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Diffstat (limited to '')
| -rw-r--r-- | src/lib/uri-util.c | 1332 |
1 files changed, 1332 insertions, 0 deletions
diff --git a/src/lib/uri-util.c b/src/lib/uri-util.c new file mode 100644 index 0000000..498bc88 --- /dev/null +++ b/src/lib/uri-util.c @@ -0,0 +1,1332 @@ +/* Copyright (c) 2010-2018 Dovecot authors, see the included COPYING file */ + +#include "lib.h" +#include "array.h" +#include "str.h" +#include "net.h" +#include "uri-util.h" + +#include <ctype.h> + +/* [URI-GEN] RFC3986 Appendix A: + + URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ] + absolute-URI = scheme ":" hier-part [ "?" query ] + scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) + + URI-reference = URI / relative-ref + relative-ref = relative-part [ "?" query ] [ "#" fragment ] + + relative-part = "//" authority path-abempty + / path-absolute + / path-noscheme + / path-empty + hier-part = "//" authority path-abempty + / path-absolute + / path-rootless + / path-empty + + authority = [ userinfo "@" ] host [ ":" port ] + userinfo = *( unreserved / pct-encoded / sub-delims / ":" ) + host = IP-literal / IPv4address / reg-name + port = *DIGIT + + IP-literal = "[" ( IPv6address / IPvFuture ) "]" + IPvFuture = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" ) + IPv6address = 6( h16 ":" ) ls32 + / "::" 5( h16 ":" ) ls32 + / [ h16 ] "::" 4( h16 ":" ) ls32 + / [ *1( h16 ":" ) h16 ] "::" 3( h16 ":" ) ls32 + / [ *2( h16 ":" ) h16 ] "::" 2( h16 ":" ) ls32 + / [ *3( h16 ":" ) h16 ] "::" h16 ":" ls32 + / [ *4( h16 ":" ) h16 ] "::" ls32 + / [ *5( h16 ":" ) h16 ] "::" h16 + / [ *6( h16 ":" ) h16 ] "::" + h16 = 1*4HEXDIG + ls32 = ( h16 ":" h16 ) / IPv4address + IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet + dec-octet = DIGIT ; 0-9 + / %x31-39 DIGIT ; 10-99 + / "1" 2DIGIT ; 100-199 + / "2" %x30-34 DIGIT ; 200-249 + / "25" %x30-35 ; 250-255 + reg-name = *( unreserved / pct-encoded / sub-delims ) + + path = path-abempty ; begins with "/" or is empty + / path-absolute ; begins with "/" but not "//" + / path-noscheme ; begins with a non-colon segment + / path-rootless ; begins with a segment + / path-empty ; zero characters + path-abempty = *( "/" segment ) + path-absolute = "/" [ segment-nz *( "/" segment ) ] + path-noscheme = segment-nz-nc *( "/" segment ) + path-rootless = segment-nz *( "/" segment ) + path-empty = 0<pchar> + + segment = *pchar + segment-nz = 1*pchar + segment-nz-nc = 1*( unreserved / pct-encoded / sub-delims / "@" ) + ; non-zero-length segment without any colon ":" + pchar = unreserved / pct-encoded / sub-delims / ":" / "@" + + query = *( pchar / "/" / "?" ) + fragment = *( pchar / "/" / "?" ) + + pct-encoded = "%" HEXDIG HEXDIG + unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~" + reserved = gen-delims / sub-delims + gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@" + sub-delims = "!" / "$" / "&" / "'" / "(" / ")" + / "*" / "+" / "," / ";" / "=" + */ + +#define URI_MAX_SCHEME_NAME_LEN 64 + +/* Character lookup table + * + * unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~" [bit0] + * sub-delims = "!" / "$" / "&" / "'" / "(" / ")" + * / "*" / "+" / "," / ";" / "=" [bit1] + * gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@" [bit2] + * pchar = unreserved / sub-delims / ":" / "@" [bit0|bit1|bit3] + * 'pfchar' = unreserved / sub-delims / ":" / "@" / "/" + * [bit0|bit1|bit3|bit5] + * 'uchar' = unreserved / sub-delims / ":" [bit0|bit1|bit4] + * 'qchar' = pchar / "/" / "?" [bit0|bit1|bit3|bit5|bit6] + * + */ + +#define CHAR_MASK_UNRESERVED (1<<0) +#define CHAR_MASK_SUB_DELIMS (1<<1) +#define CHAR_MASK_PCHAR ((1<<0)|(1<<1)|(1<<3)) +#define CHAR_MASK_PFCHAR ((1<<0)|(1<<1)|(1<<3)|(1<<5)) +#define CHAR_MASK_UCHAR ((1<<0)|(1<<1)|(1<<4)) +#define CHAR_MASK_QCHAR ((1<<0)|(1<<1)|(1<<3)|(1<<5)|(1<<6)) +#define CHAR_MASK_UNRESERVED_PATH ((1<<0)|(1<<5)) + +static unsigned const char _uri_char_lookup[256] = { + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 