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-rw-r--r--WWW/Library/Implementation/HTRules.c704
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diff --git a/WWW/Library/Implementation/HTRules.c b/WWW/Library/Implementation/HTRules.c
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+/*
+ * $LynxId: HTRules.c,v 1.47 2017/07/02 19:45:22 tom Exp $
+ *
+ * Configuration manager for Hypertext Daemon HTRules.c
+ * ==========================================
+ *
+ *
+ * History:
+ * 3 Jun 91 Written TBL
+ * 10 Aug 91 Authorisation added after Daniel Martin (pass, fail)
+ * Rule order in file changed
+ * Comments allowed with # on 1st char of rule line
+ * 17 Jun 92 Bug fix: pass and fail failed if didn't contain '*' TBL
+ * 1 Sep 93 Bug fix: no memory check - Nathan Torkington
+ * BYTE_ADDRESSING removed - Arthur Secret
+ * 11 Sep 93 MD Changed %i into %d in debug printf.
+ * VMS does not recognize %i.
+ * Bug Fix: in case of PASS, only one parameter to printf.
+ * 19 Sep 93 AL Added Access Authorization stuff.
+ * 1 Nov 93 AL Added htbin.
+ * 25 May 99 KW Added redirect for lynx.
+ *
+ */
+
+#include <HTUtils.h>
+
+/* (c) CERN WorldWideWeb project 1990,91. See Copyright.html for details */
+#include <HTRules.h>
+
+#include <HTFile.h>
+#include <LYLeaks.h>
+#include <HTAAProt.h>
+
+#define LINE_LENGTH 256
+
+typedef struct _rule {
+ struct _rule *next;
+ HTRuleOp op;
+ char *pattern;
+ char *equiv;
+ char *condition_op; /* as strings - may be inefficient, */
+ char *condition; /* but this is not for a server - kw */
+} rule;
+
+#ifndef NO_RULES
+
+#include <HTTP.h> /* for redirecting_url, indirectly HTPermitRedir - kw */
+#include <LYGlobalDefs.h> /* for LYUserSpecifiedURL - kw */
+#include <LYStrings.h> /* for LYscanFloat */
+#include <LYUtils.h> /* for LYFixCursesOn - kw */
+#include <HTAlert.h>
+
+/* Global variables
+ * ----------------
+ */
+char *HTBinDir = NULL; /* Physical /htbin directory path. */
+
+ /* In future this should not be global. */
+char *HTSearchScript = NULL; /* Search script name. */
+
+/* Module-wide variables
+ * ---------------------
+ */
+
+static rule *rules = 0; /* Pointer to first on list */
+
+#ifndef PUT_ON_HEAD
+static rule *rule_tail = 0; /* Pointer to last on list */
+#endif
+
+/* Add rule to the list HTAddRule()
+ * --------------------
+ *
+ * On entry,
+ * pattern points to 0-terminated string containing a single "*"
+ * equiv points to the equivalent string with * for the
+ * place where the text matched by * goes.
+ * On exit,
+ * returns 0 if success, -1 if error.
