1 files changed, 453 insertions, 0 deletions

diff --git a/src/http_conv.c b/src/http_conv.c
new file mode 100644
index 0000000..f33336a
--- /dev/null
+++ b/src/http_conv.c
@@ -0,0 +1,453 @@
+/*
+ * HTTP sample conversion
+ *
+ * Copyright 2000-2018 Willy Tarreau <w@1wt.eu>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <sys/types.h>
+
+#include <ctype.h>
+#include <string.h>
+#include <time.h>
+
+#include <haproxy/api.h>
+#include <haproxy/arg.h>
+#include <haproxy/capture-t.h>
+#include <haproxy/chunk.h>
+#include <haproxy/http.h>
+#include <haproxy/pool.h>
+#include <haproxy/sample.h>
+#include <haproxy/stream.h>
+#include <haproxy/tools.h>
+#include <haproxy/version.h>
+
+static int smp_check_http_date_unit(struct arg *args, struct sample_conv *conv,
+                                    const char *file, int line, char **err)
+{
+    return smp_check_date_unit(args, err);
+}
+
+/* takes an UINT value on input supposed to represent the time since EPOCH,
+ * adds an optional offset found in args[0] and emits a string representing
+ * the date in RFC-1123/5322 format. If optional unit param in args[1] is
+ * provided, decode timestamp in milliseconds ("ms") or microseconds("us"),
+ * and use relevant output date format.
+ */
+static int sample_conv_http_date(const struct arg *args, struct sample *smp, void *private)
+{
+	const char day[7][4] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
+	const char mon[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
+	struct buffer *temp;
+	struct tm tm;
+	int sec_frac = 0;
+	time_t curr_date;
+
+	/* add offset */
+	if (args[0].type == ARGT_SINT)
+		smp->data.u.sint += args[0].data.sint;
+
+        /* report in milliseconds */
+        if (args[1].type == ARGT_SINT && args[1].data.sint == TIME_UNIT_MS) {
+		sec_frac = smp->data.u.sint % 1000;
+                smp->data.u.sint /= 1000;
+        }
+        /* report in microseconds */
+        else if (args[1].type == ARGT_SINT && args[1].data.sint == TIME_UNIT_US) {
+		sec_frac = smp->data.u.sint % 1000000;
+                smp->data.u.sint /= 1000000;
+        }
+
+	/* With high numbers, the date returned can be negative, the 55 bits mask prevent this. */
+	curr_date = smp->data.u.sint & 0x007fffffffffffffLL;
+
+	get_gmtime(curr_date, &tm);
+
+	temp = get_trash_chunk();
+	if (args[1].type == ARGT_SINT && args[1].data.sint != TIME_UNIT_S) {
+	    temp->data = snprintf(temp->area, temp->size - temp->data,
+	                          "%s, %02d %s %04d %02d:%02d:%02d.%d GMT",
+			          day[tm.tm_wday], tm.tm_mday, mon[tm.tm_mon],
+			          1900+tm.tm_year,
+			          tm.tm_hour, tm.tm_min, tm.tm_sec, sec_frac);
+	} else {
+	    temp->data = snprintf(temp->area, temp->size - temp->data,
+	                          "%s, %02d %s %04d %02d:%02d:%02d GMT",
+			          day[tm.tm_wday], tm.tm_mday, mon[tm.tm_mon],
+			          1900+tm.tm_year,
+			          tm.tm_hour, tm.tm_min, tm.tm_sec);
+        }
+
+	smp->data.u.str = *temp;
+	smp->data.type = SMP_T_STR;
+	return 1;
+}
+
+/* Arguments: The list of expected value, the number of parts returned and the separator */
+static int sample_conv_q_preferred(const struct arg *args, struct sample *smp, void *private)
+{
+	const char *al = smp->data.u.str.area;
+	const char *end = al + smp->data.u.str.data;
+	const char *token;
+	int toklen;
+	int qvalue;
+	const char *str;
+	const char *w;
+	int best_q = 0;
+
+	/* Set the constant to the sample, because the output of the
+	 * function will be peek in the constant configuration string.
