Andrew's git / gitweb.git / imap-send.c
?
imap-send.con commit pkt-line: provide a LARGE_PACKET_MAX static buffer (74543a0)
   1/*
   2 * git-imap-send - drops patches into an imap Drafts folder
   3 *                 derived from isync/mbsync - mailbox synchronizer
   4 *
   5 * Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org>
   6 * Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net>
   7 * Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu>
   8 * Copyright (C) 2006 Mike McCormack
   9 *
  10 *  This program is free software; you can redistribute it and/or modify
  11 *  it under the terms of the GNU General Public License as published by
  12 *  the Free Software Foundation; either version 2 of the License, or
  13 *  (at your option) any later version.
  14 *
  15 *  This program is distributed in the hope that it will be useful,
  16 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 *  GNU General Public License for more details.
  19 *
  20 *  You should have received a copy of the GNU General Public License
  21 *  along with this program; if not, write to the Free Software
  22 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23 */
  24
  25#include "cache.h"
  26#include "exec_cmd.h"
  27#include "run-command.h"
  28#include "prompt.h"
  29#ifdef NO_OPENSSL
  30typedef void *SSL;
  31#else
  32#include <openssl/evp.h>
  33#include <openssl/hmac.h>
  34#endif
  35
  36static const char imap_send_usage[] = "git imap-send < <mbox>";
  37
  38#undef DRV_OK
  39#define DRV_OK          0
  40#define DRV_MSG_BAD     -1
  41#define DRV_BOX_BAD     -2
  42#define DRV_STORE_BAD   -3
  43
  44static int Verbose, Quiet;
  45
  46__attribute__((format (printf, 1, 2)))
  47static void imap_info(const char *, ...);
  48__attribute__((format (printf, 1, 2)))
  49static void imap_warn(const char *, ...);
  50
  51static char *next_arg(char **);
  52
  53__attribute__((format (printf, 3, 4)))
  54static int nfsnprintf(char *buf, int blen, const char *fmt, ...);
  55
  56static int nfvasprintf(char **strp, const char *fmt, va_list ap)
  57{
  58        int len;
  59        char tmp[8192];
  60
  61        len = vsnprintf(tmp, sizeof(tmp), fmt, ap);
  62        if (len < 0)
  63                die("Fatal: Out of memory");
  64        if (len >= sizeof(tmp))
  65                die("imap command overflow!");
  66        *strp = xmemdupz(tmp, len);
  67        return len;
  68}
  69
  70struct imap_server_conf {
  71        char *name;
  72        char *tunnel;
  73        char *host;
  74        int port;
  75        char *user;
  76        char *pass;
  77        int use_ssl;
  78        int ssl_verify;
  79        int use_html;
  80        char *auth_method;
  81};
  82
  83static struct imap_server_conf server = {
  84        NULL,   /* name */
  85        NULL,   /* tunnel */
  86        NULL,   /* host */
  87        0,      /* port */
  88        NULL,   /* user */
  89        NULL,   /* pass */
  90        0,      /* use_ssl */
  91        1,      /* ssl_verify */
  92        0,      /* use_html */
  93        NULL,   /* auth_method */
  94};
  95
  96struct imap_socket {
  97        int fd[2];
  98        SSL *ssl;
  99};
 100
 101struct imap_buffer {
 102        struct imap_socket sock;
 103        int bytes;
 104        int offset;
 105        char buf[1024];
 106};
 107
 108struct imap_cmd;
 109
 110struct imap {
 111        int uidnext; /* from SELECT responses */
 112        unsigned caps, rcaps; /* CAPABILITY results */
 113        /* command queue */
 114        int nexttag, num_in_progress, literal_pending;
 115        struct imap_cmd *in_progress, **in_progress_append;
 116        struct imap_buffer buf; /* this is BIG, so put it last */
 117};
 118
 119struct imap_store {
 120        /* currently open mailbox */
 121        const char *name; /* foreign! maybe preset? */
 122        int uidvalidity;
 123        struct imap *imap;
 124        const char *prefix;
 125};
 126
 127struct imap_cmd_cb {
 128        int (*cont)(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt);
 129        void (*done)(struct imap_store *ctx, struct imap_cmd *cmd, int response);
 130        void *ctx;
 131        char *data;
 132        int dlen;
 133        int uid;
 134        unsigned create:1, trycreate:1;
 135};
 136
 137struct imap_cmd {
 138        struct imap_cmd *next;
 139        struct imap_cmd_cb cb;
 140        char *cmd;
 141        int tag;
 142};
 143
 144#define CAP(cap) (imap->caps & (1 << (cap)))
 145
 146enum CAPABILITY {
 147        NOLOGIN = 0,
 148        UIDPLUS,
 149        LITERALPLUS,
 150        NAMESPACE,
 151        STARTTLS,
 152        AUTH_CRAM_MD5
 153};
 154
 155static const char *cap_list[] = {
 156        "LOGINDISABLED",
 157        "UIDPLUS",
 158        "LITERAL+",
 159        "NAMESPACE",
 160        "STARTTLS",
 161        "AUTH=CRAM-MD5",
 162};
 163
 164#define RESP_OK    0
 165#define RESP_NO    1
 166#define RESP_BAD   2
 167
 168static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);
 169
 170
 171#ifndef NO_OPENSSL
 172static void ssl_socket_perror(const char *func)
 173{
 174        fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
 175}
 176#endif
 177
 178static void socket_perror(const char *func, struct imap_socket *sock, int ret)
 179{
 180#ifndef NO_OPENSSL
 181        if (sock->ssl) {
 182                int sslerr = SSL_get_error(sock->ssl, ret);
 183                switch (sslerr) {
 184                case SSL_ERROR_NONE:
 185                        break;
 186                case SSL_ERROR_SYSCALL:
 187                        perror("SSL_connect");
 188                        break;
 189                default:
 190                        ssl_socket_perror("SSL_connect");
