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1 | office | 1 | /** |
2 | * @file run.c |
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3 | * @author Ambroz Bizjak <ambrop7@gmail.com> |
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4 | * |
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5 | * @section LICENSE |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * 3. Neither the name of the author nor the |
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15 | * names of its contributors may be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | * |
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29 | * @section DESCRIPTION |
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30 | * |
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31 | * Module for running arbitrary programs. |
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32 | * NOTE: There is no locking - the program may run in parallel with other |
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33 | * NCD processes and their programs. |
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34 | * |
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35 | * Synopsis: run(list do_cmd, list undo_cmd) |
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36 | * Arguments: |
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37 | * list do_cmd - Command run on startup. The first element is the full path |
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38 | * to the executable, other elements are command line arguments (excluding |
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39 | * the zeroth argument). An empty list is interpreted as no operation. |
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40 | * list undo_cmd - Command run on shutdown, like do_cmd. |
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41 | */ |
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42 | |||
43 | #include <stdlib.h> |
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44 | #include <string.h> |
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45 | |||
46 | #include <misc/strdup.h> |
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47 | #include <ncd/extra/value_utils.h> |
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48 | #include <ncd/modules/command_template.h> |
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49 | |||
50 | #include <ncd/module_common.h> |
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51 | |||
52 | #include <generated/blog_channel_ncd_run.h> |
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53 | |||
54 | static void template_free_func (void *vo, int is_error); |
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55 | |||
56 | struct instance { |
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57 | NCDModuleInst *i; |
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58 | BEventLock lock; |
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59 | command_template_instance cti; |
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60 | }; |
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61 | |||
62 | static int build_cmdline (NCDModuleInst *i, NCDValRef args, int remove, char **exec, CmdLine *cl) |
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63 | { |
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64 | // read arguments |
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65 | NCDValRef do_cmd_arg; |
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66 | NCDValRef undo_cmd_arg; |
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67 | if (!NCDVal_ListRead(args, 2, &do_cmd_arg, &undo_cmd_arg)) { |
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68 | ModuleLog(i, BLOG_ERROR, "wrong arity"); |
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69 | goto fail0; |
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70 | } |
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71 | if (!NCDVal_IsList(do_cmd_arg) || !NCDVal_IsList(undo_cmd_arg)) { |
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72 | ModuleLog(i, BLOG_ERROR, "wrong type"); |
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73 | goto fail0; |
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74 | } |
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75 | |||
76 | NCDValRef list = (remove ? undo_cmd_arg : do_cmd_arg); |
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77 | size_t count = NCDVal_ListCount(list); |
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78 | |||
79 | // check if there is no command |
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80 | if (count == 0) { |
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81 | *exec = NULL; |
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82 | return 1; |
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83 | } |
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84 | |||
85 | // read exec |
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86 | NCDValRef exec_arg = NCDVal_ListGet(list, 0); |
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87 | if (!NCDVal_IsStringNoNulls(exec_arg)) { |
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88 | ModuleLog(i, BLOG_ERROR, "wrong type"); |
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89 | goto fail0; |
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90 | } |
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91 | if (!(*exec = ncd_strdup(exec_arg))) { |
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92 | ModuleLog(i, BLOG_ERROR, "ncd_strdup failed"); |
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93 | goto fail0; |
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94 | } |
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95 | |||
96 | // start cmdline |
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97 | if (!CmdLine_Init(cl)) { |
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98 | ModuleLog(i, BLOG_ERROR, "CmdLine_Init failed"); |
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99 | goto fail1; |
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100 | } |
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101 | |||
102 | // add header |
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103 | if (!CmdLine_Append(cl, *exec)) { |
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104 | ModuleLog(i, BLOG_ERROR, "CmdLine_Append failed"); |
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105 | goto fail2; |
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106 | } |
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107 | |||
108 | // add additional arguments |
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109 | for (size_t j = 1; j < count; j++) { |
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110 | NCDValRef arg = NCDVal_ListGet(list, j); |
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111 | |||
112 | if (!NCDVal_IsStringNoNulls(arg)) { |
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113 | ModuleLog(i, BLOG_ERROR, "wrong type"); |
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114 | goto fail2; |
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115 | } |
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116 | |||
117 | if (!CmdLine_AppendNoNullMr(cl, NCDVal_StringMemRef(arg))) { |
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118 | ModuleLog(i, BLOG_ERROR, "CmdLine_AppendNoNull failed"); |
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119 | goto fail2; |
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120 | } |
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121 | } |
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122 | |||
123 | // finish |
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124 | if (!CmdLine_Finish(cl)) { |
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125 | ModuleLog(i, BLOG_ERROR, "CmdLine_Finish failed"); |
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126 | goto fail2; |
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127 | } |
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128 | |||
129 | return 1; |
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130 | |||
131 | fail2: |
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132 | CmdLine_Free(cl); |
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133 | fail1: |
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134 | free(*exec); |
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135 | fail0: |
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136 | return 0; |
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137 | } |
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138 | |||
139 | static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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140 | { |
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141 | struct instance *o = vo; |
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142 | o->i = i; |
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143 | |||
144 | // init dummy event lock |
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145 | BEventLock_Init(&o->lock, BReactor_PendingGroup(i->params->iparams->reactor)); |
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146 | |||
147 | command_template_new(&o->cti, i, params, build_cmdline, template_free_func, o, BLOG_CURRENT_CHANNEL, &o->lock); |
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148 | return; |
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149 | } |
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150 | |||
151 | void template_free_func (void *vo, int is_error) |
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152 | { |
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153 | struct instance *o = vo; |
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154 | |||
155 | // free dummy event lock |
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156 | BEventLock_Free(&o->lock); |
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157 | |||
158 | if (is_error) { |
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159 | NCDModuleInst_Backend_DeadError(o->i); |
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160 | } else { |
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161 | NCDModuleInst_Backend_Dead(o->i); |
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162 | } |
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163 | } |
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164 | |||
165 | static void func_die (void *vo) |
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166 | { |
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167 | struct instance *o = vo; |
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168 | |||
169 | command_template_die(&o->cti); |
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170 | } |
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171 | |||
172 | static struct NCDModule modules[] = { |
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173 | { |
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174 | .type = "run", |
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175 | .func_new2 = func_new, |
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176 | .func_die = func_die, |
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177 | .alloc_size = sizeof(struct instance) |
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178 | }, { |
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179 | .type = NULL |
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180 | } |
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181 | }; |
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182 | |||
183 | const struct NCDModuleGroup ncdmodule_run= { |
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184 | .modules = modules |
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185 | }; |