[48de515] | 1 | /* |
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| 2 | * Copyright (C) 2020 Soleta Networks <info@soleta.eu> |
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| 3 | * |
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| 4 | * This program is free software: you can redistribute it and/or modify it under |
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| 5 | * the terms of the GNU Affero General Public License as published by the |
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| 6 | * Free Software Foundation, version 3. |
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| 7 | */ |
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| 8 | |
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| 9 | #include "ogAdmServer.h" |
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| 10 | #include "dbi.h" |
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| 11 | #include "utils.h" |
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| 12 | #include "list.h" |
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| 13 | #include "rest.h" |
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| 14 | #include "client.h" |
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| 15 | #include "json.h" |
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| 16 | #include "schedule.h" |
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| 17 | #include <syslog.h> |
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| 18 | #include <sys/ioctl.h> |
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| 19 | #include <ifaddrs.h> |
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| 20 | #include <sys/types.h> |
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| 21 | #include <sys/stat.h> |
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[3b1f2c2] | 22 | #include <netinet/tcp.h> |
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[48de515] | 23 | #include <fcntl.h> |
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| 24 | #include <jansson.h> |
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| 25 | #include <time.h> |
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| 26 | |
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| 27 | static void og_client_release(struct ev_loop *loop, struct og_client *cli) |
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| 28 | { |
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| 29 | list_del(&cli->list); |
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| 30 | ev_io_stop(loop, &cli->io); |
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| 31 | close(cli->io.fd); |
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| 32 | free(cli); |
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| 33 | } |
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| 34 | |
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| 35 | static void og_client_reset_state(struct og_client *cli) |
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| 36 | { |
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| 37 | cli->state = OG_CLIENT_RECEIVING_HEADER; |
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| 38 | cli->buf_len = 0; |
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| 39 | } |
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| 40 | |
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| 41 | static int og_client_payload_too_large(struct og_client *cli) |
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| 42 | { |
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| 43 | char buf[] = "HTTP/1.1 413 Payload Too Large\r\n" |
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| 44 | "Content-Length: 0\r\n\r\n"; |
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| 45 | |
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| 46 | send(og_client_socket(cli), buf, strlen(buf), 0); |
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| 47 | |
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| 48 | return -1; |
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| 49 | } |
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| 50 | |
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| 51 | static int og_client_state_recv_hdr_rest(struct og_client *cli) |
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| 52 | { |
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| 53 | char *ptr; |
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| 54 | |
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| 55 | ptr = strstr(cli->buf, "\r\n\r\n"); |
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| 56 | if (!ptr) |
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| 57 | return 0; |
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| 58 | |
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| 59 | cli->msg_len = ptr - cli->buf + 4; |
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| 60 | |
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| 61 | ptr = strstr(cli->buf, "Content-Length: "); |
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| 62 | if (ptr) { |
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| 63 | sscanf(ptr, "Content-Length: %i[^\r\n]", &cli->content_length); |
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| 64 | if (cli->content_length < 0) |
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| 65 | return -1; |
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| 66 | cli->msg_len += cli->content_length; |
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| 67 | } |
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| 68 | |
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| 69 | ptr = strstr(cli->buf, "Authorization: "); |
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| 70 | if (ptr) |
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| 71 | sscanf(ptr, "Authorization: %63[^\r\n]", cli->auth_token); |
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| 72 | |
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| 73 | return 1; |
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| 74 | } |
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| 75 | |
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| 76 | static int og_client_recv(struct og_client *cli, int events) |
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| 77 | { |
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| 78 | struct ev_io *io = &cli->io; |
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| 79 | int ret; |
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| 80 | |
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| 81 | if (events & EV_ERROR) { |
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| 82 | syslog(LOG_ERR, "unexpected error event from client %s:%hu\n", |
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| 83 | inet_ntoa(cli->addr.sin_addr), |
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| 84 | ntohs(cli->addr.sin_port)); |
