File: prayer_main.c

package info (click to toggle)
prayer 1.3.5-dfsg1-6
  • links: PTS, VCS
  • area: main
  • in suites: buster, sid
  • size: 6,576 kB
  • sloc: ansic: 43,161; makefile: 817; sh: 445; perl: 166
file content (364 lines) | stat: -rw-r--r-- 11,278 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
/* $Cambridge: hermes/src/prayer/servers/prayer_main.c,v 1.3 2008/09/16 09:59:57 dpc22 Exp $ */
/************************************************
 *    Prayer - a Webmail Interface              *
 ************************************************/

/* Copyright (c) University of Cambridge 2000 - 2008 */
/* See the file NOTICE for conditions of use and distribution. */

#include "prayer_shared.h"
#include "prayer.h"
#include "prayer_server.h"

BOOL prayer_main_use_existing(struct prayer *prayer, char *ports)
{
    char *use_ssl, *fd, *next;

    while (ports) {
        if ((next = strchr(ports, ',')))
            *next++ = '\0';

        if (!(use_ssl = strchr(ports, ':')))
            return (NIL);
        *use_ssl++ = '\0';

        if (!(fd = strchr(use_ssl, ':')))
            return (NIL);
        *fd++ = '\0';

        if (((atoi(ports) == 0) || (atoi(fd) == 0)))
            return (NIL);

        if (!strcmp(use_ssl, "1"))
            prayer_http_port_alloc(prayer, atoi(ports), T, atoi(fd));
        else
            prayer_http_port_alloc(prayer, atoi(ports), NIL, atoi(fd));

        ports = next;
    }
    return (T);
}

BOOL prayer_main_exec(struct prayer * prayer, int argc, char *argv[])
{
    struct config *config = prayer->config;
    struct pool *p = pool_create(8192);
    struct buffer *b = buffer_create(p, 256);
    char *cmd;
    char **nargv = pool_alloc(p, (argc + 2) * sizeof(char *));
    int i;
    struct list_item *li;

    bputs(b, "--ports=");
    for (li = prayer->http_port_list->head; li; li = li->next) {
        struct prayer_http_port *fhp = (struct prayer_http_port *) li;

        if (fhp->use_ssl)
            bprintf(b, "%lu:1:%lu,", fhp->port, fhp->sockfd);
        else
            bprintf(b, "%lu:0:%lu,", fhp->port, fhp->sockfd);
    }
    cmd = pool_printf(p, "%s/prayer", config->bin_dir);

    for (i = 0; i < argc; i++)
        nargv[i] = argv[i];
    nargv[argc++] = buffer_fetch(b, 0, buffer_size(b) - 1, NIL);
    nargv[argc] = NIL;

    execv(cmd, nargv);
    prayer_fatal(prayer, "execv(%s) failed: %s", cmd, strerror(errno));
    /* NOTREACHED */
    return (NIL);
}

BOOL
prayer_main_start_session(struct prayer * prayer, int argc, char *argv[])
{
    struct config *config = prayer->config;
    char *cmd = pool_printf(NIL, "%s/prayer-session", config->bin_dir);
    char **nargv = pool_alloc(NIL, (1 + argc) * sizeof(char *));
    int i, j;

    nargv[0] = "prayer-session";
    i = 1;
    j = 1;

    while (i < argc) {
        if (!strcmp(argv[i], "--")) {
            i++;
            while (i < argc)
                nargv[j++] = argv[i++];
        } else if (!strcmp(argv[i], "--config-option")) {
            nargv[j++] = argv[i++];
            if (i < argc)
                nargv[j++] = argv[i++];
        } else
            if (!strncmp
                (argv[i], "--config-file=", strlen("--config-file=")))
            nargv[j++] = argv[i++];
        else
            i++;
    }
    nargv[j] = NIL;

    execv(cmd, nargv);
    prayer_fatal(prayer, "execv(%s) failed: %s", cmd, strerror(errno));
    /* NOTREACHED */
    return (NIL);
}