+	 */
+	smp->flags |= SMP_F_CONST;
+	smp->data.u.str.size = 0;
+	smp->data.u.str.area = "";
+	smp->data.u.str.data = 0;
+
+	/* Parse the accept language */
+	while (1) {
+
+		/* Jump spaces, quit if the end is detected. */
+		while (al < end && isspace((unsigned char)*al))
+			al++;
+		if (al >= end)
+			break;
+
+		/* Start of the first word. */
+		token = al;
+
+		/* Look for separator: isspace(), ',' or ';'. Next value if 0 length word. */
+		while (al < end && *al != ';' && *al != ',' && !isspace((unsigned char)*al))
+			al++;
+		if (al == token)
+			goto expect_comma;
+
+		/* Length of the token. */
+		toklen = al - token;
+		qvalue = 1000;
+
+		/* Check if the token exists in the list. If the token not exists,
+		 * jump to the next token.
+		 */
+		str = args[0].data.str.area;
+		w = str;
+		while (1) {
+			if (*str == ';' || *str == '\0') {
+				if (http_language_range_match(token, toklen, w, str - w))
+					goto look_for_q;
+				if (*str == '\0')
+					goto expect_comma;
+				w = str + 1;
+			}
+			str++;
+		}
+		goto expect_comma;
+
+look_for_q:
+
+		/* Jump spaces, quit if the end is detected. */
+		while (al < end && isspace((unsigned char)*al))
+			al++;
+		if (al >= end)
+			goto process_value;
+
+		/* If ',' is found, process the result */
+		if (*al == ',')
+			goto process_value;
+
+		/* If the character is different from ';', look
+		 * for the end of the header part in best effort.
+		 */
+		if (*al != ';')
+			goto expect_comma;
+
+		/* Assumes that the char is ';', now expect "q=". */
+		al++;
+
+		/* Jump spaces, process value if the end is detected. */
+		while (al < end && isspace((unsigned char)*al))
+			al++;
+		if (al >= end)
+			goto process_value;
+
+		/* Expect 'q'. If no 'q', continue in best effort */
+		if (*al != 'q')
+			goto process_value;
+		al++;
+
+		/* Jump spaces, process value if the end is detected. */
+		while (al < end && isspace((unsigned char)*al))
+			al++;
+		if (al >= end)
+			goto process_value;
+
+		/* Expect '='. If no '=', continue in best effort */
+		if (*al != '=')
+			goto process_value;
+		al++;
+
+		/* Jump spaces, process value if the end is detected. */
+		while (al < end && isspace((unsigned char)*al))
+			al++;
+		if (al >= end)
+			goto process_value;
+
+		/* Parse the q value. */
+		qvalue = http_parse_qvalue(al, &al);
+
+process_value:
+
+		/* If the new q value is the best q value, then store the associated
+		 * language in the response. If qvalue is the biggest value (1000),
+		 * break the process.
+		 */
+		if (qvalue > best_q) {
+			smp->data.u.str.area = (char *)w;
+			smp->data.u.str.data = str - w;
+			if (qvalue >= 1000)
+				break;
+			best_q = qvalue;
+		}
+
+expect_comma:
+
+		/* Expect comma or end. If the end is detected, quit the loop. */
+		while (al < end && *al != ',')
+			al++;
+		if (al >= end)
+			break;
+
+		/* Comma is found, jump it and restart the analyzer. */
+		al++;
+	}
+
+	/* Set default value if required. */
+	if (smp->data.u.str.data == 0 && args[1].type == ARGT_STR) {
+		smp->data.u.str.area = args[1].data.str.area;
+		smp->data.u.str.data = args[1].data.str.data;
+	}
+
+	/* Return true only if a matching language was found. */
+	return smp->data.u.str.data != 0;
+}
+
+/* This fetch url-decode any input string. */
+static int sample_conv_url_dec(const struct arg *args, struct sample *smp, void *private)
+{
+	int in_form = 0;
+	int len;
+
+	/* If the constant flag is set or if not size is available at
+	 * the end of the buffer, copy the string in other buffer
+	  * before decoding.
