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Diffstat (limited to 'src/iri.c')
| -rw-r--r-- | src/iri.c | 449 |
1 files changed, 449 insertions, 0 deletions
diff --git a/src/iri.c b/src/iri.c new file mode 100644 index 0000000..4bac349 --- /dev/null +++ b/src/iri.c @@ -0,0 +1,449 @@ +/* IRI related functions. + Copyright (C) 2008-2011, 2015, 2018-2022 Free Software Foundation, + Inc. + +This file is part of GNU Wget. + +GNU Wget is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 3 of the License, or (at +your option) any later version. + +GNU Wget 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with Wget. If not, see <http://www.gnu.org/licenses/>. + +Additional permission under GNU GPL version 3 section 7 + +If you modify this program, or any covered work, by linking or +combining it with the OpenSSL project's OpenSSL library (or a +modified version of that library), containing parts covered by the +terms of the OpenSSL or SSLeay licenses, the Free Software Foundation +grants you additional permission to convey the resulting work. +Corresponding Source for a non-source form of such a combination +shall include the source code for the parts of OpenSSL used as well +as that of the covered work. */ + +#include "wget.h" + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <langinfo.h> +#include <errno.h> +#ifdef HAVE_ICONV +# include <iconv.h> +#endif +#include <idn2.h> +#if IDN2_VERSION_NUMBER < 0x00140000 +# include <unicase.h> +# include <unistr.h> +#endif + +#include "utils.h" +#include "url.h" +#include "c-strcase.h" +#include "c-strcasestr.h" +#include "xstrndup.h" + +/* Note: locale encoding is kept in options struct (opt.locale) */ + +/* Given a string containing "charset=XXX", return the encoding if found, + or NULL otherwise */ +char * +parse_charset (const char *str) +{ + const char *end; + char *charset; + + if (!str || !*str) + return NULL; + + str = c_strcasestr (str, "charset="); + if (!str) + return NULL; + + str += 8; + end = str; + + /* sXXXav: which chars should be banned ??? */ + while (*end && !c_isspace (*end)) + end++; + + /* sXXXav: could strdupdelim return NULL ? */ + charset = strdupdelim (str, end); + + /* Do a minimum check on the charset value */ + if (!check_encoding_name (charset)) + { + xfree (charset); + return NULL; + } + + /*logprintf (LOG_VERBOSE, "parse_charset: %s\n", quote (charset));*/ + + return charset; +} + +/* Find the locale used, or fall back on a default value */ +const char * +find_locale (void) +{ + const char *encoding = nl_langinfo(CODESET); + + if (!encoding || !*encoding) + return xstrdup("ASCII"); + + return xstrdup(encoding); +} + +/* Basic check of an encoding name. */ +bool +check_encoding_name (const char *encoding) +{ + const char *s = encoding; + + while (*s) + { + if (!c_isascii (*s) || c_isspace (*s)) + { + logprintf (LOG_VERBOSE, _("Encoding %s isn't valid\n"), quote (encoding)); + return false; + } + + s++; + } + + return true; +} + +#ifdef HAVE_ICONV +/* Do the conversion according to the passed conversion descriptor cd. *out + will contain the transcoded string on success. *out content is + unspecified otherwise. */ +static bool +do_conversion (const char *tocode, const char *fromcode, char const *in_org, size_t inlen, char **out) +{ + iconv_t cd; + /* sXXXav : hummm hard to guess... */ + size_t len, done, outlen; + int invalid = 0, tooshort = 0; + char *s, *in, *in_save; + + cd = iconv_open (tocode, fromcode); + if (cd == (iconv_t)(-1)) + { + logprintf (LOG_VERBOSE, _("Conversion from %s to %s isn't supported\n"), + quote_n (0, fromcode), quote_n (1, tocode)); + *out = NULL; + return false; + } + + /* iconv() has to work on an unescaped string */ + in_save = in = xstrndup (in_org, inlen); + url_unescape_except_reserved (in); + inlen = strlen(in); + + len = outlen = inlen * 2; + *out = s = xmalloc (outlen + 1); + done = 0; + + for (;;) + { + if (iconv (cd, (ICONV_CONST char **) &in, &inlen, out, &outlen) != (size_t)(-1) && + iconv (cd, NULL, NULL, out, &outlen) != (size_t)(-1)) + { + *out = s; + *(s + len - outlen - done) = '\0'; + xfree(in_save); + iconv_close(cd); + IF_DEBUG + { + /* not not print out embedded passwords, in_org might be an URL */ + if (!strchr(in_org, '@') && !strchr(*out, '@')) + debug_logprintf ("converted '%s' (%s) -> '%s' (%s)\n", in_org, fromcode, *out, tocode); + else + debug_logprintf ("logging suppressed, strings may contain password\n"); + } + return true; + } + + /* Incomplete or invalid multibyte sequence */ + if (errno == EINVAL || errno == EILSEQ) + { + if (!invalid) + logprintf (LOG_VERBOSE, + _("Incomplete or invalid multibyte sequence encountered\n")); + + invalid++; + **out = *in; + in++; + inlen--; + (*out)++; + outlen--; + } + else if (errno == E2BIG) /* Output buffer full */ + { + tooshort++; + done = len; + len = done + inlen * 2; + s = xrealloc (s, len + 1); + *out = s + done - outlen; + outlen += inlen * 2; + } + else /* Weird, we got an unspecified error */ + { + logprintf (LOG_VERBOSE, _("Unhandled errno %d\n"), errno); + break; + } + } + + xfree(in_save); + iconv_close(cd); + IF_DEBUG + { + /* not not print out embedded passwords, in_org might be an URL */ + if (!strchr(in_org, '@') && !strchr(*out, '@')) + debug_logprintf ("converted '%s' (%s) -> '%s' (%s)\n", in_org, fromcode, *out, tocode); + else + debug_logprintf ("logging suppressed, strings may contain password\n"); + } + return false; +} +#else +static bool +do_conversion (const char *tocode _GL_UNUSED, const char *fromcode _GL_UNUSED, + char const *in_org _GL_UNUSED, size_t inlen _GL_UNUSED, char **out) +{ + *out = NULL; + return false; +} +#endif + +/* Try converting string str from locale to UTF-8. Return a new string + on success, or str on error or if conversion isn't needed. */ +const char * +locale_to_utf8 (const char *str) +{ + char *new; + + /* That shouldn't happen, just in case */ + if (!opt.locale) + { + logprintf (LOG_VERBOSE, _("locale_to_utf8: locale is unset\n")); + opt.locale = find_locale (); + } + + if (!opt.locale || !c_strcasecmp (opt.locale, "utf-8")) + return str; + + if (do_conversion ("UTF-8", opt.locale, (char *) str, strlen ((char *) str), &new)) + return (const char *) new; + + xfree (new); + return str; +} + +/* Try to "ASCII encode" UTF-8 host. Return the new domain on success or NULL + on error. */ +char * +idn_encode (const struct iri *i, const char *host) +{ + int ret; + char *ascii_encoded; + char *utf8_encoded = NULL; + const char *src; +#if IDN2_VERSION_NUMBER < 0x00140000 + uint8_t *lower; + size_t len = 0; +#endif + + /* Encode to UTF-8 if not done */ + if (!i->utf8_encode) + { + if (!remote_to_utf8 (i, host, &utf8_encoded)) + return NULL; /* Nothing to encode or an error occurred */ + src = utf8_encoded; + } + else + src = host; + +#if IDN2_VERSION_NUMBER >= 0x00140000 + /* IDN2_TRANSITIONAL implies input NFC encoding */ + ret = idn2_lookup_u8 ((uint8_t *) src, (uint8_t **) &ascii_encoded, IDN2_NONTRANSITIONAL); + if (ret != IDN2_OK) + /* fall back to TR46 Transitional mode, max IDNA2003 compatibility */ + ret = idn2_lookup_u8 ((uint8_t *) src, (uint8_t **) &ascii_encoded, IDN2_TRANSITIONAL); + + if (ret != IDN2_OK) + logprintf (LOG_VERBOSE, _("idn_encode failed (%d): %s\n"), ret, + quote (idn2_strerror (ret))); +#else + /* we need a conversion to lowercase */ + lower = u8_tolower ((uint8_t *) src, u8_strlen ((uint8_t *) src) + 1, 0, UNINORM_NFKC, NULL, &len); + if (!lower) + { + logprintf (LOG_VERBOSE, _("Failed to convert to lower: %d: %s\n"), + errno, quote (src)); + xfree (utf8_encoded); + return NULL; + } + + if ((ret = idn2_lookup_u8 (lower, (uint8_t **) &ascii_encoded, IDN2_NFC_INPUT)) != IDN2_OK) + { + logprintf (LOG_VERBOSE, _("idn_encode failed (%d): %s\n"), ret, + quote (idn2_strerror (ret))); + } + + xfree (lower); +#endif + + xfree (utf8_encoded); + + if (ret == IDN2_OK && ascii_encoded) + { + char *tmp = xstrdup (ascii_encoded); + idn2_free (ascii_encoded); + ascii_encoded = tmp; + } + + return ret == IDN2_OK ? ascii_encoded : NULL; +} + +/* Try to decode an "ASCII encoded" host. Return the new domain in the locale + on success or NULL on error. */ +char * +idn_decode (const char *host) +{ +/* + char *new; + int ret; + + ret = idn2_register_u8 (NULL, host, (uint8_t **) &new, 0); + if (ret != IDN2_OK) + { + logprintf (LOG_VERBOSE, _("idn2_register_u8 failed (%d): %s: %s\n"), ret, + quote (idn2_strerror (ret)), host); + return NULL; + } + + return new; +*/ + /* idn2_register_u8() just works label by label. + * That is pretty much overhead for just displaying the original ulabels. + * To keep at least the debug output format, return a cloned host. */ + return xstrdup(host); +} + +/* Try to transcode string str from remote encoding to UTF-8. On success, *new + contains the transcoded string. *new content is unspecified otherwise. */ +bool +remote_to_utf8 (const struct iri *iri, const char *str, char **new) +{ + bool ret = false; + + if (!iri->uri_encoding) + return false; + + /* When `i->uri_encoding' == "UTF-8" there is nothing to convert. But we must + test for non-ASCII symbols for correct hostname processing in `idn_encode' + function. */ + if (!c_strcasecmp (iri->uri_encoding, "UTF-8")) + { + const unsigned char *p; + for (p = (unsigned char *) str; *p; p++) + if (*p > 127) + { + *new = strdup (str); + return true; + } + return false; + } + + if (do_conversion ("UTF-8", iri->uri_encoding, str, strlen (str), new)) + ret = true; + + /* Test if something was converted */ + if (*new && !strcmp (str, *new)) + { + xfree (*new); + return false; + } + + return ret; +} + +/* Allocate a new iri structure and return a pointer to it. */ +struct iri * +iri_new (void) +{ + struct iri *i = xmalloc (sizeof *i); + i->uri_encoding = opt.encoding_remote ? xstrdup (opt.encoding_remote) : NULL; + i->content_encoding = NULL; + i->orig_url = NULL; + i->utf8_encode = opt.enable_iri; + return i; +} + +struct iri *iri_dup (const struct iri *src) +{ + struct iri *i = xmalloc (sizeof *i); + i->uri_encoding = src->uri_encoding ? xstrdup (src->uri_encoding) : NULL; + i->content_encoding = (src->content_encoding ? + xstrdup (src->content_encoding) : NULL); + i->orig_url = src->orig_url ? xstrdup (src->orig_url) : NULL; + i->utf8_encode = src->utf8_encode; + return i; +} + +/* Completely free an iri structure. */ +void +iri_free (struct iri *i) +{ + if (i) + { + xfree (i->uri_encoding); + xfree (i->content_encoding); + xfree (i->orig_url); + xfree (i); + } +} + +/* Set uri_encoding of struct iri i. If a remote encoding was specified, use + it unless force is true. */ +void +set_uri_encoding (struct iri *i, const char *charset, bool force) +{ + DEBUGP (("URI encoding = %s\n", charset ? quote (charset) : "None")); + if (!force && opt.encoding_remote) + return; + if (i->uri_encoding) + { + if (charset && !c_strcasecmp (i->uri_encoding, charset)) + return; + xfree (i->uri_encoding); + } + + i->uri_encoding = charset ? xstrdup (charset) : NULL; +} + +/* Set content_encoding of struct iri i. */ +void +set_content_encoding (struct iri *i, const char *charset) +{ + DEBUGP (("URI content encoding = %s\n", charset ? quote (charset) : "None")); + if (opt.encoding_remote) + return; + if (i->content_encoding) + { + if (charset && !c_strcasecmp (i->content_encoding, charset)) + return; + xfree (i->content_encoding); + } + + i->content_encoding = charset ? xstrdup (charset) : NULL; +} |