 191                        break;
 192                }
 193        } else
 194#endif
 195        {
 196                if (ret < 0)
 197                        perror(func);
 198                else
 199                        fprintf(stderr, "%s: unexpected EOF\n", func);
 200        }
 201}
 202
 203static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
 204{
 205#ifdef NO_OPENSSL
 206        fprintf(stderr, "SSL requested but SSL support not compiled in\n");
 207        return -1;
 208#else
 209#if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
 210        const SSL_METHOD *meth;
 211#else
 212        SSL_METHOD *meth;
 213#endif
 214        SSL_CTX *ctx;
 215        int ret;
 216
 217        SSL_library_init();
 218        SSL_load_error_strings();
 219
 220        if (use_tls_only)
 221                meth = TLSv1_method();
 222        else
 223                meth = SSLv23_method();
 224
 225        if (!meth) {
 226                ssl_socket_perror("SSLv23_method");
 227                return -1;
 228        }
 229
 230        ctx = SSL_CTX_new(meth);
 231
 232        if (verify)
 233                SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
 234
 235        if (!SSL_CTX_set_default_verify_paths(ctx)) {
 236                ssl_socket_perror("SSL_CTX_set_default_verify_paths");
 237                return -1;
 238        }
 239        sock->ssl = SSL_new(ctx);
 240        if (!sock->ssl) {
 241                ssl_socket_perror("SSL_new");
 242                return -1;
 243        }
 244        if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
 245                ssl_socket_perror("SSL_set_rfd");
 246                return -1;
 247        }
 248        if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
 249                ssl_socket_perror("SSL_set_wfd");
 250                return -1;
 251        }
 252
 253        ret = SSL_connect(sock->ssl);
 254        if (ret <= 0) {
 255                socket_perror("SSL_connect", sock, ret);
 256                return -1;
 257        }
 258
 259        return 0;
 260#endif
 261}
 262
 263static int socket_read(struct imap_socket *sock, char *buf, int len)
 264{
 265        ssize_t n;
 266#ifndef NO_OPENSSL
 267        if (sock->ssl)
 268                n = SSL_read(sock->ssl, buf, len);
 269        else
 270#endif
 271                n = xread(sock->fd[0], buf, len);
 272        if (n <= 0) {
 273                socket_perror("read", sock, n);
 274                close(sock->fd[0]);
 275                close(sock->fd[1]);
 276                sock->fd[0] = sock->fd[1] = -1;
 277        }
 278        return n;
 279}
 280
 281static int socket_write(struct imap_socket *sock, const char *buf, int len)
 282{
 283        int n;
 284#ifndef NO_OPENSSL
 285        if (sock->ssl)
 286                n = SSL_write(sock->ssl, buf, len);
 287        else
 288#endif
 289                n = write_in_full(sock->fd[1], buf, len);
 290        if (n != len) {
 291                socket_perror("write", sock, n);
 292                close(sock->fd[0]);
 293                close(sock->fd[1]);
 294                sock->fd[0] = sock->fd[1] = -1;
 295        }
 296        return n;
 297}
 298
 299static void socket_shutdown(struct imap_socket *sock)
 300{
 301#ifndef NO_OPENSSL
 302        if (sock->ssl) {
 303                SSL_shutdown(sock->ssl);
 304                SSL_free(sock->ssl);
 305        }
 306#endif
 307        close(sock->fd[0]);
 308        close(sock->fd[1]);
 309}
 310
 311/* simple line buffering */
 312static int buffer_gets(struct imap_buffer *b, char **s)
 313{
 314        int n;
 315        int start = b->offset;
 316
 317        *s = b->buf + start;
 318
 319        for (;;) {
 320                /* make sure we have enough data to read the \r\n sequence */
 321                if (b->offset + 1 >= b->bytes) {
 322                        if (start) {
 323                                /* shift down used bytes */
 324                                *s = b->buf;
 325
 326                                assert(start <= b->bytes);
 327                                n = b->bytes - start;
 328
 329                                if (n)
 330                                        memmove(b->buf, b->buf + start, n);
 331                                b->offset -= start;
 332                                b->bytes = n;
 333                                start = 0;
 334                        }
 335
 336                        n = socket_read(&b->sock, b->buf + b->bytes,
 337                                         sizeof(b->buf) - b->bytes);
 338
 339                        if (n <= 0)
 340                                return -1;
 341
 342                        b->bytes += n;
 343                }
 344
 345                if (b->buf[b->offset] == '\r') {
 346                        assert(b->offset + 1 < b->bytes);
 347                        if (b->buf[b->offset + 1] == '\n') {
 348                                b->buf[b->offset] = 0;  /* terminate the string */
 349                                b->offset += 2; /* next line */
 350                                if (Verbose)
 351                                        puts(*s);
 352                                return 0;
 353                        }
 354                }
 355
 356                b->offset++;
 357        }
 358        /* not reached */
 359}
 360
 361static void imap_info(const char *msg, ...)
 362{
 363        va_list va;
 364
 365        if (!Quiet) {
 366                va_start(va, msg);
 367                vprintf(msg, va);
 368                va_end(va);
 369                fflush(stdout);
 370        }
 371}
 372
 373static void imap_warn(const char *msg, ...)
