdb/lib_dn.c ########## @@ -0,0 +1,315 @@ +/**************************************************************************** + * libs/libc/netdb/lib_dn.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <string.h> +#include <resolv.h> + +/* RFC 1035 message compression */ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/* label start offsets of a compressed domain name s */ + +static int getoffs(FAR short *offs, FAR const unsigned char *base, + FAR const unsigned char *s) +{ + int i = 0; + + for (; ; ) + { + while (*s & 0xc0) + { + if ((*s & 0xc0) != 0xc0) + { + return 0; + } + + s = base + ((s[0] & 0x3f) << 8 | s[1]); + } + + if (!*s) + { + return i; + } + + if (s - base >= 0x4000) + { + return 0; + } + + offs[i++] = s - base; + s += *s + 1; + } +} + +/* label lengths of an ascii domain name s */ + +static int getlens(FAR unsigned char *lens, FAR const char *s, int l) +{ + int i = 0; + int j = 0; + int k = 0; + + for (; ; ) + { + for (; j < l && s[j] != '.'; j++); + if (j - k - 1u > 62) + { + return 0; + } + + lens[i++] = j - k; + if (j == l) + { + return i; + } + + k = ++j; + } +} + +/* longest suffix match of an ascii domain with a compressed domain name dn */ + +static int match(FAR int *offset, FAR const unsigned char *base, + FAR const unsigned char *dn, FAR const char *end, + FAR const unsigned char *lens, int nlen) +{ + int l; + int o; + int m = 0; + short offs[128]; + int noff = getoffs(offs, base, dn); + + if (!noff) + { + return 0; + } + + for (; ; ) + { + l = lens[--nlen]; + o = offs[--noff]; + end -= l; + if (l != base[o] || memcmp(base + o + 1, end, l)) Review comment: done ########## File path: libs/libc/netdb/lib_dn.c ########## @@ -0,0 +1,315 @@ +/**************************************************************************** + * libs/libc/netdb/lib_dn.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <string.h> +#include <resolv.h> + +/* RFC 1035 message compression */ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/* label start offsets of a compressed domain name s */ + +static int getoffs(FAR short *offs, FAR const unsigned char *base, + FAR const unsigned char *s) +{ + int i = 0; + + for (; ; ) + { + while (*s & 0xc0) + { + if ((*s & 0xc0) != 0xc0) + { + return 0; + } + + s = base + ((s[0] & 0x3f) << 8 | s[1]); + } + + if (!*s) + { + return i; + } + + if (s - base >= 0x4000) + { + return 0; + } + + offs[i++] = s - base; + s += *s + 1; + } +} + +/* label lengths of an ascii domain name s */ + +static int getlens(FAR unsigned char *lens, FAR const char *s, int l) +{ + int i = 0; + int j = 0; + int k = 0; + + for (; ; ) + { + for (; j < l && s[j] != '.'; j++); + if (j - k - 1u > 62) + { + return 0; + } + + lens[i++] = j - k; + if (j == l) + { + return i; + } + + k = ++j; + } +} + +/* longest suffix match of an ascii domain with a compressed domain name dn */ + +static int match(FAR int *offset, FAR const unsigned char *base, + FAR const unsigned char *dn, FAR const char *end, + FAR const unsigned char *lens, int nlen) +{ + int l; + int o; + int m = 0; + short offs[128]; + int noff = getoffs(offs, base, dn); + + if (!noff) + { + return 0; + } + + for (; ; ) + { + l = lens[--nlen]; + o = offs[--noff]; + end -= l; + if (l != base[o] || memcmp(base + o + 1, end, l)) + { + return m; + } + + *offset = o; + m += l; + if (nlen) + { + m++; + } + + if (!nlen || !noff) + { + return m; + } + + end--; + } +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +int dn_comp(FAR const char *src, FAR unsigned char *dst, int space, + FAR unsigned char **dnptrs, FAR unsigned char **lastdnptr) +{ + int i; + int j; + int n; + int m = 0; + int offset = 0; + int bestlen = 0; + int bestoff = 0; + unsigned char lens[127]; + FAR unsigned char **p; + FAR const char *end; + size_t l = strnlen(src, 255); + + if (l && src[l - 1] == '.') + { + l--; + } + + if (l > 253 || space <= 0) + { + return -1; + } + + if (!l) + { + *dst = 0; + return 1; + } + + end = src + l; + n = getlens(lens, src, l); + if (!n) + { + return -1; + } + + p = dnptrs; + if (p && *p) + { + for (p++; *p; p++) Review comment: done ########## File path: libs/libc/netdb/lib_dn.c ########## @@ -0,0 +1,315 @@ +/**************************************************************************** + * libs/libc/netdb/lib_dn.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <string.h> +#include <resolv.h> + +/* RFC 1035 message compression */ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/* label start offsets of a compressed domain name s */ + +static int getoffs(FAR short *offs, FAR const unsigned char *base, + FAR const unsigned char *s) +{ + int i = 0; + + for (; ; ) + { + while (*s & 0xc0) + { + if ((*s & 0xc0) != 0xc0) + { + return 0; + } + + s = base + ((s[0] & 0x3f) << 8 | s[1]); + } + + if (!