+	 */
+	if (smp->flags & SMP_F_CONST || smp->data.u.str.size <= smp->data.u.str.data) {
+		struct buffer *str = get_trash_chunk();
+		memcpy(str->area, smp->data.u.str.area, smp->data.u.str.data);
+		smp->data.u.str.area = str->area;
+		smp->data.u.str.size = str->size;
+		smp->flags &= ~SMP_F_CONST;
+	}
+
+	/* Add final \0 required by url_decode(), and convert the input string. */
+	smp->data.u.str.area[smp->data.u.str.data] = '\0';
+
+	if (args[0].type == ARGT_SINT)
+		in_form = !!args[0].data.sint;
+
+	len = url_decode(smp->data.u.str.area, in_form);
+	if (len < 0)
+		return 0;
+	smp->data.u.str.data = len;
+	return 1;
+}
+
+/* url-encode types and encode maps */
+enum encode_type {
+	ENC_QUERY = 0,
+};
+long query_encode_map[(256 / 8) / sizeof(long)];
+
+/* Check url-encode type */
+static int sample_conv_url_enc_check(struct arg *arg, struct sample_conv *conv,
+				     const char *file, int line, char **err)
+{
+	enum encode_type enc_type;
+
+	if (strcmp(arg->data.str.area, "") == 0)
+		enc_type = ENC_QUERY;
+	else if (strcmp(arg->data.str.area, "query") == 0)
+		enc_type = ENC_QUERY;
+	else {
+		memprintf(err, "Unexpected encode type. "
+			  "Allowed value is 'query'");
+		return 0;
+	}
+
+	chunk_destroy(&arg->data.str);
+	arg->type = ARGT_SINT;
+	arg->data.sint = enc_type;
+	return 1;
+}
+
+/* Initializes some url encode data at boot */
+static void sample_conf_url_enc_init()
+{
+	int i;
+
+	memset(query_encode_map, 0, sizeof(query_encode_map));
+	/* use rfc3986 to determine list of characters to keep unchanged for
+	 * query string */
+	for (i = 0; i < 256; i++) {
+		if (!((i >= 'a' && i <= 'z') || (i >= 'A' && i <= 'Z')
+		    || (i >= '0' && i <= '9') ||
+		    i == '-' || i == '.' || i == '_' || i == '~'))
+			ha_bit_set(i, query_encode_map);
+	}
+}
+
+INITCALL0(STG_PREPARE, sample_conf_url_enc_init);
+
+/* This fetch url-encode any input string. Only support query string for now */
+static int sample_conv_url_enc(const struct arg *args, struct sample *smp, void
+		*private)
+{
+	enum encode_type enc_type;
+	struct buffer *trash = get_trash_chunk();
+	long *encode_map;
+	char *ret;
+
+	enc_type = ENC_QUERY;
+	enc_type = args->data.sint;
+
+	if (enc_type == ENC_QUERY)
+		encode_map = query_encode_map;
+	else
+		return 0;
+
+	ret = encode_chunk(trash->area, trash->area + trash->size, '%',
+			   encode_map, &smp->data.u.str);
+	if (ret == NULL || *ret != '\0')
+		return 0;
+	trash->data = ret - trash->area;
+	smp->data.u.str = *trash;
+	return 1;
+}
+
+static int smp_conv_req_capture(const struct arg *args, struct sample *smp, void *private)
+{
+	struct proxy *fe;
+	int idx, i;
+	struct cap_hdr *hdr;
+	int len;
+
+	if (args->type != ARGT_SINT)
+		return 0;
+
+	if (!smp->strm)
+		return 0;
+
+	fe = strm_fe(smp->strm);
+	idx = args->data.sint;
+
+	/* Check the availibity of the capture id. */
+	if (idx > fe->nb_req_cap - 1)
