| 1,0 → 0,0 |
|---|
| link ../../confidential/jobs/0077_csv_lookup_server/v2/oid_lookup_srv.cpp |
| // ************************************************** |
| // ** OID CSV Lookup Server 1.1 ** |
| // ** (c) 2016-2019 ViaThinkSoft, Daniel Marschall ** |
| // ************************************************** |
| |
| // todo: log verbosity + datetime |
| // todo: publish at codelib |
| // todo: server hat sich einfach so beendet... "read: connection reset by peer" |
| // todo: 2019-02-24 service was booted together with the system, and i got "0 OIDs loaded". why??? |
| // todo: create vnag monitor that checks if this service is OK |
| |
| #include "oid_lookup_srv.h" |
| |
| unordered_set<string> lines; |
| |
| int loadfile(const string &filename) { |
| int cnt = 0; |
| |
| ifstream infile(filename); |
| string line; |
| while (getline(infile, line)) { |
| lines.insert(line); |
| ++cnt; |
| } |
| infile.close(); |
| |
| fprintf(stdout, "Loaded %d OIDs from %s\n", cnt, filename.c_str()); |
| |
| return cnt; |
| } |
| |
| bool stringAvailable(const string &str) { |
| return lines.find(str) != lines.end(); |
| } |
| |
| // Template of this code: http://www.gnu.org/software/libc/manual/html_node/Server-Example.html |
| // http://www.gnu.org/software/libc/manual/html_node/Inet-Example.html#Inet-Example |
| |
| struct con_descriptor { |
| time_t last_activity; |
| struct sockaddr_in clientname; |
| int queries; |
| time_t connect_ts; |
| }; |
| |
| con_descriptor cons[FD_SETSIZE]; |
| |
| int read_from_client(int filedes) { |
| char buffer[MAXMSG]; |
| int nbytes; |
| |
| nbytes = read(filedes, buffer, MAXMSG); |
| if (nbytes < 0) { |
| /* Read error. */ |
| //perror("read"); |
| //exit(EXIT_FAILURE); |
| return -1; |
| } else if (nbytes == 0) { |
| /* End-of-file. */ |
| return -1; |
| } else { |
| /* Data read. */ |
| |
| for (int i=0; i<MAXMSG; ++i) { |
| if ((buffer[i] == 13) || (buffer[i] == 10)) buffer[i] = 0; |
| } |
| |
| if (strcmp(buffer, "bye") == 0) { |
| fprintf(stdout, "%s:%d[%d] Client said good bye.\n", inet_ntoa(cons[filedes].clientname.sin_addr), ntohs(cons[filedes].clientname.sin_port), filedes); |
| return -1; |
| } else { |
| cons[filedes].queries++; |
| |
| // fprintf(stdout, "%s:%d[%d] Query #%d: %s\n", inet_ntoa(cons[filedes].clientname.sin_addr), ntohs(cons[filedes].clientname.sin_port), filedes, cons[filedes].queries, buffer); |
| |
| if (stringAvailable(buffer)) { |
| write(filedes, "1\n", 2); |
| } else { |
| write(filedes, "0\n", 2); |
| } |
| return 0; |
| } |
| } |
| } |
| |
| int fd_set_isset_count(const fd_set &my_fd_set) { |
| int cnt = 0; |
| for (int fd = 0; fd < FD_SETSIZE; ++fd) { |
| if (FD_ISSET(fd, &my_fd_set)) { |
| ++cnt; |
| } |
| } |
| return cnt; |
| } |
| |
| int loadCSVs() { |
| return loadfile("oid_table.csv"); |
| } |
| |
| void initConsArray() { |
| for (int i=0; i<FD_SETSIZE; ++i) { |
| cons[i].last_activity = 0; |
| memset(&cons[i].clientname, 0, sizeof(sockaddr_in)); |
| cons[i].queries = 0; |
| } |
| } |
| |
| int make_socket(uint16_t port) { |
| int sock; |
| struct sockaddr_in name; |
| |
| /* Create the socket. */ |
| sock = socket(PF_INET, SOCK_STREAM, 0); |
| if (sock < 0) { |
| perror("socket"); |
| exit(EXIT_FAILURE); |
| } |
| |
| int enable = 1; |
| if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int)) < 0) { |
| fprintf(stderr, "ERROR: setsockopt(SO_REUSEADDR) failed"); |
| exit(EXIT_FAILURE); |
| } |
| |
| /* Give the socket a name. */ |
| name.sin_family = AF_INET; |
| name.sin_port = htons (port); |
| name.sin_addr.s_addr = htonl (INADDR_ANY); |
| if (bind (sock, (struct sockaddr *) &name, sizeof(name)) < 0) { |
| perror("bind"); |
| exit(EXIT_FAILURE); |
| } |
| |
| return sock; |
| } |
| |
| int main(void) { |
| // extern int make_socket(uint16_t port); |
| int sock; |
| fd_set active_fd_set, read_fd_set; |
| |
| fprintf(stdout, "OID CSV Lookup Server 1.0 (c)2016-2019 ViaThinkSoft\n"); |
| fprintf(stdout, "Listening at port: %d\n", PORT); |
| fprintf(stdout, "Max connections: %d\n", FD_SETSIZE); |
| |
| initConsArray(); |
