From fc5f4592fef89673c9987d33d218250b4eea4ae5 Mon Sep 17 00:00:00 2001
From: fumiama <s862105088@gmail.com>
Date: Tue, 16 Feb 2021 12:24:01 +0800
Subject: [PATCH] v1.0

---
 .vscode/settings.json |   5 ++
 LICENSE               |  42 ++++-----
 README.md             |   4 +-
 client                | Bin 0 -> 12656 bytes
 client.c              |  38 ++++++++
 server                | Bin 0 -> 24224 bytes
 server.c              | 200 ++++++++++++++++++++++++++++++++++++++++++
 7 files changed, 266 insertions(+), 23 deletions(-)
 create mode 100644 .vscode/settings.json
 create mode 100644 client
 create mode 100644 client.c
 create mode 100644 server
 create mode 100644 server.c

diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..9cd751f
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,5 @@
+{
+    "files.associations": {
+        "cstdio": "c"
+    }
+}
\ No newline at end of file
diff --git a/LICENSE b/LICENSE
index ff183c0..e854f82 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,21 +1,21 @@
-MIT License
-
-Copyright (c) 2021 源文雨
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+MIT License
+
+Copyright (c) 2021 源文雨
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
index b1ffea3..a70487c 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,2 @@
-# simple-dict-server
-database["key"]="value"
+# simple-dict-server
+database["key"]="value"
diff --git a/client b/client
new file mode 100644
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diff --git a/client.c b/client.c
new file mode 100644
index 0000000..03a1307
--- /dev/null
+++ b/client.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <netdb.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+int main(int argc,char *argv[]) {
+    int sockfd, numbytes;
+    char buf[BUFSIZ];
+    struct sockaddr_in their_addr;
+    puts("break!");
+    while((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1);
+    puts("Get sockfd");
+    their_addr.sin_family = AF_INET;
+    their_addr.sin_port = htons(8000);
+    their_addr.sin_addr.s_addr=inet_addr("127.0.0.1");
+    bzero(&(their_addr.sin_zero), 8);
+    
+    while(connect(sockfd,(struct sockaddr*)&their_addr,sizeof(struct sockaddr)) == -1);
+    puts("Connected to server");
+    numbytes = recv(sockfd, buf, BUFSIZ,0);
+    buf[numbytes]='\0';  
+    puts(buf);
+    while(1) {
+        printf("Enter command:");
+        scanf("%s",buf);
+        numbytes = send(sockfd, buf, strlen(buf), 0);
+        numbytes = recv(sockfd,buf,BUFSIZ,0);
+        buf[numbytes]='\0';
+        puts(buf);
+    }
+    close(sockfd);
+    return 0;
+}
diff --git a/server b/server
new file mode 100644
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diff --git a/server.c b/server.c
new file mode 100644
index 0000000..f1d2450
--- /dev/null
+++ b/server.c
@@ -0,0 +1,200 @@
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int fd, accept_fd;
+ssize_t numbytes;
+socklen_t struct_len = sizeof(struct sockaddr_in);
+struct sockaddr_in server_addr;
+struct sockaddr_in client_addr;
+char buff[BUFSIZ];
+FILE *fp = NULL;
+
+struct DICTBLK{
+    char key[255];
+    u_char keysize;
+    char data[255];
+    u_char datasize;
+};
+typedef struct DICTBLK DICTBLK;
+#define DICTBLKSZ sizeof(DICTBLK)
+DICTBLK dict;
+
+#define showUsage(program) printf("Usage: %s listen_port try_times dict_file\n", program)
+
+int bindServer(uint16_t port, u_int try_times) {
+    int fail_count = 0;
+    int result = -1;
+    server_addr.sin_family = AF_INET;
+    server_addr.sin_port = htons(port);
+    server_addr.sin_addr.s_addr = INADDR_ANY;
+    bzero(&(server_addr.sin_zero), 8);
+
+    fd = socket(AF_INET, SOCK_STREAM, 0);
+    while(!~(result = bind(fd, (struct sockaddr *)&server_addr, struct_len)) && fail_count++ < try_times) sleep(1);
+    if(!~result && fail_count >= try_times) {
+        perror("Bind server failure!");
+        return 0;
+    } else{
+        puts("Bind server success!");
+        return 1;
+    }
+}
+
+int listenSocket(u_int try_times) {
+    int fail_count = 0;
+    int result = -1;
+    while(!~(result = listen(fd, 10)) && fail_count++ < try_times) sleep(1);
+    if(!~result && fail_count >= try_times) {
+        perror("Listen failed!");
