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[PATCH 02/23] C webapp

MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

From: arf20 <aruizfernandez05@xxxxxxxxx>

---
 Makefile       |  14 +++++++
 README.md      |   7 ++++
 index.htm.tmpl |   8 +++-
 main.c         |  98 +++++++++++++++++++++++++++++++++++++++++++++
 monitor        | Bin 0 -> 29912 bytes
 monitor.c      | 105 +++++++++++++++++++++++++++++++++++++++++++++++++
 monitor.cfg    |   6 +++
 monitor.h      |   8 ++++
 8 files changed, 245 insertions(+), 1 deletion(-)
 create mode 100644 Makefile
 create mode 100644 main.c
 create mode 100755 monitor
 create mode 100644 monitor.c
 create mode 100644 monitor.cfg
 create mode 100644 monitor.h

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..bc05321
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+CC = gcc
+CFLAGS = -g -Wall -pedantic
+LDFLAGS = -lmicrohttpd
+
+BIN = monitor
+SRC = main.c monitor.c
+
+$(BIN): $(SRC)
+	$(CC) -o $@ $(CFLAGS) $^ $(LDFLAGS)
+
+.PHONY: clean
+clean:
+	rm $(BIN)
+
diff --git a/README.md b/README.md
index 2f0b344..a373746 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,10 @@
 # arfnet2-status
 
 ARFNET Status Monitor
+
+## Features (TODO)
+
+ - Current service status table
+ - Outage events table
+ - Uptime counter (total, month)
+
diff --git a/index.htm.tmpl b/index.htm.tmpl
index a9022d8..462f744 100644
--- a/index.htm.tmpl
+++ b/index.htm.tmpl
@@ -4,6 +4,11 @@
         <meta charset="UTF-8">
         <link rel="stylesheet" type="text/css" href="https://arf20.com/style.css";>
         <title>ARFNET</title>
+        <style>
+table, th, td {
+  border: 1px solid #abb2bf;
+}
+        </style>
     </head>
 