 374{
 375        va_list va;
 376
 377        if (Quiet < 2) {
 378                va_start(va, msg);
 379                vfprintf(stderr, msg, va);
 380                va_end(va);
 381        }
 382}
 383
 384static char *next_arg(char **s)
 385{
 386        char *ret;
 387
 388        if (!s || !*s)
 389                return NULL;
 390        while (isspace((unsigned char) **s))
 391                (*s)++;
 392        if (!**s) {
 393                *s = NULL;
 394                return NULL;
 395        }
 396        if (**s == '"') {
 397                ++*s;
 398                ret = *s;
 399                *s = strchr(*s, '"');
 400        } else {
 401                ret = *s;
 402                while (**s && !isspace((unsigned char) **s))
 403                        (*s)++;
 404        }
 405        if (*s) {
 406                if (**s)
 407                        *(*s)++ = 0;
 408                if (!**s)
 409                        *s = NULL;
 410        }
 411        return ret;
 412}
 413
 414static int nfsnprintf(char *buf, int blen, const char *fmt, ...)
 415{
 416        int ret;
 417        va_list va;
 418
 419        va_start(va, fmt);
 420        if (blen <= 0 || (unsigned)(ret = vsnprintf(buf, blen, fmt, va)) >= (unsigned)blen)
 421                die("Fatal: buffer too small. Please report a bug.");
 422        va_end(va);
 423        return ret;
 424}
 425
 426static struct imap_cmd *v_issue_imap_cmd(struct imap_store *ctx,
 427                                         struct imap_cmd_cb *cb,
 428                                         const char *fmt, va_list ap)
 429{
 430        struct imap *imap = ctx->imap;
 431        struct imap_cmd *cmd;
 432        int n, bufl;
 433        char buf[1024];
 434
 435        cmd = xmalloc(sizeof(struct imap_cmd));
 436        nfvasprintf(&cmd->cmd, fmt, ap);
 437        cmd->tag = ++imap->nexttag;
 438
 439        if (cb)
 440                cmd->cb = *cb;
 441        else
 442                memset(&cmd->cb, 0, sizeof(cmd->cb));
 443
 444        while (imap->literal_pending)
 445                get_cmd_result(ctx, NULL);
 446
 447        if (!cmd->cb.data)
 448                bufl = nfsnprintf(buf, sizeof(buf), "%d %s\r\n", cmd->tag, cmd->cmd);
 449        else
 450                bufl = nfsnprintf(buf, sizeof(buf), "%d %s{%d%s}\r\n",
 451                                  cmd->tag, cmd->cmd, cmd->cb.dlen,
 452                                  CAP(LITERALPLUS) ? "+" : "");
 453
 454        if (Verbose) {
 455                if (imap->num_in_progress)
 456                        printf("(%d in progress) ", imap->num_in_progress);
 457                if (memcmp(cmd->cmd, "LOGIN", 5))
 458                        printf(">>> %s", buf);
 459                else
 460                        printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
 461        }
 462        if (socket_write(&imap->buf.sock, buf, bufl) != bufl) {
 463                free(cmd->cmd);
 464                free(cmd);
 465                if (cb)
 466                        free(cb->data);
 467                return NULL;
 468        }
 469        if (cmd->cb.data) {
 470                if (CAP(LITERALPLUS)) {
 471                        n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
 472                        free(cmd->cb.data);
 473                        if (n != cmd->cb.dlen ||
 474                            socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
 475                                free(cmd->cmd);
 476                                free(cmd);
 477                                return NULL;
 478                        }
 479                        cmd->cb.data = NULL;
 480                } else
 481                        imap->literal_pending = 1;
 482        } else if (cmd->cb.cont)
 483                imap->literal_pending = 1;
 484        cmd->next = NULL;
 485        *imap->in_progress_append = cmd;
 486        imap->in_progress_append = &cmd->next;
 487        imap->num_in_progress++;
 488        return cmd;
 489}
 490
 491__attribute__((format (printf, 3, 4)))
 492static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
 493                                       struct imap_cmd_cb *cb,
 494                                       const char *fmt, ...)
 495{
 496        struct imap_cmd *ret;
 497        va_list ap;
 498
 499        va_start(ap, fmt);
 500        ret = v_issue_imap_cmd(ctx, cb, fmt, ap);
 501        va_end(ap);
 502        return ret;
 503}
 504
 505__attribute__((format (printf, 3, 4)))
 506static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
 507                     const char *fmt, ...)
 508{
 509        va_list ap;
 510        struct imap_cmd *cmdp;
 511
 512        va_start(ap, fmt);
 513        cmdp = v_issue_imap_cmd(ctx, cb, fmt, ap);
 514        va_end(ap);
 515        if (!cmdp)
 516                return RESP_BAD;
 517
 518        return get_cmd_result(ctx, cmdp);
 519}
 520
 521__attribute__((format (printf, 3, 4)))
 522static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
 523                       const char *fmt, ...)