+ */
+
+int HTAddRule(HTRuleOp op, const char *pattern,
+ const char *equiv,
+ const char *cond_op,
+ const char *cond)
+{ /* BYTE_ADDRESSING removed and memory check - AS - 1 Sep 93 */
+ rule *temp;
+ char *pPattern = NULL;
+
+ temp = typecalloc(rule);
+ if (temp == NULL)
+ outofmem(__FILE__, "HTAddRule");
+
+ if (equiv) { /* Two operands */
+ char *pEquiv = NULL;
+
+ StrAllocCopy(pEquiv, equiv);
+ temp->equiv = pEquiv;
+ } else {
+ temp->equiv = 0;
+ }
+ if (cond_op) {
+ StrAllocCopy(temp->condition_op, cond_op);
+ StrAllocCopy(temp->condition, cond);
+ }
+ StrAllocCopy(pPattern, pattern);
+ temp->pattern = pPattern;
+ temp->op = op;
+
+ if (equiv) {
+ CTRACE((tfp, "Rule: For `%s' op %d `%s'", pattern, (int) op, equiv));
+ } else {
+ CTRACE((tfp, "Rule: For `%s' op %d", pattern, (int) op));
+ }
+ if (cond_op) {
+ CTRACE((tfp, "\t%s %s\n", cond_op, NONNULL(cond)));
+ } else {
+ CTRACE((tfp, "\n"));
+ }
+
+ if (!rules) {
+#ifdef LY_FIND_LEAKS
+ atexit(HTClearRules);
+#endif
+ }
+#ifdef PUT_ON_HEAD
+ temp->next = rules;
+ rules = temp;
+#else
+ temp->next = 0;
+ if (rule_tail)
+ rule_tail->next = temp;
+ else
+ rules = temp;
+ rule_tail = temp;
+#endif
+
+ return 0;
+}
+
+/* Clear all rules HTClearRules()
+ * ---------------
+ *
+ * On exit,
+ * There are no rules
+ *
+ * See also
+ * HTAddRule()
+ */
+void HTClearRules(void)
+{
+ while (rules) {
+ rule *temp = rules;
+
+ rules = temp->next;
+ FREE(temp->pattern);
+ FREE(temp->equiv);
+ FREE(temp->condition_op);
+ FREE(temp->condition);
+ FREE(temp);
+ }
+#ifndef PUT_ON_HEAD
+ rule_tail = 0;
+#endif
+}
+
+static BOOL rule_cond_ok(rule * r)
+{
+ BOOL result;
+
+ if (!r->condition_op)
+ return YES;
+ if (strcmp(r->condition_op, "if") && strcmp(r->condition_op, "unless")) {
+ CTRACE((tfp, "....... rule ignored, unrecognized `%s'!\n",
+ r->condition_op));
+ return NO;
+ }
+ if (!strcmp(r->condition, "redirected"))
+ result = (BOOL) (redirection_attempts > 0);
+ else if (!strcmp(r->condition, "userspec"))
+ result = LYUserSpecifiedURL;
+ else {
+ CTRACE((tfp, "....... rule ignored, unrecognized `%s %s'!\n",
+ r->condition_op, NONNULL(r->condition)));
+ return NO;
+ }
+ if (!strcmp(r->condition_op, "if"))
+ return result;
+ else
+ return (BOOL) (!result);
+
+}
+
+/* Translate by rules HTTranslate()
+ * ------------------
+ *
+ * The most recently defined rules are applied first.
+ *
+ * On entry,
+ * required points to a string whose equivalent value is needed
+ * On exit,
+ * returns the address of the equivalent string allocated from
+ * the heap which the CALLER MUST FREE. If no translation
+ * occurred, then it is a copy of the original.
+ * NEW FEATURES:
+ * When a "protect" or "defprot" rule is matched,
+ * a call to HTAA_setCurrentProtection() or
+ * HTAA_setDefaultProtection() is made to notify
+ * the Access Authorization module that the file is
+ * protected, and so it knows how to handle it.