| |
| int loadedOIDs = loadCSVs(); |
| time_t csvLoad = time(NULL); |
| |
| /* Create the socket and set it up to accept connections. */ |
| sock = make_socket(PORT); |
| if (listen(sock, 1) < 0) { |
| perror("listen"); |
| exit(EXIT_FAILURE); |
| } |
| |
| /* Initialize the set of active sockets. */ |
| FD_ZERO(&active_fd_set); |
| FD_SET(sock, &active_fd_set); |
| |
| while (1) { |
| /* Block until input arrives on one or more active sockets. */ |
| read_fd_set = active_fd_set; |
| |
| struct timeval tv; |
| tv.tv_sec = 1; |
| tv.tv_usec = 0; // Not init'ing this can cause strange errors |
| |
| int retval = select(FD_SETSIZE, &read_fd_set, NULL, NULL, &tv); |
| |
| if (retval < 0) { |
| perror("select"); |
| exit(EXIT_FAILURE); |
| } else if (retval == 0) { |
| // fprintf(stdout, "Nothing received\n"); |
| } else { |
| /* Service all the sockets with input pending. */ |
| for (int i=0; i < FD_SETSIZE; ++i) { |
| if (FD_ISSET (i, &read_fd_set)) { |
| if (i == sock) { |
| /* Connection request on original socket. */ |
| int new_fd; |
| struct sockaddr_in clientname; |
| socklen_t size = sizeof(clientname); |
| new_fd = accept(sock, (struct sockaddr *) &clientname, &size); |
| if (new_fd < 0) { |
| perror("accept"); |
| exit(EXIT_FAILURE); |
| } |
| FD_SET(new_fd, &active_fd_set); |
| |
| cons[new_fd].clientname = clientname; |
| cons[new_fd].connect_ts = time(NULL); |
| |
| if (loadedOIDs == 0) { |
| loadedOIDs = loadCSVs(); |
| if (loadedOIDs == 0) { |
| fprintf(stderr, "%s:%d[%d] Service temporarily unavailable (OID list empty)\n", inet_ntoa(clientname.sin_addr), ntohs(clientname.sin_port), new_fd); |
| close(new_fd); |
| FD_CLR(new_fd, &active_fd_set); |
| } |
| } |
| |
| if (fd_set_isset_count(active_fd_set)-1 > MAX_CONNECTIONS) { // -1 is because we need to exclude the listening socket (i=sock) which is not a connected client |
| fprintf(stderr, "%s:%d[%d] Rejected because too many connections are open\n", inet_ntoa(clientname.sin_addr), ntohs(clientname.sin_port), new_fd); |
| close(new_fd); |
| FD_CLR(new_fd, &active_fd_set); |
| } else { |
| fprintf(stdout, "%s:%d[%d] Connected\n", inet_ntoa(clientname.sin_addr), ntohs(clientname.sin_port), new_fd); |
| } |
| |
| cons[new_fd].last_activity = time(NULL); |
| cons[new_fd].queries = 0; |
| } else { |
| /* Data arriving on an already-connected socket. */ |
| cons[i].last_activity = time(NULL); |
| if (read_from_client(i) < 0) { |
| fprintf(stdout, "%s:%d[%d] Connection closed after %d queries in %lu seconds.\n", inet_ntoa(cons[i].clientname.sin_addr), ntohs(cons[i].clientname.sin_port), i, cons[i].queries, time(NULL)-cons[i].connect_ts); |
| close(i); |
| FD_CLR(i, &active_fd_set); |
| } |
| } |
| } |
| } |
| } |
| |
| /* Check if we need to reload the CSV */ |
| if (time(NULL)-csvLoad >= CSVRELOADINTERVAL) { |
| loadCSVs(); |
| csvLoad = time(NULL); |
| } |
| |
| /* Check if we can close connections due to timeout */ |
| for (int i=0; i < FD_SETSIZE; ++i) { |
| if (FD_ISSET(i, &active_fd_set)) { |
| if (i == sock) continue; |
| if (time(NULL)-cons[i].last_activity >= CONNECTION_TIMEOUT) { |
| fprintf(stdout, "%s:%d[%d] Connection timeout.\n", inet_ntoa(cons[i].clientname.sin_addr), ntohs(cons[i].clientname.sin_port), i); |
| fprintf(stdout, "%s:%d[%d] Connection closed after %d queries in %lu seconds.\n", inet_ntoa(cons[i].clientname.sin_addr), ntohs(cons[i].clientname.sin_port), i, cons[i].queries, time(NULL)-cons[i].connect_ts); |
| close(i); |
| FD_CLR(i, &active_fd_set); |
| } |
| } |
| } |
| } |
| } |
| Property changes: |
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| Added: svn:mime-type |
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| +text/x-c++src |
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| \ No newline at end of property |
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| Deleted: svn:special |
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| -* |
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| \ No newline at end of property |
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