+		return 0;
+
+	/* Look for the original configuration. */
+	for (hdr = fe->req_cap, i = fe->nb_req_cap - 1;
+	     hdr != NULL && i != idx ;
+	     i--, hdr = hdr->next);
+	if (!hdr)
+		return 0;
+
+	/* check for the memory allocation */
+	if (smp->strm->req_cap[hdr->index] == NULL)
+		smp->strm->req_cap[hdr->index] = pool_alloc(hdr->pool);
+	if (smp->strm->req_cap[hdr->index] == NULL)
+		return 0;
+
+	/* Check length. */
+	len = smp->data.u.str.data;
+	if (len > hdr->len)
+		len = hdr->len;
+
+	/* Capture input data. */
+	memcpy(smp->strm->req_cap[idx], smp->data.u.str.area, len);
+	smp->strm->req_cap[idx][len] = '\0';
+
+	return 1;
+}
+
+static int smp_conv_res_capture(const struct arg *args, struct sample *smp, void *private)
+{
+	struct proxy *fe;
+	int idx, i;
+	struct cap_hdr *hdr;
+	int len;
+
+	if (args->type != ARGT_SINT)
+		return 0;
+
+	if (!smp->strm)
+		return 0;
+
+	fe = strm_fe(smp->strm);
+	idx = args->data.sint;
+
+	/* Check the availibity of the capture id. */
+	if (idx > fe->nb_rsp_cap - 1)
+		return 0;
+
+	/* Look for the original configuration. */
+	for (hdr = fe->rsp_cap, i = fe->nb_rsp_cap - 1;
+	     hdr != NULL && i != idx ;
+	     i--, hdr = hdr->next);
+	if (!hdr)
+		return 0;
+
+	/* check for the memory allocation */
+	if (smp->strm->res_cap[hdr->index] == NULL)
+		smp->strm->res_cap[hdr->index] = pool_alloc(hdr->pool);
+	if (smp->strm->res_cap[hdr->index] == NULL)
+		return 0;
+
+	/* Check length. */
+	len = smp->data.u.str.data;
+	if (len > hdr->len)
+		len = hdr->len;
+
+	/* Capture input data. */
+	memcpy(smp->strm->res_cap[idx], smp->data.u.str.area, len);
+	smp->strm->res_cap[idx][len] = '\0';
+
+	return 1;
+}
+
+/************************************************************************/
+/*        All supported converter keywords must be declared here.       */
+/************************************************************************/
+
+/* Note: must not be declared <const> as its list will be overwritten */
+static struct sample_conv_kw_list sample_conv_kws = {ILH, {
+	{ "http_date",      sample_conv_http_date,    ARG2(0,SINT,STR),     smp_check_http_date_unit,   SMP_T_SINT, SMP_T_STR},
+	{ "language",       sample_conv_q_preferred,  ARG2(1,STR,STR),  NULL,   SMP_T_STR,  SMP_T_STR},
+	{ "capture-req",    smp_conv_req_capture,     ARG1(1,SINT),     NULL,   SMP_T_STR,  SMP_T_STR},
+	{ "capture-res",    smp_conv_res_capture,     ARG1(1,SINT),     NULL,   SMP_T_STR,  SMP_T_STR},
+	{ "url_dec",        sample_conv_url_dec,      ARG1(0,SINT),     NULL,   SMP_T_STR,  SMP_T_STR},
+	{ "url_enc",        sample_conv_url_enc,      ARG1(1,STR),      sample_conv_url_enc_check, SMP_T_STR,  SMP_T_STR},
+	{ NULL, NULL, 0, 0, 0 },
+}};
+
+INITCALL1(STG_REGISTER, sample_register_convs, &sample_conv_kws);
+
+/*
+ * Local variables:
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ * End:
+ */