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| 85 | return 0; |
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| 86 | } |
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| 87 | |
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| 88 | ret = recv(io->fd, cli->buf + cli->buf_len, |
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| 89 | sizeof(cli->buf) - cli->buf_len, 0); |
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| 90 | if (ret <= 0) { |
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| 91 | if (ret < 0) { |
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| 92 | syslog(LOG_ERR, "error reading from client %s:%hu (%s)\n", |
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| 93 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port), |
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| 94 | strerror(errno)); |
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| 95 | } |
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| 96 | return ret; |
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| 97 | } |
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| 98 | |
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| 99 | return ret; |
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| 100 | } |
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| 101 | |
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| 102 | static void og_client_read_cb(struct ev_loop *loop, struct ev_io *io, int events) |
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| 103 | { |
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| 104 | struct og_client *cli; |
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| 105 | int ret; |
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| 106 | |
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| 107 | cli = container_of(io, struct og_client, io); |
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| 108 | |
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| 109 | ret = og_client_recv(cli, events); |
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| 110 | if (ret <= 0) |
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| 111 | goto close; |
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| 112 | |
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| 113 | if (cli->keepalive_idx >= 0) |
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| 114 | return; |
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| 115 | |
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| 116 | ev_timer_again(loop, &cli->timer); |
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| 117 | |
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| 118 | cli->buf_len += ret; |
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| 119 | if (cli->buf_len >= sizeof(cli->buf)) { |
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| 120 | syslog(LOG_ERR, "client request from %s:%hu is too long\n", |
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| 121 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port)); |
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| 122 | og_client_payload_too_large(cli); |
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| 123 | goto close; |
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| 124 | } |
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| 125 | |
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| 126 | switch (cli->state) { |
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| 127 | case OG_CLIENT_RECEIVING_HEADER: |
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| 128 | ret = og_client_state_recv_hdr_rest(cli); |
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| 129 | if (ret < 0) |
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| 130 | goto close; |
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| 131 | if (!ret) |
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| 132 | return; |
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| 133 | |
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| 134 | cli->state = OG_CLIENT_RECEIVING_PAYLOAD; |
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| 135 | /* Fall through. */ |
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| 136 | case OG_CLIENT_RECEIVING_PAYLOAD: |
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| 137 | /* Still not enough data to process request. */ |
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| 138 | if (cli->buf_len < cli->msg_len) |
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| 139 | return; |
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| 140 | |
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| 141 | cli->state = OG_CLIENT_PROCESSING_REQUEST; |
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| 142 | /* fall through. */ |
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| 143 | case OG_CLIENT_PROCESSING_REQUEST: |
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| 144 | ret = og_client_state_process_payload_rest(cli); |
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| 145 | if (ret < 0) { |
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| 146 | syslog(LOG_ERR, "Failed to process HTTP request from %s:%hu\n", |
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| 147 | inet_ntoa(cli->addr.sin_addr), |
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| 148 | ntohs(cli->addr.sin_port)); |
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| 149 | } |
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| 150 | if (ret < 0) |
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| 151 | goto close; |
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| 152 | |
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| 153 | if (cli->keepalive_idx < 0) { |
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| 154 | goto close; |
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| 155 | } else { |
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| 156 | og_client_reset_state(cli); |
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| 157 | } |
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| 158 | break; |
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| 159 | default: |
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| 160 | syslog(LOG_ERR, "unknown state, critical internal error\n"); |
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| 161 | goto close; |
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| 162 | } |
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| 163 | return; |
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| 164 | close: |
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| 165 | ev_timer_stop(loop, &cli->timer); |
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| 166 | og_client_release(loop, cli); |
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| 167 | } |
