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Diffstat (limited to 'include/haproxy/http.h')
| -rw-r--r-- | include/haproxy/http.h | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/include/haproxy/http.h b/include/haproxy/http.h new file mode 100644 index 0000000..2992640 --- /dev/null +++ b/include/haproxy/http.h @@ -0,0 +1,222 @@ +/* + * include/haproxy/http.h + * + * Functions for version-agnostic and implementation-agnostic HTTP protocol. + * + * Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu + * + * This library 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, version 2.1 + * exclusively. + * + * This library 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 this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef _HAPROXY_HTTP_H +#define _HAPROXY_HTTP_H + +#include <string.h> +#include <import/ist.h> +#include <haproxy/api.h> +#include <haproxy/http-t.h> + +extern const int http_err_codes[HTTP_ERR_SIZE]; +extern const char *http_err_msgs[HTTP_ERR_SIZE]; +extern const struct ist http_known_methods[HTTP_METH_OTHER]; +extern const uint8_t http_char_classes[256]; + +enum http_meth_t find_http_meth(const char *str, const int len); +int http_get_status_idx(unsigned int status); +const char *http_get_reason(unsigned int status); +struct ist http_get_host_port(const struct ist host); +int http_is_default_port(const struct ist schm, const struct ist port); +int http_validate_scheme(const struct ist schm); +struct ist http_parse_scheme(struct http_uri_parser *parser); +struct ist http_parse_authority(struct http_uri_parser *parser, int no_userinfo); +struct ist http_parse_path(struct http_uri_parser *parser); +int http_parse_cont_len_header(struct ist *value, unsigned long long *body_len, + int not_first); +int http_header_match2(const char *hdr, const char *end, + const char *name, int len); +char *http_find_hdr_value_end(char *s, const char *e); +char *http_find_cookie_value_end(char *s, const char *e); +char *http_extract_cookie_value(char *hdr, const char *hdr_end, + char *cookie_name, size_t cookie_name_l, + int list, char **value, size_t *value_l); +char *http_extract_next_cookie_name(char *hdr_beg, char *hdr_end, int is_req, + char **ptr, size_t *len); +int http_parse_qvalue(const char *qvalue, const char **end); +const char *http_find_url_param_pos(const char **chunks, + const char* url_param_name, + size_t url_param_name_l, char delim, char insensitive); +int http_find_next_url_param(const char **chunks, + const char* url_param_name, size_t url_param_name_l, + const char **vstart, const char **vend, char delim, char insensitive); + +int http_parse_header(const struct ist hdr, struct ist *name, struct ist *value); +int http_parse_stline(const struct ist line, struct ist *p1, struct ist *p2, struct ist *p3); +int http_parse_status_val(const struct ist value, struct ist *status, struct ist *reason); + +int http_compare_etags(struct ist etag1, struct ist etag2); + +struct ist http_trim_leading_spht(struct ist value); +struct ist http_trim_trailing_spht(struct ist value); + +/* + * Given a path string and its length, find the position of beginning of the + * query string. Returns NULL if no query string is found in the path. + * + * Example: if path = "/foo/bar/fubar?yo=mama;ye=daddy", and n = 22: + * + * find_query_string(path, n, '?') points to "yo=mama;ye=daddy" string. + */ +static inline char *http_find_param_list(char *path, size_t path_l, char delim) +{ + char *p; + + p = memchr(path, delim, path_l); + return p ? p + 1 : NULL; +} + +static inline int http_is_param_delimiter(char c, char delim) +{ + return c == '&' || c == ';' || c == delim; +} + +/* Match language range with language tag. RFC2616 14.4: + * + * A language-range matches a language-tag if it exactly equals + * the tag, or if it exactly equals a prefix of the tag such + * that the first tag character following the prefix is "-". + * + * Return 1 if the strings match, else return 0. + */ +static inline int http_language_range_match(const char *range, int range_len, + const char *tag, int tag_len) +{ + const char *end = range + range_len; + const char *tend = tag + tag_len; + + while (range < end) { + if (*range == '-' && tag == tend) + return 1; + if (*range != *tag || tag == tend) + return 0; + range++; + tag++; + } + /* Return true only if the last char of the tag is matched. */ + return tag == tend; +} + +static inline enum http_etag_type http_get_etag_type(const struct ist etag) +{ + /* An ETag must be at least 2 characters. */ + if (etag.len < 2) + return ETAG_INVALID; + + /* The last character must be a `"`. */ + if (etag.ptr[etag.len - 1] != '"') + return ETAG_INVALID; + + /* If the ETag starts with a `"` then it is a strong ETag. */ + if (etag.ptr[0] == '"') + return ETAG_STRONG; + + /* If the ETag starts with `W/"` then it is a weak ETag. */ + if (istnmatch(etag, ist("W/\""), 3)) + return ETAG_WEAK; + + return ETAG_INVALID; +} + +/* Initialize a HTTP URI parser to use it with http URI parsing functions. The + * URI format is detected according to its first character. + */ +static inline struct http_uri_parser http_uri_parser_init(const struct ist uri) +{ + struct http_uri_parser parser = { + .uri = uri, + .state = URI_PARSER_STATE_BEFORE, + }; + + /* RFC7230, par. 2.7 : + * Request-URI = "*" | absuri | abspath | authority + */ + + if (!istlen(parser.uri)) { + parser.format = URI_PARSER_FORMAT_EMPTY; + } + else { + /* detect the format according to the first URI character */ + switch (*istptr(parser.uri)) { + case '*': + parser.format = URI_PARSER_FORMAT_ASTERISK; + break; + + case '/': + parser.format = URI_PARSER_FORMAT_ABSPATH; + break; + + default: + parser.format = URI_PARSER_FORMAT_ABSURI_OR_AUTHORITY; + break; + } + } + + return parser; +} + +/* Looks into <ist> for forbidden characters for header values (0x00, 0x0A, + * 0x0D), starting at pointer <start> which must be within <ist>. Returns + * non-zero if such a character is found, 0 otherwise. When run on unlikely + * header match, it's recommended to first check for the presence of control + * chars using ist_find_ctl(). + */ +static inline int http_header_has_forbidden_char(const struct ist ist, const char *start) +{ + do { + if ((uint8_t)*start <= 0x0d && + (1U << (uint8_t)*start) & ((1<<13) | (1<<10) | (1<<0))) + return 1; + start++; + } while (start < istend(ist)); + return 0; +} + +/* Looks into <ist> for forbidden characters for :path values (0x00..0x1F, + * 0x20, 0x23), starting at pointer <start> which must be within <ist>. + * Returns non-zero if such a character is found, 0 otherwise. When run on + * unlikely header match, it's recommended to first check for the presence + * of control chars using ist_find_ctl(). + */ +static inline int http_path_has_forbidden_char(const struct ist ist, const char *start) +{ + do { + if ((uint8_t)*start <= 0x23) { + if ((uint8_t)*start < 0x20) + return 1; + if ((1U << ((uint8_t)*start & 0x1F)) & ((1<<3) | (1<<0))) + return 1; + } + start++; + } while (start < istend(ist)); + return 0; +} + +#endif /* _HAPROXY_HTTP_H */ + +/* + * Local variables: + * c-indent-level: 8 + * c-basic-offset: 8 + * End: + */ |