/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * This imagemap module started as a port of the original imagemap.c * written by Rob McCool (11/13/93 robm@ncsa.uiuc.edu). * This version includes the mapping algorithms found in version 1.3 * of imagemap.c. * * Contributors to this code include: * * Kevin Hughes, kevinh@pulua.hcc.hawaii.edu * * Eric Haines, erich@eye.com * "macmartinized" polygon code copyright 1992 by Eric Haines, erich@eye.com * * Randy Terbush, randy@zyzzyva.com * port to Apache module format, "base_uri" and support for relative URLs * * James H. Cloos, Jr., cloos@jhcloos.com * Added point datatype, using code in NCSA's version 1.8 imagemap.c * program, as distributed with version 1.4.1 of their server. * The point code is originally added by Craig Milo Rogers, Rogers@ISI.Edu * * Nathan Kurz, nate@tripod.com * Rewrite/reorganization. New handling of default, base and relative URLs. * New Configuration directives: * ImapMenu {none, formatted, semiformatted, unformatted} * ImapDefault {error, nocontent, referer, menu, URL} * ImapBase {map, referer, URL} * Support for creating non-graphical menu added. (backwards compatible): * Old: directive URL [x,y ...] * New: directive URL "Menu text" [x,y ...] * or: directive URL x,y ... "Menu text" * Map format and menu concept courtesy Joshua Bell, jsbell@acs.ucalgary.ca. * * Mark Cox, mark@ukweb.com, Allow relative URLs even when no base specified */ #include "apr.h" #include "apr_strings.h" #include "apr_lib.h" #define APR_WANT_STDIO /* for sscanf() */ #define APR_WANT_STRFUNC #include "apr_want.h" #include "ap_config.h" #include "httpd.h" #include "http_config.h" #include "http_request.h" #include "http_core.h" #include "http_protocol.h" #include "http_main.h" #include "http_log.h" #include "util_script.h" #include "mod_core.h" #define IMAP_MAGIC_TYPE "application/x-httpd-imap" #define MAXVERTS 100 #define X 0 #define Y 1 #define IMAP_MENU_DEFAULT "formatted" #define IMAP_DEFAULT_DEFAULT "nocontent" #define IMAP_BASE_DEFAULT "map" #ifdef SUNOS4 double strtod(); /* SunOS needed this */ #endif module AP_MODULE_DECLARE_DATA imagemap_module; typedef struct { char *imap_menu; char *imap_default; char *imap_base; } imap_conf_rec; static void *create_imap_dir_config(apr_pool_t *p, char *dummy) { imap_conf_rec *icr = (imap_conf_rec *) apr_palloc(p, sizeof(imap_conf_rec)); icr->imap_menu = NULL; icr->imap_default = NULL; icr->imap_base = NULL; return icr; } static void *merge_imap_dir_configs(apr_pool_t *p, void *basev, void *addv) { imap_conf_rec *new = (imap_conf_rec *) apr_pcalloc(p, sizeof(imap_conf_rec)); imap_conf_rec *base = (imap_conf_rec *) basev; imap_conf_rec *add = (imap_conf_rec *) addv; new->imap_menu = add->imap_menu ? add->imap_menu : base->imap_menu; new->imap_default = add->imap_default ? add->imap_default : base->imap_default; new->imap_base = add->imap_base ? add->imap_base : base->imap_base; return new; } static const command_rec imap_cmds[] = { AP_INIT_TAKE1("ImapMenu", ap_set_string_slot, (void *)APR_OFFSETOF(imap_conf_rec, imap_menu), OR_INDEXES, "the type of menu generated: none, formatted, semiformatted, " "unformatted"), AP_INIT_TAKE1("ImapDefault", ap_set_string_slot, (void *)APR_OFFSETOF(imap_conf_rec, imap_default), OR_INDEXES, "the action taken if no match: error, nocontent, referer, " "menu, URL"), AP_INIT_TAKE1("ImapBase", ap_set_string_slot, (void *)APR_OFFSETOF(imap_conf_rec, imap_base), OR_INDEXES, "the base for all URL's: map, referer, URL (or start of)"), {NULL} }; static int pointinrect(const double point[2], double coords[MAXVERTS][2]) { double max[2], min[2]; if (coords[0][X] > coords[1][X]) { max[0] = coords[0][X]; min[0] = coords[1][X]; } else { max[0] = coords[1][X]; min[0] = coords[0][X]; } if (coords[0][Y] > coords[1][Y]) { max[1] = coords[0][Y]; min[1] = coords[1][Y]; } else { max[1] = coords[1][Y]; min[1] = coords[0][Y]; } return ((point[X] >= min[0] && point[X] <= max[0]) && (point[Y] >= min[1] && point[Y] <= max[1])); } static int pointincircle(const double point[2], double coords[MAXVERTS][2]) { double radius1, radius2; radius1 = ((coords[0][Y] - coords[1][Y]) * (coords[0][Y] - coords[1][Y])) + ((coords[0][X] - coords[1][X]) * (coords[0][X] - coords[1][X])); radius2 = ((coords[0][Y] - point[Y]) * (coords[0][Y] - point[Y])) + ((coords[0][X] - point[X]) * (coords[0][X] - point[X])); return (radius2 <= radius1); } #define fmin(a,b) (((a)>(b))?(b):(a)) #define fmax(a,b) (((a)>(b))?(a):(b)) static int pointinpoly(const double point[2], double pgon[MAXVERTS][2]) { int i, numverts, crossings = 0; double x = point[X], y = point[Y]; for (numverts = 0; pgon[numverts][X] != -1 && numverts < MAXVERTS; numverts++) { /* just counting the vertexes */ } for (i = 0; i < numverts; i++) { double x1=pgon[i][X]; double y1=pgon[i][Y]; double x2=pgon[(i + 1) % numverts][X]; double y2=pgon[(i + 1) % numverts][Y]; double d=(y - y1) * (x2 - x1) - (x - x1) * (y2 - y1); if ((y1 >= y) != (y2 >= y)) { crossings +=y2 - y1 >= 0 ? d >= 0 : d <= 0; } if (!d && fmin(x1,x2) <= x && x <= fmax(x1,x2) && fmin(y1,y2) <= y && y <= fmax(y1,y2)) { return 1; } } return crossings & 0x01; } static int is_closer(const double point[2], double coords[MAXVERTS][2], double *closest) { double dist_squared = ((point[X] - coords[0][X]) * (point[X] - coords[0][X])) + ((point[Y] - coords[0][Y]) * (point[Y] - coords[0][Y])); if (point[X] < 0 || point[Y] < 0) { return (0); /* don't mess around with negative coordinates */ } if (*closest < 0 || dist_squared < *closest) { *closest = dist_squared; return (1); /* if this is the first point or is the closest yet set 'closest' equal to this distance^2 */ } return (0); /* if it's not the first or closest */ } static double get_x_coord(const char *args) { char *endptr; /* we want it non-null */ double x_coord = -1; /* -1 is returned if no coordinate is given */ if (args == NULL) { return (-1); /* in case we aren't passed anything */ } while (*args && !apr_isdigit(*args) && *args != ',') { args++; /* jump to the first digit, but not past a comma or end */ } x_coord = strtod(args, &endptr); if (endptr > args) { /* if a conversion was made */ return (x_coord); } return (-1); /* else if no conversion was made, or if no args was given */ } static double get_y_coord(const char *args) { char *endptr; /* we want it non-null */ const char *start_of_y = NULL; double y_coord = -1; /* -1 is returned on error */ if (args == NULL) { return (-1); /* in case we aren't passed anything */ } start_of_y = ap_strchr_c(args, ','); /* the comma */ if (start_of_y) { start_of_y++; /* start looking at the character after the comma */ while (*start_of_y && !apr_isdigit(*start_of_y)) { start_of_y++; /* jump to the first digit, but not past the end */ } y_coord = strtod(start_of_y, &endptr); if (endptr > start_of_y) { return (y_coord); } } return (-1); /* if no conversion was made, or no comma was found in args */ } /* See if string has a "quoted part", and if so set *quoted_part to * the first character of the quoted part, then hammer a \0 onto the * trailing quote, and set *string to point at the first character * past the second quote. * * Otherwise set *quoted_part to NULL, and leave *string alone. */ static void read_quoted(char **string, char **quoted_part) { char *strp = *string; /* assume there's no quoted part */ *quoted_part = NULL; while (apr_isspace(*strp)) { strp++; /* go along string until non-whitespace */ } if (*strp == '"') { /* if that character is a double quote */ strp++; /* step over it */ *quoted_part = strp; /* note where the quoted part begins */ while (*strp && *strp != '"') { ++strp; /* skip the quoted portion */ } *strp = '\0'; /* end the string with a NUL */ strp++; /* step over the last double quote */ *string = strp; } } /* * returns the mapped URL or NULL. */ static char *imap_url(request_rec *r, const char *base, const char *value) { /* translates a value into a URL. */ int slen, clen; char *string_pos = NULL; const char *string_pos_const = NULL; char *directory = NULL; const char *referer = NULL; char *my_base; if (!strcasecmp(value, "map") || !strcasecmp(value, "menu")) { return ap_construct_url(r->pool, r->uri, r); } if (!strcasecmp(value, "nocontent") || !strcasecmp(value, "error")) { return apr_pstrdup(r->pool, value); /* these are handled elsewhere, so just copy them */ } if (!strcasecmp(value, "referer")) { referer = apr_table_get(r->headers_in, "Referer"); if (referer && *referer) { return ap_escape_html(r->pool, referer); } else { /* XXX: This used to do *value = '\0'; ... which is totally bogus * because it hammers the passed in value, which can be a string * constant, or part of a config, or whatever. Total garbage. * This works around that without changing the rest of this * code much */ value = ""; /* if 'referer' but no referring page, null the value */ } } string_pos_const = value; while (apr_isalpha(*string_pos_const)) { string_pos_const++; /* go along the URL from the map until a non-letter */ } if (*string_pos_const == ':') { /* if letters and then a colon (like http:) */ /* it's an absolute URL, so use it! */ return apr_pstrdup(r->pool, value); } if (!base || !*base) { if (value && *value) { return apr_pstrdup(r->pool, value); /* no base: use what is given */ } /* no base, no value: pick a simple default */ return ap_construct_url(r->pool, "/", r); } /* must be a relative URL to be combined with base */ if (ap_strchr_c(base, '/') == NULL && (!strncmp(value, "../", 3) || !strcmp(value, ".."))) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "invalid base directive in map file: %s", r->uri); return NULL; } my_base = apr_pstrdup(r->pool, base); string_pos = my_base; while (*string_pos) { if (*string_pos == '/' && *(string_pos + 1) == '/') { string_pos += 2; /* if there are two slashes, jump over them */ continue; } if (*string_pos == '/') { /* the first single slash */ if (value[0] == '/') { *string_pos = '\0'; } /* if the URL from the map starts from root, end the base URL string at the first single slash */ else { directory = string_pos; /* save the start of the directory portion */ string_pos = strrchr(string_pos, '/'); /* now reuse string_pos */ string_pos++; /* step over that last slash */ *string_pos = '\0'; } /* but if the map url is relative, leave the slash on the base (if there is one) */ break; } string_pos++; /* until we get to the end of my_base without finding a slash by itself */ } while (!strncmp(value, "../", 3) || !strcmp(value, "..")) { if (directory && (slen = strlen(directory))) { /* for each '..', knock a directory off the end by ending the string right at the last slash. But only consider the directory portion: don't eat into the server name. And only try if a directory portion was found */ clen = slen - 1; while ((slen - clen) == 1) { if ((string_pos = strrchr(directory, '/'))) { *string_pos = '\0'; } clen = strlen(directory); if (clen == 0) { break; } } value += 2; /* jump over the '..' that we found in the value */ } else if (directory) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "invalid directory name in map file: %s", r->uri); return NULL; } if (!strncmp(value, "/../", 4) || !strcmp(value, "/..")) { value++; /* step over the '/' if there are more '..' to do. This way, we leave the starting '/' on value after the last '..', but get rid of it otherwise */ } } /* by this point, value does not start with '..' */ if (value && *value) { return apr_pstrcat(r->pool, my_base, value, NULL); } return my_base; } static int imap_reply(request_rec *r, char *redirect) { if (!strcasecmp(redirect, "error")) { /* they actually requested an error! */ return HTTP_INTERNAL_SERVER_ERROR; } if (!strcasecmp(redirect, "nocontent")) { /* tell the client to keep the page it has */ return HTTP_NO_CONTENT; } if (redirect && *redirect) { /* must be a URL, so redirect to it */ apr_table_setn(r->headers_out, "Location", redirect); return HTTP_MOVED_TEMPORARILY; } return HTTP_INTERNAL_SERVER_ERROR; } static void menu_header(request_rec *r, char *menu) { ap_set_content_type(r, "text/html; charset=ISO-8859-1"); ap_rvputs(r, DOCTYPE_HTML_3_2, "<html><head>\n<title>Menu for ", ap_escape_html(r->pool, r->uri), "</title>\n</head><body>\n", NULL); if (!strcasecmp(menu, "formatted")) { ap_rvputs(r, "<h1>Menu for ", ap_escape_html(r->pool, r->uri), "</h1>\n<hr />\n\n", NULL); } return; } static void menu_blank(request_rec *r, char *menu) { if (!strcasecmp(menu, "formatted")) { ap_rputs("\n", r); } if (!strcasecmp(menu, "semiformatted")) { ap_rputs("<br />\n", r); } if (!strcasecmp(menu, "unformatted")) { ap_rputs("\n", r); } return; } static void menu_comment(request_rec *r, char *menu, char *comment) { if (!strcasecmp(menu, "formatted")) { ap_rputs("\n", r); /* print just a newline if 'formatted' */ } if (!strcasecmp(menu, "semiformatted") && *comment) { ap_rvputs(r, comment, "\n", NULL); } if (!strcasecmp(menu, "unformatted") && *comment) { ap_rvputs(r, comment, "\n", NULL); } return; /* comments are ignored in the 'formatted' form */ } static void menu_default(request_rec *r, char *menu, char *href, char *text) { if (!strcasecmp(href, "error") || !strcasecmp(href, "nocontent")) { return; /* don't print such lines, these aren't really href's */ } if (!strcasecmp(menu, "formatted")) { ap_rvputs(r, "<pre>(Default) <a href=\"", href, "\">", text, "</a></pre>\n", NULL); } if (!strcasecmp(menu, "semiformatted")) { ap_rvputs(r, "<pre>(Default) <a href=\"", href, "\">", text, "</a></pre>\n", NULL); } if (!strcasecmp(menu, "unformatted")) { ap_rvputs(r, "<a href=\"", href, "\">", text, "</a>", NULL); } return; } static void menu_directive(request_rec *r, char *menu, char *href, char *text) { if (!strcasecmp(href, "error") || !strcasecmp(href, "nocontent")) { return; /* don't print such lines, as this isn't really an href */ } if (!strcasecmp(menu, "formatted")) { ap_rvputs(r, "<pre> <a href=\"", href, "\">", text, "</a></pre>\n", NULL); } if (!strcasecmp(menu, "semiformatted")) { ap_rvputs(r, "<pre> <a href=\"", href, "\">", text, "</a></pre>\n", NULL); } if (!strcasecmp(menu, "unformatted")) { ap_rvputs(r, "<a href=\"", href, "\">", text, "</a>", NULL); } return; } static void menu_footer(request_rec *r) { ap_rputs("\n\n</body>\n</html>\n", r); /* finish the menu */ } static int imap_handler_internal(request_rec *r) { char input[MAX_STRING_LEN]; char *directive; char *value; char *href_text; char *base; char *redirect; char *mapdflt; char *closest = NULL; double closest_yet = -1; apr_status_t status; double testpoint[2]; double pointarray[MAXVERTS + 1][2]; int vertex; char *string_pos; int