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Diffstat (limited to 'include/haproxy/filters.h')
| -rw-r--r-- | include/haproxy/filters.h | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/include/haproxy/filters.h b/include/haproxy/filters.h new file mode 100644 index 0000000..4a32c21 --- /dev/null +++ b/include/haproxy/filters.h @@ -0,0 +1,187 @@ +/* + * include/haproxy/filters.h + * This file defines function prototypes for stream filters management. + * + * Copyright (C) 2015 Qualys Inc., Christopher Faulet <cfaulet@qualys.com> + * + * 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_FILTERS_H +#define _HAPROXY_FILTERS_H + +#include <haproxy/channel.h> +#include <haproxy/filters-t.h> +#include <haproxy/http_ana-t.h> +#include <haproxy/proxy-t.h> +#include <haproxy/stream-t.h> + +extern const char *trace_flt_id; +extern const char *http_comp_flt_id; +extern const char *cache_store_flt_id; +extern const char *spoe_filter_id; +extern const char *fcgi_flt_id; + +#define FLT_ID(flt) (flt)->config->id +#define FLT_CONF(flt) (flt)->config->conf +#define FLT_OPS(flt) (flt)->config->ops + +/* Useful macros to access per-channel values. It can be safely used inside + * filters. */ +#define CHN_IDX(chn) (((chn)->flags & CF_ISRESP) == CF_ISRESP) +#define FLT_STRM_OFF(s, chn) (strm_flt(s)->offset[CHN_IDX(chn)]) +#define FLT_OFF(flt, chn) ((flt)->offset[CHN_IDX(chn)]) + +#define HAS_FILTERS(strm) ((strm)->strm_flt.flags & STRM_FLT_FL_HAS_FILTERS) + +#define HAS_REQ_DATA_FILTERS(strm) ((strm)->strm_flt.nb_req_data_filters != 0) +#define HAS_RSP_DATA_FILTERS(strm) ((strm)->strm_flt.nb_rsp_data_filters != 0) +#define HAS_DATA_FILTERS(strm, chn) (((chn)->flags & CF_ISRESP) ? HAS_RSP_DATA_FILTERS(strm) : HAS_REQ_DATA_FILTERS(strm)) + +#define IS_REQ_DATA_FILTER(flt) ((flt)->flags & FLT_FL_IS_REQ_DATA_FILTER) +#define IS_RSP_DATA_FILTER(flt) ((flt)->flags & FLT_FL_IS_RSP_DATA_FILTER) +#define IS_DATA_FILTER(flt, chn) (((chn)->flags & CF_ISRESP) ? IS_RSP_DATA_FILTER(flt) : IS_REQ_DATA_FILTER(flt)) + +#define FLT_STRM_CB(strm, call) \ + do { \ + if (HAS_FILTERS(strm)) { call; } \ + } while (0) + +#define FLT_STRM_DATA_CB_IMPL_1(strm, chn, call, default_ret) \ + (HAS_DATA_FILTERS(strm, chn) ? call : default_ret) +#define FLT_STRM_DATA_CB_IMPL_2(strm, chn, call, default_ret, on_error) \ + ({ \ + int _ret; \ + if (HAS_DATA_FILTERS(strm, chn)) { \ + _ret = call; \ + if (_ret < 0) { on_error; } \ + } \ + else \ + _ret = default_ret; \ + _ret; \ + }) +#define FLT_STRM_DATA_CB_IMPL_3(strm, chn, call, default_ret, on_error, on_wait) \ + ({ \ + int _ret; \ + if (HAS_DATA_FILTERS(strm, chn)) { \ + _ret = call; \ + if (_ret < 0) { on_error; } \ + if (!