/* ====================================================================== */

static BOOL prayer_main_write_pid(struct config *config)
{
    char *name = pool_printf(NIL, "%s/prayer.pid", config->pid_dir);
    FILE *file;

    if ((file = fopen(name, "w")) == NIL)
        return (NIL);

    fprintf(file, "%lu\n", (unsigned long) getpid());
    fclose(file);

    return (T);
}

/* ====================================================================== */

int main(int argc, char *argv[])
{
    BOOL want_prefork = T;
    BOOL want_foreground = NIL;
    BOOL want_session = T;
    char *ports = NIL;
    char *config_filename = PRAYER_CONFIG_FILE;
    struct config *config = config_create();
    struct prayer *prayer;
    struct list_item *li;
    int i;
    extern char **environ;
    struct ssl_config ssl_config;

    /* Disable supplementary groups, look for (temporary) unprivileged group */
    if (getuid() == 0) {
        struct group *group;

        setgroups(0, NIL);

        if ((group = getgrnam("other")) != NIL)
            setgid(group->gr_gid);
        else if ((group = getgrnam("nobody")) != NIL)
            setgid(group->gr_gid);
    }

    if (getenv("PRAYER_CONFIG_FILE"))
        config_filename = getenv("PRAYER_CONFIG_FILE");

    initsetproctitle("prayer", argc, argv, environ);

    os_signal_init();

    response_record_version(VERSION_PRAYER);

    for (i = 1; i < argc; i++) {
        if (!strcmp(argv[i], "--help")) {
            fprintf(stderr, "Options:\n");
            fprintf(stderr,
                    ("  --config-file:     Define prayer config file\n"));
            fprintf(stderr,
                    ("                     "
                     "(Overrides compilation default and PRAYER_CONFIG_FILE)\n"));
            fprintf(stderr,
                    ("  --config-option:   Override single configuration option\n"));
            fprintf(stderr, "\n");
            fprintf(stderr,
                    ("  --foreground:      "
                     "Run single threaded server in  foreground\n"));
            fprintf(stderr,
                    ("  --disable-prefork: Run as simple fork()/exec() daemon\n"));
            fprintf(stderr,
                    ("  --disable-session: Don't start up prayer-session server\n"));

            fprintf(stderr,
                    ("  --help:            Show this list of options\n"));
            fprintf(stderr,
                    ("  --:                "
                     "End of prayer options: remaining options will be passed\n"));
            fprintf(stderr,
                    ("                     to prayer-session server process\n"));
            exit(0);
        } else if (!strcmp(argv[i], "--foreground"))
            want_foreground = T;
        else if (!strcmp(argv[i], "--disable-prefork"))
            want_prefork = NIL;
        else if (!strcmp(argv[i], "--disable-session"))
            want_session = NIL;
        else if (!strncmp(argv[i],
                          "--config-file=", strlen("--config-file="))) {
            config_filename = strdup(argv[i] + strlen("--config-file="));
        } else if (!strcmp(argv[i], "--config-option")) {
            i++;                /* Processes next argv */
        } else if (!strncmp(argv[i], "--ports=", strlen("--ports="))) {
            ports = argv[i] + strlen("--ports=");
        } else if (!strcmp(argv[i], "--")) {
            continue;
        } else {
            fprintf(stderr, "Unknown option: %s\n", argv[i]);
            exit(1);
        }
    }

    config = config_create();
    if (!config_parse_file(config, config_filename))
        exit(1);

    for (i = 1; i < argc; i++) {
        if (!strcmp(argv[i], "--config-option")) {
            if (++i < argc) {
                if (!config_parse_option(config, strdup(argv[i])))
                    exit(1);
            } else
                fprintf(stderr, "--config processes following option");
        }
    }

    if (!config_check(config))
        exit(1);

    if (!config_expand(config))
        exit(1);