showmenu = 0; imap_conf_rec *icr; char *imap_menu; char *imap_default; char *imap_base; ap_configfile_t *imap; icr = ap_get_module_config(r->per_dir_config, &imagemap_module); imap_menu = icr->imap_menu ? icr->imap_menu : IMAP_MENU_DEFAULT; imap_default = icr->imap_default ? icr->imap_default : IMAP_DEFAULT_DEFAULT; imap_base = icr->imap_base ? icr->imap_base : IMAP_BASE_DEFAULT; status = ap_pcfg_openfile(&imap, r->pool, r->filename); if (status != APR_SUCCESS) { return HTTP_NOT_FOUND; } base = imap_url(r, NULL, imap_base); /* set base according to default */ if (!base) { return HTTP_INTERNAL_SERVER_ERROR; } mapdflt = imap_url(r, NULL, imap_default); /* and default to global default */ if (!mapdflt) { return HTTP_INTERNAL_SERVER_ERROR; } testpoint[X] = get_x_coord(r->args); testpoint[Y] = get_y_coord(r->args); if ((testpoint[X] == -1 || testpoint[Y] == -1) || (testpoint[X] == 0 && testpoint[Y] == 0)) { /* if either is -1 or if both are zero (new Lynx) */ /* we don't have valid coordinates */ testpoint[X] = -1; testpoint[Y] = -1; if (strncasecmp(imap_menu, "none", 2)) { showmenu = 1; /* show the menu _unless_ ImapMenu is 'none' or 'no' */ } } if (showmenu) { /* send start of imagemap menu if we're going to */ menu_header(r, imap_menu); } while (!ap_cfg_getline(input, sizeof(input), imap)) { if (!input[0]) { if (showmenu) { menu_blank(r, imap_menu); } continue; } if (input[0] == '#') { if (showmenu) { menu_comment(r, imap_menu, input + 1); } continue; } /* blank lines and comments are ignored if we aren't printing a menu */ /* find the first two space delimited fields, recall that * ap_cfg_getline has removed leading/trailing whitespace. * * note that we're tokenizing as we go... if we were to use the * ap_getword() class of functions we would end up allocating extra * memory for every line of the map file */ string_pos = input; if (!*string_pos) { /* need at least two fields */ goto need_2_fields; } directive = string_pos; while (*string_pos && !apr_isspace(*string_pos)) { /* past directive */ ++string_pos; } if (!*string_pos) { /* need at least two fields */ goto need_2_fields; } *string_pos++ = '\0'; if (!*string_pos) { /* need at least two fields */ goto need_2_fields; } while(*string_pos && apr_isspace(*string_pos)) { /* past whitespace */ ++string_pos; } value = string_pos; while (*string_pos && !apr_isspace(*string_pos)) { /* past value */ ++string_pos; } if (apr_isspace(*string_pos)) { *string_pos++ = '\0'; } else { /* end of input, don't advance past it */ *string_pos = '\0'; } if (!strncasecmp(directive, "base", 4)) { /* base, base_uri */ base = imap_url(r, NULL, value); if (!base) { goto menu_bail; } continue; /* base is never printed to a menu */ } read_quoted(&string_pos, &href_text); if (!strcasecmp(directive, "default")) { /* default */ mapdflt = imap_url(r, NULL, value); if (!mapdflt) { goto menu_bail; } if (showmenu) { /* print the default if there's a menu */ redirect = imap_url(r, base, mapdflt); if (!redirect) { goto menu_bail; } menu_default(r, imap_menu, redirect, href_text ? href_text : mapdflt); } continue; } vertex = 0; while (vertex < MAXVERTS && sscanf(string_pos, "%lf%*[, ]%lf", &pointarray[vertex][X], &pointarray[vertex][Y]) == 2) { /* Now skip what we just read... we can't use ANSIism %n */ while (apr_isspace(*string_pos)) { /* past whitespace */ string_pos++; } while (apr_isdigit(*string_pos)) { /* and the 1st number */ string_pos++; } string_pos++; /* skip the ',' */ while (apr_isspace(*string_pos)) { /* past any more whitespace */ string_pos++; } while (apr_isdigit(*string_pos)) { /* 2nd number */ string_pos++; } vertex++; } /* so long as there