_ret) { on_wait; } \ + } \ + else \ + _ret = default_ret; \ + _ret; \ + }) + +#define FLT_STRM_DATA_CB_IMPL_X(strm, chn, call, A, B, C, DATA_CB_IMPL, ...) \ + DATA_CB_IMPL + +#define FLT_STRM_DATA_CB(strm, chn, call, ...) \ + FLT_STRM_DATA_CB_IMPL_X(strm, chn, call, ##__VA_ARGS__, \ + FLT_STRM_DATA_CB_IMPL_3(strm, chn, call, ##__VA_ARGS__), \ + FLT_STRM_DATA_CB_IMPL_2(strm, chn, call, ##__VA_ARGS__), \ + FLT_STRM_DATA_CB_IMPL_1(strm, chn, call, ##__VA_ARGS__)) + +void flt_deinit(struct proxy *p); +int flt_check(struct proxy *p); + +int flt_stream_start(struct stream *s); +void flt_stream_stop(struct stream *s); +int flt_set_stream_backend(struct stream *s, struct proxy *be); +int flt_stream_init(struct stream *s); +void flt_stream_release(struct stream *s, int only_backend); +void flt_stream_check_timeouts(struct stream *s); + +int flt_http_payload(struct stream *s, struct http_msg *msg, unsigned int len); +int flt_http_end(struct stream *s, struct http_msg *msg); + +void flt_http_reset(struct stream *s, struct http_msg *msg); +void flt_http_reply(struct stream *s, short status, const struct buffer *msg); + +int flt_start_analyze(struct stream *s, struct channel *chn, unsigned int an_bit); +int flt_pre_analyze(struct stream *s, struct channel *chn, unsigned int an_bit); +int flt_post_analyze(struct stream *s, struct channel *chn, unsigned int an_bit); +int flt_analyze_http_headers(struct stream *s, struct channel *chn, unsigned int an_bit); +int flt_end_analyze(struct stream *s, struct channel *chn, unsigned int an_bit); + +int flt_xfer_data(struct stream *s, struct channel *chn, unsigned int an_bit); + +void flt_register_keywords(struct flt_kw_list *kwl); +struct flt_kw *flt_find_kw(const char *kw); +void flt_dump_kws(char **out); +void list_filters(FILE *out); + +/* Helper function that returns the "global" state of filters attached to a + * stream. */ +static inline struct strm_flt * +strm_flt(struct stream *s) +{ + return &s->strm_flt; +} + +/* Registers a filter to a channel. If a filter was already registered, this + * function do nothing. Once registered, the filter becomes a "data" filter for + * this channel. */ +static inline void +register_data_filter(struct stream *s, struct channel *chn, struct filter *filter) +{ + if (!IS_DATA_FILTER(filter, chn)) { + if (chn->flags & CF_ISRESP) { + filter->flags |= FLT_FL_IS_RSP_DATA_FILTER; + strm_flt(s)->nb_rsp_data_filters++; + } + else { + filter->flags |= FLT_FL_IS_REQ_DATA_FILTER; + strm_flt(s)->nb_req_data_filters++; + } + } +} + +/* Unregisters a "data" filter from a channel. */ +static inline void +unregister_data_filter(struct stream *s, struct channel *chn, struct filter *filter) +{ + if (IS_DATA_FILTER(filter, chn)) { + if (chn->flags & CF_ISRESP) { + filter->flags &= ~FLT_FL_IS_RSP_DATA_FILTER; + strm_flt(s)->nb_rsp_data_filters--; + + } + else { + filter->flags &= ~FLT_FL_IS_REQ_DATA_FILTER; + strm_flt(s)->nb_req_data_filters--; + } + } +} + +/* This function must be called when a filter alter payload data. It updates + * offsets of all previous filters. Do not call this function when a filter + * change the size of payload data leads to an undefined behavior. + * + * This is the filter's responsiblitiy to update data itself. + */ +static inline void +flt_update_offsets(struct filter *filter, struct channel *chn, int len) +{ + struct stream *s = chn_strm(chn); + struct filter *f; + + list_for_each_entry(f, &strm_flt(s)->filters, list) { + if (f == filter) + break; + FLT_OFF(f, chn) += len; + } +} + +#endif /* _HAPROXY_FILTERS_H */ |