 524{
 525        va_list ap;
 526        struct imap_cmd *cmdp;
 527
 528        va_start(ap, fmt);
 529        cmdp = v_issue_imap_cmd(ctx, cb, fmt, ap);
 530        va_end(ap);
 531        if (!cmdp)
 532                return DRV_STORE_BAD;
 533
 534        switch (get_cmd_result(ctx, cmdp)) {
 535        case RESP_BAD: return DRV_STORE_BAD;
 536        case RESP_NO: return DRV_MSG_BAD;
 537        default: return DRV_OK;
 538        }
 539}
 540
 541static int skip_imap_list_l(char **sp, int level)
 542{
 543        char *s = *sp;
 544
 545        for (;;) {
 546                while (isspace((unsigned char)*s))
 547                        s++;
 548                if (level && *s == ')') {
 549                        s++;
 550                        break;
 551                }
 552                if (*s == '(') {
 553                        /* sublist */
 554                        s++;
 555                        if (skip_imap_list_l(&s, level + 1))
 556                                goto bail;
 557                } else if (*s == '"') {
 558                        /* quoted string */
 559                        s++;
 560                        for (; *s != '"'; s++)
 561                                if (!*s)
 562                                        goto bail;
 563                        s++;
 564                } else {
 565                        /* atom */
 566                        for (; *s && !isspace((unsigned char)*s); s++)
 567                                if (level && *s == ')')
 568                                        break;
 569                }
 570
 571                if (!level)
 572                        break;
 573                if (!*s)
 574                        goto bail;
 575        }
 576        *sp = s;
 577        return 0;
 578
 579bail:
 580        return -1;
 581}
 582
 583static void skip_list(char **sp)
 584{
 585        skip_imap_list_l(sp, 0);
 586}
 587
 588static void parse_capability(struct imap *imap, char *cmd)
 589{
 590        char *arg;
 591        unsigned i;
 592
 593        imap->caps = 0x80000000;
 594        while ((arg = next_arg(&cmd)))
 595                for (i = 0; i < ARRAY_SIZE(cap_list); i++)
 596                        if (!strcmp(cap_list[i], arg))
 597                                imap->caps |= 1 << i;
 598        imap->rcaps = imap->caps;
 599}
 600
 601static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
 602                               char *s)
 603{
 604        struct imap *imap = ctx->imap;
 605        char *arg, *p;
 606
 607        if (*s != '[')
 608                return RESP_OK;         /* no response code */
 609        s++;
 610        if (!(p = strchr(s, ']'))) {
 611                fprintf(stderr, "IMAP error: malformed response code\n");
 612                return RESP_BAD;
 613        }
 614        *p++ = 0;
 615        arg = next_arg(&s);
 616        if (!strcmp("UIDVALIDITY", arg)) {
 617                if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg))) {
 618                        fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
 619                        return RESP_BAD;
 620                }
 621        } else if (!strcmp("UIDNEXT", arg)) {
 622                if (!(arg = next_arg(&s)) || !(imap->uidnext = atoi(arg))) {
 623                        fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
 624                        return RESP_BAD;
 625                }
 626        } else if (!strcmp("CAPABILITY", arg)) {
 627                parse_capability(imap, s);
 628        } else if (!strcmp("ALERT", arg)) {
 629                /* RFC2060 says that these messages MUST be displayed
 630                 * to the user
 631                 */
 632                for (; isspace((unsigned char)*p); p++);
 633                fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
 634        } else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
 635                if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg)) ||
 636                    !(arg = next_arg(&s)) || !(*(int *)cb->ctx = atoi(arg))) {
 637                        fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
 638                        return RESP_BAD;
 639                }
 640        }
 641        return RESP_OK;
 642}
 643
 644static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
 645{
 646        struct imap *imap = ctx->imap;
 647        struct imap_cmd *cmdp, **pcmdp, *ncmdp;
 648        char *cmd, *arg, *arg1, *p;
 649        int n, resp, resp2, tag;
 650
 651        for (;;) {
 652                if (buffer_gets(&imap->buf, &cmd))
 653                        return RESP_BAD;
 654
 655                arg = next_arg(&cmd);
 656                if (*arg == '*') {
 657                        arg = next_arg(&cmd);
 658                        if (!arg) {
 659                                fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 660                                return RESP_BAD;
 661                        }
 662
 663                        if (!strcmp("NAMESPACE", arg)) {
 664                                /* rfc2342 NAMESPACE response. */
 665                                skip_list(&cmd); /* Personal mailboxes */
 666                                skip_list(&cmd); /* Others' mailboxes */
 667                                skip_list(&cmd); /* Shared mailboxes */
 668                        } else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
 669                                   !strcmp("NO", arg) || !strcmp("BYE", arg)) {
 670                                if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
 671                                        return resp;
 672                        } else if (!strcmp("CAPABILITY", arg)) {
 673                                parse_capability(imap, cmd);
 674                        } else if ((arg1 = next_arg(&cmd))) {
 675                                ; /*
 676                                   * Unhandled response-data with at least two words.
 677                                   * Ignore it.
 678                                   *
 679                                   * NEEDSWORK: Previously this case handled '<num> EXISTS'
 680                                   * and '<num> RECENT' but as a probably-unintended side
 681                                   * effect it ignores other unrecognized two-word
 682                                   * responses.  imap-send doesn't ever try to read
 683                                   * messages or mailboxes these days, so consider
 684                                   * eliminating this case.
