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MINOR: http-htx: Add understandable errors for the errorfiles parsing

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No details are provided when an error occurs during the parsing of an errorfile,
Thus it is a bit hard to diagnose where the problem is. Now, when it happens, an
understandable error message is reported.

This patch is not a bug fix in itself. But it will be required to change an
fatal error into a warning in last stable releases. Thus it must be backported
as far as 2.0.
This commit is contained in:
Christopher Faulet 2020-11-05 22:43:41 +01:00
parent 6d27a92b83
commit a66adf41ea
2 changed files with 58 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/haproxy/http_htx.h
View File

@ -59,7 +59,7 @@ unsigned int http_get_htx_hdr(const struct htx *htx, const struct ist hdr,
int occ, struct http_hdr_ctx *ctx, char **vptr, size_t *vlen);
unsigned int http_get_htx_fhdr(const struct htx *htx, const struct ist hdr,
int occ, struct http_hdr_ctx *ctx, char **vptr, size_t *vlen);
int http_str_to_htx(struct buffer *buf, struct ist raw);
int http_str_to_htx(struct buffer *buf, struct ist raw, char **errmsg);
void release_http_reply(struct http_reply *http_reply);
int http_check_http_reply(struct http_reply *reply, struct proxy*px, char **errmsg);

78
src/http_htx.c
View File

@ -891,7 +891,7 @@ unsigned int http_get_htx_fhdr(const struct htx *htx, const struct ist hdr,
return 1;
}
int http_str_to_htx(struct buffer *buf, struct ist raw)
int http_str_to_htx(struct buffer *buf, struct ist raw, char **errmsg)
{
struct htx *htx;
struct htx_sl *sl;
@ -917,17 +917,24 @@ int http_str_to_htx(struct buffer *buf, struct ist raw)
h1m.flags |= H1_MF_NO_PHDR;
ret = h1_headers_to_hdr_list(raw.ptr, raw.ptr + raw.len,
hdrs, sizeof(hdrs)/sizeof(hdrs[0]), &h1m, &h1sl);
if (ret <= 0)
if (ret <= 0) {
memprintf(errmsg, "unabled to parse headers (error offset: %d)", h1m.err_pos);
goto error;
}
if (unlikely(h1sl.st.v.len != 8))
if (unlikely(h1sl.st.v.len != 8)) {
memprintf(errmsg, "invalid http version (%.*s)", (int)h1sl.st.v.len, h1sl.st.v.ptr);
goto error;
}
if ((*(h1sl.st.v.ptr + 5) > '1') ||
((*(h1sl.st.v.ptr + 5) == '1') && (*(h1sl.st.v.ptr + 7) >= '1')))
h1m.flags |= H1_MF_VER_11;
if (h1sl.st.status < 200 && (h1sl.st.status == 100 || h1sl.st.status >= 102))
if (h1sl.st.status < 200 && (h1sl.st.status == 100 || h1sl.st.status >= 102)) {
memprintf(errmsg, "invalid http status code for an error message (%u)",
h1sl.st.status);
goto error;
}
if (h1sl.st.status == 204 || h1sl.st.status == 304) {
/* Responses known to have no body. */
@ -944,8 +951,10 @@ int http_str_to_htx(struct buffer *buf, struct ist raw)
flags |= HTX_SL_F_XFER_ENC;
if (h1m.flags & H1_MF_XFER_LEN) {
flags |= HTX_SL_F_XFER_LEN;
if (h1m.flags & H1_MF_CHNK)
goto error; /* Unsupported because there is no body parsing */
if (h1m.flags & H1_MF_CHNK) {
memprintf(errmsg, "chunk-encoded payload not supported");
goto error;
}
else if (h1m.flags & H1_MF_CLEN) {
flags |= HTX_SL_F_CLEN;
if (h1m.body_len == 0)
@ -955,26 +964,37 @@ int http_str_to_htx(struct buffer *buf, struct ist raw)
flags |= HTX_SL_F_BODYLESS;
}
if ((flags & HTX_SL_F_BODYLESS) && raw.len > ret)
goto error; /* No body expected */
if ((flags & HTX_SL_F_CLEN) && h1m.body_len != (raw.len - ret))
goto error; /* body with wrong length */
if ((flags & HTX_SL_F_BODYLESS) && raw.len > ret) {