+        return 0;
+    } else{
+        puts("Listening....");
+        return 1;
+    }
+}
+
+int sendData(char *data, size_t length) {
+    if(send(accept_fd, data, length, 0) < 0) {
+        perror("Send data error");
+        return 0;
+    } else {
+        printf("Send data: ");
+        while(length--) putchar(*data++);
+        putchar('\n');
+        return 1;
+    }
+}
+
+int s0_init(int *s) {
+    if(!strcmp("get", buff)) *s = 1;
+    else if(!strcmp("set", buff)) *s = 2;
+    else if(!strcmp("del", buff)) *s = 4;
+    else if(!strcmp("quit", buff)) return 0;
+    return sendData(buff, numbytes);
+}
+
+int s1_get(int *s) {
+    rewind(fp);
+    while(fread(&dict, DICTBLKSZ, 1, fp) > 0) {
+        u_char ks = dict.keysize;
+        dict.key[ks] = 0;
+        printf("[%s] Look key: (%d)%s\n", buff, ks, dict.key);
+        if(!strcmp(buff, dict.key)) {
+            *s = 0;
+            return sendData(dict.data, dict.datasize);
+        }
+    }
+    *s = 0;
+    return sendData("null", 4);
+}
+
+#define copyKey() {\
+    dict.keysize = (numbytes >= 255)?255:numbytes;\
+    strncpy(dict.key, buff, 255);\
+}
+
+int s2_set(int *s) {
+    rewind(fp);
+    *s = 3;
+    while(fread(&dict, DICTBLKSZ, 1, fp) > 0) {
+        u_char ks = dict.keysize;
+        dict.key[ks] = 0;
+        printf("[%ld] Key size: %d\n", numbytes, ks);
+        if(!dict.keysize || !strcmp(buff, dict.key)) {
+            copyKey();
+            fseek(fp, -DICTBLKSZ, SEEK_CUR);
+            return sendData("data", 4);
+        }
+    }
+    copyKey();
+    fseek(fp, 0, SEEK_END);
+    return sendData("data", 4);
+}
+
+int s3_setData(int *s) {
+    dict.datasize = (numbytes >= 255)?255:numbytes;
+    memcpy(dict.data, buff, dict.datasize);
+    *s = 0;
+    if(fwrite(&dict, DICTBLKSZ, 1, fp) != 1) {
+        fprintf(stderr, "Error set data: dict[%s]=%s\n", dict.key, buff);
+        return sendData("erro", 4);
+    } else {
+        printf("Set data: dict[%s]=%s\n", dict.key, buff);
+        fflush(fp);
+        return sendData("succ", 4);
+    }
+}
+
+int s4_del(int *s) {
+    rewind(fp);
+    *s = 0;
+    while(fread(&dict, DICTBLKSZ, 1, fp) > 0) {
+        dict.key[dict.keysize] = 0;
+        if(!strcmp(buff, dict.key)) {
+            fseek(fp, -DICTBLKSZ+255, SEEK_CUR);
+            fputc(0, fp);
+            return sendData("succ", 4);
+        }
+    }
+    return sendData("null", 4);
+}
+
+int checkBuffer() {
+    static int s = 0;
+    printf("Status: %d\n", s);
+    switch(s) {
+        case 0: return s0_init(&s); break;
+        case 1: return s1_get(&s); break;
+        case 2: return s2_set(&s); break;
+        case 3: return s3_setData(&s); break;
+        case 4: return s4_del(&s); break;
+        default: return -1; break;
+    }
+}
+
+void acceptClient() {
+    puts("Ready for accept, waitting...");
+    accept_fd = accept(fd, (struct sockaddr *)&client_addr, &struct_len);
+    if(accept_fd > 0) {
+        puts("Connected to the client.");
+        sendData("Welcome to simple dict server.", 31);
+        while((numbytes = recv(accept_fd, buff, BUFSIZ, 0)) > 0) {
+            buff[numbytes] = 0;
+            printf("Get %ld bytes: %s\n", numbytes, buff);
+            puts("Check buffer");
+            if(!checkBuffer()) break;
+        }
+        fprintf(stderr, "Recv %ld bytes\n", numbytes);
+        close(accept_fd);
+    } else perror("Error accepting client");
+}
+
+int main(int argc, char *argv[]) {
+    if(argc != 4) showUsage(argv[0]);
+    else {
+        int port = 0;
+        sscanf(argv[1], "%d", &port);
+        if(port > 0 && port < 65536) {
+            int times = 0;
+            sscanf(argv[2], "%d", &times);
+            if(times > 0) {
+                fp = NULL;
+                fp = fopen(argv[3], "rb+");
+                if(!fp) fp = fopen(argv[3], "wb+");
+                if(fp) {
+                    if(bindServer(port, times)) if(listenSocket(times)) while(1) acceptClient();
+                } else fprintf(stderr, "Error opening dict file: %s\n", argv[3]);
+            } else fprintf(stderr, "Error times: %d\n", times);
+        } else fprintf(stderr, "Error port: %d\n", port);
+    }
+    close(fd);
+    exit(EXIT_FAILURE);
+}