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| 168 | |
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| 169 | enum og_agent_state { |
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| 170 | OG_AGENT_RECEIVING_HEADER = 0, |
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| 171 | OG_AGENT_RECEIVING_PAYLOAD, |
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| 172 | OG_AGENT_PROCESSING_RESPONSE, |
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| 173 | }; |
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| 174 | |
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| 175 | static int og_agent_state_recv_hdr_rest(struct og_client *cli) |
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| 176 | { |
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| 177 | char *ptr; |
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| 178 | |
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| 179 | ptr = strstr(cli->buf, "\r\n\r\n"); |
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| 180 | if (!ptr) |
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| 181 | return 0; |
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| 182 | |
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| 183 | cli->msg_len = ptr - cli->buf + 4; |
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| 184 | |
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| 185 | ptr = strstr(cli->buf, "Content-Length: "); |
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| 186 | if (ptr) { |
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| 187 | sscanf(ptr, "Content-Length: %i[^\r\n]", &cli->content_length); |
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| 188 | if (cli->content_length < 0) |
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| 189 | return -1; |
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| 190 | cli->msg_len += cli->content_length; |
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| 191 | } |
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| 192 | |
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| 193 | return 1; |
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| 194 | } |
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| 195 | |
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| 196 | static void og_agent_reset_state(struct og_client *cli) |
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| 197 | { |
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| 198 | cli->state = OG_AGENT_RECEIVING_HEADER; |
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| 199 | cli->buf_len = 0; |
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| 200 | cli->content_length = 0; |
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| 201 | memset(cli->buf, 0, sizeof(cli->buf)); |
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| 202 | } |
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| 203 | |
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| 204 | static void og_agent_deliver_pending_cmd(struct og_client *cli) |
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| 205 | { |
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| 206 | const struct og_cmd *cmd; |
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| 207 | |
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| 208 | cmd = og_cmd_find(inet_ntoa(cli->addr.sin_addr)); |
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| 209 | if (!cmd) |
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| 210 | return; |
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| 211 | |
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| 212 | og_send_request(cmd->method, cmd->type, &cmd->params, cmd->json); |
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| 213 | cli->last_cmd_id = cmd->id; |
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| 214 | |
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| 215 | og_cmd_free(cmd); |
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| 216 | } |
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| 217 | |
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| 218 | static void og_agent_read_cb(struct ev_loop *loop, struct ev_io *io, int events) |
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| 219 | { |
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| 220 | struct og_client *cli; |
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| 221 | int ret; |
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| 222 | |
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| 223 | cli = container_of(io, struct og_client, io); |
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| 224 | |
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| 225 | ret = og_client_recv(cli, events); |
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| 226 | if (ret <= 0) |
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| 227 | goto close; |
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| 228 | |
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| 229 | ev_timer_again(loop, &cli->timer); |
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| 230 | |
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| 231 | cli->buf_len += ret; |
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| 232 | if (cli->buf_len >= sizeof(cli->buf)) { |
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| 233 | syslog(LOG_ERR, "client request from %s:%hu is too long\n", |
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| 234 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port)); |
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| 235 | goto close; |
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| 236 | } |
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| 237 | |
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| 238 | switch (cli->state) { |
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| 239 | case OG_AGENT_RECEIVING_HEADER: |
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| 240 | ret = og_agent_state_recv_hdr_rest(cli); |
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| 241 | if (ret < 0) |
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| 242 | goto close; |
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| 243 | if (!ret) |
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| 244 | return; |
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| 245 | |
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| 246 | cli->state = OG_AGENT_RECEIVING_PAYLOAD; |
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| 247 | /* Fall through. */ |
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| 248 | case OG_AGENT_RECEIVING_PAYLOAD: |
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| 249 | /* Still not enough data to process request. */ |
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| 250 | if (cli->buf_len < cli->msg_len) |
