Mercurial > hg > nginx-quic
view src/http/modules/ngx_http_sub_filter_module.c @ 4360:7447784028a7 stable-1.0
Merge of r4284:
Introduction of simple ngx_write_stderr() instead of ngx_log_stderr()
for output of ./configure options, etc., since ngx_log_stderr() output
length is limited by 2048 characters defined as NGX_MAX_ERROR_STR.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Wed, 14 Dec 2011 15:23:23 +0000 |
parents | 08d7165b6be1 |
children | d620f497c50f |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef struct { ngx_str_t match; ngx_http_complex_value_t value; ngx_hash_t types; ngx_flag_t once; ngx_array_t *types_keys; } ngx_http_sub_loc_conf_t; typedef enum { sub_start_state = 0, sub_match_state, } ngx_http_sub_state_e; typedef struct { ngx_str_t match; ngx_str_t saved; ngx_str_t looked; ngx_uint_t once; /* unsigned once:1 */ ngx_buf_t *buf; u_char *pos; u_char *copy_start; u_char *copy_end; ngx_chain_t *in; ngx_chain_t *out; ngx_chain_t **last_out; ngx_chain_t *busy; ngx_chain_t *free; ngx_str_t sub; ngx_uint_t state; } ngx_http_sub_ctx_t; static ngx_int_t ngx_http_sub_output(ngx_http_request_t *r, ngx_http_sub_ctx_t *ctx); static ngx_int_t ngx_http_sub_parse(ngx_http_request_t *r, ngx_http_sub_ctx_t *ctx); static char * ngx_http_sub_filter(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static void *ngx_http_sub_create_conf(ngx_conf_t *cf); static char *ngx_http_sub_merge_conf(ngx_conf_t *cf, void *parent, void *child); static ngx_int_t ngx_http_sub_filter_init(ngx_conf_t *cf); static ngx_command_t ngx_http_sub_filter_commands[] = { { ngx_string("sub_filter"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, ngx_http_sub_filter, NGX_HTTP_LOC_CONF_OFFSET, 0, NULL }, { ngx_string("sub_filter_types"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, ngx_http_types_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_sub_loc_conf_t, types_keys), &ngx_http_html_default_types[0] }, { ngx_string("sub_filter_once"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, ngx_conf_set_flag_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_sub_loc_conf_t, once), NULL }, ngx_null_command }; static ngx_http_module_t ngx_http_sub_filter_module_ctx = { NULL, /* preconfiguration */ ngx_http_sub_filter_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_sub_create_conf, /* create location configuration */ ngx_http_sub_merge_conf /* merge location configuration */ }; ngx_module_t ngx_http_sub_filter_module = { NGX_MODULE_V1, &ngx_http_sub_filter_module_ctx, /* module context */ ngx_http_sub_filter_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_http_output_header_filter_pt ngx_http_next_header_filter; static ngx_http_output_body_filter_pt ngx_http_next_body_filter; static ngx_int_t ngx_http_sub_header_filter(ngx_http_request_t *r) { ngx_http_sub_ctx_t *ctx; ngx_http_sub_loc_conf_t *slcf; slcf = ngx_http_get_module_loc_conf(r, ngx_http_sub_filter_module); if (slcf->match.len == 0 || r->headers_out.content_length_n == 0 || ngx_http_test_content_type(r, &slcf->types) == NULL) { return ngx_http_next_header_filter(r); } ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_sub_ctx_t)); if (ctx == NULL) { return NGX_ERROR; } ctx->saved.data = ngx_pnalloc(r->pool, slcf->match.len); if (ctx->saved.data == NULL) { return NGX_ERROR; } ctx->looked.data = ngx_pnalloc(r->pool, slcf->match.len); if (ctx->looked.data == NULL) { return NGX_ERROR; } ngx_http_set_ctx(r, ctx, ngx_http_sub_filter_module); ctx->match = slcf->match; ctx->last_out = &ctx->out; r->filter_need_in_memory = 1; if (r == r->main) { ngx_http_clear_content_length(r); ngx_http_clear_last_modified(r); } return ngx_http_next_header_filter(r); } static ngx_int_t ngx_http_sub_body_filter(ngx_http_request_t *r, ngx_chain_t *in) { ngx_int_t rc; ngx_buf_t *b; ngx_chain_t *cl; ngx_http_sub_ctx_t *ctx; ngx_http_sub_loc_conf_t *slcf; ctx = ngx_http_get_module_ctx(r, ngx_http_sub_filter_module); if (ctx == NULL) { return ngx_http_next_body_filter(r, in); } if ((in == NULL && ctx->buf == NULL && ctx->in == NULL && ctx->busy == NULL)) { return ngx_http_next_body_filter(r, in); } if (ctx->once && (ctx->buf == NULL || ctx->in == NULL)) { if (ctx->busy) { if (ngx_http_sub_output(r, ctx) == NGX_ERROR) { return NGX_ERROR; } } return ngx_http_next_body_filter(r, in); } /* add the incoming chain to the chain ctx->in */ if (in) { if (ngx_chain_add_copy(r->pool, &ctx->in, in) != NGX_OK) { return NGX_ERROR; } } ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http sub filter \"%V\"", &r->uri); while (ctx->in || ctx->buf) { if (ctx->buf == NULL) { ctx->buf = ctx->in->buf; ctx->in = ctx->in->next; ctx->pos = ctx->buf->pos; } if (ctx->state == sub_start_state) { ctx->copy_start = ctx->pos; ctx->copy_end = ctx->pos; } b = NULL; while (ctx->pos < ctx->buf->last) { ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "saved: \"%V\" state: %d", &ctx->saved, ctx->state); rc = ngx_http_sub_parse(r, ctx); ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "parse: %d, looked: \"%V\" %p-%p", rc, &ctx->looked, ctx->copy_start, ctx->copy_end); if (rc == NGX_ERROR) { return rc; } if (ctx->copy_start != ctx->copy_end) { ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "saved: \"%V\"", &ctx->saved); if (ctx->saved.len) { if (ctx->free) { cl = ctx->free; ctx->free = ctx->free->next; b = cl->buf; ngx_memzero(b, sizeof(ngx_buf_t)); } else { b = ngx_calloc_buf(r->pool); if (b == NULL) { return NGX_ERROR; } cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } cl->buf = b; } b->pos = ngx_pnalloc(r->pool, ctx->saved.len); if (b->pos == NULL) { return NGX_ERROR; } ngx_memcpy(b->pos, ctx->saved.data, ctx->saved.len); b->last = b->pos + ctx->saved.len; b->memory = 1; *ctx->last_out = cl; ctx->last_out = &cl->next; ctx->saved.len = 0; } if (ctx->free) { cl = ctx->free; ctx->free = ctx->free->next; b = cl->buf; } else { b = ngx_alloc_buf(r->pool); if (b == NULL) { return NGX_ERROR; } cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } cl->buf = b; } ngx_memcpy(b, ctx->buf, sizeof(ngx_buf_t)); b->pos = ctx->copy_start; b->last = ctx->copy_end; b->shadow = NULL; b->last_buf = 0; b->recycled = 0; if (b->in_file) { b->file_last = b->file_pos + (b->last - ctx->buf->pos); b->file_pos += b->pos - ctx->buf->pos; } cl->next = NULL; *ctx->last_out = cl; ctx->last_out = &cl->next; } if (ctx->state == sub_start_state) { ctx->copy_start = ctx->pos; ctx->copy_end = ctx->pos; } else { ctx->copy_start = NULL; ctx->copy_end = NULL; } if (rc == NGX_AGAIN) { continue; } /* rc == NGX_OK */ b = ngx_calloc_buf(r->pool); if (b == NULL) { return NGX_ERROR; } cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } slcf = ngx_http_get_module_loc_conf(r, ngx_http_sub_filter_module); if (ctx->sub.data == NULL) { if (ngx_http_complex_value(r, &slcf->value, &ctx->sub) != NGX_OK) { return NGX_ERROR; } } if (ctx->sub.len) { b->memory = 1; b->pos = ctx->sub.data; b->last = ctx->sub.data + ctx->sub.len; } else { b->sync = 1; } cl->buf = b; cl->next = NULL; *ctx->last_out = cl; ctx->last_out = &cl->next; ctx->once = slcf->once; continue; } if (ctx->buf->last_buf || ngx_buf_in_memory(ctx->buf)) { if (b == NULL) { if (ctx->free) { cl = ctx->free; ctx->free = ctx->free->next; b = cl->buf; ngx_memzero(b, sizeof(ngx_buf_t)); } else { b = ngx_calloc_buf(r->pool); if (b == NULL) { return NGX_ERROR; } cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } cl->buf = b; } b->sync = 1; cl->next = NULL; *ctx->last_out = cl; ctx->last_out = &cl->next; } b->last_buf = ctx->buf->last_buf; b->shadow = ctx->buf; b->recycled = ctx->buf->recycled; } ctx->buf = NULL; ctx->saved.len = ctx->looked.len; ngx_memcpy(ctx->saved.data, ctx->looked.data, ctx->looked.len); } if (ctx->out == NULL && ctx->busy == NULL) { return NGX_OK; } return ngx_http_sub_output(r, ctx); } static ngx_int_t ngx_http_sub_output(ngx_http_request_t *r, ngx_http_sub_ctx_t *ctx) { ngx_int_t rc; ngx_buf_t *b; ngx_chain_t *cl; #if 1 b = NULL; for (cl = ctx->out; cl; cl = cl->next) { ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "sub out: %p %p", cl->buf, cl->buf->pos); if (cl->buf == b) { ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, "the same buf was used in sub"); ngx_debug_point(); return NGX_ERROR; } b = cl->buf; } #endif rc = ngx_http_next_body_filter(r, ctx->out); if (ctx->busy == NULL) { ctx->busy = ctx->out; } else { for (cl = ctx->busy; cl->next; cl = cl->next) { /* void */ } cl->next = ctx->out; } ctx->out = NULL; ctx->last_out = &ctx->out; while (ctx->busy) { cl = ctx->busy; b = cl->buf; if (ngx_buf_size(b) != 0) { break; } if (b->shadow) { b->shadow->pos = b->shadow->last; } ctx->busy = cl->next; if (ngx_buf_in_memory(b) || b->in_file) { /* add data bufs only to the free buf chain */ cl->next = ctx->free; ctx->free = cl; } } if (ctx->in || ctx->buf) { r->buffered |= NGX_HTTP_SUB_BUFFERED; } else { r->buffered &= ~NGX_HTTP_SUB_BUFFERED; } return rc; } static ngx_int_t ngx_http_sub_parse(ngx_http_request_t *r, ngx_http_sub_ctx_t *ctx) { u_char *p, *last, *copy_end, ch, match; size_t looked; ngx_http_sub_state_e state; if (ctx->once) { ctx->copy_start = ctx->pos; ctx->copy_end = ctx->buf->last; ctx->pos = ctx->buf->last; ctx->looked.len = 0; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "once"); return NGX_AGAIN; } state = ctx->state; looked = ctx->looked.len; last = ctx->buf->last; copy_end = ctx->copy_end; for (p = ctx->pos; p < last; p++) { ch = *p; ch = ngx_tolower(ch); if (state == sub_start_state) { /* the tight loop */ match = ctx->match.data[0]; for ( ;; ) { if (ch == match) { copy_end = p; ctx->looked.data[0] = *p; looked = 1; state = sub_match_state; goto match_started; } if (++p == last) { break; } ch = *p; ch = ngx_tolower(ch); } ctx->state = state; ctx->pos = p; ctx->looked.len = looked; ctx->copy_end = p; if (ctx->copy_start == NULL) { ctx->copy_start = ctx->buf->pos; } return NGX_AGAIN; match_started: continue; } /* state == sub_match_state */ if (ch == ctx->match.data[looked]) { ctx->looked.data[looked] = *p; looked++; if (looked == ctx->match.len) { if ((size_t) (p - ctx->pos) < looked) { ctx->saved.len = 0; } ctx->state = sub_start_state; ctx->pos = p + 1; ctx->looked.len = 0; ctx->copy_end = copy_end; if (ctx->copy_start == NULL && copy_end) { ctx->copy_start = ctx->buf->pos; } return NGX_OK; } } else if (ch == ctx->match.data[0]) { copy_end = p; ctx->looked.data[0] = *p; looked = 1; } else { copy_end = p; looked = 0; state = sub_start_state; } } ctx->state = state; ctx->pos = p; ctx->looked.len = looked; ctx->copy_end = (state == sub_start_state) ? p : copy_end; if (ctx->copy_start == NULL && ctx->copy_end) { ctx->copy_start = ctx->buf->pos; } return NGX_AGAIN; } static char * ngx_http_sub_filter(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_sub_loc_conf_t *slcf = conf; ngx_str_t *value; ngx_http_compile_complex_value_t ccv; if (slcf->match.len) { return "is duplicate"; } value = cf->args->elts; ngx_strlow(value[1].data, value[1].data, value[1].len); slcf->match = value[1]; ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); ccv.cf = cf; ccv.value = &value[2]; ccv.complex_value = &slcf->value; if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { return NGX_CONF_ERROR; } return NGX_CONF_OK; } static void * ngx_http_sub_create_conf(ngx_conf_t *cf) { ngx_http_sub_loc_conf_t *slcf; slcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_sub_loc_conf_t)); if (slcf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->match = { 0, NULL }; * conf->sub = { 0, NULL }; * conf->sub_lengths = NULL; * conf->sub_values = NULL; * conf->types = { NULL }; * conf->types_keys = NULL; */ slcf->once = NGX_CONF_UNSET; return slcf; } static char * ngx_http_sub_merge_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_sub_loc_conf_t *prev = parent; ngx_http_sub_loc_conf_t *conf = child; ngx_conf_merge_value(conf->once, prev->once, 1); ngx_conf_merge_str_value(conf->match, prev->match, ""); if (conf->value.value.len == 0) { conf->value = prev->value; } if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types, &prev->types_keys, &prev->types, ngx_http_html_default_types) != NGX_OK) { return NGX_CONF_ERROR; } return NGX_CONF_OK; } static ngx_int_t ngx_http_sub_filter_init(ngx_conf_t *cf) { ngx_http_next_header_filter = ngx_http_top_header_filter; ngx_http_top_header_filter = ngx_http_sub_header_filter; ngx_http_next_body_filter = ngx_http_top_body_filter; ngx_http_top_body_filter = ngx_http_sub_body_filter; return NGX_OK; }