1 | #include <errno.h> |
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2 | #include <fcntl.h> |
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3 | #include <glob.h> |
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4 | #include <limits.h> |
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5 | #include <stdio.h> |
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6 | #include <stdlib.h> |
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7 | #include <unistd.h> |
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8 | |
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9 | #include <sys/socket.h> |
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10 | #include <sys/un.h> |
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11 | #include <sys/types.h> |
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12 | #include <sys/stat.h> |
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13 | |
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14 | #include "neercs.h" |
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15 | |
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16 | static char * build_socket_path(char *socket_dir) |
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17 | { |
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18 | char *path, *dir; |
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19 | path = (char *)malloc(PATH_MAX+1); |
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20 | dir = socket_dir; |
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21 | if(!dir) |
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22 | dir = getenv("NEERCSDIR"); |
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23 | if(!dir) |
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24 | dir = getenv("TMPDIR"); |
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25 | if(!dir) |
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26 | dir = "/tmp"; |
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27 | if(path) |
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28 | snprintf(path, PATH_MAX+1, "%s/neercs.%d.sock", dir, getpid()); |
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29 | return path; |
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30 | } |
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31 | |
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32 | int create_socket(struct screen_list* screen_list) |
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33 | { |
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34 | int sock; |
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35 | struct sockaddr_un myaddr; |
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36 | |
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37 | sock = socket(AF_UNIX, SOCK_DGRAM, 0); |
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38 | |
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39 | if(sock < 0) |
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40 | { |
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41 | perror("create_socket:socket"); |
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42 | return errno; |
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43 | } |
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44 | |
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45 | memset(&myaddr, 0, sizeof(struct sockaddr_un)); |
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46 | |
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47 | myaddr.sun_family = AF_UNIX; |
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48 | screen_list->socket_path = build_socket_path(screen_list->socket_path); |
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49 | strncpy(myaddr.sun_path, screen_list->socket_path, sizeof(myaddr.sun_path) - 1); |
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50 | unlink(myaddr.sun_path); |
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51 | |
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52 | if(bind(sock, (struct sockaddr *)&myaddr, sizeof(struct sockaddr_un)) < 0) |
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53 | { |
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54 | free(screen_list->socket_path); |
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55 | screen_list->socket_path = NULL; |
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56 | close(sock); |
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57 | perror("create_socket:bind"); |
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58 | return errno; |
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59 | } |
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60 | fcntl(sock, F_SETFL, O_NONBLOCK); |
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61 | |
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62 | debug("Listening on %s (%d)", screen_list->socket_path, sock); |
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63 | |
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64 | screen_list->socket = sock; |
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65 | |
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66 | return 0; |
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67 | } |
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68 | |
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69 | int detach(struct screen_list* screen_list, caca_display_t * dp) |
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70 | { |
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71 | int fd; |
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72 | int pid; |
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73 | |
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74 | screen_list->attached = 0; |
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75 | caca_free_display(dp); |
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76 | |
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77 | close(0); |
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78 | close(1); |
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79 | close(2); |
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80 | |
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81 | fd = open("/tmp/log.txt", O_RDWR|O_CREAT, S_IRUSR|S_IWUSR); |
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82 | dup2(fd, 0); |
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83 | dup2(fd, 1); |
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84 | dup2(fd, 2); |
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85 | if (fd > 2) |
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86 | close(fd); |
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87 | |
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88 | if(!screen_list->socket) |
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89 | { |
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90 | pid = fork(); |
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91 | if (pid < 0) |
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92 | return 1; |
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93 | if (pid > 0) |
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94 | exit(0); |
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95 | |
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96 | create_socket(screen_list); |
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97 | setsid(); |
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98 | } |
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99 | |
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100 | return 0; |
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101 | } |
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102 | |
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103 | /* FIXME Is this really not defined anywhere ? */ |
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104 | #define MIN(X,Y) ((X) < (Y) ? (X) : (Y)) |
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105 | |
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106 | static int handle_command(char * cmd, struct screen_list* screen_list, cucul_canvas_t * cv, caca_display_t ** dp) |
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107 | { |
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108 | int refresh = 0; |
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109 | debug("Received command %s", cmd); |
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110 | if(!strncmp("ENV ", cmd, MIN(4, strlen(cmd)))) |
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111 | { |
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112 | putenv(strdup(cmd+4)); |
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113 | } |
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114 | else if(!strncmp("ATTACH ", cmd, MIN(7, strlen(cmd)))) |
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115 | { |
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116 | int fd; |
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117 | screen_list->attached = 1; |
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118 | close(screen_list->socket); |
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119 | screen_list->socket= 0; |
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120 | unlink(screen_list->socket_path); |
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121 | screen_list->socket_path = NULL; |
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122 | close(0); |