00 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 10 + 0, 2, 0, 4, 2, 0, 2, 2, 2, 2, 2, 2, 2, 1, 1, 36, // 20 + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 28, 2, 0, 2, 0, 68, // 30 + 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 40 + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 0, 4, 0, 1, // 50 + 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 60 + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, // 70 +}; + +static inline int _decode_hex_digit(const unsigned char digit) +{ + switch (digit) { + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + return digit - '0'; + + case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': + return digit - 'a' + 0x0a; + + case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': + return digit - 'A' + 0x0A; + } + return -1; +} + +static int +uri_parse_pct_encoded_data(struct uri_parser *parser, + const unsigned char **p, const unsigned char *pend, + unsigned char *ch_r) ATTR_NULL(3) +{ + int value; + + if (**p != '%' || (pend != NULL && *p >= pend)) + return 0; + *p += 1; + + if (**p == 0 || *(*p+1) == 0 || (pend != NULL && *p+1 >= pend)) { + parser->error = "Unexpected URI boundary after '%'"; + return -1; + } + + if ((value = _decode_hex_digit(**p)) < 0) { + parser->error = p_strdup_printf(parser->pool, + "Expecting hex digit after '%%', but found '%c'", **p); + return -1; + } + + *ch_r = (value & 0x0f) << 4; + *p += 1; + + if ((value = _decode_hex_digit(**p)) < 0) { + parser->error = p_strdup_printf(parser->pool, + "Expecting hex digit after '%%%c', but found '%c'", *((*p)-1), **p); + return -1; + } + + *ch_r |= (value & 0x0f); + *p += 1; + + if (!parser->allow_pct_nul && *ch_r == '\0') { + parser->error = + "Percent encoding is not allowed to encode NUL character"; + return -1; + } + return 1; +} + +int uri_parse_pct_encoded(struct uri_parser *parser, + unsigned char *ch_r) +{ + return uri_parse_pct_encoded_data + (parser, &parser->cur, parser->end, ch_r); +} + +static int +uri_parse_unreserved_char(struct uri_parser *parser, unsigned char *ch_r) +{ + if ((*parser->cur & 0x80) != 0) + return 0; + + if ((_uri_char_lookup[*parser->cur] & CHAR_MASK_UNRESERVED) != 0) { + *ch_r = *parser->cur; + parser->cur++; + return 1; + } + return 0; +} + +int uri_parse_unreserved(struct uri_parser *parser, string_t *part) +{ + int len = 0; + + while (parser->cur < parser->end) { + int ret; + unsigned char ch = 0; + + if ((ret = uri_parse_unreserved_char(parser, &ch)) < 0) + return -1; + if (ret == 0) + break; + + if (part != NULL) + str_append_c(part, ch); + len++; + } + + return len > 0 ? 1 : 0; +} + +int uri_parse_unreserved_pct(struct uri_parser *parser, string_t *part) +{ + int len = 0; + + while (parser->cur < parser->end) { + int ret; + unsigned char ch = 0; + + if ((ret=uri_parse_pct_encoded(parser, &ch)) < 0) + return -1; + else if (ret == 0 && + (ret=uri_parse_unreserved_char(parser, &ch)) < 0) + return -1; + if (ret == 0) + break; + + if (part != NULL) + str_append_c(part, ch); + len++; + } + + return len > 0 ? 1 : 0; +} + +bool uri_data_decode(struct uri_parser *parser, const char *data, + const char *until, const char **decoded_r) +{ + const unsigned char *p = (const unsigned char *)data; + const unsigned char *pend = (const unsigned char *)until; + string_t *decoded; + int ret; + + if (pend == NULL) { + /* NULL means unlimited; solely rely on '\0' */ + pend = (const unsigned char *)SIZE_MAX; + } + + if (p >= pend || *p == '\0') { + if (decoded_r != NULL) + *decoded_r = ""; + return TRUE; + } + + decoded = uri_parser_get_tmpbuf(parser, 256); + while (p < pend && *p != '\0') { + unsigned char ch; + + if ((ret=uri_parse_pct_encoded_data + (parser, &p, NULL, &ch)) != 0) { + if (ret < 0) + return FALSE; + str_append_c(decoded, ch); + } else { + str_append_c(decoded, *p); + p++; + } + } + + if (decoded_r != NULL) + *decoded_r = p_strdup(parser->pool, str_c(decoded)); + return TRUE; +} + +int uri_parse_scheme(struct uri_parser *parser, const char **scheme_r) +{ + const unsigned char *first = parser->cur; + size_t len = 1; + + /* RFC 3968: + * scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) + */ + + if (parser->cur >= parser->end || !i_isalpha(*parser->cur)) + return 0; + parser->cur++; + + while (len < URI_MAX_SCHEME_NAME_LEN && + parser->cur < parser->end) { + if (!i_isalnum(*parser->cur) && + *parser->cur != '+' && *parser->cur != '-' && + *parser->cur != '.') + break; + parser->cur++; + len++; + } + + if (parser->cur >= parser->end || *parser->cur != ':') { + parser->error = "Invalid URI scheme"; + return -1; + } + if (scheme_r != NULL) + *scheme_r = t_strndup(first, parser->cur - first); + parser->cur++; + return 1; +} + +int uri_cut_scheme(const char **uri_p, const char **scheme_r) +{ + struct uri_parser parser; + + uri_parser_init(&parser, NULL, *uri_p); + if (uri_parse_scheme(&parser, scheme_r) <= 0) + return -1; + *uri_p = (const char *)parser.cur; + return 0; +} + +static int +uri_parse_dec_octet(struct uri_parser *parser, string_t *literal, + uint8_t *octet_r) ATTR_NULL(2) +{ + unsigned int octet = 0; + int count = 0; + + /* RFC 3986: + * + * dec-octet = DIGIT ; 0-9 + * / %x31-39 DIGIT ; 10-99 + * / "1" 2DIGIT ; 100-199 + * / "2" %x30-34 DIGIT ; 200-249 + * / "25" %x30-35 ; 250-255 + */ + + while (parser->cur < parser->end && i_isdigit(*parser->cur)) { + octet = octet * 10 + (parser->cur[0] - '0'); + if (octet > 255) + return -1; + + if (literal != NULL) + str_append_c(literal, *parser->cur); + + parser->cur++; + count++; + } + + if (count > 0) { + *octet_r = octet; + return 1; + } + return 0; +} + +static int +uri_parse_ipv4address(struct uri_parser *parser, string_t *literal, + struct in_addr *ip4_r) ATTR_NULL(2,3) +{ + uint8_t octet; + uint32_t ip = 0; + int ret; + int i; + + /* RFC 3986: + * + * IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet + */ + + if ((ret = uri_parse_dec_octet(parser, literal, &octet)) <= 0) + return ret; + ip = octet; + + for (i = 0; i < 3 && parser->cur < parser->end; i++) { + if (*parser->cur != '.') + return -1; + + if (literal != NULL) + str_append_c(literal, '.'); + parser->cur++; + + if (uri_parse_dec_octet(parser, literal, &octet) <= 0) + return -1; + ip = (ip << 8) + octet; + } + + if (ip4_r != NULL) + ip4_r->s_addr = htonl(ip); + return 1; +} + +static int +uri_do_parse_reg_name(struct uri_parser *parser, + string_t *reg_name) ATTR_NULL(2) +{ + /* RFC 3986: + * + * reg-name = *( unreserved / pct-encoded / sub-delims ) + */ + + while (parser->cur < parser->end) { + int ret; + unsigned char c; + + /* unreserved / pct-encoded */ + if ((ret=uri_parse_pct_encoded(parser, &c)) < 0) + return -1; + else if (ret == 0 && + (ret=uri_parse_unreserved_char(parser, &c)) < 0) + return -1; + + if (ret > 0) { + if (reg_name != NULL) + str_append_c(reg_name, c); + continue; + } + + /* sub-delims */ + c = *parser->cur; + if ((c & 0x80) == 0 && (_uri_char_lookup[c] & CHAR_MASK_SUB_DELIMS) != 0) { + if (reg_name != NULL) + str_append_c(reg_name, *parser->cur); + parser->cur++; + continue; + } + break; + } + return 0; +} + +int uri_parse_reg_name(struct uri_parser *parser, + const char **reg_name_r) +{ + string_t *reg_name = NULL; + int ret; + + if (reg_name_r != NULL) + reg_name = uri_parser_get_tmpbuf(parser, 256); + + if ((ret=uri_do_parse_reg_name(parser, reg_name)) <= 0) + return ret; + + if (reg_name_r != NULL) + *reg_name_r = str_c(reg_name); + return 1; +} + +static int uri_do_parse_host_name(struct uri_parser *parser, + string_t *host_name) ATTR_NULL(2) +{ + const unsigned char *first, *part; + int ret; + + /* RFC 3986, Section 3.2.2: + + A registered name intended for lookup in the DNS uses the syntax + defined in Section 3.5 of [RFC1034] and Section 2.1 of [RFC1123]. + Such a name consists of a sequence of domain labels separated by ".", + each domain label starting and ending with an alphanumeric character + and possibly also containing "-" characters. The rightmost domain + label of a