src/server/plugins/postgresql/service.c

Wed, 07 Jun 2023 15:59:00 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Wed, 07 Jun 2023 15:59:00 +0200
changeset 500
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parent 278
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permissions
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fix uninitialized memory in http stream, when chunked transfer encoding is used

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2022 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include "service.h"
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30
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31 #include <stdio.h>
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32 #include <string.h>
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33
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34 #include "resource.h"
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35
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36 int pg_query(pblock *pb, Session *sn, Request *rq) {
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37 char *respool = pblock_findval("resource", pb);
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38 char *query = pblock_findval("query", pb);
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39
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40 if(!respool) {
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41 log_ereport(LOG_MISCONFIG, "pg-query: missing resource parameter");
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42 return REQ_ABORTED;
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43 }
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44 if(!query) {
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45 log_ereport(LOG_MISCONFIG, "pg-query: missing query parameter");
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46 return REQ_ABORTED;
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47 }
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48
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49 // Get the named resource and check if the PG connection works
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50 ResourceData *res = resourcepool_lookup(sn, rq, respool, 0);
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51 if(!res) {
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52 log_ereport(LOG_FAILURE, "pg-query: cannot get resource '%s'", respool);
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53 return REQ_ABORTED;
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54 }
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55
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56 PGconn *connection = res->data;
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57 if(pg_check_connection(LOG_FAILURE, respool, connection)) {
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58 return REQ_ABORTED;
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59 }
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60
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61 // execute query
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62 PGresult *result = PQexec(connection, query);
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63 if(!result) return REQ_ABORTED;
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64
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65 // start response
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66 pblock_remove("content-type", rq->srvhdrs);
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67 pblock_nvinsert("content-type", "text/html", rq->srvhdrs);
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68
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69 protocol_status(sn, rq, 200, NULL);
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70 http_start_response(sn, rq);
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71
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72 // (html) header
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73 net_printf(sn->csd, "%s", "<!DOCTYPE html>\n<html><head></head><body>\n");
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74
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75 int nfields = PQnfields(result);
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76 if(nfields > 0) {
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77 net_printf(sn->csd, "<table>\n<tr>\n");
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78 for(int i=0;i<nfields;i++) {
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79 char *fieldName = PQfname(result, i);
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80 char *fieldNameEscaped = util_html_escape(fieldName);
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81 if(fieldNameEscaped) {
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82 net_printf(sn->csd, "<th>%s</th>\n", fieldNameEscaped);
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83 FREE(fieldNameEscaped);
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84 }
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85 }
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86 net_printf(sn->csd, "</tr>\n");
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87
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88 int nrows = PQntuples(result);
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89 for(int r=0;r<nrows;r++) {
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90 net_printf(sn->csd, "<tr>\n");
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91 for(int c=0;c<nfields;c++) {
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92 char *fieldValue = PQgetvalue(result, r, c);
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93 char *fieldValueEscaped = util_html_escape(fieldValue);
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94 if(fieldValueEscaped) {
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95 net_printf(sn->csd, "<td>%s</td>\n", fieldValueEscaped);
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96 FREE(fieldValueEscaped);
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97 }
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98 }
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99 net_printf(sn->csd, "</tr>\n");
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100 }
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101
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102
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103 net_printf(sn->csd, "</table>\n");
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104 } else {
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105 net_printf(sn->csd, "<p>%s</p>\n", PQresStatus(PQresultStatus(result)));
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106 }
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107
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108 net_printf(sn->csd, "%s", "</body></html>\n");
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109
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110 PQclear(result);
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111
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112 return REQ_PROCEED;
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113 }

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