+ * -- AL
+ */
+char *HTTranslate(const char *required)
+{
+ rule *r;
+ char *current = NULL;
+ char *msgtmp = NULL;
+ const char *pMsg;
+ int proxy_none_flag = 0;
+ int permitredir_flag = 0;
+
+ StrAllocCopy(current, required);
+
+ HTAA_clearProtections(); /* Reset from previous call -- AL */
+
+ for (r = rules; r; r = r->next) {
+ char *p = r->pattern;
+ int m = 0; /* Number of characters matched against wildcard */
+ const char *q = current;
+
+ for (; *p && *q; p++, q++) { /* Find first mismatch */
+ if (*p != *q)
+ break;
+ }
+
+ if (*p == '*') { /* Match up to wildcard */
+ m = (int) strlen(q) - (int) strlen(p + 1); /* Amount to match to wildcard */
+ if (m < 0)
+ continue; /* tail is too short to match */
+ if (0 != strcmp(q + m, p + 1))
+ continue; /* Tail mismatch */
+ } else
+ /* Not wildcard */ if (*p != *q)
+ continue; /* plain mismatch: go to next rule */
+
+ if (!rule_cond_ok(r)) /* check condition, next rule if false - kw */
+ continue;
+
+ switch (r->op) { /* Perform operation */
+
+ case HT_DefProt:
+ case HT_Protect:
+#ifdef ACCESS_AUTH
+ {
+ char *local_copy = NULL;
+ char *p2;
+ char *eff_ids = NULL;
+ char *prot_file = NULL;
+
+ CTRACE((tfp, "HTRule: `%s' matched %s %s: `%s'\n",
+ current,
+ (r->op == HT_Protect ? "Protect" : "DefProt"),
+ "rule, setup",
+ (r->equiv ? r->equiv :
+ (r->op == HT_Protect ? "DEFAULT" : "NULL!!"))));
+
+ if (r->equiv) {
+ StrAllocCopy(local_copy, r->equiv);
+ p2 = local_copy;
+ prot_file = HTNextField(&p2);
+ eff_ids = HTNextField(&p2);
+ }
+
+ if (r->op == HT_Protect)
+ HTAA_setCurrentProtection(current, prot_file, eff_ids);
+ else
+ HTAA_setDefaultProtection(current, prot_file, eff_ids);
+
+ FREE(local_copy);
+
+ /* continue translating rules */
+ }
+#endif /* ACCESS_AUTH */
+ break;
+
+ case HT_UserMsg: /* Produce message immediately */
+ LYFixCursesOn("show rule message:");
+ HTUserMsg2((r->equiv ? r->equiv : "Rule: %s"), current);
+ break;
+ case HT_InfoMsg: /* Produce messages immediately */
+ case HT_Progress:
+ case HT_Alert:
+ LYFixCursesOn("show rule message:"); /* and fall through */
+ /* FALLTHRU */
+ case HT_AlwaysAlert:
+ pMsg = r->equiv ? r->equiv :
+ (r->op == HT_AlwaysAlert) ? "%s" : "Rule: %s";
+ if (StrChr(pMsg, '%')) {
+ HTSprintf0(&msgtmp, pMsg, current);
+ pMsg = msgtmp;
+ }
+ switch (r->op) { /* Actually produce message */
+ case HT_InfoMsg:
+ HTInfoMsg(pMsg);
+ break;
+ case HT_Progress:
+ HTProgress(pMsg);
+ break;
+ case HT_Alert:
+ HTAlert(pMsg);
+ break;
+ case HT_AlwaysAlert:
+ HTAlwaysAlert("Rule alert:", pMsg);
+ break;
+ default:
+ break;
+ }
+ FREE(msgtmp);
+ break;
+
+ case HT_PermitRedir: /* Set special flag */
+ permitredir_flag = 1;
+ CTRACE((tfp, "HTRule: Mark for redirection permitted\n"));
+ break;
+
+ case HT_Pass: /* Authorised */
+ if (!r->equiv) {
+ if (proxy_none_flag) {
+ char *temp = NULL;
+
+ StrAllocCopy(temp, "NoProxy=");
+ StrAllocCat(temp, current);
+ FREE(current);
+ current = temp;
+ }
+ CTRACE((tfp, "HTRule: Pass `%s'\n", current));
+ return current;
+ }
+ /* FALLTHRU */
+
+ case HT_Map:
+ case HT_Redirect:
+ case HT_RedirectPerm:
+ if (*p == *q) { /* End of both strings, no wildcard */
+ CTRACE((tfp, "For `%s' using `%s'\n", current, r->equiv));
+ StrAllocCopy(current, r->equiv); /* use entire translation */
+ } else {
+ char *ins = StrChr(r->equiv, '*'); /* Insertion point */
+
+ if (ins) { /* Consistent rule!!! */
+ char *temp = NULL;
+
+ HTSprintf0(&temp, "%.*s%.*s%s",
+ (int) (ins - r->equiv),
+ r->equiv,
+ m,
+ q,
+ ins + 1);
+ CTRACE((tfp, "For `%s' using `%s'\n",
+ current, temp));
+ FREE(current);
+ current = temp; /* Use this */
+
+ } else { /* No insertion point */
+ char *temp = NULL;
+
+ StrAllocCopy(temp, r->equiv);
+ CTRACE((tfp, "For `%s' using `%s'\n",
+ current, temp));
+ FREE(current);
+ current = temp; /* Use this */
+ } /* If no insertion point exists */
+ }
+ if (r->op == HT_Pass) {
+ if (proxy_none_flag) {
+ char *temp = NULL;
+
+ StrAllocCopy(temp, "NoProxy=");
+ StrAllocCat(temp, current);
+ FREE(current);
+ current = temp;
+ }
+ CTRACE((tfp, "HTRule: ...and pass `%s'\n",
+ current));
+ return current;
+ } else if (r->op == HT_Redirect) {
+ CTRACE((tfp, "HTRule: ...and redirect to `%s'\n",
+ current));
+ redirecting_url = current;
+ HTPermitRedir = (BOOL) (permitredir_flag == 1);
+ return (char *) 0;
+ } else if (r->op == HT_RedirectPerm) {
+ CTRACE((tfp, "HTRule: ...and redirect like 301 to `%s'\n",
+ current));
+ redirecting_url = current;
+ permanent_redirection = TRUE;
+ HTPermitRedir = (BOOL) (permitredir_flag == 1);
+ return (char *) 0;
+ }
+ break;
+
+ case HT_UseProxy:
+ if (r->equiv && 0 == strcasecomp(r->equiv, "none")) {
+ CTRACE((tfp, "For `%s' will not use proxy\n", current));
+ proxy_none_flag = 1;
+ } else if (proxy_none_flag) {
+ CTRACE((tfp, "For `%s' proxy server ignored: %s\n",
+ current,
+ NONNULL(r->equiv)));
+ } else {
+ char *temp = NULL;
+
+ StrAllocCopy(temp, "Proxied=");
+ StrAllocCat(temp, r->equiv);
+ StrAllocCat(temp, current);
+ CTRACE((tfp, "HTRule: proxy server found: %s\n",
+ NONNULL(r->equiv)));
+ FREE(current);
+ return temp;
+ }
+ break;
+
+ case HT_Invalid:
+ case HT_Fail: /* Unauthorised */
+ CTRACE((tfp, "HTRule: *** FAIL `%s'\n", current));
+ FREE(current);
+ return (char *) 0;
+ } /* if tail matches ... switch operation */
+
+ } /* loop over rules */
+
+ if (proxy_none_flag) {
+ char *temp = NULL;
+
+ StrAllocCopy(temp, "NoProxy=");
+ StrAllocCat(temp, current);
+ FREE(current);
+ return temp;
+ }
+
+ return current;
+}
+
+/* Load one line of configuration
+ * ------------------------------
+ *
+ * Call this, for example, to load a X resource with config info.
+ *
+ * returns 0 OK, < 0 syntax error.
+ */
+int HTSetConfiguration(char *config)
+{
+ HTRuleOp op;
+ char *line = NULL;
+ char *pointer = NULL;
+ char *word1;
+ const char *word2;
+ const char *word3;
+ const char *cond_op = NULL;
+ const char *cond = NULL;
+ float quality, secs, secs_per_byte;
+ long maxbytes;
+ int status;
+
+ StrAllocCopy(line, config);
+ if (line != NULL) {
+ char *p = line;
+
+ /* Chop off comments */
+ while ((p = StrChr(p, '#'))) {
+ if (p == line || isspace(UCH(*(p - 1)))) {
+ *p = 0;