fully qualified domain name in DNS may be followed by a + single "." and should be if it is necessary to distinguish between + the complete domain name and some local domain. + + RFC 2396, Section 3.2.2 (old URI specification): + + hostname = *( domainlabel "." ) toplabel [ "." ] + domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum + toplabel = alpha | alpha *( alphanum | "-" ) alphanum + + The description in RFC 3986 is more liberal, so: + + hostname = *( domainlabel "." ) domainlabel [ "." ] + domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum + + We also support percent encoding in spirit of the generic reg-name, + even though this should explicitly not be used according to the RFC. + It is, however, not strictly forbidden (unlike older RFC), so we + support it. + */ + + first = part = parser->cur; + for (;;) { + const unsigned char *offset; + unsigned char ch, pch; + + /* alphanum */ + offset = parser->cur; + ch = pch = *parser->cur; + if (parser->cur >= parser->end) + break; + if ((ret=uri_parse_pct_encoded(parser, &ch)) < 0) { + return -1; + } else if (ret > 0) { + if (!i_isalnum(ch)) + return -1; + if (host_name != NULL) + str_append_c(host_name, ch); + part = parser->cur; + } else { + if (!i_isalnum(*parser->cur)) + break; + parser->cur++; + } + + if (parser->cur < parser->end) { + /* *( alphanum | "-" ) alphanum */ + do { + offset = parser->cur; + + if ((ret=uri_parse_pct_encoded(parser, &ch)) < 0) { + return -1; + } else if (ret > 0) { + if (!i_isalnum(ch) && ch != '-') + break; + if (host_name != NULL) { + if (offset > part) + str_append_data(host_name, part, offset - part); + str_append_c(host_name, ch); + } + part = parser->cur; + } else { + ch = *parser->cur; + if (!i_isalnum(ch) && ch != '-') + break; + parser->cur++; + } + pch = ch; + } while (parser->cur < parser->end); + + if (!i_isalnum(pch)) { + parser->error = "Invalid domain label in hostname"; + return -1; + } + } + + if (host_name != NULL && parser->cur > part) + str_append_data(host_name, part, parser->cur - part); + + /* "." */ + if (parser->cur >= parser->end || ch != '.') + break; + if (host_name != NULL) + str_append_c(host_name, '.'); + if (parser->cur == offset) + parser->cur++; + part = parser->cur; + } + + if (parser->cur == first) + return 0; + + /* remove trailing '.' */ + if (host_name != NULL) { + const char *name = str_c(host_name); + + i_assert(str_len(host_name) > 0); + if (name[str_len(host_name)-1] == '.') + str_truncate(host_name, str_len(host_name)-1); + } + return 1; +} + +int uri_parse_host_name(struct uri_parser *parser, + const char **host_name_r) +{ + string_t *host_name = NULL; + int ret; + + if (host_name_r != NULL) + host_name = uri_parser_get_tmpbuf(parser, 256); + + if ((ret=uri_do_parse_host_name(parser, host_name)) <= 0) + return ret; + + if (host_name_r != NULL) + *host_name_r = str_c(host_name); + return 1; +} + +static int +uri_parse_ip_literal(struct uri_parser *parser, string_t *literal, + struct in6_addr *ip6_r) ATTR_NULL(2,3) +{ + const unsigned char *p; + const char *address; + struct in6_addr ip6; + + /* IP-literal = "[" ( IPv6address / IPvFuture ) "]" + * IPvFuture = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" ) + * IPv6address = ; Syntax not relevant: parsed using inet_pton() + */ + + /* "[" already verified */ + + /* Scan for end of address */ + for (p = parser->cur+1; p < parser->end; p++) { + if (*p == ']') + break; + } + + if (p >= parser->end || *p != ']') { + parser->error = "Expecting ']' at end of IP-literal"; + return -1; + } + + if (literal != NULL) + str_append_data(literal, parser->cur, p-parser->cur+1); + address = t_strdup_until(parser->cur+1, p); + parser->cur = p + 1; + + if (*address == '\0') { + parser->error = "Empty IPv6 host address"; + return -1; + } + if (*address == 'v') { + parser->error = p_strdup_printf(parser->pool, + "Future IP host address '%s' not supported", address); + return -1; + } + if (inet_pton(AF_INET6, address, &ip6) <= 0) { + parser->error = p_strdup_printf(parser->pool, + "Invalid IPv6 host address '%s'", address); + return -1; + } + if (ip6_r != NULL) + *ip6_r = ip6; + return 1; +} + +static int +uri_do_parse_host(struct uri_parser *parser, + struct uri_host *host, bool host_name) + ATTR_NULL(2) +{ + const unsigned char *preserve; + struct in_addr ip4; + struct in6_addr ip6; + string_t *literal = NULL; + int ret; + + /* RFC 3986: + * + * host = IP-literal / IPv4address / reg-name + */ + + if (host != NULL) + i_zero(host); + + literal = uri_parser_get_tmpbuf(parser, 256); + + /* IP-literal / */ + if (parser->cur < parser->end && *parser->cur == '[') { + if (uri_parse_ip_literal(parser, literal, &ip6) <= 0) + return -1; + + if (host != NULL) { + host->name = p_strdup(parser->pool, str_c(literal));; + host->ip.family = AF_INET6; + host->ip.u.ip6 = ip6; + } + return 1; + } + + /* IPv4address / + * + * If it fails to parse, we try to parse it as a reg-name + */ + preserve = parser->cur; + if ((ret = uri_parse_ipv4address(parser, literal, &ip4)) > 0) { + if (host != NULL) { + host->name = p_strdup(parser->pool, str_c(literal)); + host->ip.family = AF_INET; + host->ip.u.ip4 = ip4; + } + return ret; + } + parser->cur = preserve; + str_truncate(literal, 0); + + /* reg-name */ + if (host_name) { + if (uri_do_parse_host_name(parser, literal) < 0) + return -1; + } else if (uri_do_parse_reg_name(parser, literal) < 0) + return -1; + if (host != NULL) + host->name = p_strdup(parser->pool, str_c(literal)); + return 0; +} + +int uri_parse_host(struct uri_parser *parser, + struct uri_host *host) +{ + return uri_do_parse_host(parser, host, TRUE); +} + +static int +uri_parse_port(struct uri_parser *parser, + struct uri_authority *auth) ATTR_NULL(2) +{ + const unsigned char *first; + in_port_t port; + + /* RFC 3986: + * + * port = *DIGIT + */ + + first = parser->cur; + while (parser->cur < parser->end && i_isdigit(*parser->cur)) + parser->cur++; + + if (parser->cur == first) + return 0; + if (net_str2port(t_strdup_until(first, parser->cur), &port) < 0) { + parser->error = "Invalid port number"; + return -1; + } + + if (auth != NULL) + auth->port = port; + return 1; +} + +static int +uri_do_parse_authority(struct uri_parser *parser, + struct uri_authority *auth, bool host_name) ATTR_NULL(2) +{ + const unsigned char *p; + int ret; + + /* + * authority = [ userinfo "@" ] host [ ":" port ] + */ + + if (auth != NULL) + i_zero(auth); + + /* Scan ahead to check whether there is a [userinfo "@"] uri component */ + for (p = parser->cur; p < parser->end; p++){ + /* refuse 8bit characters */ + if ((*p & 0x80) != 0) + break; + + /* break at first delimiter */ + if (*p != '%' && (_uri_char_lookup[*p] & CHAR_MASK_UCHAR) == 0) + break; + } + + /* Extract userinfo */ + if (p < parser->end && *p == '@') { + if (auth != NULL) + auth->enc_userinfo = p_strdup_until(parser->pool, parser->cur, p); + parser->cur = p+1; + } + + /* host */ + if (uri_do_parse_host(parser, + (auth == NULL ? NULL : &auth->host), host_name) < 0) + return -1; + if (parser->cur == parser->end) + return 1; + switch (*parser->cur) { + case ':': case '/': case '?': case '#': + break; + default: + parser->error = "Invalid host identifier"; + return -1; + } + + /* [":" port] */ + if (*parser->cur == ':') { + parser->cur++; + + if ((ret = uri_parse_port(parser, auth)) < 0) + return ret; + if (parser->cur == parser->end) + return 1; + switch (*parser->cur) { + case '/': case '?': case '#': + break; + default: + parser->error = "Invalid host port"; + return -1; + } + } + + return 1; +} + +static int +uri_do_parse_slashslash_authority(struct uri_parser *parser, + struct uri_authority *auth, bool host_name) + ATTR_NULL(2) +{ + /* "//" authority */ + + if ((parser->end - parser->cur) <= 2 || parser->cur[0] != '/' || + parser->cur[1] != '/') + return 0; + + parser->cur += 2; + return uri_do_parse_authority(parser, auth, host_name); +} + +int uri_parse_authority(struct uri_parser *parser, + struct uri_authority *auth) +{ + return