 685                                   */
 686                        } else {
 687                                fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 688                                return RESP_BAD;
 689                        }
 690                } else if (!imap->in_progress) {
 691                        fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
 692                        return RESP_BAD;
 693                } else if (*arg == '+') {
 694                        /* This can happen only with the last command underway, as
 695                           it enforces a round-trip. */
 696                        cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
 697                               offsetof(struct imap_cmd, next));
 698                        if (cmdp->cb.data) {
 699                                n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
 700                                free(cmdp->cb.data);
 701                                cmdp->cb.data = NULL;
 702                                if (n != (int)cmdp->cb.dlen)
 703                                        return RESP_BAD;
 704                        } else if (cmdp->cb.cont) {
 705                                if (cmdp->cb.cont(ctx, cmdp, cmd))
 706                                        return RESP_BAD;
 707                        } else {
 708                                fprintf(stderr, "IMAP error: unexpected command continuation request\n");
 709                                return RESP_BAD;
 710                        }
 711                        if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
 712                                return RESP_BAD;
 713                        if (!cmdp->cb.cont)
 714                                imap->literal_pending = 0;
 715                        if (!tcmd)
 716                                return DRV_OK;
 717                } else {
 718                        tag = atoi(arg);
 719                        for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
 720                                if (cmdp->tag == tag)
 721                                        goto gottag;
 722                        fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
 723                        return RESP_BAD;
 724                gottag:
 725                        if (!(*pcmdp = cmdp->next))
 726                                imap->in_progress_append = pcmdp;
 727                        imap->num_in_progress--;
 728                        if (cmdp->cb.cont || cmdp->cb.data)
 729                                imap->literal_pending = 0;
 730                        arg = next_arg(&cmd);
 731                        if (!strcmp("OK", arg))
 732                                resp = DRV_OK;
 733                        else {
 734                                if (!strcmp("NO", arg)) {
 735                                        if (cmdp->cb.create && cmd && (cmdp->cb.trycreate || !memcmp(cmd, "[TRYCREATE]", 11))) { /* SELECT, APPEND or UID COPY */
 736                                                p = strchr(cmdp->cmd, '"');
 737                                                if (!issue_imap_cmd(ctx, NULL, "CREATE \"%.*s\"", (int)(strchr(p + 1, '"') - p + 1), p)) {
 738                                                        resp = RESP_BAD;
 739                                                        goto normal;
 740                                                }
 741                                                /* not waiting here violates the spec, but a server that does not
 742                                                   grok this nonetheless violates it too. */
 743                                                cmdp->cb.create = 0;
 744                                                if (!(ncmdp = issue_imap_cmd(ctx, &cmdp->cb, "%s", cmdp->cmd))) {
 745                                                        resp = RESP_BAD;
 746                                                        goto normal;
 747                                                }
 748                                                free(cmdp->cmd);
 749                                                free(cmdp);
 750                                                if (!tcmd)
 751                                                        return 0;       /* ignored */
 752                                                if (cmdp == tcmd)
 753                                                        tcmd = ncmdp;
 754                                                continue;
 755                                        }
 756                                        resp = RESP_NO;
 757                                } else /*if (!strcmp("BAD", arg))*/
 758                                        resp = RESP_BAD;
 759                                fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
 760                                         memcmp(cmdp->cmd, "LOGIN", 5) ?
 761                                                        cmdp->cmd : "LOGIN <user> <pass>",
 762                                                        arg, cmd ? cmd : "");
 763                        }
 764                        if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
 765                                resp = resp2;
 766                normal:
 767                        if (cmdp->cb.done)
 768                                cmdp->cb.done(ctx, cmdp, resp);
 769                        free(cmdp->cb.data);
 770                        free(cmdp->cmd);
 771                        free(cmdp);
 772                        if (!tcmd || tcmd == cmdp)
 773                                return resp;
 774                }
 775        }
 776        /* not reached */
 777}
 778
 779static void imap_close_server(struct imap_store *ictx)
 780{
 781        struct imap *imap = ictx->imap;
 782
 783        if (imap->buf.sock.fd[0] != -1) {
 784                imap_exec(ictx, NULL, "LOGOUT");
 785                socket_shutdown(&imap->buf.sock);
 786        }
 787        free(imap);
 788}
 789
 790static void imap_close_store(struct imap_store *ctx)
 791{
 792        imap_close_server(ctx);
 793        free(ctx);
 794}
 795
 796#ifndef NO_OPENSSL
 797
 798/*
 799 * hexchar() and cram() functions are based on the code from the isync
 800 * project (http://isync.sf.net/).
 801 */
 802static char hexchar(unsigned int b)
 803{
 804        return b < 10 ? '0' + b : 'a' + (b - 10);
 805}
 806
 807#define ENCODED_SIZE(n) (4*((n+2)/3))
 808static char *cram(const char *challenge_64, const char *user, const char *pass)
 809{
 810        int i, resp_len, encoded_len, decoded_len;
 811        HMAC_CTX hmac;
 812        unsigned char hash[16];
 813        char hex[33];
 814        char *response, *response_64, *challenge;
 815
 816        /*
 817         * length of challenge_64 (i.e. base-64 encoded string) is a good
 818         * enough upper bound for challenge (decoded result).