memprintf(errmsg, "message payload not expected");
goto error;
}
if ((flags & HTX_SL_F_CLEN) && h1m.body_len != (raw.len - ret)) {
memprintf(errmsg, "payload size does not match the announced content-length (%lu != %lu)",
(raw.len - ret), h1m.body_len);
goto error;
}
htx = htx_from_buf(buf);
sl = htx_add_stline(htx, HTX_BLK_RES_SL, flags, h1sl.st.v, h1sl.st.c, h1sl.st.r);
if (!sl || !htx_add_all_headers(htx, hdrs))
if (!sl || !htx_add_all_headers(htx, hdrs)) {
memprintf(errmsg, "unable to add headers into the HTX message");
goto error;
}
sl->info.res.status = h1sl.st.status;
while (raw.len > ret) {
int sent = htx_add_data(htx, ist2(raw.ptr + ret, raw.len - ret));
if (!sent)
if (!sent) {
memprintf(errmsg, "unable to add payload into the HTX message");
goto error;
}
ret += sent;
}
if (!htx_add_endof(htx, HTX_BLK_EOM))
if (!htx_add_endof(htx, HTX_BLK_EOM)) {
memprintf(errmsg, "unable to add EOM into the HTX message");
goto error;
}
return 1;
@ -1027,22 +1047,32 @@ static int http_htx_init(void)
{
struct buffer chk;
struct ist raw;
char *errmsg = NULL;
int rc;
int err_code = 0;
for (rc = 0; rc < HTTP_ERR_SIZE; rc++) {
if (!http_err_msgs[rc]) {
ha_alert("Internal error: no message defined for HTTP return code %d", rc);
ha_alert("Internal error: no default message defined for HTTP return code %d", rc);
err_code |= ERR_ALERT | ERR_FATAL;
continue;
}
raw = ist2(http_err_msgs[rc], strlen(http_err_msgs[rc]));
if (!http_str_to_htx(&chk, raw)) {
ha_alert("Internal error: Unable to convert message in HTX for HTTP return code %d.\n",
http_err_codes[rc]);
if (!http_str_to_htx(&chk, raw, &errmsg)) {
ha_alert("Internal error: invalid default message for HTTP return code %d: %s.\n",
http_err_codes[rc], errmsg);
err_code |= ERR_ALERT | ERR_FATAL;
}
else if (errmsg) {
ha_warning("invalid default message for HTTP return code %d: %s.\n", http_err_codes[rc], errmsg);
err_code |= ERR_WARN;
}
/* Reset errmsg */
free(errmsg);
errmsg = NULL;
http_err_chunks[rc] = chk;
http_err_replies[rc].type = HTTP_REPLY_ERRMSG;
http_err_replies[rc].status = http_err_codes[rc];
@ -1155,8 +1185,8 @@ struct buffer *http_load_errorfile(const char *file, char **errmsg)
}
/* Convert the error file into an HTX message */
if (!http_str_to_htx(&chk, ist2(err, errlen))) {
memprintf(errmsg, "unable to convert custom error message file '%s' in HTX.", file);
if (!http_str_to_htx(&chk, ist2(err, errlen), errmsg)) {
memprintf(errmsg, "'%s': %s", file, *errmsg);
free(http_errmsg->node.key);
free(http_errmsg);
goto out;
@ -1206,8 +1236,8 @@ struct buffer *http_load_errormsg(const char *key, const struct ist msg, char **
}
/* Convert the error file into an HTX message */
if (!http_str_to_htx(&chk, msg)) {
memprintf(errmsg, "unable to convert message in HTX.");
if (!http_str_to_htx(&chk, msg, errmsg)) {
memprintf(errmsg, "invalid error message: %s", *errmsg);
free(http_errmsg->node.key);
free(http_errmsg);
goto out;
@ -1757,6 +1787,9 @@ static int proxy_parse_errorloc(char **args, int section, struct proxy *curpx,
conf_err->line = line;
LIST_ADDQ(&curpx->conf.errors, &conf_err->list);
/* handle warning message */
if (*errmsg)
ret = 1;
out:
return ret;
@ -1819,6 +1852,9 @@ static int proxy_parse_errorfile(char **args, int section, struct proxy *curpx,
conf_err->line = line;
LIST_ADDQ(&curpx->conf.errors, &conf_err->list);
/* handle warning message */
if (*errmsg)
ret = 1;
out:
return ret;