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plugin/business/pangu-http/src/pattern_replace.cpp

@@ -0,0 +1,242 @@
+#include "pattern_replace.h"
+
+#include <tfe_utils.h>
+
+#define PCRE2_CODE_UNIT_WIDTH 8
+#include <pcre2.h>
+
+#include <string.h>
+#include <sys/types.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#define	MAX_EDIT_MATCHES			16
+
+enum replace_zone zone_name_to_id(const char * name)
+{
+	const char * std_name[] = {"http_req_uri",
+		"http_req_header",
+		"http_req_body",
+		"http_resp_header",
+		"http_resp_body",
+		"http_resp_body"};
+	size_t i = 0;
+	for (i = 0; i < sizeof(std_name) / sizeof(const char *); i++)
+	{
+		if (0 == strcasecmp(name, std_name[i]))
+		{
+			break;
+		}
+	}
+	return (enum replace_zone) i;
+}
+static char * strchr_esc(char * s, const char delim)
+{
+	char * token;
+	if (s == NULL)
+		return NULL;
+	for (token = s; *token != '\0'; token++)
+	{
+		if (*token == '\\')
+		{
+			token++;
+			continue;
+		}
+		if (*token == delim)
+			break;
+	}
+	if (*token == '\0')
+	{
+		return NULL;
+	}
+	else
+	{
+		return token;
+	}
+}
+static char * strtok_r_esc(char * s, const char delim, char ** save_ptr)
+{
+	char * token;
+
+	if (s == NULL) s = *save_ptr;
+
+	/* Scan leading delimiters.  */
+	token = strchr_esc(s, delim);
+	if (token == NULL)
+	{
+		*save_ptr = token;
+		return s;
+	}
+	/* Find the end of the token.  */
+	*token = '\0';
+	token++;
+	*save_ptr = token;
+
+	return s;
+}
+
+
+size_t format_replace_rule(const char * exec_para, struct replace_rule * replace, size_t n_replace)
+{
+	char * tmp = ALLOC(char, strlen(exec_para) + 1);
+	char * token = NULL, * sub_token = NULL, * saveptr = NULL, * saveptr2 = NULL;
+	size_t idx = 0;
+
+	const char * str_zone = "zone=";
+	const char * str_subs = "substitute=";
+	memcpy(tmp, exec_para, strlen(exec_para));
+
+	for (token = tmp;; token = NULL)
+	{
+		sub_token = strtok_r(token, ";", &saveptr);
+		if (sub_token == NULL) break;
+
+		if (0 == strncasecmp(sub_token, str_zone, strlen(str_zone)))
+		{
+			replace[idx].zone = zone_name_to_id(sub_token + strlen(str_zone));
+			if (replace[idx].zone == kZoneMax)
+			{
+				break;
+			}
+		}
+
+		sub_token = strtok_r(NULL, ";", &saveptr);
+		if (0 == strncasecmp(sub_token, str_subs, strlen(str_subs)))
+		{
+			sub_token += strlen(str_subs) + 1;
+			replace[idx].find = tfe_strdup(strtok_r_esc(sub_token, '/', &saveptr2));
+			replace[idx].replace_with = tfe_strdup(strtok_r_esc(NULL, '/', &saveptr2));
+
+			idx++;
+			if (idx == n_replace)
+			{
+				break;
+			}
+		}
+	}
+
+	free(tmp);
+	tmp = NULL;
+	return idx;
+}
+
+size_t select_replace_rule(enum replace_zone zone, const struct replace_rule * replace, size_t n_replace,
+	const struct replace_rule ** selected, size_t n_selected)
+{
+	size_t i = 0, j = 0;
+	for (i = 0; i < n_replace && j < n_selected; i++)
+	{
+		if (replace[i].zone == zone)
+		{