 819         */
 820        encoded_len = strlen(challenge_64);
 821        challenge = xmalloc(encoded_len);
 822        decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
 823                                      (unsigned char *)challenge_64, encoded_len);
 824        if (decoded_len < 0)
 825                die("invalid challenge %s", challenge_64);
 826        HMAC_Init(&hmac, (unsigned char *)pass, strlen(pass), EVP_md5());
 827        HMAC_Update(&hmac, (unsigned char *)challenge, decoded_len);
 828        HMAC_Final(&hmac, hash, NULL);
 829        HMAC_CTX_cleanup(&hmac);
 830
 831        hex[32] = 0;
 832        for (i = 0; i < 16; i++) {
 833                hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
 834                hex[2 * i + 1] = hexchar(hash[i] & 0xf);
 835        }
 836
 837        /* response: "<user> <digest in hex>" */
 838        resp_len = strlen(user) + 1 + strlen(hex) + 1;
 839        response = xmalloc(resp_len);
 840        sprintf(response, "%s %s", user, hex);
 841
 842        response_64 = xmalloc(ENCODED_SIZE(resp_len) + 1);
 843        encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
 844                                      (unsigned char *)response, resp_len);
 845        if (encoded_len < 0)
 846                die("EVP_EncodeBlock error");
 847        response_64[encoded_len] = '\0';
 848        return (char *)response_64;
 849}
 850
 851#else
 852
 853static char *cram(const char *challenge_64, const char *user, const char *pass)
 854{
 855        die("If you want to use CRAM-MD5 authenticate method, "
 856            "you have to build git-imap-send with OpenSSL library.");
 857}
 858
 859#endif
 860
 861static int auth_cram_md5(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt)
 862{
 863        int ret;
 864        char *response;
 865
 866        response = cram(prompt, server.user, server.pass);
 867
 868        ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
 869        if (ret != strlen(response))
 870                return error("IMAP error: sending response failed");
 871
 872        free(response);
 873
 874        return 0;
 875}
 876
 877static struct imap_store *imap_open_store(struct imap_server_conf *srvc)
 878{
 879        struct imap_store *ctx;
 880        struct imap *imap;
 881        char *arg, *rsp;
 882        int s = -1, preauth;
 883
 884        ctx = xcalloc(sizeof(*ctx), 1);
 885
 886        ctx->imap = imap = xcalloc(sizeof(*imap), 1);
 887        imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
 888        imap->in_progress_append = &imap->in_progress;
 889
 890        /* open connection to IMAP server */
 891
 892        if (srvc->tunnel) {
 893                const char *argv[] = { srvc->tunnel, NULL };
 894                struct child_process tunnel = {NULL};
 895
 896                imap_info("Starting tunnel '%s'... ", srvc->tunnel);
 897
 898                tunnel.argv = argv;
 899                tunnel.use_shell = 1;
 900                tunnel.in = -1;
 901                tunnel.out = -1;
 902                if (start_command(&tunnel))
 903                        die("cannot start proxy %s", argv[0]);
 904
 905                imap->buf.sock.fd[0] = tunnel.out;
 906                imap->buf.sock.fd[1] = tunnel.in;
 907
 908                imap_info("ok\n");
 909        } else {
 910#ifndef NO_IPV6
 911                struct addrinfo hints, *ai0, *ai;
 912                int gai;
 913                char portstr[6];
 914
 915                snprintf(portstr, sizeof(portstr), "%d", srvc->port);
 916
 917                memset(&hints, 0, sizeof(hints));
 918                hints.ai_socktype = SOCK_STREAM;
 919                hints.ai_protocol = IPPROTO_TCP;
 920
 921                imap_info("Resolving %s... ", srvc->host);
 922                gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
 923                if (gai) {
 924                        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
 925                        goto bail;
 926                }
 927                imap_info("ok\n");
 928
 929                for (ai0 = ai; ai; ai = ai->ai_next) {
 930                        char addr[NI_MAXHOST];
 931
 932                        s = socket(ai->ai_family, ai->ai_socktype,
 933                                   ai->ai_protocol);
 934                        if (s < 0)
 935                                continue;
 936
 937                        getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
 938                                    sizeof(addr), NULL, 0, NI_NUMERICHOST);
 939                        imap_info("Connecting to [%s]:%s... ", addr, portstr);
 940
 941                        if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
 942                                close(s);
 943                                s = -1;
 944                                perror("connect");
 945                                continue;
 946                        }
 947
 948                        break;
 949                }
 950                freeaddrinfo(ai0);
 951#else /* NO_IPV6 */
 952                struct hostent *he;
 953                struct sockaddr_in addr;
 954
 955                memset(&addr, 0, sizeof(addr));
 956                addr.sin_port = htons(srvc->port);
 957                addr.sin_family = AF_INET;
 958
 959                imap_info("Resolving %s... ", srvc->host);
 960                he = gethostbyname(srvc->host);
 961                if (!he) {
 962                        perror("gethostbyname");
 963                        goto bail;
 964                }
 965                imap_info("ok\n");
 966
 967                addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
 968
 969                s = socket(PF_INET, SOCK_STREAM, 0);
 970
 971                imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
 972                if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
 973                        close(s);
 974                        s = -1;
 975                        perror("connect");
 976                }
 977#endif
 978                if (s < 0) {
 979                        fputs("Error: unable to connect to server.\n", stderr);
 980                        goto bail;
 981                }
 982
 983                imap->buf.sock.fd[0] = s;
 984                imap->buf.sock.fd[1] = dup(s);
 985
 986                if (srvc->use_ssl &&
 987                    ssl_socket_connect(&imap->buf.sock, 0, srvc->ssl_verify)) {
 988                        close(s);
 989                        goto bail;
 990                }
 991                imap_info("ok\n");
 992        }
 993
 994        /* read the greeting string */
 995        if (buffer_gets(&imap->buf, &rsp)) {
 996                fprintf(stderr, "IMAP error: no greeting response\n");
 997                goto bail;
 998        }
 999        arg = next_arg(&rsp);
1000        if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1001                fprintf(stderr, "IMAP error: invalid greeting response\n");
1002                goto bail;
1003        }
1004        preauth = 0;
1005        if (!strcmp("PREAUTH", arg))
1006                preauth = 1;
1007        else if (strcmp("OK", arg) != 0) {
1008                fprintf(stderr, "IMAP error: unknown greeting response\n");
1009                goto bail;
1010        }
1011        parse_response_code(ctx, NULL, rsp);
1012        if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1013                goto bail;
1014
1015        if (!preauth) {
1016#ifndef NO_OPENSSL
1017                if (!srvc->use_ssl && CAP(STARTTLS)) {
1018                        if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1019                                goto bail;
1020                        if (ssl_socket_connect(&imap->buf.sock, 1,
1021                                               srvc->ssl_verify))
1022                                goto bail;
1023                        /* capabilities may have changed, so get the new capabilities */
1024                        if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1025                                goto bail;
1026                }
1027#endif
1028                imap_info("Logging in...\n");
1029                if (!srvc->user) {
1030                        fprintf(stderr, "Skipping server %s, no user\n", srvc->host);
1031                        goto bail;
1032                }
1033                if (!srvc->pass) {
1034                        struct strbuf prompt = STRBUF_INIT;
1035                        strbuf_addf(&prompt, "Password (%s@%s): ", srvc->user, srvc->host);
1036                        arg = git_getpass(prompt.buf);
1037                        strbuf_release(&prompt);
1038                        if (!*arg) {
1039                                fprintf(stderr, "Skipping account %s@%s, no password\n", srvc->user, srvc->host);
1040                                goto bail;
1041                        }
1042                        /*
1043                         * getpass() returns a pointer to a static buffer.  make a copy
1044                         * for long term storage.