are more vertices to read, and we have room, read them in. We start where we left off of the last sscanf, not at the beginning. */ pointarray[vertex][X] = -1; /* signals the end of vertices */ if (showmenu) { if (!href_text) { read_quoted(&string_pos, &href_text); /* href text could be here instead */ } redirect = imap_url(r, base, value); if (!redirect) { goto menu_bail; } menu_directive(r, imap_menu, redirect, href_text ? href_text : value); continue; } /* note that we don't make it past here if we are making a menu */ if (testpoint[X] == -1 || pointarray[0][X] == -1) { continue; /* don't try the following tests if testpoints are invalid, or if there are no coordinates */ } if (!strcasecmp(directive, "poly")) { /* poly */ if (pointinpoly(testpoint, pointarray)) { ap_cfg_closefile(imap); redirect = imap_url(r, base, value); if (!redirect) { return HTTP_INTERNAL_SERVER_ERROR; } return (imap_reply(r, redirect)); } continue; } if (!strcasecmp(directive, "circle")) { /* circle */ if (pointincircle(testpoint, pointarray)) { ap_cfg_closefile(imap); redirect = imap_url(r, base, value); if (!redirect) { return HTTP_INTERNAL_SERVER_ERROR; } return (imap_reply(r, redirect)); } continue; } if (!strcasecmp(directive, "rect")) { /* rect */ if (pointinrect(testpoint, pointarray)) { ap_cfg_closefile(imap); redirect = imap_url(r, base, value); if (!redirect) { return HTTP_INTERNAL_SERVER_ERROR; } return (imap_reply(r, redirect)); } continue; } if (!strcasecmp(directive, "point")) { /* point */ if (is_closer(testpoint, pointarray, &closest_yet)) { closest = apr_pstrdup(r->pool, value); } continue; } /* move on to next line whether it's closest or not */ } /* nothing matched, so we get another line! */ ap_cfg_closefile(imap); /* we are done with the map file; close it */ if (showmenu) { menu_footer(r); /* finish the menu and we are done */ return OK; } if (closest) { /* if a 'point' directive has been seen */ redirect = imap_url(r, base, closest); if (!redirect) { return HTTP_INTERNAL_SERVER_ERROR; } return (imap_reply(r, redirect)); } if (mapdflt) { /* a default should be defined, even if only 'nocontent' */ redirect = imap_url(r, base, mapdflt); if (!redirect) { return HTTP_INTERNAL_SERVER_ERROR; } return (imap_reply(r, redirect)); } return HTTP_INTERNAL_SERVER_ERROR; /* If we make it this far, we failed. They lose! */ need_2_fields: ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "map file %s, line %d syntax error: requires at " "least two fields", r->uri, imap->line_number); /* fall through */ menu_bail: ap_cfg_closefile(imap); if (showmenu) { /* There's not much else we can do ... we've already sent the headers * to the client. */ ap_rputs("\n\n[an internal server error occured]\n", r); menu_footer(r); return OK; } return HTTP_INTERNAL_SERVER_ERROR; } static int imap_handler(request_rec *r) { /* Optimization: skip the allocation of large local variables on the * stack (in imap_handler_internal()) on requests that aren't using * imagemaps */ if (r->method_number != M_GET || (strcmp(r->handler,IMAP_MAGIC_TYPE) && strcmp(r->handler, "imap-file"))) { return DECLINED; } else { return imap_handler_internal(r); } } static void register_hooks(apr_pool_t *p) { ap_hook_handler(imap_handler,NULL,NULL,APR_HOOK_MIDDLE); } module AP_MODULE_DECLARE_DATA imagemap_module = { STANDARD20_MODULE_STUFF, create_imap_dir_config, /* dir config creater */ merge_imap_dir_configs, /* dir merger --- default is to override */ NULL, /* server config */ NULL, /* merge server config */ imap_cmds, /* command apr_table_t */ register_hooks /* register hooks */ };
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