Mercurial > hg > nginx-mail
view src/http/modules/ngx_http_charset_filter.c @ 14:8a529698ed55 NGINX_0_1_7
nginx 0.1.7
*) Bugfix: on FreeBSD the segmentation fault may occur if the size of
the transferred file was changed; bug appeared in 0.1.5.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Fri, 12 Nov 2004 00:00:00 +0300 |
parents | 46833bd150cb |
children | 45fe5b98a9de |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef struct { char **tables; ngx_str_t name; ngx_uint_t server; /* unsigned server:1; */ } ngx_http_charset_t; typedef struct { ngx_int_t src; ngx_int_t dst; char *src2dst; char *dst2src; } ngx_http_charset_tables_t; typedef struct { ngx_array_t charsets; /* ngx_http_charset_t */ ngx_array_t tables; /* ngx_http_charset_tables_t */ } ngx_http_charset_main_conf_t; typedef struct { ngx_flag_t enable; ngx_flag_t autodetect; ngx_int_t default_charset; ngx_int_t source_charset; } ngx_http_charset_loc_conf_t; typedef struct { ngx_int_t server; ngx_int_t client; } ngx_http_charset_ctx_t; static ngx_uint_t ngx_charset_recode(ngx_buf_t *b, char *table); static char *ngx_charset_map_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static char *ngx_charset_map(ngx_conf_t *cf, ngx_command_t *dummy, void *conf); static char *ngx_http_set_charset_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_int_t ngx_http_add_charset(ngx_array_t *charsets, ngx_str_t *name); static ngx_int_t ngx_http_charset_filter_init(ngx_cycle_t *cycle); static void *ngx_http_charset_create_main_conf(ngx_conf_t *cf); static char *ngx_http_charset_init_main_conf(ngx_conf_t *cf, void *conf); static void *ngx_http_charset_create_loc_conf(ngx_conf_t *cf); static char *ngx_http_charset_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child); static ngx_command_t ngx_http_charset_filter_commands[] = { { ngx_string("charset_map"), NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE2, ngx_charset_map_block, NGX_HTTP_MAIN_CONF_OFFSET, 0, NULL }, { ngx_string("default_charset"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_http_set_charset_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_charset_loc_conf_t, default_charset), NULL }, { ngx_string("source_charset"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, ngx_http_set_charset_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_charset_loc_conf_t, source_charset), NULL }, { ngx_string("charset"), 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_charset_loc_conf_t, enable), NULL }, { ngx_string("autodetect_charset"), 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_charset_loc_conf_t, autodetect), NULL }, ngx_null_command }; static ngx_http_module_t ngx_http_charset_filter_module_ctx = { NULL, /* pre conf */ ngx_http_charset_create_main_conf, /* create main configuration */ ngx_http_charset_init_main_conf, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ ngx_http_charset_create_loc_conf, /* create location configuration */ ngx_http_charset_merge_loc_conf /* merge location configuration */ }; ngx_module_t ngx_http_charset_filter_module = { NGX_MODULE, &ngx_http_charset_filter_module_ctx, /* module context */ ngx_http_charset_filter_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ ngx_http_charset_filter_init, /* init module */ NULL /* init process */ }; 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_charset_header_filter(ngx_http_request_t *r) { ngx_http_charset_t *charsets; ngx_http_charset_ctx_t *ctx; ngx_http_charset_loc_conf_t *lcf; ngx_http_charset_main_conf_t *mcf; mcf = ngx_http_get_module_main_conf(r, ngx_http_charset_filter_module); lcf = ngx_http_get_module_loc_conf(r, ngx_http_charset_filter_module); if (lcf->enable == 0) { return ngx_http_next_header_filter(r); } #if 0 if (lcf->default_charset.len == 0) { return ngx_http_next_header_filter(r); } #endif if (r->headers_out.content_type == NULL) { return ngx_http_next_header_filter(r); } if (ngx_strncasecmp(r->headers_out.content_type->value.data, "text/", 5) != 0 && ngx_strncasecmp(r->headers_out.content_type->value.data, "application/x-javascript", 