    /* Generate a clean copy of the configuration without all of the noise */
    {
        struct config *config_clean = config_clone_parsed(config);

        config_free(config);
        config = config_clean;
    }

    /* Set up prayer frontend structure to bind everything together */
    prayer = prayer_create(config);

    if (ports == NIL) {
        if (config->http_port_list == NIL)
            prayer_fatal(prayer, "No HTTP or HTTPS ports defined");

        for (li = config->http_port_list->head; li; li = li->next) {
            struct config_http_port *chp = (struct config_http_port *) li;

            prayer_http_port_open(prayer, chp->port, chp->use_ssl,
                                  chp->interface);
        }
    } else if (!prayer_main_use_existing(prayer, ports))
        prayer_fatal(prayer, "Invalid --ports argument");

    if (list_length(prayer->http_port_list) == 0L)
        prayer_fatal(prayer, "No HTTP or HTTPS ports active");

    /* Don't need root privs after ports bound, files open */

    if (getuid() == 0) {
        if ((config->prayer_uid == 0) || (config->prayer_gid == 0))
            log_fatal("Configured to run as root!");

        if (config->prayer_gid) {
            setgid(config->prayer_gid);

            if (config->prayer_user && config->prayer_user[0])
                initgroups(config->prayer_user, config->prayer_gid);
        }

        if (config->prayer_uid)
            setuid(config->prayer_uid);

        if (getuid() == 0)
            log_fatal("Failed to lose root priveledges");       /* Stop impossible loop */

        /* Reexec after losing root privs to prevent core dump paranoia */
        if (ports == NIL) {
            prayer_main_exec(prayer, argc, argv);
            /* Should be redundant */
            prayer_fatal(prayer, "prayer_main_exec() failed");
        }
    }

    if (getuid() == 0)
        log_fatal("Configured to run as root!");

    config_mkdirs(config);
    log_misc_init(config, argv[0], "prayer");

    prayer_log_open(prayer);

    dlopen_templates(config->template_set, "_frontend");

    if (config->limit_vm)
        os_limit_vm(config->limit_vm);

    /* Ports have bound successfully and we've lost root privilege */
    /* Fork off a session server process now if we want one. */
    if (want_session) {
        pid_t pid = fork();

        if (pid < 0)
            prayer_fatal(prayer,
                         "Couldn't start session server - fork() failed: %s",
                         strerror(errno));

        if (pid == 0) {
            /* Child process */ ;

            /* Shut down unneeded file descriptors */
            prayer_http_port_close(prayer);

            /* Including stdin, stdout, stderr */
            close(0);
            close(1);
            close(2);
            open("/dev/null", O_RDONLY);        /* Reopen stdin */
            open("/dev/null", O_WRONLY);        /* Reopen stdout */
            open("/dev/null", O_WRONLY);        /* Reopen stderr */

            prayer_main_start_session(prayer, argc, argv);
        }
    }

    if (config->tmp_dir)
        chdir(config->tmp_dir);

    /* Required for SSL stuff */
    config_extract_ssl(config, &ssl_config);
    iostream_init(&ssl_config);

    if (config->prayer_background && !want_foreground) {
        pid_t pid = fork();

        if (pid < 0)
            prayer_fatal(prayer,
                         "Failed to background server - fork() failed: %s",
                         strerror(errno));

        if (pid > 0)
            exit(0);            /* Parent process */

        /* Child process */

        /* Shut down stdin, stdout, stderr */
        close(0);
        close(1);
        close(2);
        open("/dev/null", O_RDONLY);    /* Reopen stdin */
        open("/dev/null", O_WRONLY);    /* Reopen stdout */
        open("/dev/null", O_WRONLY);    /* Reopen stderr */
    }

    prayer_main_write_pid(config);

    if (want_prefork && !want_foreground)
        prayer_server_prefork(prayer);
    else
        prayer_server(prayer, want_foreground);

    /* NOTREACHED */
    return (0);
}