     <body>
@@ -15,7 +20,8 @@
             <h2 class="center">Status Monitor</h2>
             <p>This webapp monitors the status of the main ARFNET services from outside the ARFNET network</p>
             <table>
-
+                <tr><th>Type</th><th>Service</th><th>Status</th></tr>
+                %s
             </table>
         </main>
     </body>
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..f01d928
--- /dev/null
+++ b/main.c
@@ -0,0 +1,98 @@
+#include <sys/types.h>
+#include <sys/select.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <microhttpd.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "monitor.h"
+
+#define PORT        8888
+#define RES_BUFF    65535
+
+static char *index_format_template = NULL;
+
+
+enum MHD_Result answer_to_connection(
+    void *cls, struct MHD_Connection *connection,
+    const char *url,
+    const char *method,
+    const char *version,
+    const char *upload_data,
+    size_t *upload_data_size,
+    void **ptr
+) {
+    char buff[RES_BUFF];
+
+    const struct sockaddr_in **coninfo =
+        (const struct sockaddr_in**)MHD_get_connection_info(
+            connection, MHD_CONNECTION_INFO_CLIENT_ADDRESS);
+
+    printf("%s - %s %s: ", inet_ntoa((*coninfo)->sin_addr), method, url);
+
+    struct MHD_Response *response;
+    int ret;
+
+    if (strcmp(method, "GET") == 0 && strcmp(url, "/") == 0) {
+        snprintf(buff, RES_BUFF,
+            index_format_template, monitor_generate_status_html());
+
+        response = MHD_create_response_from_buffer(strlen(buff), (void*)buff,
+            MHD_RESPMEM_PERSISTENT);
+
+        printf("%d\n", 200);
+        ret = MHD_queue_response(connection, MHD_HTTP_OK, response);
+        MHD_destroy_response(response);
+    }
+    else {
+        response = MHD_create_response_from_buffer(0, (void*)NULL, 0);
+        printf("%d\n", 418);
+        ret = MHD_queue_response(connection, 418, response);
+        MHD_destroy_response(response);
+    }
+    return ret;
+}
+
+int main() {
+    /* read index template file */
+    FILE *tf = fopen("index.htm.tmpl", "r");
+    if (!tf) {
+        fprintf(stderr, "error opening index template file: %s\n",
+            strerror(errno));
+        return 1;
+    }
+    fseek(tf, 0, SEEK_END);
+    size_t tfs = ftell(tf);
+    rewind(tf);
+    index_format_template = malloc(tfs);
+    fread(index_format_template, 1, tfs, tf);
+    fclose(tf);
+
+    /* start server */
+    struct MHD_Daemon *daemon;
+
+    daemon = MHD_start_daemon(
+        MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_EPOLL,
+        PORT, NULL, NULL,
+        &answer_to_connection, NULL, MHD_OPTION_END);
+
+    if (!daemon) {
+        fprintf(stderr, "error starting libmicrohttpd daemon: \n");
+        return 1;
+    }
+
+    monitor_init("monitor.cfg");
+
+    while (1) {
+        monitor_check();
+        sleep(5);
+    }
+}
+
diff --git a/monitor b/monitor
new file mode 100755
index 0000000000000000000000000000000000000000..3992ddc45410cd58d6f0d1cdfa37db5b3aa9d44b
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diff --git a/monitor.c b/monitor.c
new file mode 100644
index 0000000..c9903ce
--- /dev/null
+++ b/monitor.c
@@ -0,0 +1,105 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "monitor.h"
+
+typedef enum {
+    TYPE_REACH,
+    TYPE_DNS,
+    TYPE_WEB
+} type_t;
+
+const char *type_str[] = { "reach", "dns", "web" };
+
+typedef enum {
+    STATUS_DOWN,
+    STATUS_UP
+} status_t;
+
+typedef struct {
+    type_t type;
+    char *target;
+    status_t status;
+} target_t;
+
+static target_t targets[256];
+static size_t target_n = 0;
+
+int
+monitor_init(const char *cfg_file) {
+    FILE *cfgf = fopen(cfg_file, "r");
+    if (!cfgf) {
+        fprintf(stderr, "Error opening config: %s\n", strerror(errno));
+        return -1;
+    }
+
+    printf("monitor targets:\n");
+    
+    char line[256];
+    while (fgets(line, sizeof(line), cfgf)) {
+        if (*line == '#' || *line == '\n')
+            continue;
+
+        char *type = line;
+        char *target = strchr(line, '=');
+        if (!target) {
+            fprintf(stderr, "malformed config line: %s\n", line);
+            continue;
+        }
+
+
+        *target = '\0';
+        target++;
+
+        if (strcmp(type, "reach") == 0)
+            targets[target_n].type = TYPE_REACH;
+        else if (strcmp(type, "dns") == 0)
+            targets[target_n].type = TYPE_DNS;
+        else if (strcmp(type, "web") == 0)
+            targets[target_n].type = TYPE_WEB;
+
+        targets[target_n].target = strdup(target);
+        targets[target_n].status = STATUS_DOWN;
+
+        printf("\t%s: %s", type_str[targets[target_n].type],
+            targets[target_n].target);
+        
+        target_n++;
+    } 
+
+    fclose(cfgf);
+
+    return 0;
+}
+
+const char *
+monitor_generate_status_html()
+{
+    static char buff[65535];
+
+    static char *status_html[] = {
+        "down",
+        "up"
+    };
+   
+    char *pos = buff;
+
+    for (size_t i = 0; i < target_n; i++) {
+        pos += snprintf(pos, 65535,
+            "<tr><td>%s</td><td>%s</td><td>%s</td></tr>\n",
+            type_str[targets[i].type],
+            targets[i].target,
+            status_html[targets[i].status]);
+    }
+
+    return buff;  
+}
+
+void
+monitor_check()
+{
+
+}
+
diff --git a/monitor.cfg b/monitor.cfg
new file mode 100644
index 0000000..1e2f9dc
--- /dev/null
+++ b/monitor.cfg
@@ -0,0 +1,6 @@
+# Monitor config
+# type=target
+reach=2.59.235.35
+dns=arf20.com
+web=http://arf20.com
+
diff --git a/monitor.h b/monitor.h
new file mode 100644
index 0000000..f9d4458
--- /dev/null
+++ b/monitor.h
@@ -0,0 +1,8 @@
+#ifndef _MONITOR_H
+#define _MONITOR_H
+
+int monitor_init(const char *cfg_file);
+const char *monitor_generate_status_html();
+void monitor_check();
+
+#endif /* _MONITOR_H */
-- 
2.47.3
References:
[arfnet2-status PATCH 00/23] First releasearf20 <arf20@xxxxxxxxx>