uri_do_parse_authority(parser, auth, FALSE); +} + +int uri_parse_slashslash_authority(struct uri_parser *parser, + struct uri_authority *auth) +{ + return uri_do_parse_slashslash_authority(parser, auth, FALSE); +} + +int uri_parse_host_authority(struct uri_parser *parser, + struct uri_authority *auth) +{ + return uri_do_parse_authority(parser, auth, TRUE); +} + +int uri_parse_slashslash_host_authority(struct uri_parser *parser, + struct uri_authority *auth) +{ + return uri_do_parse_slashslash_authority(parser, auth, TRUE); +} + +int uri_parse_path_segment(struct uri_parser *parser, const char **segment_r) +{ + const unsigned char *first = parser->cur; + int ret; + + while (parser->cur < parser->end) { + if (*parser->cur == '%') { + unsigned char ch = 0; + if ((ret=uri_parse_pct_encoded(parser, &ch)) < 0) + return -1; + if (ret > 0) + continue; + } + + if ((*parser->cur & 0x80) != 0 || + (_uri_char_lookup[*parser->cur] & CHAR_MASK_PCHAR) == 0) + break; + + parser->cur++; + } + + if (parser->cur < parser->end && + *parser->cur != '/' && *parser->cur != '?' && *parser->cur != '#' ) { + parser->error = + "Path component contains invalid character"; + return -1; + } + + if (first == parser->cur) + return 0; + + if (segment_r != NULL) + *segment_r = p_strdup_until(parser->pool, first, parser->cur); + return 1; +} + +int uri_parse_path(struct uri_parser *parser, + int *relative_r, const char *const **path_r) +{ + const unsigned char *pbegin = parser->cur; + ARRAY_TYPE(const_string) segments; + const char *segment = NULL; + unsigned int count; + int relative = 1; + int ret; + + count = 0; + if (path_r != NULL) + p_array_init(&segments, parser->pool, 16); + else + i_zero(&segments); + + /* check for a leading '/' and indicate absolute path + when it is present + */ + if (parser->cur < parser->end && *parser->cur == '/') { + parser->cur++; + relative = 0; + } + + /* parse first segment */ + if ((ret = uri_parse_path_segment(parser, &segment)) < 0) + return -1; + + for (;;) { + if (ret > 0) { + /* strip dot segments */ + if (segment[0] == '.') { + if (segment[1] == '.') { + if (segment[2] == '\0') { + /* '..' -> skip and... */ + segment = NULL; + + /* ... pop last segment (if any) */ + if (count > 0) { + if (path_r != NULL) { + i_assert(count == array_count(&segments)); + array_delete(&segments, count-1, 1); + } + count--; + } else if ( relative > 0 ) { + relative++; + } + } + } else if (segment[1] == '\0') { + /* '.' -> skip */ + segment = NULL; + } + } + } else { + segment = ""; + } + + if (segment != NULL) { + if (path_r != NULL) + array_push_back(&segments, &segment); + count++; + } + + if (parser->cur >= parser->end || *parser->cur != '/') + break; + parser->cur++; + + /* parse next path segment */ + if ((ret = uri_parse_path_segment(parser, &segment)) < 0) + return -1; + } + + if (relative_r != NULL) + *relative_r = relative; + if (path_r != NULL) + *path_r = NULL; + + if (parser->cur == pbegin) { + /* path part of URI is empty */ + return 0; + } + + if (path_r != NULL) { + /* special treatment for a trailing '..' or '.' */ + if (segment == NULL) { + segment = ""; + array_push_back(&segments, &segment); + } + array_append_zero(&segments); + *path_r = array_get(&segments, &count); + } + if (parser->cur < parser->end && + *parser->cur != '?' && *parser->cur != '#') { + parser->error = "Path component contains invalid character"; + return -1; + } + return 1; +} + +int uri_parse_query(struct uri_parser *parser, const char **query_r) +{ + const unsigned char *first = parser->cur; + int ret; + + /* RFC 3986: + * + * URI = { ... } [ "?" query ] { ... } + * query = *( pchar / "/" / "?" ) + * pchar = unreserved / pct-encoded / sub-delims / ":" / "@" + */ + if (parser->cur >= parser->end || *parser->cur != '?') + return 0; + parser->cur++; + + while (parser->cur < parser->end) { + if (*parser->cur == '%') { + unsigned char ch = 0; + if ((ret=uri_parse_pct_encoded(parser, &ch)) < 0) + return -1; + if (ret > 0) + continue; + } + + if ((*parser->cur & 0x80) != 0 || + (_uri_char_lookup[*parser->cur] & CHAR_MASK_QCHAR) == 0) + break; + parser->cur++; + } + + if (parser->cur < parser->end && *parser->cur != '#') { + parser->error = "Query component contains invalid character"; + return -1; + } + + if (query_r != NULL) + *query_r = p_strdup_until(parser->pool, first+1, parser->cur); + return 1; +} + +int uri_parse_fragment(struct uri_parser *parser, const char **fragment_r) +{ + const unsigned char *first = parser->cur; + int ret; + + /* RFC 3986: + * + * URI = { ... } [ "#" fragment ] + * fragment = *( pchar / "/" / "?" ) + * pchar = unreserved / pct-encoded / sub-delims / ":" / "@" + */ + + if (parser->cur >= parser->end || *parser->cur != '#') + return 0; + parser->cur++; + + while (parser->cur < parser->end) { + if (*parser->cur == '%') { + unsigned char ch = 0; + if ((ret=uri_parse_pct_encoded(parser, &ch)) < 0) + return -1; + if (ret > 0) + continue; + } + + if ((*parser->cur & 0x80) != 0 || + (_uri_char_lookup[*parser->cur] & CHAR_MASK_QCHAR) == 0) + break; + parser->cur++; + } + + if (parser->cur < parser->end) { + parser->error = "Fragment component contains invalid character"; + return -1; + } + + if (fragment_r != NULL) + *fragment_r = p_strdup_until(parser->pool, first+1, parser->cur); + return 1; +} + +void uri_parser_init_data(struct uri_parser *parser, + pool_t pool, const unsigned char *data, size_t size) +{ + i_zero(parser); + parser->pool = pool; + parser->begin = parser->cur = data; + parser->end = data + size; +} + +void uri_parser_init(struct uri_parser *parser, + pool_t pool, const char *uri) +{ + uri_parser_init_data + (parser, pool, (const unsigned char *)uri, strlen(uri)); +} + +string_t *uri_parser_get_tmpbuf(struct uri_parser *parser, size_t size) +{ + if (parser->tmpbuf == NULL) + parser->tmpbuf = str_new(parser->pool, size); + else + str_truncate(parser->tmpbuf, 0); + return parser->tmpbuf; +} + +int uri_parse_absolute_generic(struct uri_parser *parser, + enum uri_parse_flags flags) +{ + int relative, aret, ret = 0; + + /* + URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ] + + hier-part = "//" authority path-abempty + / path-absolute + / path-rootless + / path-empty + path-abempty = *( "/" segment ) + path-absolute = "/" [ segment-nz *( "/" segment ) ] + path-rootless = segment-nz *( "/" segment ) + path-empty = 0<pchar> + + segment = *pchar + segment-nz = 1*pchar + */ + + /* scheme ":" */ + if ((flags & URI_PARSE_SCHEME_EXTERNAL) == 0 && + (ret=uri_parse_scheme(parser, NULL)) <= 0) { + if (ret == 0) + parser->error = "Missing scheme"; + return -1; + } + + /* "//" authority */ + if ((aret=uri_parse_slashslash_authority + (parser, NULL)) < 0) + return -1; + + /* path-absolute / path-rootless / path-empty */ + if (aret == 0) { + ret = uri_parse_path(parser, &relative, NULL); + /* path-abempty */ + } else if (parser->cur < parser->end && *parser->cur == '/') { + ret = uri_parse_path(parser, &relative, NULL); + i_assert(ret <= 0 || relative == 0); + } + if (ret < 0) + return -1; + + /* [ "?" query ] */ + if (uri_parse_query(parser, NULL) < 0) + return -1; + + /* [ "#" fragment ] */ + if ((ret=uri_parse_fragment(parser, NULL)) < 0) + return ret; + if (ret > 0 && (flags & URI_PARSE_ALLOW_FRAGMENT_PART) == 0) { + parser->error = "Fragment part not allowed"; + return -1; + } + + i_assert(parser->cur == parser->end); + return 0; +} + +/* + * Generic URI manipulation + */ + +void uri_host_copy(pool_t pool, struct uri_host *dest, + const struct uri_host *src) +{ + const char *host_name = src->name; + + /* create host name literal if caller is lazy */ + if (host_name == NULL && src->ip.family != 0) { + host_name = net_ip2addr(&src->ip); + i_assert(*host_name != '\0'); + } + + *dest = *src; + dest->name = p_strdup(pool, host_name); +} + +/* + * Check generic URI + */ + +int uri_check_data(const unsigned char *data, size_t size, + enum uri_parse_flags flags, const char **error_r) +{ + struct uri_parser parser; + int