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| 251 | return; |
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| 252 | |
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| 253 | cli->state = OG_AGENT_PROCESSING_RESPONSE; |
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| 254 | /* fall through. */ |
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| 255 | case OG_AGENT_PROCESSING_RESPONSE: |
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| 256 | ret = og_agent_state_process_response(cli); |
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| 257 | if (ret < 0) { |
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| 258 | syslog(LOG_ERR, "Failed to process HTTP request from %s:%hu\n", |
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| 259 | inet_ntoa(cli->addr.sin_addr), |
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| 260 | ntohs(cli->addr.sin_port)); |
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| 261 | goto close; |
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| 262 | } else if (ret == 0) { |
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| 263 | og_agent_deliver_pending_cmd(cli); |
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| 264 | } |
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| 265 | |
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| 266 | og_agent_reset_state(cli); |
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| 267 | break; |
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| 268 | default: |
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| 269 | syslog(LOG_ERR, "unknown state, critical internal error\n"); |
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| 270 | goto close; |
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| 271 | } |
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| 272 | return; |
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| 273 | close: |
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| 274 | ev_timer_stop(loop, &cli->timer); |
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| 275 | og_client_release(loop, cli); |
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| 276 | } |
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| 277 | |
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| 278 | static void og_client_timer_cb(struct ev_loop *loop, ev_timer *timer, int events) |
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| 279 | { |
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| 280 | struct og_client *cli; |
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| 281 | |
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| 282 | cli = container_of(timer, struct og_client, timer); |
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| 283 | if (cli->keepalive_idx >= 0) { |
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| 284 | ev_timer_again(loop, &cli->timer); |
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| 285 | return; |
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| 286 | } |
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| 287 | syslog(LOG_ERR, "timeout request for client %s:%hu\n", |
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| 288 | inet_ntoa(cli->addr.sin_addr), ntohs(cli->addr.sin_port)); |
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| 289 | |
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| 290 | og_client_release(loop, cli); |
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| 291 | } |
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| 292 | |
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| 293 | static void og_agent_send_refresh(struct og_client *cli) |
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| 294 | { |
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| 295 | struct og_msg_params params; |
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| 296 | int err; |
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| 297 | |
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| 298 | params.ips_array[0] = inet_ntoa(cli->addr.sin_addr); |
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| 299 | params.ips_array_len = 1; |
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| 300 | |
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| 301 | err = og_send_request(OG_METHOD_GET, OG_CMD_REFRESH, ¶ms, NULL); |
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| 302 | if (err < 0) { |
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| 303 | syslog(LOG_ERR, "Can't send refresh to: %s\n", |
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| 304 | params.ips_array[0]); |
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| 305 | } else { |
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| 306 | syslog(LOG_INFO, "Sent refresh to: %s\n", |
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| 307 | params.ips_array[0]); |
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| 308 | } |
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| 309 | } |
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| 310 | |
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| 311 | /* Shut down connection if there is no complete message after 10 seconds. */ |
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| 312 | #define OG_CLIENT_TIMEOUT 10 |
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| 313 | |
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| 314 | /* Agent client operation might take longer, shut down after 30 seconds. */ |
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| 315 | #define OG_AGENT_CLIENT_TIMEOUT 30 |
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| 316 | |
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[3b1f2c2] | 317 | #define OG_TCP_KEEPALIVE_IDLE 60 |
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| 318 | #define OG_TCP_KEEPALIVE_INTL 30 |
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| 319 | #define OG_TCP_KEEPALIVE_CNT 4 |
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| 320 | |
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[48de515] | 321 | int socket_rest, socket_agent_rest; |
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| 322 | |
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| 323 | void og_server_accept_cb(struct ev_loop *loop, struct ev_io *io, int events) |
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| 324 | { |
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[3b1f2c2] | 325 | int intl = OG_TCP_KEEPALIVE_INTL, cnt = OG_TCP_KEEPALIVE_CNT; |
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| 326 | int on = 1, idle = OG_TCP_KEEPALIVE_IDLE; |
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[48de515] | 327 | struct sockaddr_in client_addr; |
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| 328 | socklen_t addrlen = sizeof(client_addr); |
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| 329 | struct og_client *cli; |