+			selected[j] = replace + i;
+			j++;
+		}
+	}
+	return j;
+}
+
+size_t replace_string(const char * in, size_t in_sz, const struct replace_rule * zone, char** out)
+{
+	size_t replace_len = strlen(zone->replace_with);
+
+	assert(strlen(zone->find) != 0);
+
+    int error;
+    PCRE2_SIZE erroffset;
+
+    const PCRE2_SPTR pattern = (PCRE2_SPTR)zone->find;
+    const PCRE2_SPTR subject = (PCRE2_SPTR)in;
+    const PCRE2_SPTR replacement = (PCRE2_SPTR)zone->replace_with;
+
+    pcre2_code *re = pcre2_compile(pattern, PCRE2_ZERO_TERMINATED, 0, &error, &erroffset, 0);
+    if (re == 0)
+        return -1;
+
+    pcre2_jit_compile(re, PCRE2_JIT_COMPLETE);
+
+    PCRE2_SIZE outbuff_size = in_sz+sizeof(replacement)*MAX_EDIT_MATCHES;
+	PCRE2_SIZE outlen = 0;
+	PCRE2_UCHAR* out_buffer = NULL;
+not_enough_mem_retry:
+    out_buffer = (PCRE2_UCHAR*)malloc(sizeof(PCRE2_UCHAR)*outbuff_size);
+	outlen = outbuff_size;
+    int rc = pcre2_substitute(re, subject, in_sz, 0, PCRE2_SUBSTITUTE_GLOBAL | PCRE2_SUBSTITUTE_EXTENDED | PCRE2_SUBSTITUTE_OVERFLOW_LENGTH, 0, 0, replacement, PCRE2_ZERO_TERMINATED, out_buffer, &outlen);
+	if(outlen>outbuff_size)
+	{
+		outbuff_size=outlen;
+		free(out_buffer);
+		out_buffer=NULL;
+		goto not_enough_mem_retry;		
+	}
+	if(rc<=0)
+	{
+		free(out_buffer);
+		outlen=rc;
+	}
+	else
+	{
+		*out=(char*)out_buffer;
+	}
+	pcre2_code_free(re);
+	return outlen;
+}
+
+size_t execute_replace_rule(const char * in, size_t in_sz,
+	enum replace_zone zone, const struct replace_rule * rules, size_t n_rule, char** out)
+{
+	const struct replace_rule * todo[n_rule];
+	size_t n_todo = 0, i = 0, interator_sz=0, pre_out_sz=0;
+	const char * interator = NULL;
+	char* new_out = NULL, * pre_out = NULL;
+	size_t output_size=0;
+	if (in_sz == 0 || in==NULL)
+	{
+		return 0;
+	}
+	n_todo = select_replace_rule(zone, rules, n_rule, todo, n_rule);
+	interator = in;
+	interator_sz = in_sz;
+	for (i = 0; i < n_todo; i++)
+	{
+		output_size = replace_string(interator, interator_sz, todo[i], &new_out);
+		if (output_size == 0)
+		{
+			continue;
+		}
+		if (pre_out != NULL)
+		{
+			free(pre_out);
+			pre_out = NULL;
+		}
+		pre_out = new_out;
+		pre_out_sz = output_size;
+		
+		interator = new_out;
+		interator_sz = output_size;
+		
+		new_out=NULL;
+		output_size=0;
+	}
+	if(pre_out_sz>0)
+	{
+		*out=pre_out;
+		return pre_out_sz;
+	}
+	else
+	{
+		return 0;
+	}
+}
+void simple_replace(const char* find, const char* replacement, const char* input, size_t in_sz, char** output, size_t *output_sz)
+{
+	char* exec_para=NULL;
+	asprintf(&exec_para,"zone=http_resp_body;substitute=/%s/%s", find, replacement);
+	size_t n_got_rule=0;
+	struct replace_rule rules[16];
+	n_got_rule=format_replace_rule(exec_para, rules, sizeof(rules)/sizeof(rules[0]));
+	*output_sz=execute_replace_rule(input, strlen(input), kZoneResponseBody, rules, n_got_rule, output);
+	free(exec_para);
+	return;
+}
+
+