*s) + { + return i; + } + + if (s - base >= 0x4000) + { + return 0; + } + + offs[i++] = s - base; + s += *s + 1; + } +} + +/* label lengths of an ascii domain name s */ + +static int getlens(FAR unsigned char *lens, FAR const char *s, int l) +{ + int i = 0; + int j = 0; + int k = 0; + + for (; ; ) + { + for (; j < l && s[j] != '.'; j++); + if (j - k - 1u > 62) + { + return 0; + } + + lens[i++] = j - k; + if (j == l) + { + return i; + } + + k = ++j; + } +} + +/* longest suffix match of an ascii domain with a compressed domain name dn */ + +static int match(FAR int *offset, FAR const unsigned char *base, + FAR const unsigned char *dn, FAR const char *end, + FAR const unsigned char *lens, int nlen) +{ + int l; + int o; + int m = 0; + short offs[128]; + int noff = getoffs(offs, base, dn); + + if (!noff) + { + return 0; + } + + for (; ; ) + { + l = lens[--nlen]; + o = offs[--noff]; + end -= l; + if (l != base[o] || memcmp(base + o + 1, end, l)) + { + return m; + } + + *offset = o; + m += l; + if (nlen) + { + m++; + } + + if (!nlen || !noff) + { + return m; + } + + end--; + } +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +int dn_comp(FAR const char *src, FAR unsigned char *dst, int space, + FAR unsigned char **dnptrs, FAR unsigned char **lastdnptr) +{ + int i; + int j; + int n; + int m = 0; + int offset = 0; + int bestlen = 0; + int bestoff = 0; + unsigned char lens[127]; + FAR unsigned char **p; + FAR const char *end; + size_t l = strnlen(src, 255); + + if (l && src[l - 1] == '.') + { + l--; + } + + if (l > 253 || space <= 0) + { + return -1; + } + + if (!l) + { + *dst = 0; + return 1; + } + + end = src + l; + n = getlens(lens, src, l); + if (!n) + { + return -1; + } + + p = dnptrs; + if (p && *p) + { + for (p++; *p; p++) + { + m = match(&offset, *dnptrs, *p, end, lens, n); + if (m > bestlen) + { + bestlen = m; + bestoff = offset; + if (m == l) + { + break; + } + } + } + } + + /* encode unmatched part */ + + if (space < l - bestlen + 2 + (bestlen - 1 < l - 1)) + { + return -1; + } + + memcpy(dst + 1, src, l - bestlen); + for (i = j = 0; i < l - bestlen; i += lens[j++] + 1) + { + dst[i] = lens[j]; + } + + /* add tail */ + + if (bestlen) Review comment: done ########## File path: libs/libc/netdb/lib_dn.c ########## @@ -0,0 +1,315 @@ +/**************************************************************************** + * libs/libc/netdb/lib_dn.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <string.h> +#include <resolv.h> + +/* RFC 1035 message compression */ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/* label start offsets of a compressed domain name s */ + +static int getoffs(FAR short *offs, FAR const unsigned char *base, + FAR const unsigned char *s) +{ + int i = 0; + + for (; ; ) + { + while (*s & 0xc0) + { + if ((*s & 0xc0) != 0xc0) + { + return 0; + } + + s = base + ((s[0] & 0x3f) << 8 | s[1]); + } + + if (!*s) + { + return i; + } + + if (s - base >= 0x4000) + { + return 0; + } + + offs[i++] = s - base; + s += *s + 1; + } +} + +/* label lengths of an ascii domain name s */ + +static int getlens(FAR unsigned char *lens, FAR const char *s, int l) +{ + int i = 0; + int j = 0; + int k = 0; + + for (; ; ) + { + for (; j < l && s[j] != '.'; j++); + if (j - k - 1u > 62) + { + return 0; + } + + lens[i++] = j - k; + if (j == l) + { + return i; + } + + k = ++j; + } +} + +/* longest suffix match of an ascii domain with a compressed domain name dn */ + +static int match(FAR int *offset, FAR const unsigned char *base, + FAR const unsigned char *dn, FAR const char *end, + FAR const unsigned char *lens, int nlen) +{ + int l; + int o; + int m = 0; + short offs[128]; + int noff = getoffs(offs, base, dn); + + if (!noff) + { + return 0; + } + + for (; ; ) + { + l = lens[--nlen]; + o = offs[--noff]; + end -= l; + if (l != base[o] || memcmp(base + o + 1, end, l)) + { + return m; + } + + *offset = o; + m += l; + if (nlen) + { + m++; + } + + if (!nlen || !noff) + { + return m; + } + + end--; + } +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +int dn_comp(FAR const char *src, FAR unsigned char *dst, int space, + FAR unsigned char **dnptrs, FAR unsigned char **lastdnptr) +{ + int i; + int j; + int n; + int m = 0; + int offset = 0; + int bestlen = 0; + int bestoff = 0; + unsigned char lens[127]; + FAR unsigned char **p; + FAR const char *end; + size_t l = strnlen(src, 255); + + if (l && src[l - 1] == '.') + { + l--; + } + + if (l > 253 || space <= 0) + { + return -1; + } + + if (!l) + { + *dst = 0; + return 1; + } + + end = src + l; + n = getlens(lens, src, l); + if (!n) + { + return -1; + } + + p = dnptrs; + if (p && *p) + { + for (p++; *p; p++) + { + m = match(&offset, *dnptrs, *p, end, lens, n); + if (m > bestlen) + { + bestlen = m; + bestoff = offset; + if (m == l) + { + break; + } + } + } + } + + /* encode unmatched part */ + + if (space < l - bestlen + 2 + (bestlen - 1 < l - 1)) + { + return -1; + } + + memcpy(dst + 1, src, l - bestlen); + for (i = j = 0; i < l - bestlen; i += lens[j++] + 1) + { + dst[i] = lens[j]; + } + + /* add tail */ + + if (bestlen) + { + dst[i++] = 0xc0 | bestoff >> 8; + dst[i++] = bestoff; + } + else + { + dst[i++] = 0; + } + + /* save dst pointer */ + + if (i > 2 && lastdnptr && dnptrs && *dnptrs) + { + while (*p) Review comment: done -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@nuttx.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