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| 330 | int client_sd; |
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| 331 | |
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| 332 | if (events & EV_ERROR) |
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| 333 | return; |
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| 334 | |
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| 335 | client_sd = accept(io->fd, (struct sockaddr *)&client_addr, &addrlen); |
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| 336 | if (client_sd < 0) { |
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| 337 | syslog(LOG_ERR, "cannot accept client connection\n"); |
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| 338 | return; |
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| 339 | } |
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| 340 | |
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[3b1f2c2] | 341 | setsockopt(client_sd, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(int)); |
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| 342 | setsockopt(client_sd, IPPROTO_TCP, TCP_KEEPIDLE, &idle, sizeof(int)); |
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| 343 | setsockopt(client_sd, IPPROTO_TCP, TCP_KEEPINTVL, &intl, sizeof(int)); |
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| 344 | setsockopt(client_sd, IPPROTO_TCP, TCP_KEEPCNT, &cnt, sizeof(int)); |
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| 345 | |
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[48de515] | 346 | cli = (struct og_client *)calloc(1, sizeof(struct og_client)); |
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| 347 | if (!cli) { |
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| 348 | close(client_sd); |
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| 349 | return; |
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| 350 | } |
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| 351 | memcpy(&cli->addr, &client_addr, sizeof(client_addr)); |
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| 352 | if (io->fd == socket_agent_rest) |
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| 353 | cli->keepalive_idx = 0; |
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| 354 | else |
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| 355 | cli->keepalive_idx = -1; |
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| 356 | |
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| 357 | if (io->fd == socket_rest) |
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| 358 | cli->rest = true; |
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| 359 | else if (io->fd == socket_agent_rest) |
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| 360 | cli->agent = true; |
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| 361 | |
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| 362 | if (io->fd == socket_agent_rest) |
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| 363 | ev_io_init(&cli->io, og_agent_read_cb, client_sd, EV_READ); |
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| 364 | else |
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| 365 | ev_io_init(&cli->io, og_client_read_cb, client_sd, EV_READ); |
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| 366 | |
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| 367 | ev_io_start(loop, &cli->io); |
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| 368 | if (io->fd == socket_agent_rest) { |
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| 369 | ev_timer_init(&cli->timer, og_client_timer_cb, |
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| 370 | OG_AGENT_CLIENT_TIMEOUT, 0.); |
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| 371 | } else { |
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| 372 | ev_timer_init(&cli->timer, og_client_timer_cb, |
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| 373 | OG_CLIENT_TIMEOUT, 0.); |
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| 374 | } |
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| 375 | ev_timer_start(loop, &cli->timer); |
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| 376 | og_client_add(cli); |
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| 377 | |
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| 378 | if (io->fd == socket_agent_rest) { |
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| 379 | og_agent_send_refresh(cli); |
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| 380 | } |
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| 381 | } |
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| 382 | |
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| 383 | int og_socket_server_init(const char *port) |
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| 384 | { |
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| 385 | struct sockaddr_in local; |
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| 386 | int sd, on = 1; |
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| 387 | |
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| 388 | sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
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| 389 | if (sd < 0) { |
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| 390 | syslog(LOG_ERR, "cannot create main socket\n"); |
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| 391 | return -1; |
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| 392 | } |
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| 393 | setsockopt(sd, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(int)); |
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| 394 | |
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| 395 | local.sin_addr.s_addr = htonl(INADDR_ANY); |
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| 396 | local.sin_family = AF_INET; |
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| 397 | local.sin_port = htons(atoi(port)); |
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| 398 | |
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| 399 | if (bind(sd, (struct sockaddr *) &local, sizeof(local)) < 0) { |
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| 400 | close(sd); |
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| 401 | syslog(LOG_ERR, "cannot bind socket\n"); |
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| 402 | return -1; |
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| 403 | } |
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| 404 | |
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| 405 | listen(sd, 250); |
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| 406 | |
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| 407 | return sd; |
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| 408 | } |
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