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123 | fd=open(cmd+7, O_RDWR); |
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124 | dup2(fd, 0); |
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125 | close(1); |
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126 | fd=open(cmd+7, O_RDWR); |
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127 | dup2(fd, 1); |
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128 | close(2); |
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129 | fd=open(cmd+7, O_RDWR); |
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130 | dup2(fd, 2); |
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131 | *dp = caca_create_display(cv); |
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132 | if(*dp) |
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133 | { |
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134 | caca_set_cursor(*dp, 1); |
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135 | refresh = 1; |
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136 | } |
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137 | } |
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138 | else |
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139 | { |
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140 | fprintf(stderr, "Unknown command received: %s\n", cmd); |
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141 | } |
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142 | return refresh; |
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143 | } |
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144 | |
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145 | int read_socket(struct screen_list* screen_list, cucul_canvas_t * cv, caca_display_t ** dp) { |
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146 | ssize_t n; |
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147 | char buf[4097]; |
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148 | int refresh = 0; |
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149 | |
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150 | if(!screen_list->socket) |
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151 | return 0; |
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152 | |
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153 | while (screen_list->socket && (n = read(screen_list->socket, buf, sizeof(buf)-1)) > 0) |
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154 | { |
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155 | buf[n] = 0; |
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156 | refresh |= handle_command(buf, screen_list, cv, dp); |
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157 | } |
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158 | return refresh; |
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159 | } |
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160 | |
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161 | char ** list_sockets(char *socket_dir) |
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162 | { |
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163 | char *pattern, *dir; |
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164 | glob_t globbuf; |
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165 | |
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166 | globbuf.gl_pathv = NULL; |
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167 | |
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168 | pattern = (char *)malloc(PATH_MAX+1); |
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169 | |
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170 | dir = socket_dir; |
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171 | if(!dir) |
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172 | dir = getenv("NEERCSDIR"); |
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173 | if(!dir) |
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174 | dir = getenv("TMPDIR"); |
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175 | if(!dir) |
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176 | dir = "/tmp"; |
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177 | |
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178 | if(!pattern) |
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179 | return globbuf.gl_pathv; |
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180 | |
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181 | snprintf(pattern, PATH_MAX, "%s/neercs.*.sock", dir); |
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182 | pattern[PATH_MAX] = '\0'; |
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183 | |
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184 | debug("Looking for sockets in the form %s", pattern); |
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185 | |
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186 | glob(pattern, 0, NULL, &globbuf); |
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187 | |
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188 | return globbuf.gl_pathv; |
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189 | } |
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190 | |
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191 | |
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192 | /* FIXME Is this really not defined anywhere ? */ |
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193 | extern char **environ; |
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194 | |
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195 | int request_attach(char *socket_path) |
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196 | { |
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197 | int i; |
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198 | int sock; |
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199 | char fdstr[PATH_MAX], lnk[PATH_MAX]; |
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200 | char buf[4096]; |
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201 | struct sockaddr_un addr; |
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202 | |
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203 | debug("Connecting to %s", socket_path); |
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204 | |
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205 | /* Open the socket */ |
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206 | if ((sock = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) { |
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207 | perror("request_attach:socket"); |
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208 | return 1; |
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209 | } |
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210 | |
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211 | memset(&addr,0,sizeof(addr)); |
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212 | addr.sun_family = AF_UNIX; |
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213 | strcpy(addr.sun_path,socket_path); |
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214 | if (connect(sock, &addr, sizeof(addr)) < 0) |
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215 | { |
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216 | perror("request_attach:connect"); |
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217 | return 1; |
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218 | } |
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219 | |
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220 | debug("Sending environment", 0); |
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221 | |
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222 | /* Send our environment */ |
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223 | for(i=0; environ[i]; i++) |
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224 | { |
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225 | snprintf(buf, 4096, "ENV %s", environ[i]); |
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226 | write(sock, buf, strlen(buf)); |
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227 | } |
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228 | |
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229 | snprintf(fdstr, sizeof(fdstr), "/proc/%d/fd/0", getpid()); |
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230 | readlink(fdstr, lnk, sizeof(lnk)-1); |
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231 | lnk[PATH_MAX-1] = '\0'; |
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232 | |
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233 | close(0); |
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234 | |
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235 | debug("Requesting attach to %s", lnk); |
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236 | |
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237 | /* Request attaching */ |
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238 | snprintf(buf, 4096, "ATTACH %s", lnk); |
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239 | write(sock, buf, strlen(buf)); |
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240 | close(sock); |
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241 | |
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242 | debug("Exiting", 0); |
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243 | exit(0); |
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244 | } |
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