1
2 /*
3 * Copyright (C) Max Romanov
4 * Copyright (C) NGINX, Inc.
5 */
6
7 #include <nxt_main.h>
8 #include <nxt_router.h>
9 #include <nxt_unit.h>
10
11
12 static nxt_int_t nxt_external_start(nxt_task_t *task, nxt_process_data_t *data);
13
14
15 nxt_app_module_t nxt_external_module = {
16 0,
17 NULL,
18 nxt_string("external"),
19 "*",
20 NULL,
21 0,
22 NULL,
23 nxt_external_start,
24 };
25
26
27 extern char **environ;
28
29
30 nxt_inline nxt_int_t
nxt_external_fd_no_cloexec(nxt_task_t * task,nxt_socket_t fd)31 nxt_external_fd_no_cloexec(nxt_task_t *task, nxt_socket_t fd)
32 {
33 int res, flags;
34
35 if (fd == -1) {
36 return NXT_OK;
37 }
38
39 flags = fcntl(fd, F_GETFD);
40
41 if (nxt_slow_path(flags == -1)) {
42 nxt_alert(task, "fcntl(%d, F_GETFD) failed %E", fd, nxt_errno);
43 return NXT_ERROR;
44 }
45
46 flags &= ~FD_CLOEXEC;
47
48 res = fcntl(fd, F_SETFD, flags);
49
50 if (nxt_slow_path(res == -1)) {
51 nxt_alert(task, "fcntl(%d, F_SETFD) failed %E", fd, nxt_errno);
52 return NXT_ERROR;
53 }
54
55 return NXT_OK;
56 }
57
58
59 static nxt_int_t
nxt_external_start(nxt_task_t * task,nxt_process_data_t * data)60 nxt_external_start(nxt_task_t *task, nxt_process_data_t *data)
61 {
62 char **argv;
63 u_char buf[256];
64 u_char *p, *end;
65 uint32_t index;
66 size_t size;
67 nxt_str_t str;
68 nxt_int_t rc;
69 nxt_uint_t i, argc;
70 nxt_port_t *my_port, *proto_port, *router_port;
71 nxt_runtime_t *rt;
72 nxt_conf_value_t *value;
73 nxt_common_app_conf_t *conf;
74 nxt_external_app_conf_t *c;
75
76 rt = task->thread->runtime;
77 conf = data->app;
78
79 proto_port = rt->port_by_type[NXT_PROCESS_PROTOTYPE];
80 router_port = rt->port_by_type[NXT_PROCESS_ROUTER];
81 my_port = nxt_runtime_port_find(rt, nxt_pid, 0);
82
83 if (nxt_slow_path(proto_port == NULL || my_port == NULL
84 || router_port == NULL))
85 {
86 return NXT_ERROR;
87 }
88
89 rc = nxt_external_fd_no_cloexec(task, proto_port->pair[1]);
90 if (nxt_slow_path(rc != NXT_OK)) {
91 return NXT_ERROR;
92 }
93
94 rc = nxt_external_fd_no_cloexec(task, router_port->pair[1]);
95 if (nxt_slow_path(rc != NXT_OK)) {
96 return NXT_ERROR;
97 }
98
99 rc = nxt_external_fd_no_cloexec(task, my_port->pair[0]);
100 if (nxt_slow_path(rc != NXT_OK)) {
101 return NXT_ERROR;
102 }
103
104 rc = nxt_external_fd_no_cloexec(task, my_port->pair[1]);
105 if (nxt_slow_path(rc != NXT_OK)) {
106 return NXT_ERROR;
107 }
108
109 end = buf + sizeof(buf);
110
111 p = nxt_sprintf(buf, end,
112 "%s;%uD;"
113 "%PI,%ud,%d;"
114 "%PI,%ud,%d;"
115 "%PI,%ud,%d,%d;"
116 "%d,%z,%uD,%Z",
117 NXT_VERSION, my_port->process->stream,
118 proto_port->pid, proto_port->id, proto_port->pair[1],
119 router_port->pid, router_port->id, router_port->pair[1],
120 my_port->pid, my_port->id, my_port->pair[0],
121 my_port->pair[1],
122 2, conf->shm_limit, conf->request_limit);
123
124 if (nxt_slow_path(p == end)) {
125 nxt_alert(task, "internal error: buffer too small for NXT_UNIT_INIT");
126
127 return NXT_ERROR;
128 }
129
130 nxt_debug(task, "update "NXT_UNIT_INIT_ENV"=%s", buf);
131
132 rc = setenv(NXT_UNIT_INIT_ENV, (char *) buf, 1);
133 if (nxt_slow_path(rc == -1)) {
134 nxt_alert(task, "setenv("NXT_UNIT_INIT_ENV", %s) failed %E", buf,
135 nxt_errno);
136
137 return NXT_ERROR;
138 }
139
140 c = &conf->u.external;
141
142 argc = 2;
143 size = 0;
144
145 if (c->arguments != NULL) {
146
147 for (index = 0; /* void */ ; index++) {
148 value = nxt_conf_get_array_element(c->arguments, index);
149 if (value == NULL) {
150 break;
151 }
152
153 nxt_conf_get_string(value, &str);
154
155 size += str.length + 1;
156 argc++;
157 }
158 }
159
160 argv = nxt_malloc(argc * sizeof(argv[0]) + size);
161 if (nxt_slow_path(argv == NULL)) {
162 nxt_alert(task, "failed to allocate arguments");
163 return NXT_ERROR;
164 }
165
166 argv[0] = c->executable;
167 i = 1;
168
169 if (c->arguments != NULL) {
170 p = (u_char *) &argv[argc];
171
172 for (index = 0; /* void */ ; index++) {
173 value = nxt_conf_get_array_element(c->arguments, index);
174 if (value == NULL) {
175 break;
176 }
177
178 argv[i++] = (char *) p;
179
180 nxt_conf_get_string(value, &str);
181
182 p = nxt_cpymem(p, str.start, str.length);
183 *p++ = '\0';
184 }
185 }
186
187 argv[i] = NULL;
188
189 (void) execve(c->executable, argv, environ);
190
191 nxt_alert(task, "execve(%s) failed %E", c->executable, nxt_errno);
192
193 nxt_free(argv);
194
195 return NXT_ERROR;
196 }
197