24) != 0) { return ngx_http_next_header_filter(r); } if (ngx_strstr(r->headers_out.content_type->value.data, "charset") != NULL) { return ngx_http_next_header_filter(r); } if (r->headers_out.status == NGX_HTTP_MOVED_PERMANENTLY && r->headers_out.status == NGX_HTTP_MOVED_TEMPORARILY) { /* * do not set charset for the redirect because NN 4.x uses this * charset instead of the next page charset */ r->headers_out.charset.len = 0; return ngx_http_next_header_filter(r); } if (r->headers_out.charset.len) { return ngx_http_next_header_filter(r); } charsets = mcf->charsets.elts; r->headers_out.charset = charsets[lcf->default_charset].name; if (lcf->default_charset == lcf->source_charset) { return ngx_http_next_header_filter(r); } ngx_http_create_ctx(r, ctx, ngx_http_charset_filter_module, sizeof(ngx_http_charset_ctx_t), NGX_ERROR); r->filter_need_in_memory = 1; return ngx_http_next_header_filter(r); } static ngx_int_t ngx_http_charset_body_filter(ngx_http_request_t *r, ngx_chain_t *in) { char *table; ngx_chain_t *cl; ngx_http_charset_t *charsets; ngx_http_charset_ctx_t *ctx; ngx_http_charset_loc_conf_t *lcf; ngx_http_charset_main_conf_t *mcf; ctx = ngx_http_get_module_ctx(r, ngx_http_charset_filter_module); if (ctx == NULL) { return ngx_http_next_body_filter(r, in); } mcf = ngx_http_get_module_main_conf(r, ngx_http_charset_filter_module); lcf = ngx_http_get_module_loc_conf(r, ngx_http_charset_filter_module); charsets = mcf->charsets.elts; table = charsets[lcf->source_charset].tables[lcf->default_charset]; for (cl = in; cl; cl = cl->next) { ngx_charset_recode(cl->buf, table); } return ngx_http_next_body_filter(r, in); } static ngx_uint_t ngx_charset_recode(ngx_buf_t *b, char *table) { u_char *p; ngx_uint_t change; change = 0; for (p = b->pos; p < b->last; p++) { if (*p != table[*p]) { change = 1; break; } } if (change) { while (p < b->last) { *p = table[*p]; p++; } b->in_file = 0; } return change; } static char *ngx_charset_map_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_charset_main_conf_t *mcf = conf; char *rv; ngx_int_t src, dst; ngx_uint_t i; ngx_str_t *value; ngx_conf_t pvcf; ngx_http_charset_tables_t *table; value = cf->args->elts; src = ngx_http_add_charset(&mcf->charsets, &value[1]); if (src == NGX_ERROR) { return NGX_CONF_ERROR; } dst = ngx_http_add_charset(&mcf->charsets, &value[2]); if (dst == NGX_ERROR) { return NGX_CONF_ERROR; } if (src == dst) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "\"charset_map\" between the same charsets " "\"%V\" and \"%V\"", &value[1], &value[2]); return NGX_CONF_ERROR; } table = mcf->tables.elts; for (i = 0; i < mcf->tables.nelts; i++) { if ((src == table->src && dst == table->dst) || (src == table->dst && dst == table->src)) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "duplicate \"charset_map\" between " "\"%V\" and \"%V\"", &value[1], &value[2]); return NGX_CONF_ERROR; } } if (!(table = ngx_push_array(&mcf->tables))) { return NGX_CONF_ERROR; } table->src = src; table->dst = dst; if (!(table->src2dst = ngx_palloc(cf->pool, 256))) { return NGX_CONF_ERROR; } if (!(table->dst2src = ngx_palloc(cf->pool, 256))) { return NGX_CONF_ERROR; } for (i = 0; i < 128; i++) { table->src2dst[i] = (char) i; table->dst2src[i] = (char) i; } for (/* void */; i < 256; i++) { table->src2dst[i] = '?'; table->dst2src[i] = '?'; } pvcf = *cf; cf->ctx = table; cf->handler = ngx_charset_map; cf->handler_conf = conf; rv = ngx_conf_parse(cf, NULL); *cf = pvcf; return rv; } static char *ngx_charset_map(ngx_conf_t *cf, ngx_command_t *dummy, void *conf) { ngx_int_t src, dst; ngx_str_t *value; ngx_http_charset_tables_t *table; if (cf->args->nelts != 2) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameters number"); return NGX_CONF_ERROR; } value = cf->args->elts; src = ngx_hextoi(value[0].data, value[0].len); if (src == NGX_ERROR || src > 255) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid value \"%V\"", &value[0]); return NGX_CONF_ERROR; } dst = ngx_hextoi(value[1].data, value[1].len); if (dst == NGX_ERROR || dst > 255) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid value \"%V\"", &value[1]); return NGX_CONF_ERROR; } table = cf->ctx; table->src2dst[src] = (char) dst; table->dst2src[dst] = (char) src; return NGX_CONF_OK; } static char *ngx_http_set_charset_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { char *p = conf; ngx_int_t *cp; ngx_str_t *value; ngx_http_charset_t *charset; ngx_http_charset_main_conf_t *mcf; cp = (ngx_int_t *) (p + cmd->offset); if (*cp != NGX_CONF_UNSET) { return "is duplicate"; } mcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_charset_filter_module); value = cf->args->elts; *cp = ngx_http_add_charset(&mcf->charsets, &value[1]); if (*cp == NGX_ERROR) { return NGX_CONF_ERROR; } if (cmd->offset == offsetof(ngx_http_charset_loc_conf_t, source_charset)) { charset = mcf->charsets.elts; charset[*cp].server = 1; } return NGX_CONF_OK; } static ngx_int_t ngx_http_add_charset(ngx_array_t *charsets, ngx_str_t *name) { ngx_uint_t i; ngx_http_charset_t *c; c = charsets->elts; for (i = 0; i < charsets->nelts; i++) { if (name->len != c[i].name.len) { continue; } if (ngx_strcasecmp(name->data, c[i].name.data) == 0) { break; } } if (i < charsets->nelts) { return i; } if (!(c = ngx_push_array(charsets))) { return NGX_ERROR; } c->tables = NULL; c->name = *name; c->server = 0; return i; } static ngx_int_t ngx_http_charset_filter_init(ngx_cycle_t *cycle) { ngx_http_next_header_filter = ngx_http_top_header_filter; ngx_http_top_header_filter = ngx_http_charset_header_filter; ngx_http_next_body_filter = ngx_http_top_body_filter; ngx_http_top_body_filter = ngx_http_charset_body_filter; return NGX_OK; } static void *ngx_http_charset_create_main_conf(ngx_conf_t *cf) { ngx_http_charset_main_conf_t *mcf; if (!(mcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_charset_main_conf_t)))) { return NGX_CONF_ERROR; } ngx_init_array(mcf->charsets, cf->pool, 5, sizeof(ngx_http_charset_t), NGX_CONF_ERROR); ngx_init_array(mcf->tables, cf->pool, 10, sizeof(ngx_http_charset_tables_t), NGX_CONF_ERROR); return mcf; } static char *ngx_http_charset_init_main_conf(ngx_conf_t *cf, void *conf) { ngx_http_charset_main_conf_t *mcf = conf; ngx_uint_t i, n; ngx_http_charset_t *charset; ngx_http_charset_tables_t *tables; tables = mcf->tables.elts; charset = mcf->charsets.elts; for (i = 0; i < mcf->charsets.nelts; i++) { if (!charset[i].server) { continue; } charset[i].tables = ngx_pcalloc(cf->pool, sizeof(char *) * mcf->charsets.nelts); if (charset[i].tables == NULL) { return NGX_CONF_ERROR; } for (n = 0; n < mcf->tables.nelts; n++) { if ((ngx_int_t) i == tables[n].src) { charset[i].tables[tables[n].dst] = tables[n].src2dst; continue; } if ((ngx_int_t) i == tables[n].dst) { charset[i].tables[tables[n].src] = tables[n].dst2src; } } } for (i = 0; i < mcf->charsets.nelts; i++) { if (!charset[i].server) { continue; } for (n = 0; n < mcf->charsets.nelts; n++) { if (i == n) { continue; } if (charset[i].tables[n]) { continue; } ngx_log_error(NGX_LOG_EMERG, cf->log, 0, " no \"charset_map\" between the charsets " "\"%V\" and \"%V\"", &charset[i].name, &charset[n].name); return NGX_CONF_ERROR; } } return NGX_CONF_OK; } static void *ngx_http_charset_create_loc_conf(ngx_conf_t *cf) { ngx_http_charset_loc_conf_t *lcf; if (!(lcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_charset_loc_conf_t)))) { return NGX_CONF_ERROR; } lcf->enable = NGX_CONF_UNSET; lcf->autodetect = NGX_CONF_UNSET; lcf->default_charset = NGX_CONF_UNSET; lcf->source_charset = NGX_CONF_UNSET; return lcf; } static char *ngx_http_charset_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) { ngx_http_charset_loc_conf_t *prev = parent; ngx_http_charset_loc_conf_t *conf = child; ngx_conf_merge_value(conf->enable, prev->enable, 0); ngx_conf_merge_value(conf->autodetect, prev->autodetect, 0); if (conf->source_charset == NGX_CONF_UNSET) { conf->source_charset = prev->source_charset; } ngx_conf_merge_value(conf->default_charset, prev->default_charset, conf->source_charset); return NGX_CONF_OK; }