+ break;
+ } else {
+ p++;
+ }
+ }
+ }
+ pointer = line;
+ word1 = HTNextField(&pointer);
+ if (!word1) {
+ FREE(line);
+ return 0;
+ }; /* Comment only or blank */
+
+ word2 = HTNextField(&pointer);
+
+ if (0 == strcasecomp(word1, "defprot") ||
+ 0 == strcasecomp(word1, "protect"))
+ word3 = pointer; /* The rest of the line to be parsed by AA module */
+ else
+ word3 = HTNextField(&pointer); /* Just the next word */
+
+ if (!word2) {
+ fprintf(stderr, "HTRule: %s %s\n", RULE_NEEDS_DATA, line);
+ FREE(line);
+ return -2; /*syntax error */
+ }
+
+ if (0 == strcasecomp(word1, "suffix")) {
+ char *encoding = HTNextField(&pointer);
+
+ status = 0;
+ if (pointer)
+ status = LYscanFloat(pointer, &quality);
+
+ HTSetSuffix(word2, word3,
+ encoding ? encoding : "binary",
+ status >= 1 ? quality : (float) 1.0);
+
+ } else if (0 == strcasecomp(word1, "presentation")) {
+ status = 0;
+ if (pointer) {
+ const char *temp = pointer;
+
+ if (LYscanFloat2(&temp, &quality)) {
+ status = 1;
+ if (LYscanFloat2(&temp, &secs)) {
+ status = 2;
+ if (LYscanFloat2(&temp, &secs_per_byte)) {
+ status = 3;
+ if (sscanf(temp, "%ld", &maxbytes)) {
+ status = 4;
+ }
+ }
+ }
+ }
+ }
+
+ HTSetPresentation(word2, word3, NULL,
+ status >= 1 ? quality : 1.0,
+ status >= 2 ? secs : 0.0,
+ status >= 3 ? secs_per_byte : 0.0,
+ status >= 4 ? maxbytes : 0,
+ mediaCFG);
+
+ } else if (0 == strncasecomp(word1, "htbin", 5) ||
+ 0 == strncasecomp(word1, "bindir", 6)) {
+ StrAllocCopy(HTBinDir, word2); /* Physical /htbin location */
+
+ } else if (0 == strncasecomp(word1, "search", 6)) {
+ StrAllocCopy(HTSearchScript, word2); /* Search script name */
+
+ } else {
+ op = 0 == strcasecomp(word1, "map") ? HT_Map
+ : 0 == strcasecomp(word1, "pass") ? HT_Pass
+ : 0 == strcasecomp(word1, "fail") ? HT_Fail
+ : 0 == strcasecomp(word1, "redirect") ? HT_Redirect
+ : 0 == strncasecomp(word1, "redirectperm", 12) ? HT_RedirectPerm
+ : 0 == strcasecomp(word1, "redirecttemp") ? HT_Redirect
+ : 0 == strcasecomp(word1, "permitredirection") ? HT_PermitRedir
+ : 0 == strcasecomp(word1, "useproxy") ? HT_UseProxy
+ : 0 == strcasecomp(word1, "alert") ? HT_Alert
+ : 0 == strcasecomp(word1, "alwaysalert") ? HT_AlwaysAlert
+ : 0 == strcasecomp(word1, "progress") ? HT_Progress
+ : 0 == strcasecomp(word1, "usermsg") ? HT_UserMsg
+ : 0 == strcasecomp(word1, "infomsg") ? HT_InfoMsg
+ : 0 == strcasecomp(word1, "defprot") ? HT_DefProt
+ : 0 == strcasecomp(word1, "protect") ? HT_Protect
+ : HT_Invalid;
+ if (op == HT_Invalid) {
+ fprintf(stderr, "HTRule: %s '%s'\n", RULE_INCORRECT, config);
+ } else {
+ switch (op) {
+ case HT_Fail: /* never a or other 2nd parameter */
+ case HT_PermitRedir:
+ cond_op = word3;
+ if (cond_op && *cond_op) {
+ word3 = NULL;
+ cond = HTNextField(&pointer);
+ }
+ break;
+
+ case HT_Pass: /* possibly a URL2 */
+ if (word3 && (!strcasecomp(word3, "if") ||
+ !strcasecomp(word3, "unless"))) {
+ cond_op = word3;
+ word3 = NULL;
+ cond = HTNextField(&pointer);
+ break;
+ }
+ /* else fall through */
+ case HT_Map: /* always a URL2 (or other 2nd parameter) */
+ case HT_Redirect:
+ case HT_RedirectPerm:
+ case HT_UseProxy:
+ cond_op = HTNextField(&pointer);
+ /* check for extra status word in "Redirect" */
+ if (op == HT_Redirect && 0 == strcasecomp(word1, "redirect") &&
+ cond_op &&
+ strcasecomp(cond_op, "if") &&
+ strcasecomp(cond_op, "unless")) {
+ if (0 == strcmp(word2, "301") ||
+ 0 == strcasecomp(word2, "permanent")) {
+ op = HT_RedirectPerm;
+ } else if (!(0 == strcmp(word2, "302") ||
+ 0 == strcmp(word2, "303") ||
+ 0 == strcasecomp(word2, "temp") ||
+ 0 == strcasecomp(word2, "seeother"))) {
+ CTRACE((tfp, "Rule: Ignoring `%s' in Redirect\n", word2));
+ }
+ word2 = word3;
+ word3 = cond_op; /* cond_op isn't condition op after all */
+ cond_op = HTNextField(&pointer);
+ }
+ if (cond_op && *cond_op)
+ cond = HTNextField(&pointer);
+ break;
+
+ case HT_Progress:
+ case HT_InfoMsg:
+ case HT_UserMsg:
+ case HT_Alert:
+ case HT_AlwaysAlert:
+ cond_op = HTNextField(&pointer);
+ if (cond_op && *cond_op)
+ cond = HTNextField(&pointer);
+ if (word3) { /* Fix string with too may %s - kw */
+ const char *cp = word3;
+ char *cp1, *cp2;
+
+ while ((cp1 = StrChr(cp, '%'))) {
+ if (cp1[1] == '\0') {
+ *cp1 = '\0';
+ break;
+ } else if (cp1[1] == '%') {
+ cp = cp1 + 2;
+ continue;
+ } else
+ while ((cp2 = StrChr(cp1 + 2, '%'))) {
+ if (cp2[1] == '\0') {
+ *cp2 = '\0';
+ break;
+ } else if (cp2[1] == '%') {
+ cp1 = cp2;
+ } else {
+ *cp2 = '?'; /* replace bad % */
+ cp1 = cp2;
+ }
+ }
+ break;
+ }
+ }
+ break;
+
+ default:
+ break;
+ }
+ if (cond_op && cond && *cond && !strcasecomp(cond_op, "unless")) {
+ cond_op = "unless";
+ } else if (cond_op && cond && *cond &&
+ !strcasecomp(cond_op, "if")) {
+ cond_op = "if";
+ } else if (cond_op || cond) {
+ fprintf(stderr, "HTRule: %s '%s'\n", RULE_INCORRECT, config);
+ FREE(line); /* syntax error, condition is a mess - kw */
+ return -2; /* NB unrecognized cond passes here - kw */
+ }
+ if (cond && !strncasecomp(cond, "redirected", (int) strlen(cond))) {
+ cond = "redirected"; /* recognized, canonical case - kw */
+ } else if (cond && strlen(cond) >= 8 &&
+ !strncasecomp(cond, "userspecified", (int) strlen(cond))) {
+ cond = "userspec"; /* also allow abbreviation - kw */
+ }
+ HTAddRule(op, word2, word3, cond_op, cond);
+ }
+ }
+ FREE(line);
+ return 0;
+}
+
+/* Load the rules from a file HTLoadRules()
+ * --------------------------
+ *
+ * On entry,
+ * Rules can be in any state
+ * On exit,
+ * Any existing rules will have been kept.
+ * Any new rules will have been loaded.
+ * Returns 0 if no error, 0 if error!
+ *
+ * Bugs:
+ * The strings may not contain spaces.
+ */
+
+int HTLoadRules(const char *filename)
+{
+ FILE *fp = fopen(filename, TXT_R);
+ char line[LINE_LENGTH + 1];
+
+ if (!fp) {
+ CTRACE((tfp, "HTRules: Can't open rules file %s\n", filename));
+ return -1; /* File open error */
+ }
+ for (;;) {
+ if (!fgets(line, LINE_LENGTH + 1, fp))
+ break; /* EOF or error */
+ (void) HTSetConfiguration(line);
+ }
+ fclose(fp);
+ return 0; /* No error or syntax errors ignored */
+}
+
+#endif /* NO_RULES */
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