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For more * information on the Apache Software Foundation, please see * . */ /* * mod_bucketeer.c: split buckets whenever we find a control-char * * Written by Ian Holsman (IanH@apache.org) * */ #include "httpd.h" #include "http_config.h" #include "http_log.h" #include "apr_strings.h" #include "apr_general.h" #include "util_filter.h" #include "apr_buckets.h" #include "http_request.h" #include "http_protocol.h" static const char bucketeerFilterName[] = "BUCKETEER"; module AP_MODULE_DECLARE_DATA bucketeer_module; typedef struct bucketeer_filter_config_t { char bucketdelimiter; char passdelimiter; char flushdelimiter; } bucketeer_filter_config_t; static void *create_bucketeer_server_config(apr_pool_t *p, server_rec *s) { bucketeer_filter_config_t *c = apr_pcalloc(p, sizeof *c); c->bucketdelimiter = 0x02; /* ^B */ c->passdelimiter = 0x10; /* ^P */ c->flushdelimiter = 0x06; /* ^F */ return c; } typedef struct bucketeer_ctx_t { apr_bucket_brigade *bb; } bucketeer_ctx_t; static apr_status_t bucketeer_out_filter(ap_filter_t *f, apr_bucket_brigade *bb) { apr_bucket *e; request_rec *r = f->r; bucketeer_ctx_t *ctx = f->ctx; bucketeer_filter_config_t *c; c = ap_get_module_config(r->server->module_config, &bucketeer_module); /* If have a context, it means we've done this before successfully. */ if (!ctx) { if (!r->content_type || strncmp(r->content_type, "text/", 5)) { ap_remove_output_filter(f); return ap_pass_brigade(f->next, bb); } /* We're cool with filtering this. */ ctx = f->ctx = apr_pcalloc(f->r->pool, sizeof(*ctx)); ctx->bb = apr_brigade_create(f->r->pool, f->c->bucket_alloc); apr_table_unset(f->r->headers_out, "Content-Length"); } APR_BRIGADE_FOREACH(e, bb) { const char *data; apr_size_t len, i, lastpos; if (APR_BUCKET_IS_EOS(e)) { APR_BUCKET_REMOVE(e); APR_BRIGADE_INSERT_TAIL(ctx->bb, e); /* Okay, we've seen the EOS. * Time to pass it along down the chain. */ return ap_pass_brigade(f->next, ctx->bb); } if (APR_BUCKET_IS_FLUSH(e)) { /* * Ignore flush buckets for the moment.. * we decide what to stream */ continue; } if (APR_BUCKET_IS_METADATA(e)) { /* metadata bucket */ apr_bucket *cpy; apr_bucket_copy(e, &cpy); APR_BRIGADE_INSERT_TAIL(ctx->bb, cpy); continue; } /* read */ apr_bucket_read(e, &data, &len, APR_BLOCK_READ); if (len > 0) { lastpos = 0; for (i = 0; i < len; i++) { if (data[i] == c->flushdelimiter || data[i] == c->bucketdelimiter || data[i] == c->passdelimiter) { apr_bucket *p; if (i - lastpos > 0) { p = apr_bucket_pool_create(apr_pmemdup(f->r->pool, &data[lastpos], i - lastpos), i - lastpos, f->r->pool, f->c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(ctx->bb, p); } lastpos = i + 1; if (data[i] == c->flushdelimiter) { p = apr_bucket_flush_create(f->c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(ctx->bb, p); } if (data[i] == c->flushdelimiter || data[i] == c->passdelimiter) { ap_pass_brigade(f->next, ctx->bb); /* apr_brigade_cleanup(ctx->bb);*/ } } } /* XXX: really should append this to the next 'real' bucket */ if (lastpos < i) { apr_bucket *p; p = apr_bucket_pool_create(apr_pmemdup(f->r->pool, &data[lastpos], i - lastpos), i - lastpos, f->r->pool, f->c->bucket_alloc); lastpos = i; APR_BRIGADE_INSERT_TAIL(ctx->bb, p); } } } return APR_SUCCESS; } static void register_hooks(apr_pool_t * p) { ap_register_output_filter(bucketeerFilterName, bucketeer_out_filter, AP_FTYPE_RESOURCE-1); } static const command_rec bucketeer_filter_cmds[] = { {NULL} }; module AP_MODULE_DECLARE_DATA bucketeer_module = { STANDARD20_MODULE_STUFF, NULL, NULL, create_bucketeer_server_config, NULL, bucketeer_filter_cmds, register_hooks };