ret; + + i_zero(&parser); + parser.pool = pool_datastack_create(); + parser.begin = parser.cur = data; + parser.end = data + size; + + ret = uri_parse_absolute_generic(&parser, flags); + *error_r = parser.error; + return ret; +} + +int uri_check(const char *uri, enum uri_parse_flags flags, + const char **error_r) +{ + return uri_check_data + ((const unsigned char *)uri, strlen(uri), flags, error_r); +} + +/* + * Generic URI construction + */ + +void uri_data_encode(string_t *out, + const unsigned char esc_table[256], + unsigned char esc_mask, const char *esc_extra, + const char *data) +{ + const unsigned char *pbegin, *p; + + pbegin = p = (const unsigned char *)data; + while (*p != '\0') { + if ((*p & 0x80) != 0 || (esc_table[*p] & esc_mask) == 0 || + (esc_extra != NULL && strchr(esc_extra, (char)*p) != NULL)) { + if ((p - pbegin) > 0) + str_append_data(out, pbegin, p - pbegin); + str_printfa(out, "%%%02x", *p); + p++; + pbegin = p; + } else { + p++; + } + } + if ((p - pbegin) > 0) + str_append_data(out, pbegin, p - pbegin); +} + +void uri_append_scheme(string_t *out, const char *scheme) +{ + str_append(out, scheme); + str_append_c(out, ':'); +} + +void uri_append_user_data(string_t *out, const char *esc, + const char *data) +{ + uri_data_encode(out, _uri_char_lookup, CHAR_MASK_UCHAR, esc, data); +} + +void uri_append_userinfo(string_t *out, const char *userinfo) +{ + uri_append_user_data(out, NULL, userinfo); + str_append_c(out, '@'); +} + +void uri_append_host_name(string_t *out, const char *name) +{ + uri_data_encode(out, _uri_char_lookup, + CHAR_MASK_UNRESERVED | CHAR_MASK_SUB_DELIMS, NULL, name); +} + +void uri_append_host_ip(string_t *out, const struct ip_addr *host_ip) +{ + const char *addr = net_ip2addr(host_ip); + + i_assert(host_ip->family != 0); + + if (host_ip->family == AF_INET) { + str_append(out, addr); + return; + } + + i_assert(host_ip->family == AF_INET6); + str_append_c(out, '['); + str_append(out, addr); + str_append_c(out, ']'); +} + +void uri_append_host(string_t *out, const struct uri_host *host) +{ + if (host->name != NULL) { + /* assume IPv6 literal if starts with '['; avoid encoding */ + if (*host->name == '[') + str_append(out, host->name); + else + uri_append_host_name(out, host->name); + } else + uri_append_host_ip(out, &host->ip); +} + +void uri_append_port(string_t *out, in_port_t port) +{ + if (port != 0) + str_printfa(out, ":%u", port); +} + +void uri_append_path_segment_data(string_t *out, const char *esc, + const char *data) +{ + uri_data_encode(out, _uri_char_lookup, CHAR_MASK_PCHAR, esc, data); +} + +void uri_append_path_segment(string_t *out, const char *segment) +{ + str_append_c(out, '/'); + if (*segment != '\0') + uri_append_path_data(out, NULL, segment); +} + +void uri_append_path_data(string_t *out, const char *esc, + const char *data) +{ + uri_data_encode(out, _uri_char_lookup, CHAR_MASK_PFCHAR, esc, data); +} + +void uri_append_path(string_t *out, const char *path) +{ + str_append_c(out, '/'); + if (*path != '\0') + uri_append_path_data(out, NULL, path); +} + +void uri_append_query_data(string_t *out, const char *esc, + const char *data) +{ + uri_data_encode(out, _uri_char_lookup, CHAR_MASK_QCHAR, esc, data); +} + +void uri_append_query(string_t *out, const char *query) +{ + str_append_c(out, '?'); + if (*query != '\0') + uri_append_query_data(out, NULL, query); +} + +void uri_append_fragment_data(string_t *out, const char *esc, + const char *data) +{ + uri_data_encode(out, _uri_char_lookup, CHAR_MASK_QCHAR, esc, data); +} + +void uri_append_fragment(string_t *out, const char *fragment) +{ + str_append_c(out, '#'); + if (*fragment != '\0') + uri_append_fragment_data(out, NULL, fragment); +} + +void uri_append_unreserved(string_t *out, const char *data) +{ + uri_data_encode(out, _uri_char_lookup, CHAR_MASK_UNRESERVED, + NULL, data); +} + +void uri_append_unreserved_path(string_t *out, const char *data) +{ + uri_data_encode(out, _uri_char_lookup, CHAR_MASK_UNRESERVED_PATH, + NULL, data); +} |