1045                         */
1046                        srvc->pass = xstrdup(arg);
1047                }
1048                if (CAP(NOLOGIN)) {
1049                        fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n", srvc->user, srvc->host);
1050                        goto bail;
1051                }
1052
1053                if (srvc->auth_method) {
1054                        struct imap_cmd_cb cb;
1055
1056                        if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1057                                if (!CAP(AUTH_CRAM_MD5)) {
1058                                        fprintf(stderr, "You specified"
1059                                                "CRAM-MD5 as authentication method, "
1060                                                "but %s doesn't support it.\n", srvc->host);
1061                                        goto bail;
1062                                }
1063                                /* CRAM-MD5 */
1064
1065                                memset(&cb, 0, sizeof(cb));
1066                                cb.cont = auth_cram_md5;
1067                                if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
1068                                        fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
1069                                        goto bail;
1070                                }
1071                        } else {
1072                                fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
1073                                goto bail;
1074                        }
1075                } else {
1076                        if (!imap->buf.sock.ssl)
1077                                imap_warn("*** IMAP Warning *** Password is being "
1078                                          "sent in the clear\n");
1079                        if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1080                                fprintf(stderr, "IMAP error: LOGIN failed\n");
1081                                goto bail;
1082                        }
1083                }
1084        } /* !preauth */
1085
1086        ctx->prefix = "";
1087        return ctx;
1088
1089bail:
1090        imap_close_store(ctx);
1091        return NULL;
1092}
1093
1094/*
1095 * Insert CR characters as necessary in *msg to ensure that every LF
1096 * character in *msg is preceded by a CR.
1097 */
1098static void lf_to_crlf(struct strbuf *msg)
1099{
1100        char *new;
1101        size_t i, j;
1102        char lastc;
1103
1104        /* First pass: tally, in j, the size of the new string: */
1105        for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1106                if (msg->buf[i] == '\n' && lastc != '\r')
1107                        j++; /* a CR will need to be added here */
1108                lastc = msg->buf[i];
1109                j++;
1110        }
1111
1112        new = xmalloc(j + 1);
1113
1114        /*
1115         * Second pass: write the new string.  Note that this loop is
1116         * otherwise identical to the first pass.
1117         */
1118        for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1119                if (msg->buf[i] == '\n' && lastc != '\r')
1120                        new[j++] = '\r';
1121                lastc = new[j++] = msg->buf[i];
1122        }
1123        strbuf_attach(msg, new, j, j + 1);
1124}
1125
1126/*
1127 * Store msg to IMAP.  Also detach and free the data from msg->data,
1128 * leaving msg->data empty.
1129 */
1130static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1131{
1132        struct imap *imap = ctx->imap;
1133        struct imap_cmd_cb cb;
1134        const char *prefix, *box;
1135        int ret;
1136
1137        lf_to_crlf(msg);
1138        memset(&cb, 0, sizeof(cb));
1139
1140        cb.dlen = msg->len;
1141        cb.data = strbuf_detach(msg, NULL);
1142
1143        box = ctx->name;
1144        prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1145        cb.create = 0;
1146        ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1147        imap->caps = imap->rcaps;
1148        if (ret != DRV_OK)
1149                return ret;
1150
1151        return DRV_OK;
1152}
1153
1154static void wrap_in_html(struct strbuf *msg)
1155{
1156        struct strbuf buf = STRBUF_INIT;
1157        static char *content_type = "Content-Type: text/html;\n";
1158        static char *pre_open = "<pre>\n";
1159        static char *pre_close = "</pre>\n";
1160        const char *body = strstr(msg->buf, "\n\n");
1161
1162        if (!body)
1163                return; /* Headers but no body; no wrapping needed */
1164
1165        body += 2;
1166
1167        strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1168        strbuf_addstr(&buf, content_type);
1169        strbuf_addch(&buf, '\n');
1170        strbuf_addstr(&buf, pre_open);
1171        strbuf_addstr_xml_quoted(&buf, body);
1172        strbuf_addstr(&buf, pre_close);
1173
1174        strbuf_release(msg);
1175        *msg = buf;
1176}
1177
1178#define CHUNKSIZE 0x1000
1179
1180static int read_message(FILE *f, struct strbuf *all_msgs)
1181{
1182        do {
1183                if (strbuf_fread(all_msgs, CHUNKSIZE, f) <= 0)
1184                        break;
1185        } while (!feof(f));
1186
1187        return ferror(f) ? -1 : 0;
1188}
1189
1190static int count_messages(struct strbuf *all_msgs)
1191{
1192        int count = 0;
1193        char *p = all_msgs->buf;
1194
1195        while (1) {
1196                if (!prefixcmp(p, "From ")) {
1197                        p = strstr(p+5, "\nFrom: ");
1198                        if (!p) break;
1199                        p = strstr(p+7, "\nDate: ");
1200                        if (!p) break;
1201                        p = strstr(p+7, "\nSubject: ");
1202                        if (!p) break;
1203                        p += 10;
1204                        count++;
1205                }
1206                p = strstr(p+5, "\nFrom ");
1207                if (!p)
1208                        break;
1209                p++;
1210        }
1211        return count;
1212}
1213
1214/*
1215 * Copy the next message from all_msgs, starting at offset *ofs, to
1216 * msg.  Update *ofs to the start of the following message.  Return
1217 * true iff a message was successfully copied.
1218 */
1219static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1220{
1221        char *p, *data;
1222        size_t len;
1223
1224        if (*ofs >= all_msgs->len)
1225                return 0;
1226
1227        data = &all_msgs->buf[*ofs];
1228        len = all_msgs->len - *ofs;
1229
1230        if (len < 5 || prefixcmp(data, "From "))
1231                return 0;
1232
1233        p = strchr(data, '\n');
1234        if (p) {
1235                p++;
1236                len -= p - data;
1237                *ofs += p - data;
1238                data = p;
1239        }
1240
1241        p = strstr(data, "\nFrom ");
1242        if (p)
1243                len = &p[1] - data;
1244
1245        strbuf_add(msg, data, len);
1246        *ofs += len;
1247        return 1;
1248}
1249
1250static char *imap_folder;
1251
1252static int git_imap_config(const char *key, const char *val, void *cb)
1253{
1254        char imap_key[] = "imap.";
1255
1256        if (strncmp(key, imap_key, sizeof imap_key - 1))
1257                return 0;
1258
1259        key += sizeof imap_key - 1;
1260
1261        /* check booleans first, and barf on others */
1262        if (!strcmp("sslverify", key))
1263                server.ssl_verify = git_config_bool(key, val);
1264        else if (!strcmp("preformattedhtml", key))
1265                server.use_html = git_config_bool(key, val);
1266        else if (!val)
1267                return config_error_nonbool(key);
1268
1269        if (!strcmp("folder", key)) {
1270                imap_folder = xstrdup(val);
1271        } else if (!strcmp("host", key)) {
1272                if (!prefixcmp(val, "imap:"))
1273                        val += 5;
1274                else if (!prefixcmp(val, "imaps:")) {
1275                        val += 6;
1276                        server.use_ssl = 1;
1277                }
1278                if (!prefixcmp(val, "//"))
1279                        val += 2;
1280                server.host = xstrdup(val);
1281        } else if (!strcmp("user", key))
1282                server.user = xstrdup(val);
1283        else if (!strcmp("pass", key))
1284                server.pass = xstrdup(val);
1285        else if (!strcmp("port", key))
1286                server.port = git_config_int(key, val);
1287        else if (!strcmp("tunnel", key))
1288                server.tunnel = xstrdup(val);
1289        else if (!strcmp("authmethod", key))
1290                server.auth_method = xstrdup(val);
1291
1292        return 0;
1293}
1294
1295int main(int argc, char **argv)
1296{
1297        struct strbuf all_msgs = STRBUF_INIT;
1298        struct strbuf msg = STRBUF_INIT;
1299        struct imap_store *ctx = NULL;
1300        int ofs = 0;
1301        int r;
1302        int total, n = 0;
1303        int nongit_ok;
1304
1305        git_extract_argv0_path(argv[0]);
1306
1307        git_setup_gettext();
1308
1309        if (argc != 1)
1310                usage(imap_send_usage);
1311
1312        setup_git_directory_gently(&nongit_ok);
1313        git_config(git_imap_config, NULL);
1314
1315        if (!server.port)
1316                server.port = server.use_ssl ? 993 : 143;
1317
1318        if (!imap_folder) {
1319                fprintf(stderr, "no imap store specified\n");
1320                return 1;
1321        }
1322        if (!server.host) {
1323                if (!server.tunnel) {
1324                        fprintf(stderr, "no imap host specified\n");
1325                        return 1;
1326                }
1327                server.host = "tunnel";
1328        }
1329
1330        /* read the messages */
1331        if (read_message(stdin, &all_msgs)) {
1332                fprintf(stderr, "error reading input\n");
1333                return 1;
1334        }
1335
1336        if (all_msgs.len == 0) {
1337                fprintf(stderr, "nothing to send\n");
1338                return 1;
1339        }
1340
1341        total = count_messages(&all_msgs);
1342        if (!total) {
1343                fprintf(stderr, "no messages to send\n");
1344                return 1;
1345        }
1346
1347        /* write it to the imap server */
1348        ctx = imap_open_store(&server);
1349        if (!ctx) {
1350                fprintf(stderr, "failed to open store\n");
1351                return 1;
1352        }
1353
1354        fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1355        ctx->name = imap_folder;
1356        while (1) {
1357                unsigned percent = n * 100 / total;
1358
1359                fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1360                if (!split_msg(&all_msgs, &msg, &ofs))
1361                        break;
1362                if (server.use_html)
1363                        wrap_in_html(&msg);
1364                r = imap_store_msg(ctx, &msg);
1365                if (r != DRV_OK)
1366                        break;
1367                n++;
1368        }
1369        fprintf(stderr, "\n");
1370
1371        imap_close_store(ctx);
1372
1373        return 0;
1374}